///////////////////////////////////////////////////////////////////////////////////////////////
// It isn't necessary to cleanup any functions we've registered. If the connection
// goes to the pool and is resurrected later, re-registered functions will overwrite the
// previous functions. The SQLiteFunctionCookieHandle will take care of freeing unmanaged
// resources belonging to the previously-registered functions.
internal override void Close(bool canThrow)
{
if (_sql != null)
{
if (!_sql.OwnHandle)
{
_sql = null;
return;
}
if (_usePool)
{
if (SQLiteBase.ResetConnection(_sql, _sql, canThrow))
{
#if INTEROP_VIRTUAL_TABLE
DisposeModules();
#endif
SQLiteConnectionPool.Add(_fileName, _sql, _poolVersion);
#if !NET_COMPACT_20 && TRACE_CONNECTION
Trace.WriteLine(String.Format("Close (Pool) Success: {0}", _sql));
#endif
}
#if !NET_COMPACT_20 && TRACE_CONNECTION
else
{
Trace.WriteLine(String.Format("Close (Pool) Failure: {0}", _sql));
}
#endif
}
else
{
_sql.Dispose();
}
_sql = null;
}
}
internal override void Open(string strFilename, SQLiteConnectionFlags connectionFlags, SQLiteOpenFlagsEnum openFlags, int maxPoolSize, bool usePool)
{
//
// NOTE: If the database connection is currently open, attempt to
// close it now. This must be done because the file name or
// other parameters that may impact the underlying database
// connection may have changed.
//
if (_sql != null) Close(true);
//
// NOTE: If the connection was not closed successfully, throw an
// exception now.
//
if (_sql != null)
throw new SQLiteException("connection handle is still active");
_usePool = usePool;
_fileName = strFilename;
if (usePool)
{
_sql = SQLiteConnectionPool.Remove(strFilename, maxPoolSize, out _poolVersion);
#if !NET_COMPACT_20 && TRACE_CONNECTION
Trace.WriteLine(String.Format("Open16 (Pool): {0}", (_sql != null) ? _sql.ToString() : "<null>"));
#endif
}
if (_sql == null)
{
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
IntPtr db;
SQLiteErrorCode n;
#if !SQLITE_STANDARD
if ((connectionFlags & SQLiteConnectionFlags.NoExtensionFunctions) != SQLiteConnectionFlags.NoExtensionFunctions)
{
n = UnsafeNativeMethods.sqlite3_open16_interop(ToUTF8(strFilename), openFlags, out db);
}
else
#endif
{
//
// NOTE: This flag check is designed to enforce the constraint that opening
// a database file that does not already exist requires specifying the
// "Create" flag, even when a native API is used that does not accept
// a flags parameter.
//
if (((openFlags & SQLiteOpenFlagsEnum.Create) != SQLiteOpenFlagsEnum.Create) && !File.Exists(strFilename))
throw new SQLiteException(SQLiteErrorCode.CantOpen, strFilename);
n = UnsafeNativeMethods.sqlite3_open16(strFilename, out db);
}
#if !NET_COMPACT_20 && TRACE_CONNECTION
Trace.WriteLine(String.Format("Open16: {0}", db));
#endif
if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
_sql = new SQLiteConnectionHandle(db, true);
}
lock (_sql) { /* HACK: Force the SyncBlock to be "created" now. */ }
SQLiteConnection.OnChanged(null, new ConnectionEventArgs(
SQLiteConnectionEventType.NewCriticalHandle, null, null,
null, null, _sql, strFilename, new object[] { strFilename,
connectionFlags, openFlags, maxPoolSize, usePool }));
}
// Bind functions to this connection. If any previous functions of the same name
// were already bound, then the new bindings replace the old.
if ((connectionFlags & SQLiteConnectionFlags.NoBindFunctions) != SQLiteConnectionFlags.NoBindFunctions)
{
if (_functions == null)
_functions = new List<SQLiteFunction>();
_functions.AddRange(new List<SQLiteFunction>(SQLiteFunction.BindFunctions(this, connectionFlags)));
}
SetTimeout(0);
GC.KeepAlive(_sql);
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// Adds a connection to the pool of those associated with the
/// specified database file name.
/// </summary>
/// <param name="fileName">
/// The database file name.
/// </param>
/// <param name="handle">
/// The database connection handle.
/// </param>
/// <param name="version">
/// The connection pool version at the point the database connection
/// handle was received from the connection pool. This is also the
/// connection pool version that the database connection handle was
/// created under.
/// </param>
internal static void Add(
string fileName,
SQLiteConnectionHandle handle,
int version
)
{
ISQLiteConnectionPool connectionPool = GetConnectionPool();
if (connectionPool != null)
{
connectionPool.Add(fileName, handle, version);
}
else
{
lock (_syncRoot)
{
//
// NOTE: If the queue does not exist in the pool, then it
// must have been cleared sometime after the
// connection was created.
//
PoolQueue queue;
if (_queueList.TryGetValue(fileName, out queue) &&
(version == queue.PoolVersion))
{
ResizePool(queue, true);
Queue<WeakReference> poolQueue = queue.Queue;
if (poolQueue == null) return;
poolQueue.Enqueue(new WeakReference(handle, false));
Interlocked.Increment(ref _poolClosed);
}
else
{
handle.Close();
}
GC.KeepAlive(handle);
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Constructs the object used to interact with the SQLite core library
/// using the UTF-8 text encoding.
/// </summary>
/// <param name="fmt">
/// The DateTime format to be used when converting string values to a
/// DateTime and binding DateTime parameters.
/// </param>
/// <param name="kind">
/// The <see cref="DateTimeKind" /> to be used when creating DateTime
/// values.
/// </param>
/// <param name="fmtString">
/// The format string to be used when parsing and formatting DateTime
/// values.
/// </param>
/// <param name="db">
/// The native handle to be associated with the database connection.
/// </param>
/// <param name="fileName">
/// The fully qualified file name associated with <paramref name="db "/>.
/// </param>
/// <param name="ownHandle">
/// Non-zero if the newly created object instance will need to dispose
/// of <paramref name="db" /> when it is no longer needed.
/// </param>
internal SQLite3(
SQLiteDateFormats fmt,
DateTimeKind kind,
string fmtString,
IntPtr db,
string fileName,
bool ownHandle
)
: base(fmt, kind, fmtString)
{
if (db != IntPtr.Zero)
{
_sql = new SQLiteConnectionHandle(db, ownHandle);
_fileName = fileName;
SQLiteConnection.OnChanged(null, new ConnectionEventArgs(
SQLiteConnectionEventType.NewCriticalHandle, null, null,
null, null, _sql, fileName, new object[] { fmt, kind,
fmtString, db, fileName, ownHandle }));
}
}
///////////////////////////////////////////////////////////////////////
internal SQLiteStatementHandle(SQLiteConnectionHandle cnn, IntPtr stmt)
: this()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
this.cnn = cnn;
SetHandle(stmt);
}
}
///////////////////////////////////////////////////////////////////////
internal SQLiteBackupHandle(SQLiteConnectionHandle cnn, IntPtr backup)
: this()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
this.cnn = cnn;
SetHandle(backup);
}
}
internal static bool IsAutocommit(SQLiteConnectionHandle hdl, IntPtr db)
{
if ((hdl == null) || (db == IntPtr.Zero)) return false;
bool result = false;
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
#if PLATFORM_COMPACTFRAMEWORK
lock (hdl.syncRoot)
#else
lock (hdl)
#endif
{
if (!hdl.IsInvalid && !hdl.IsClosed)
result = (UