* SQLiteDatabase has methods to create, delete, execute SQL commands, and * perform other common database management tasks. *
* See the Notepad sample application in the SDK for an example of creating * and managing a database. *
* Database names must be unique within an application, not across all applications. *
* *
* In addition to SQLite's default BINARY collator, Android supplies
* two more, LOCALIZED, which changes with the system's current locale,
* and UNICODE, which is the Unicode Collation Algorithm and not tailored
* to the current locale.
*
LOCALIZED not to be created.
* You must be consistent when using this flag to use the setting the database was
* created with. If this is set, {@link #setLocale} will do nothing.
*/
public static final int NO_LOCALIZED_COLLATORS = 0x00000010; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to create the database file if it does not
* already exist.
*/
public static final int CREATE_IF_NECESSARY = 0x10000000; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to open the database file with
* write-ahead logging enabled by default. Using this flag is more efficient
* than calling {@link #enableWriteAheadLogging}.
*
* Write-ahead logging cannot be used with read-only databases so the value of
* this flag is ignored if the database is opened read-only.
*
* @see #enableWriteAheadLogging
*/
public static final int ENABLE_WRITE_AHEAD_LOGGING = 0x20000000;
// Note: The below value was only used on Android Pie.
// public static final int DISABLE_COMPATIBILITY_WAL = 0x40000000;
/**
* Open flag: Flag for {@link #openDatabase} to enable the legacy Compatibility WAL when opening
* database.
*
* @hide
*/
public static final int ENABLE_LEGACY_COMPATIBILITY_WAL = 0x80000000;
/**
* Absolute max value that can be set by {@link #setMaxSqlCacheSize(int)}.
*
* Each prepared-statement is between 1K - 6K, depending on the complexity of the
* SQL statement & schema. A large SQL cache may use a significant amount of memory.
*/
public static final int MAX_SQL_CACHE_SIZE = 100;
/**
* @hide
*/
@StringDef(prefix = {"JOURNAL_MODE_"},
value =
{
JOURNAL_MODE_WAL,
JOURNAL_MODE_PERSIST,
JOURNAL_MODE_TRUNCATE,
JOURNAL_MODE_MEMORY,
JOURNAL_MODE_DELETE,
JOURNAL_MODE_OFF,
})
@Retention(RetentionPolicy.SOURCE)
public @interface JournalMode {}
/**
* The {@code WAL} journaling mode uses a write-ahead log instead of a rollback journal to
* implement transactions. The WAL journaling mode is persistent; after being set it stays
* in effect across multiple database connections and after closing and reopening the database.
*
* Performance Considerations:
* This mode is recommended when the goal is to improve write performance or parallel read/write
* performance. However, it is important to note that WAL introduces checkpoints which commit
* all transactions that have not been synced to the database thus to maximize read performance
* and lower checkpointing cost a small journal size is recommended. However, other modes such
* as {@code DELETE} will not perform checkpoints, so it is a trade off that needs to be
* considered as part of the decision of which journal mode to use.
*
* See here for more * details.
*/ public static final String JOURNAL_MODE_WAL = "WAL"; /** * The {@code PERSIST} journaling mode prevents the rollback journal from being deleted at the * end of each transaction. Instead, the header of the journal is overwritten with zeros. * This will prevent other database connections from rolling the journal back. * * This mode is useful as an optimization on platforms where deleting or truncating a file is * much more expensive than overwriting the first block of a file with zeros. * *See here for more * details.
*/ public static final String JOURNAL_MODE_PERSIST = "PERSIST"; /** * The {@code TRUNCATE} journaling mode commits transactions by truncating the rollback journal * to zero-length instead of deleting it. On many systems, truncating a file is much faster than * deleting the file since the containing directory does not need to be changed. * *See here for more * details.
*/ public static final String JOURNAL_MODE_TRUNCATE = "TRUNCATE"; /** * The {@code MEMORY} journaling mode stores the rollback journal in volatile RAM. * This saves disk I/O but at the expense of database safety and integrity. If the application * using SQLite crashes in the middle of a transaction when the MEMORY journaling mode is set, * then the database file will very likely go corrupt. * *See here for more * details.
*/ public static final String JOURNAL_MODE_MEMORY = "MEMORY"; /** * The {@code DELETE} journaling mode is the normal behavior. In the DELETE mode, the rollback * journal is deleted at the conclusion of each transaction. * *See here for more * details.
*/ public static final String JOURNAL_MODE_DELETE = "DELETE"; /** * The {@code OFF} journaling mode disables the rollback journal completely. No rollback journal * is ever created and hence there is never a rollback journal to delete. The OFF journaling * mode disables the atomic commit and rollback capabilities of SQLite. The ROLLBACK command * behaves in an undefined way thus applications must avoid using the ROLLBACK command. * If the application crashes in the middle of a transaction, then the database file will very * likely go corrupt. * *See here for more * details.
*/ public static final String JOURNAL_MODE_OFF = "OFF"; /** * @hide */ @StringDef(prefix = {"SYNC_MODE_"}, value = { SYNC_MODE_EXTRA, SYNC_MODE_FULL, SYNC_MODE_NORMAL, SYNC_MODE_OFF, }) @Retention(RetentionPolicy.SOURCE) public @interface SyncMode {} /** * The {@code EXTRA} sync mode is like {@code FULL} sync mode with the addition that the * directory containing a rollback journal is synced after that journal is unlinked to commit a * transaction in {@code DELETE} journal mode. * * {@code EXTRA} provides additional durability if the commit is followed closely by a * power loss. * *See here for more * details.
*/ @SuppressLint("IntentName") public static final String SYNC_MODE_EXTRA = "EXTRA"; /** * In {@code FULL} sync mode the SQLite database engine will use the xSync method of the VFS * to ensure that all content is safely written to the disk surface prior to continuing. * This ensures that an operating system crash or power failure will not corrupt the database. * {@code FULL} is very safe, but it is also slower. * * {@code FULL} is the most commonly used synchronous setting when not in WAL mode. * *See here for more * details.
*/ public static final String SYNC_MODE_FULL = "FULL"; /** * The {@code NORMAL} sync mode, the SQLite database engine will still sync at the most critical * moments, but less often than in {@code FULL} mode. There is a very small chance that a * power failure at the wrong time could corrupt the database in {@code DELETE} journal mode on * an older filesystem. * * {@code WAL} journal mode is safe from corruption with {@code NORMAL} sync mode, and probably * {@code DELETE} sync mode is safe too on modern filesystems. WAL mode is always consistent * with {@code NORMAL} sync mode, but WAL mode does lose durability. A transaction committed in * WAL mode with {@code NORMAL} might roll back following a power loss or system crash. * Transactions are durable across application crashes regardless of the synchronous setting * or journal mode. * * The {@code NORMAL} sync mode is a good choice for most applications running in WAL mode. * *Caveat: Even though this sync mode is safe Be careful when using {@code NORMAL} sync mode * when dealing with data dependencies between multiple databases, unless those databases use * the same durability or are somehow synced, there could be corruption.
* *See here for more * details.
*/ public static final String SYNC_MODE_NORMAL = "NORMAL"; /** * In {@code OFF} sync mode SQLite continues without syncing as soon as it has handed data off * to the operating system. If the application running SQLite crashes, the data will be safe, * but the database might become corrupted if the operating system crashes or the computer loses * power before that data has been written to the disk surface. On the other hand, commits can * be orders of magnitude faster with synchronous {@code OFF}. * *See here for more * details.
*/ public static final String SYNC_MODE_OFF = "OFF"; private SQLiteDatabase(@Nullable final String path, @Nullable final int openFlags, @Nullable CursorFactory cursorFactory, @Nullable DatabaseErrorHandler errorHandler, int lookasideSlotSize, int lookasideSlotCount, long idleConnectionTimeoutMs, @Nullable String journalMode, @Nullable String syncMode) { mCursorFactory = cursorFactory; mErrorHandler = errorHandler != null ? errorHandler : new DefaultDatabaseErrorHandler(); mConfigurationLocked = new SQLiteDatabaseConfiguration(path, openFlags); mConfigurationLocked.lookasideSlotSize = lookasideSlotSize; mConfigurationLocked.lookasideSlotCount = lookasideSlotCount; // Disable lookaside allocator on low-RAM devices if (ActivityManager.isLowRamDeviceStatic()) { mConfigurationLocked.lookasideSlotCount = 0; mConfigurationLocked.lookasideSlotSize = 0; } long effectiveTimeoutMs = Long.MAX_VALUE; // Never close idle connections for in-memory databases if (!mConfigurationLocked.isInMemoryDb()) { // First, check app-specific value. Otherwise use defaults // -1 in idleConnectionTimeoutMs indicates unset value if (idleConnectionTimeoutMs >= 0) { effectiveTimeoutMs = idleConnectionTimeoutMs; } else if (DEBUG_CLOSE_IDLE_CONNECTIONS) { effectiveTimeoutMs = SQLiteGlobal.getIdleConnectionTimeout(); } } mConfigurationLocked.idleConnectionTimeoutMs = effectiveTimeoutMs; if (SQLiteCompatibilityWalFlags.isLegacyCompatibilityWalEnabled()) { mConfigurationLocked.openFlags |= ENABLE_LEGACY_COMPATIBILITY_WAL; } mConfigurationLocked.journalMode = journalMode; mConfigurationLocked.syncMode = syncMode; } @Override protected void finalize() throws Throwable { try { dispose(true); } finally { super.finalize(); } } @Override protected void onAllReferencesReleased() { dispose(false); } private void dispose(boolean finalized) { final SQLiteConnectionPool pool; synchronized (mLock) { if (mCloseGuardLocked != null) { if (finalized) { mCloseGuardLocked.warnIfOpen(); } mCloseGuardLocked.close(); } pool = mConnectionPoolLocked; mConnectionPoolLocked = null; } if (!finalized) { synchronized (sActiveDatabases) { sActiveDatabases.remove(this); } if (pool != null) { pool.close(); } } } /** * Attempts to release memory that SQLite holds but does not require to * operate properly. Typically this memory will come from the page cache. * * @return the number of bytes actually released */ public static int releaseMemory() { return SQLiteGlobal.releaseMemory(); } /** * Control whether or not the SQLiteDatabase is made thread-safe by using locks * around critical sections. This is pretty expensive, so if you know that your * DB will only be used by a single thread then you should set this to false. * The default is true. * @param lockingEnabled set to true to enable locks, false otherwise * * @deprecated This method now does nothing. Do not use. */ @Deprecated public void setLockingEnabled(boolean lockingEnabled) { } /** * Gets a label to use when describing the database in log messages. * @return The label. */ String getLabel() { synchronized (mLock) { return mConfigurationLocked.label; } } /** * Sends a corruption message to the database error handler. */ void onCorruption() { EventLog.writeEvent(EVENT_DB_CORRUPT, getLabel()); mErrorHandler.onCorruption(this); } /** * Gets the {@link SQLiteSession} that belongs to this thread for this database. * Once a thread has obtained a session, it will continue to obtain the same * session even after the database has been closed (although the session will not * be usable). However, a thread that does not already have a session cannot * obtain one after the database has been closed. * * The idea is that threads that have active connections to the database may still * have work to complete even after the call to {@link #close}. Active database * connections are not actually disposed until they are released by the threads * that own them. * * @return The session, never null. * * @throws IllegalStateException if the thread does not yet have a session and * the database is not open. */ @UnsupportedAppUsage SQLiteSession getThreadSession() { return mThreadSession.get(); // initialValue() throws if database closed } SQLiteSession createSession() { final SQLiteConnectionPool pool; synchronized (mLock) { throwIfNotOpenLocked(); pool = mConnectionPoolLocked; } return new SQLiteSession(pool); } /** * Gets default connection flags that are appropriate for this thread, taking into * account whether the thread is acting on behalf of the UI. * * @param readOnly True if the connection should be read-only. * @return The connection flags. */ int getThreadDefaultConnectionFlags(boolean readOnly) { int flags = readOnly ? SQLiteConnectionPool.CONNECTION_FLAG_READ_ONLY : SQLiteConnectionPool.CONNECTION_FLAG_PRIMARY_CONNECTION_AFFINITY; if (isMainThread()) { flags |= SQLiteConnectionPool.CONNECTION_FLAG_INTERACTIVE; } return flags; } private static boolean isMainThread() { // FIXME: There should be a better way to do this. // Would also be nice to have something that would work across Binder calls. Looper looper = Looper.myLooper(); return looper != null && looper == Looper.getMainLooper(); } /** * Begins a transaction in EXCLUSIVE mode. ** Transactions can be nested. * When the outer transaction is ended all of * the work done in that transaction and all of the nested transactions will be committed or * rolled back. The changes will be rolled back if any transaction is ended without being * marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed. *
*Here is the standard idiom for transactions: * *
* db.beginTransaction();
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*/
public void beginTransaction() {
beginTransaction(null /* transactionStatusCallback */, true);
}
/**
* Begins a transaction in IMMEDIATE mode. Transactions can be nested. When
* the outer transaction is ended all of the work done in that transaction
* and all of the nested transactions will be committed or rolled back. The
* changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they
* will be committed.
* * Here is the standard idiom for transactions: * *
* db.beginTransactionNonExclusive();
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*/
public void beginTransactionNonExclusive() {
beginTransaction(null /* transactionStatusCallback */, false);
}
/**
* Begins a transaction in DEFERRED mode, with the android-specific constraint that the
* transaction is read-only. The database may not be modified inside a read-only transaction.
* * Read-only transactions may run concurrently with other read-only transactions, and if the * database is in WAL mode, they may also run concurrently with IMMEDIATE or EXCLUSIVE * transactions. *
* Transactions can be nested. However, the behavior of the transaction is not altered by * nested transactions. A nested transaction may be any of the three transaction types but if * the outermost type is read-only then nested transactions remain read-only, regardless of how * they are started. *
* Here is the standard idiom for read-only transactions: * *
* db.beginTransactionReadOnly();
* try {
* ...
* } finally {
* db.endTransaction();
* }
*
*/
@FlaggedApi(Flags.FLAG_SQLITE_APIS_35)
public void beginTransactionReadOnly() {
beginTransactionWithListenerReadOnly(null);
}
/**
* Begins a transaction in EXCLUSIVE mode.
* * Transactions can be nested. * When the outer transaction is ended all of * the work done in that transaction and all of the nested transactions will be committed or * rolled back. The changes will be rolled back if any transaction is ended without being * marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed. *
*Here is the standard idiom for transactions: * *
* db.beginTransactionWithListener(listener);
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*
* @param transactionListener listener that should be notified when the transaction begins,
* commits, or is rolled back, either explicitly or by a call to
* {@link #yieldIfContendedSafely}.
*/
public void beginTransactionWithListener(
@Nullable SQLiteTransactionListener transactionListener) {
beginTransaction(transactionListener, true);
}
/**
* Begins a transaction in IMMEDIATE mode. Transactions can be nested. When
* the outer transaction is ended all of the work done in that transaction
* and all of the nested transactions will be committed or rolled back. The
* changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they
* will be committed.
* * Here is the standard idiom for transactions: * *
* db.beginTransactionWithListenerNonExclusive(listener);
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*
* @param transactionListener listener that should be notified when the
* transaction begins, commits, or is rolled back, either
* explicitly or by a call to {@link #yieldIfContendedSafely}.
*/
public void beginTransactionWithListenerNonExclusive(
@Nullable SQLiteTransactionListener transactionListener) {
beginTransaction(transactionListener, false);
}
/**
* Begins a transaction in read-only mode with a {@link SQLiteTransactionListener} listener.
* The database may not be updated inside a read-only transaction.
* * Transactions can be nested. However, the behavior of the transaction is not altered by * nested transactions. A nested transaction may be any of the three transaction types but if * the outermost type is read-only then nested transactions remain read-only, regardless of how * they are started. *
* Here is the standard idiom for read-only transactions: * *
* db.beginTransactionWightListenerReadOnly(listener);
* try {
* ...
* } finally {
* db.endTransaction();
* }
*
*/
@FlaggedApi(Flags.FLAG_SQLITE_APIS_35)
public void beginTransactionWithListenerReadOnly(
@Nullable SQLiteTransactionListener transactionListener) {
beginTransaction(transactionListener, SQLiteSession.TRANSACTION_MODE_DEFERRED);
}
@UnsupportedAppUsage
private void beginTransaction(SQLiteTransactionListener transactionListener,
boolean exclusive) {
beginTransaction(transactionListener,
exclusive ? SQLiteSession.TRANSACTION_MODE_EXCLUSIVE :
SQLiteSession.TRANSACTION_MODE_IMMEDIATE);
}
/**
* Begin a transaction with the specified mode. Valid modes are
* {@link SQLiteSession.TRANSACTION_MODE_DEFERRED},
* {@link SQLiteSession.TRANSACTION_MODE_IMMEDIATE}, and
* {@link SQLiteSession.TRANSACTION_MODE_EXCLUSIVE}.
*/
private void beginTransaction(@Nullable SQLiteTransactionListener listener, int mode) {
acquireReference();
try {
// DEFERRED transactions are read-only to allows concurrent read-only transactions.
// Others are read/write.
boolean readOnly = (mode == SQLiteSession.TRANSACTION_MODE_DEFERRED);
getThreadSession().beginTransaction(mode, listener,
getThreadDefaultConnectionFlags(readOnly), null);
} finally {
releaseReference();
}
}
/**
* End a transaction. See beginTransaction for notes about how to use this and when transactions
* are committed and rolled back.
*/
public void endTransaction() {
acquireReference();
try {
getThreadSession().endTransaction(null);
} finally {
releaseReference();
}
}
/**
* Marks the current transaction as successful. Do not do any more database work between
* calling this and calling endTransaction. Do as little non-database work as possible in that
* situation too. If any errors are encountered between this and endTransaction the transaction
* will still be committed.
*
* @throws IllegalStateException if the current thread is not in a transaction or the
* transaction is already marked as successful.
*/
public void setTransactionSuccessful() {
acquireReference();
try {
getThreadSession().setTransactionSuccessful();
} finally {
releaseReference();
}
}
/**
* Returns true if the current thread has a transaction pending.
*
* @return True if the current thread is in a transaction.
*/
public boolean inTransaction() {
acquireReference();
try {
return getThreadSession().hasTransaction();
} finally {
releaseReference();
}
}
/**
* Returns true if the current thread is holding an active connection to the database.
* * The name of this method comes from a time when having an active connection * to the database meant that the thread was holding an actual lock on the * database. Nowadays, there is no longer a true "database lock" although threads * may block if they cannot acquire a database connection to perform a * particular operation. *
* * @return True if the current thread is holding an active connection to the database. */ public boolean isDbLockedByCurrentThread() { acquireReference(); try { return getThreadSession().hasConnection(); } finally { releaseReference(); } } /** * Always returns false. ** There is no longer the concept of a database lock, so this method always returns false. *
* * @return False. * @deprecated Always returns false. Do not use this method. */ @Deprecated public boolean isDbLockedByOtherThreads() { return false; } /** * Temporarily end the transaction to let other threads run. The transaction is assumed to be * successful so far. Do not call setTransactionSuccessful before calling this. When this * returns a new transaction will have been created but not marked as successful. * @return true if the transaction was yielded * @deprecated if the db is locked more than once (because of nested transactions) then the lock * will not be yielded. Use yieldIfContendedSafely instead. */ @Deprecated public boolean yieldIfContended() { return yieldIfContendedHelper(false /* do not check yielding */, -1 /* sleepAfterYieldDelay */); } /** * Temporarily end the transaction to let other threads run. The transaction is assumed to be * successful so far. Do not call setTransactionSuccessful before calling this. When this * returns a new transaction will have been created but not marked as successful. This assumes * that there are no nested transactions (beginTransaction has only been called once) and will * throw an exception if that is not the case. * @return true if the transaction was yielded */ public boolean yieldIfContendedSafely() { return yieldIfContendedHelper(true /* check yielding */, -1 /* sleepAfterYieldDelay*/); } /** * Temporarily end the transaction to let other threads run. The transaction is assumed to be * successful so far. Do not call setTransactionSuccessful before calling this. When this * returns a new transaction will have been created but not marked as successful. This assumes * that there are no nested transactions (beginTransaction has only been called once) and will * throw an exception if that is not the case. * @param sleepAfterYieldDelay if > 0, sleep this long before starting a new transaction if * the lock was actually yielded. This will allow other background threads to make some * more progress than they would if we started the transaction immediately. * @return true if the transaction was yielded */ public boolean yieldIfContendedSafely(long sleepAfterYieldDelay) { return yieldIfContendedHelper(true /* check yielding */, sleepAfterYieldDelay); } private boolean yieldIfContendedHelper(boolean throwIfUnsafe, long sleepAfterYieldDelay) { acquireReference(); try { return getThreadSession().yieldTransaction(sleepAfterYieldDelay, throwIfUnsafe, null); } finally { releaseReference(); } } /** * Deprecated. * @deprecated This method no longer serves any useful purpose and has been deprecated. */ @Deprecated public MapSets the locale of the database to the system's current locale. * Call {@link #setLocale} if you would like something else.
* * @param path to database file to open and/or create * @param factory an optional factory class that is called to instantiate a * cursor when query is called, or null for default * @param flags to control database access mode * @return the newly opened database * @throws SQLiteException if the database cannot be opened */ public static SQLiteDatabase openDatabase(@NonNull String path, @Nullable CursorFactory factory, @DatabaseOpenFlags int flags) { return openDatabase(path, factory, flags, null); } /** * Open the database according to the specified {@link OpenParams parameters} * * @param path path to database file to open and/or create. *Important: The file should be constructed either from an absolute path or * by using {@link android.content.Context#getDatabasePath(String)}. * @param openParams configuration parameters that are used for opening {@link SQLiteDatabase} * @return the newly opened database * @throws SQLiteException if the database cannot be opened */ public static SQLiteDatabase openDatabase(@NonNull File path, @NonNull OpenParams openParams) { return openDatabase(path.getPath(), openParams); } @UnsupportedAppUsage private static SQLiteDatabase openDatabase(@NonNull String path, @NonNull OpenParams openParams) { Preconditions.checkArgument(openParams != null, "OpenParams cannot be null"); SQLiteDatabase db = new SQLiteDatabase(path, openParams.mOpenFlags, openParams.mCursorFactory, openParams.mErrorHandler, openParams.mLookasideSlotSize, openParams.mLookasideSlotCount, openParams.mIdleConnectionTimeout, openParams.mJournalMode, openParams.mSyncMode); db.open(); return db; } /** * Open the database according to the flags {@link #OPEN_READWRITE} * {@link #OPEN_READONLY} {@link #CREATE_IF_NECESSARY} and/or {@link #NO_LOCALIZED_COLLATORS}. * *
Sets the locale of the database to the system's current locale. * Call {@link #setLocale} if you would like something else.
* *Accepts input param: a concrete instance of {@link DatabaseErrorHandler} to be * used to handle corruption when sqlite reports database corruption.
* * @param path to database file to open and/or create * @param factory an optional factory class that is called to instantiate a * cursor when query is called, or null for default * @param flags to control database access mode * @param errorHandler the {@link DatabaseErrorHandler} obj to be used to handle corruption * when sqlite reports database corruption * @return the newly opened database * @throws SQLiteException if the database cannot be opened */ public static SQLiteDatabase openDatabase(@NonNull String path, @Nullable CursorFactory factory, @DatabaseOpenFlags int flags, @Nullable DatabaseErrorHandler errorHandler) { SQLiteDatabase db = new SQLiteDatabase(path, flags, factory, errorHandler, -1, -1, -1, null, null); db.open(); return db; } /** * Equivalent to openDatabase(file.getPath(), factory, CREATE_IF_NECESSARY). */ public static SQLiteDatabase openOrCreateDatabase(@NonNull File file, @Nullable CursorFactory factory) { return openOrCreateDatabase(file.getPath(), factory); } /** * Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY). */ public static SQLiteDatabase openOrCreateDatabase(@NonNull String path, @Nullable CursorFactory factory) { return openDatabase(path, factory, CREATE_IF_NECESSARY, null); } /** * Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler). */ public static SQLiteDatabase openOrCreateDatabase(@NonNull String path, @Nullable CursorFactory factory, @Nullable DatabaseErrorHandler errorHandler) { return openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler); } /** * Deletes a database including its journal file and other auxiliary files * that may have been created by the database engine. * * @param file The database file path. * @return True if the database was successfully deleted. */ public static boolean deleteDatabase(@NonNull File file) { return deleteDatabase(file, /*removeCheckFile=*/ true); } /** @hide */ public static boolean deleteDatabase(@NonNull File file, boolean removeCheckFile) { if (file == null) { throw new IllegalArgumentException("file must not be null"); } boolean deleted = false; deleted |= file.delete(); deleted |= new File(file.getPath() + "-journal").delete(); deleted |= new File(file.getPath() + "-shm").delete(); deleted |= new File(file.getPath() + "-wal").delete(); // This file is not a standard SQLite file, so don't update the deleted flag. new File(file.getPath() + SQLiteGlobal.WIPE_CHECK_FILE_SUFFIX).delete(); File dir = file.getParentFile(); if (dir != null) { final String prefix = file.getName() + "-mj"; File[] files = dir.listFiles(new FileFilter() { @Override public boolean accept(File candidate) { return candidate.getName().startsWith(prefix); } }); if (files != null) { for (File masterJournal : files) { deleted |= masterJournal.delete(); } } } return deleted; } /** * Reopens the database in read-write mode. * If the database is already read-write, does nothing. * * @throws SQLiteException if the database could not be reopened as requested, in which * case it remains open in read only mode. * @throws IllegalStateException if the database is not open. * * @see #isReadOnly() * @hide */ @UnsupportedAppUsage public void reopenReadWrite() { synchronized (mLock) { throwIfNotOpenLocked(); if (!isReadOnlyLocked()) { return; // nothing to do } // Reopen the database in read-write mode. final int oldOpenFlags = mConfigurationLocked.openFlags; mConfigurationLocked.openFlags = (mConfigurationLocked.openFlags & ~OPEN_READ_MASK) | OPEN_READWRITE; try { mConnectionPoolLocked.reconfigure(mConfigurationLocked); } catch (RuntimeException ex) { mConfigurationLocked.openFlags = oldOpenFlags; throw ex; } } } private void open() { try { try { openInner(); } catch (RuntimeException ex) { if (SQLiteDatabaseCorruptException.isCorruptException(ex)) { Log.e(TAG, "Database corruption detected in open()", ex); onCorruption(); openInner(); } else { throw ex; } } } catch (SQLiteException ex) { Log.e(TAG, "Failed to open database '" + getLabel() + "'.", ex); close(); throw ex; } } private void openInner() { synchronized (mLock) { assert mConnectionPoolLocked == null; mConnectionPoolLocked = SQLiteConnectionPool.open(mConfigurationLocked); mCloseGuardLocked.open("close"); } synchronized (sActiveDatabases) { sActiveDatabases.put(this, null); } } /** * Create a memory backed SQLite database. Its contents will be destroyed * when the database is closed. * *Sets the locale of the database to the system's current locale. * Call {@link #setLocale} if you would like something else.
* * @param factory an optional factory class that is called to instantiate a * cursor when query is called * @return a SQLiteDatabase instance * @throws SQLiteException if the database cannot be created */ @NonNull public static SQLiteDatabase create(@Nullable CursorFactory factory) { // This is a magic string with special meaning for SQLite. return openDatabase(SQLiteDatabaseConfiguration.MEMORY_DB_PATH, factory, CREATE_IF_NECESSARY); } /** * Create a memory backed SQLite database. Its contents will be destroyed * when the database is closed. * *Sets the locale of the database to the system's current locale. * Call {@link #setLocale} if you would like something else.
* @param openParams configuration parameters that are used for opening SQLiteDatabase * @return a SQLiteDatabase instance * @throws SQLException if the database cannot be created */ @NonNull public static SQLiteDatabase createInMemory(@NonNull OpenParams openParams) { return openDatabase(SQLiteDatabaseConfiguration.MEMORY_DB_PATH, openParams.toBuilder().addOpenFlags(CREATE_IF_NECESSARY).build()); } /** * Register a custom scalar function that can be called from SQL * expressions. ** For example, registering a custom scalar function named {@code REVERSE} * could be used in a query like * {@code SELECT REVERSE(name) FROM employees}. *
* When attempting to register multiple functions with the same function
* name, SQLite will replace any previously defined functions with the
* latest definition, regardless of what function type they are. SQLite does
* not support unregistering functions.
*
* @param functionName Case-insensitive name to register this function
* under, limited to 255 UTF-8 bytes in length.
* @param scalarFunction Functional interface that will be invoked when the
* function name is used by a SQL statement. The argument values
* from the SQL statement are passed to the functional interface,
* and the return values from the functional interface are
* returned back into the SQL statement.
* @throws SQLiteException if the custom function could not be registered.
* @see #setCustomAggregateFunction(String, BinaryOperator)
*/
public void setCustomScalarFunction(@NonNull String functionName,
@NonNull UnaryOperator
* For example, registering a custom aggregation function named
* {@code LONGEST} could be used in a query like
* {@code SELECT LONGEST(name) FROM employees}.
*
* The implementation of this method follows the reduction flow outlined in
* {@link java.util.stream.Stream#reduce(BinaryOperator)}, and the custom
* aggregation function is expected to be an associative accumulation
* function, as defined by that class.
*
* When attempting to register multiple functions with the same function
* name, SQLite will replace any previously defined functions with the
* latest definition, regardless of what function type they are. SQLite does
* not support unregistering functions.
*
* @param functionName Case-insensitive name to register this function
* under, limited to 255 UTF-8 bytes in length.
* @param aggregateFunction Functional interface that will be invoked when
* the function name is used by a SQL statement. The argument
* values from the SQL statement are passed to the functional
* interface, and the return values from the functional interface
* are returned back into the SQL statement.
* @throws SQLiteException if the custom function could not be registered.
* @see #setCustomScalarFunction(String, UnaryOperator)
*/
public void setCustomAggregateFunction(@NonNull String functionName,
@NonNull BinaryOperator
* This statement will be immediately executed on all existing connections,
* and will be automatically executed on all future connections.
*
* Some example usages are changes like {@code PRAGMA trusted_schema=OFF} or
* functions like {@code SELECT icu_load_collation()}. If you execute these
* statements using {@link #execSQL} then they will only apply to a single
* database connection; using this method will ensure that they are
* uniformly applied to all current and future connections.
*
* @param sql The SQL statement to be executed. Multiple statements
* separated by semicolons are not supported.
* @param bindArgs The arguments that should be bound to the SQL statement.
*/
public void execPerConnectionSQL(@NonNull String sql, @Nullable Object[] bindArgs)
throws SQLException {
Objects.requireNonNull(sql);
// Copy arguments to ensure that the caller doesn't accidentally change
// the values used by future connections
bindArgs = DatabaseUtils.deepCopyOf(bindArgs);
synchronized (mLock) {
throwIfNotOpenLocked();
final int index = mConfigurationLocked.perConnectionSql.size();
mConfigurationLocked.perConnectionSql.add(Pair.create(sql, bindArgs));
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.perConnectionSql.remove(index);
throw ex;
}
}
}
/**
* Gets the database version.
*
* @return the database version
*/
public int getVersion() {
return ((Long) DatabaseUtils.longForQuery(this, "PRAGMA user_version;", null)).intValue();
}
/**
* Sets the database version.
*
* @param version the new database version
*/
public void setVersion(int version) {
execSQL("PRAGMA user_version = " + version);
}
/**
* Returns the maximum size the database may grow to.
*
* @return the new maximum database size
*/
public long getMaximumSize() {
long pageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count;", null);
return pageCount * getPageSize();
}
/**
* Sets the maximum size the database will grow to. The maximum size cannot
* be set below the current size.
*
* @param numBytes the maximum database size, in bytes
* @return the new maximum database size
*/
public long setMaximumSize(long numBytes) {
long pageSize = getPageSize();
long numPages = numBytes / pageSize;
// If numBytes isn't a multiple of pageSize, bump up a page
if ((numBytes % pageSize) != 0) {
numPages++;
}
long newPageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count = " + numPages,
null);
return newPageCount * pageSize;
}
/**
* Returns the current database page size, in bytes.
*
* @return the database page size, in bytes
*/
public long getPageSize() {
return DatabaseUtils.longForQuery(this, "PRAGMA page_size;", null);
}
/**
* Sets the database page size. The page size must be a power of two. This
* method does not work if any data has been written to the database file,
* and must be called right after the database has been created.
*
* @param numBytes the database page size, in bytes
*/
public void setPageSize(long numBytes) {
execSQL("PRAGMA page_size = " + numBytes);
}
/**
* Mark this table as syncable. When an update occurs in this table the
* _sync_dirty field will be set to ensure proper syncing operation.
*
* @param table the table to mark as syncable
* @param deletedTable The deleted table that corresponds to the
* syncable table
* @deprecated This method no longer serves any useful purpose and has been deprecated.
*/
@Deprecated
public void markTableSyncable(String table, String deletedTable) {
}
/**
* Mark this table as syncable, with the _sync_dirty residing in another
* table. When an update occurs in this table the _sync_dirty field of the
* row in updateTable with the _id in foreignKey will be set to
* ensure proper syncing operation.
*
* @param table an update on this table will trigger a sync time removal
* @param foreignKey this is the column in table whose value is an _id in
* updateTable
* @param updateTable this is the table that will have its _sync_dirty
* @deprecated This method no longer serves any useful purpose and has been deprecated.
*/
@Deprecated
public void markTableSyncable(String table, String foreignKey, String updateTable) {
}
/**
* Finds the name of the first table, which is editable.
*
* @param tables a list of tables
* @return the first table listed
*/
public static String findEditTable(String tables) {
if (!TextUtils.isEmpty(tables)) {
// find the first word terminated by either a space or a comma
int spacepos = tables.indexOf(' ');
int commapos = tables.indexOf(',');
if (spacepos > 0 && (spacepos < commapos || commapos < 0)) {
return tables.substring(0, spacepos);
} else if (commapos > 0 && (commapos < spacepos || spacepos < 0) ) {
return tables.substring(0, commapos);
}
return tables;
} else {
throw new IllegalStateException("Invalid tables");
}
}
/**
* Compiles an SQL statement into a reusable pre-compiled statement object.
* The parameters are identical to {@link #execSQL(String)}. You may put ?s in the
* statement and fill in those values with {@link SQLiteProgram#bindString}
* and {@link SQLiteProgram#bindLong} each time you want to run the
* statement. Statements may not return result sets larger than 1x1.
*
* No two threads should be using the same {@link SQLiteStatement} at the same time.
*
* @param sql The raw SQL statement, may contain ? for unknown values to be
* bound later.
* @return A pre-compiled {@link SQLiteStatement} object. Note that
* {@link SQLiteStatement}s are not synchronized, see the documentation for more details.
*/
public SQLiteStatement compileStatement(String sql) throws SQLException {
acquireReference();
try {
return new SQLiteStatement(this, sql, null);
} finally {
releaseReference();
}
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@NonNull
public Cursor query(boolean distinct, @NonNull String table,
@Nullable String[] columns, @Nullable String selection,
@Nullable String[] selectionArgs, @Nullable String groupBy, @Nullable String having,
@Nullable String orderBy, @Nullable String limit) {
return queryWithFactory(null, distinct, table, columns, selection, selectionArgs,
groupBy, having, orderBy, limit, null);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@NonNull
public Cursor query(boolean distinct, @NonNull String table,
@Nullable String[] columns, @Nullable String selection,
@Nullable String[] selectionArgs, @Nullable String groupBy, @Nullable String having,
@Nullable String orderBy, @Nullable String limit,
@Nullable CancellationSignal cancellationSignal) {
return queryWithFactory(null, distinct, table, columns, selection, selectionArgs,
groupBy, having, orderBy, limit, cancellationSignal);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@SuppressLint("SamShouldBeLast")
@NonNull
public Cursor queryWithFactory(@Nullable CursorFactory cursorFactory,
boolean distinct, @NonNull String table, @Nullable String[] columns,
@Nullable String selection, @Nullable String[] selectionArgs, @Nullable String groupBy,
@Nullable String having, @Nullable String orderBy, @Nullable String limit) {
return queryWithFactory(cursorFactory, distinct, table, columns, selection,
selectionArgs, groupBy, having, orderBy, limit, null);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@SuppressLint("SamShouldBeLast")
@NonNull
public Cursor queryWithFactory(@Nullable CursorFactory cursorFactory,
boolean distinct, @NonNull String table, @Nullable String[] columns,
@Nullable String selection, @Nullable String[] selectionArgs, @Nullable String groupBy,
@Nullable String having, @Nullable String orderBy, @Nullable String limit,
@Nullable CancellationSignal cancellationSignal) {
acquireReference();
try {
String sql = SQLiteQueryBuilder.buildQueryString(
distinct, table, columns, selection, groupBy, having, orderBy, limit);
return rawQueryWithFactory(cursorFactory, sql, selectionArgs,
findEditTable(table), cancellationSignal);
} finally {
releaseReference();
}
}
/**
* Query the given table, returning a {@link Cursor} over the result set.
*
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@NonNull
public Cursor query(@NonNull String table, @Nullable String[] columns,
@Nullable String selection, @Nullable String[] selectionArgs, @Nullable String groupBy,
@Nullable String having, @Nullable String orderBy) {
return query(false, table, columns, selection, selectionArgs, groupBy,
having, orderBy, null /* limit */);
}
/**
* Query the given table, returning a {@link Cursor} over the result set.
*
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in the order that they
* appear in the selection. The values will be bound as Strings.
* If selection is null or does not contain ?s then selectionArgs
* may be null.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
@NonNull
public Cursor query(@NonNull String table, @Nullable String[] columns,
@Nullable String selection, @Nullable String[] selectionArgs, @Nullable String groupBy,
@Nullable String having, @Nullable String orderBy, @Nullable String limit) {
return query(false, table, columns, selection, selectionArgs, groupBy,
having, orderBy, limit);
}
/**
* Runs the provided SQL and returns a {@link Cursor} over the result set.
*
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings. If selection is null or does not contain ?s then
* selectionArgs may be null.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
@NonNull
public Cursor rawQuery(@NonNull String sql, @Nullable String[] selectionArgs) {
return rawQueryWithFactory(null, sql, selectionArgs, null, null);
}
/**
* Runs the provided SQL and returns a {@link Cursor} over the result set.
*
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings. If selection is null or does not contain ?s then
* selectionArgs may be null.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
@NonNull
public Cursor rawQuery(@NonNull String sql, @Nullable String[] selectionArgs,
@Nullable CancellationSignal cancellationSignal) {
return rawQueryWithFactory(null, sql, selectionArgs, null, cancellationSignal);
}
/**
* Runs the provided SQL and returns a cursor over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings. If selection is null or does not contain ?s then
* selectionArgs may be null.
* @param editTable the name of the first table, which is editable
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
@NonNull
public Cursor rawQueryWithFactory(
@Nullable CursorFactory cursorFactory, @NonNull String sql,
@Nullable String[] selectionArgs, @NonNull String editTable) {
return rawQueryWithFactory(cursorFactory, sql, selectionArgs, editTable, null);
}
/**
* Runs the provided SQL and returns a cursor over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings. If selection is null or does not contain ?s then
* selectionArgs may be null.
* @param editTable the name of the first table, which is editable
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
@NonNull
public Cursor rawQueryWithFactory(
@Nullable CursorFactory cursorFactory, @NonNull String sql,
@Nullable String[] selectionArgs, @NonNull String editTable,
@Nullable CancellationSignal cancellationSignal) {
acquireReference();
try {
SQLiteCursorDriver driver = new SQLiteDirectCursorDriver(this, sql, editTable,
cancellationSignal);
return driver.query(cursorFactory != null ? cursorFactory : mCursorFactory,
selectionArgs);
} finally {
releaseReference();
}
}
/**
* Convenience method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be
* It has no means to return any data (such as the number of affected rows).
* Instead, you're encouraged to use {@link #insert(String, String, ContentValues)},
* {@link #update(String, ContentValues, String, String[])}, et al, when possible.
*
* When using {@link #enableWriteAheadLogging()}, journal_mode is
* automatically managed by this class. So, do not set journal_mode
* using "PRAGMA journal_mode'
* Note that {@code PRAGMA} values which apply on a per-connection basis
* should not be configured using this method; you should instead
* use {@link #execPerConnectionSQL} to ensure that they are uniformly
* applied to all current and future connections.
*
* For INSERT statements, use any of the following instead.
*
* For UPDATE statements, use any of the following instead.
*
* For DELETE statements, use any of the following instead.
*
* For example, the following are good candidates for using this method:
*
* When using {@link #enableWriteAheadLogging()}, journal_mode is
* automatically managed by this class. So, do not set journal_mode
* using "PRAGMA journal_mode'
* Note that {@code PRAGMA} values which apply on a per-connection basis
* should not be configured using this method; you should instead
* use {@link #execPerConnectionSQL} to ensure that they are uniformly
* applied to all current and future connections.
*
* Maximum cache size can ONLY be increased from its current size (default = 10).
* If this method is called with smaller size than the current maximum value,
* then IllegalStateException is thrown.
*
* This method is thread-safe.
*
* @param cacheSize the size of the cache. can be (0 to {@link #MAX_SQL_CACHE_SIZE})
* @throws IllegalStateException if input cacheSize > {@link #MAX_SQL_CACHE_SIZE}.
*/
public void setMaxSqlCacheSize(int cacheSize) {
if (cacheSize > MAX_SQL_CACHE_SIZE || cacheSize < 0) {
throw new IllegalStateException(
"expected value between 0 and " + MAX_SQL_CACHE_SIZE);
}
synchronized (mLock) {
throwIfNotOpenLocked();
final int oldMaxSqlCacheSize = mConfigurationLocked.maxSqlCacheSize;
mConfigurationLocked.maxSqlCacheSize = cacheSize;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.maxSqlCacheSize = oldMaxSqlCacheSize;
throw ex;
}
}
}
/** @hide */
@NeverCompile
public double getStatementCacheMissRate() {
synchronized (mLock) {
throwIfNotOpenLocked();
return mConnectionPoolLocked.getStatementCacheMissRate();
}
}
/**
* Sets whether foreign key constraints are enabled for the database.
*
* By default, foreign key constraints are not enforced by the database.
* This method allows an application to enable foreign key constraints.
* It must be called each time the database is opened to ensure that foreign
* key constraints are enabled for the session.
*
* A good time to call this method is right after calling {@link #openOrCreateDatabase}
* or in the {@link SQLiteOpenHelper#onConfigure} callback.
*
* When foreign key constraints are disabled, the database does not check whether
* changes to the database will violate foreign key constraints. Likewise, when
* foreign key constraints are disabled, the database will not execute cascade
* delete or update triggers. As a result, it is possible for the database
* state to become inconsistent. To perform a database integrity check,
* call {@link #isDatabaseIntegrityOk}.
*
* This method must not be called while a transaction is in progress.
*
* See also SQLite Foreign Key Constraints
* for more details about foreign key constraint support.
*
* When write-ahead logging is not enabled (the default), it is not possible for
* reads and writes to occur on the database at the same time. Before modifying the
* database, the writer implicitly acquires an exclusive lock on the database which
* prevents readers from accessing the database until the write is completed.
*
* In contrast, when write-ahead logging is enabled (by calling this method), write
* operations occur in a separate log file which allows reads to proceed concurrently.
* While a write is in progress, readers on other threads will perceive the state
* of the database as it was before the write began. When the write completes, readers
* on other threads will then perceive the new state of the database.
*
* It is a good idea to enable write-ahead logging whenever a database will be
* concurrently accessed and modified by multiple threads at the same time.
* However, write-ahead logging uses significantly more memory than ordinary
* journaling because there are multiple connections to the same database.
* So if a database will only be used by a single thread, or if optimizing
* concurrency is not very important, then write-ahead logging should be disabled.
*
* After calling this method, execution of queries in parallel is enabled as long as
* the database remains open. To disable execution of queries in parallel, either
* call {@link #disableWriteAheadLogging} or close the database and reopen it.
*
* The maximum number of connections used to execute queries in parallel is
* dependent upon the device memory and possibly other properties.
*
* If a query is part of a transaction, then it is executed on the same database handle the
* transaction was begun.
*
* Writers should use {@link #beginTransactionNonExclusive()} or
* {@link #beginTransactionWithListenerNonExclusive(SQLiteTransactionListener)}
* to start a transaction. Non-exclusive mode allows database file to be in readable
* by other threads executing queries.
*
* If the database has any attached databases, then execution of queries in parallel is NOT
* possible. Likewise, write-ahead logging is not supported for read-only databases
* or memory databases. In such cases, {@link #enableWriteAheadLogging} returns false.
*
* The best way to enable write-ahead logging is to pass the
* {@link #ENABLE_WRITE_AHEAD_LOGGING} flag to {@link #openDatabase}. This is
* more efficient than calling {@link #enableWriteAheadLogging}.
*
* Another way to enable write-ahead logging is to call {@link #enableWriteAheadLogging}
* after opening the database.
*
* See also SQLite Write-Ahead Logging for
* more details about how write-ahead logging works.
*
* If the result is false, then this method logs the errors reported by the integrity_check
* command execution.
*
* Note that 'pragma integrity_check' on a database can take a long time.
*
* @return true if the given database (and all its attached databases) pass integrity_check,
* false otherwise.
*/
public boolean isDatabaseIntegrityOk() {
acquireReference();
try {
List If the value isn't set, the timeout defaults to the system wide timeout
*
* @return timeout in milliseconds or -1 if the value wasn't set.
*/
public long getIdleConnectionTimeout() {
return mIdleConnectionTimeout;
}
/**
* Returns journal mode.
* set via {@link Builder#setJournalMode(String)}.
*/
@Nullable
public String getJournalMode() {
return mJournalMode;
}
/**
* Returns synchronous mode.
* If not set, a system wide default will be used.
* @see Builder#setSynchronousMode(String)
*/
@Nullable
public String getSynchronousMode() {
return mSyncMode;
}
/**
* Creates a new instance of builder {@link Builder#Builder(OpenParams) initialized} with
* {@code this} parameters.
* @hide
*/
@NonNull
public Builder toBuilder() {
return new Builder(this);
}
/**
* Builder for {@link OpenParams}.
*/
public static final class Builder {
private int mLookasideSlotSize = -1;
private int mLookasideSlotCount = -1;
private long mIdleConnectionTimeout = -1;
private int mOpenFlags;
private CursorFactory mCursorFactory;
private DatabaseErrorHandler mErrorHandler;
private String mJournalMode;
private String mSyncMode;
public Builder() {
}
public Builder(OpenParams params) {
mLookasideSlotSize = params.mLookasideSlotSize;
mLookasideSlotCount = params.mLookasideSlotCount;
mOpenFlags = params.mOpenFlags;
mCursorFactory = params.mCursorFactory;
mErrorHandler = params.mErrorHandler;
mJournalMode = params.mJournalMode;
mSyncMode = params.mSyncMode;
}
/**
* Configures
* lookaside memory allocator
*
* SQLite default settings will be used, if this method isn't called.
* Use {@code setLookasideConfig(0,0)} to disable lookaside
*
* Note: Provided slotSize/slotCount configuration is just a
* recommendation. The system may choose different values depending on a device, e.g.
* lookaside allocations can be disabled on low-RAM devices
*
* @param slotSize The size in bytes of each lookaside slot.
* @param slotCount The total number of lookaside memory slots per database connection.
*/
public Builder setLookasideConfig(@IntRange(from = 0) final int slotSize,
@IntRange(from = 0) final int slotCount) {
Preconditions.checkArgument(slotSize >= 0,
"lookasideSlotCount cannot be negative");
Preconditions.checkArgument(slotCount >= 0,
"lookasideSlotSize cannot be negative");
Preconditions.checkArgument(
(slotSize > 0 && slotCount > 0) || (slotCount == 0 && slotSize == 0),
"Invalid configuration: %d, %d", slotSize, slotCount);
mLookasideSlotSize = slotSize;
mLookasideSlotCount = slotCount;
return this;
}
/**
* Returns true if {@link #ENABLE_WRITE_AHEAD_LOGGING} flag is set
* @hide
*/
public boolean isWriteAheadLoggingEnabled() {
return (mOpenFlags & ENABLE_WRITE_AHEAD_LOGGING) != 0;
}
/**
* Sets flags to control database access mode
* @param openFlags The new flags to set
* @see #OPEN_READWRITE
* @see #OPEN_READONLY
* @see #CREATE_IF_NECESSARY
* @see #NO_LOCALIZED_COLLATORS
* @see #ENABLE_WRITE_AHEAD_LOGGING
* @return same builder instance for chaining multiple calls into a single statement
*/
@NonNull
public Builder setOpenFlags(@DatabaseOpenFlags int openFlags) {
mOpenFlags = openFlags;
return this;
}
/**
* Adds flags to control database access mode
*
* @param openFlags The new flags to add
* @return same builder instance for chaining multiple calls into a single statement
*/
@NonNull
public Builder addOpenFlags(@DatabaseOpenFlags int openFlags) {
mOpenFlags |= openFlags;
return this;
}
/**
* Removes database access mode flags
*
* @param openFlags Flags to remove
* @return same builder instance for chaining multiple calls into a single statement
*/
@NonNull
public Builder removeOpenFlags(@DatabaseOpenFlags int openFlags) {
mOpenFlags &= ~openFlags;
return this;
}
/**
* Sets {@link #ENABLE_WRITE_AHEAD_LOGGING} flag if {@code enabled} is {@code true},
* unsets otherwise
* @hide
*/
public void setWriteAheadLoggingEnabled(boolean enabled) {
if (enabled) {
addOpenFlags(ENABLE_WRITE_AHEAD_LOGGING);
} else {
removeOpenFlags(ENABLE_WRITE_AHEAD_LOGGING);
}
}
/**
* Set an optional factory class that is called to instantiate a cursor when query
* is called.
*
* @param cursorFactory instance
* @return same builder instance for chaining multiple calls into a single statement
*/
@NonNull
public Builder setCursorFactory(@Nullable CursorFactory cursorFactory) {
mCursorFactory = cursorFactory;
return this;
}
/**
* Sets {@link DatabaseErrorHandler} object to handle db corruption errors
*/
@NonNull
public Builder setErrorHandler(@Nullable DatabaseErrorHandler errorHandler) {
mErrorHandler = errorHandler;
return this;
}
/**
* Sets the maximum number of milliseconds that SQLite connection is allowed to be idle
* before it is closed and removed from the pool.
*
* DO NOT USE this method.
* This feature has negative side effects that are very hard to foresee.
* A connection timeout allows the system to internally close a connection to
* a SQLite database after a given timeout, which is good for reducing app's memory
* consumption.
* However the side effect is it will reset all of SQLite's per-connection
* states, which are typically modified with a {@code PRAGMA} statement, and
* these states will not be restored when a connection is re-established
* internally, and the system does not provide a callback for an app to reconfigure a
* connection.
* This feature may only be used if an app relies on none of such per-connection states.
*
* @param idleConnectionTimeoutMs timeout in milliseconds. Use {@link Long#MAX_VALUE}
* to allow unlimited idle connections.
*
* @see SQLiteOpenHelper#setIdleConnectionTimeout(long)
*
* @deprecated DO NOT USE this method. See the javadoc for the details.
*/
@NonNull
@Deprecated
public Builder setIdleConnectionTimeout(
@IntRange(from = 0) long idleConnectionTimeoutMs) {
Preconditions.checkArgument(idleConnectionTimeoutMs >= 0,
"idle connection timeout cannot be negative");
mIdleConnectionTimeout = idleConnectionTimeoutMs;
return this;
}
/**
* Sets journal mode
* to use.
*
* Note: If journal mode is not set, the platform will use a manufactured-specified
* default which can vary across devices.
*/
@NonNull
public Builder setJournalMode(@JournalMode @NonNull String journalMode) {
Objects.requireNonNull(journalMode);
mJournalMode = journalMode;
return this;
}
/**
* Sets synchronous mode
*
* Note: If sync mode is not set, the platform will use a manufactured-specified
* default which can vary across devices.
*/
@NonNull
public Builder setSynchronousMode(@SyncMode @NonNull String syncMode) {
Objects.requireNonNull(syncMode);
mSyncMode = syncMode;
return this;
}
/**
* Creates an instance of {@link OpenParams} with the options that were previously set
* on this builder
*/
@NonNull
public OpenParams build() {
return new OpenParams(mOpenFlags, mCursorFactory, mErrorHandler, mLookasideSlotSize,
mLookasideSlotCount, mIdleConnectionTimeout, mJournalMode, mSyncMode);
}
}
}
/** @hide */
@IntDef(flag = true, prefix = {"OPEN_", "CREATE_", "NO_", "ENABLE_"}, value = {
OPEN_READWRITE,
OPEN_READONLY,
CREATE_IF_NECESSARY,
NO_LOCALIZED_COLLATORS,
ENABLE_WRITE_AHEAD_LOGGING
})
@Retention(RetentionPolicy.SOURCE)
public @interface DatabaseOpenFlags {}
/** @hide */
public static void wipeDetected(String filename, String reason) {
wtfAsSystemServer(TAG, "DB wipe detected:"
+ " package=" + ActivityThread.currentPackageName()
+ " reason=" + reason
+ " file=" + filename
+ " " + getFileTimestamps(filename)
+ " checkfile " + getFileTimestamps(filename + SQLiteGlobal.WIPE_CHECK_FILE_SUFFIX),
new Throwable("STACKTRACE"));
}
/** @hide */
public static String getFileTimestamps(String path) {
try {
BasicFileAttributes attr = Files.readAttributes(
FileSystems.getDefault().getPath(path), BasicFileAttributes.class);
return "ctime=" + attr.creationTime()
+ " mtime=" + attr.lastModifiedTime()
+ " atime=" + attr.lastAccessTime();
} catch (IOException e) {
return "[unable to obtain timestamp]";
}
}
/** @hide */
static void wtfAsSystemServer(String tag, String message, Throwable stacktrace) {
Log.e(tag, message, stacktrace);
ContentResolver.onDbCorruption(tag, message, stacktrace);
}
}
null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided values is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your values is empty.
* @param values this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long insert(@NonNull String table, @Nullable String nullColumnHack,
@Nullable ContentValues values) {
try {
return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE);
} catch (SQLException e) {
Log.e(TAG, "Error inserting " + values, e);
return -1;
}
}
/**
* Convenience method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided values is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your values is empty.
* @param values this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @throws SQLException
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long insertOrThrow(@NonNull String table, @Nullable String nullColumnHack,
@Nullable ContentValues values) throws SQLException {
return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE);
}
/**
* Convenience method for replacing a row in the database.
* Inserts a new row if a row does not already exist.
*
* @param table the table in which to replace the row
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for
* the row. The keys should be the column names and the values the column values.
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long replace(@NonNull String table, @Nullable String nullColumnHack,
@Nullable ContentValues initialValues) {
try {
return insertWithOnConflict(table, nullColumnHack, initialValues,
CONFLICT_REPLACE);
} catch (SQLException e) {
Log.e(TAG, "Error inserting " + initialValues, e);
return -1;
}
}
/**
* Convenience method for replacing a row in the database.
* Inserts a new row if a row does not already exist.
*
* @param table the table in which to replace the row
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for
* the row. The keys should be the column names and the values the column values.
* @throws SQLException
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long replaceOrThrow(@NonNull String table, @Nullable String nullColumnHack,
@Nullable ContentValues initialValues) throws SQLException {
return insertWithOnConflict(table, nullColumnHack, initialValues,
CONFLICT_REPLACE);
}
/**
* General method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @param conflictAlgorithm for insert conflict resolver
* @return the row ID of the newly inserted row OR -1 if either the
* input parameter conflictAlgorithm = {@link #CONFLICT_IGNORE}
* or an error occurred.
*/
public long insertWithOnConflict(@NonNull String table, @Nullable String nullColumnHack,
@Nullable ContentValues initialValues, int conflictAlgorithm) {
acquireReference();
try {
StringBuilder sql = new StringBuilder();
sql.append("INSERT");
sql.append(CONFLICT_VALUES[conflictAlgorithm]);
sql.append(" INTO ");
sql.append(table);
sql.append('(');
Object[] bindArgs = null;
int size = (initialValues != null && !initialValues.isEmpty())
? initialValues.size() : 0;
if (size > 0) {
bindArgs = new Object[size];
int i = 0;
for (String colName : initialValues.keySet()) {
sql.append((i > 0) ? "," : "");
sql.append(colName);
bindArgs[i++] = initialValues.get(colName);
}
sql.append(')');
sql.append(" VALUES (");
for (i = 0; i < size; i++) {
sql.append((i > 0) ? ",?" : "?");
}
} else {
sql.append(nullColumnHack).append(") VALUES (NULL");
}
sql.append(')');
SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs);
try {
return statement.executeInsert();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Convenience method for deleting rows in the database.
*
* @param table the table to delete from
* @param whereClause the optional WHERE clause to apply when deleting.
* Passing null will delete all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings. If whereClause is null or does not
* contain ?s then whereArgs may be null.
* @return the number of rows affected if a whereClause is passed in, 0
* otherwise. To remove all rows and get a count pass "1" as the
* whereClause.
*/
public int delete(@NonNull String table, @Nullable String whereClause,
@Nullable String[] whereArgs) {
acquireReference();
try {
SQLiteStatement statement = new SQLiteStatement(this, "DELETE FROM " + table +
(!TextUtils.isEmpty(whereClause) ? " WHERE " + whereClause : ""), whereArgs);
try {
return statement.executeUpdateDelete();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Convenience method for updating rows in the database.
*
* @param table the table to update in
* @param values a map from column names to new column values. null is a
* valid value that will be translated to NULL.
* @param whereClause the optional WHERE clause to apply when updating.
* Passing null will update all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings. If whereClause is null or does not
* contain ?s then whereArgs may be null.
* @return the number of rows affected
*/
public int update(@NonNull String table, @Nullable ContentValues values,
@Nullable String whereClause, @Nullable String[] whereArgs) {
return updateWithOnConflict(table, values, whereClause, whereArgs, CONFLICT_NONE);
}
/**
* Convenience method for updating rows in the database.
*
* @param table the table to update in
* @param values a map from column names to new column values. null is a
* valid value that will be translated to NULL.
* @param whereClause the optional WHERE clause to apply when updating.
* Passing null will update all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings. If whereClause is null or does not
* contain ?s then whereArgs may be null.
* @param conflictAlgorithm for update conflict resolver
* @return the number of rows affected
*/
public int updateWithOnConflict(@NonNull String table, @Nullable ContentValues values,
@Nullable String whereClause, @Nullable String[] whereArgs, int conflictAlgorithm) {
if (values == null || values.isEmpty()) {
throw new IllegalArgumentException("Empty values");
}
acquireReference();
try {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
sql.append(CONFLICT_VALUES[conflictAlgorithm]);
sql.append(table);
sql.append(" SET ");
// move all bind args to one array
int setValuesSize = values.size();
int bindArgsSize = (whereArgs == null) ? setValuesSize : (setValuesSize + whereArgs.length);
Object[] bindArgs = new Object[bindArgsSize];
int i = 0;
for (String colName : values.keySet()) {
sql.append((i > 0) ? "," : "");
sql.append(colName);
bindArgs[i++] = values.get(colName);
sql.append("=?");
}
if (whereArgs != null) {
for (i = setValuesSize; i < bindArgsSize; i++) {
bindArgs[i] = whereArgs[i - setValuesSize];
}
}
if (!TextUtils.isEmpty(whereClause)) {
sql.append(" WHERE ");
sql.append(whereClause);
}
SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs);
try {
return statement.executeUpdateDelete();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Execute a single SQL statement that is NOT a SELECT
* or any other SQL statement that returns data.
*
*
*
*
*
*
*
*
*
* database.beginTransaction();
* try {
* long initialValue = database.getTotalChangedRowCount();
* // Execute SQL statements
* long changedRows = database.getTotalChangedRowCount() - initialValue;
* // changedRows counts the total number of rows updated in the transaction.
* } finally {
* database.endTransaction();
* }
*
* SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory,
* SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.ENABLE_WRITE_AHEAD_LOGGING,
* myDatabaseErrorHandler);
*
* SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory,
* SQLiteDatabase.CREATE_IF_NECESSARY, myDatabaseErrorHandler);
* db.enableWriteAheadLogging();
*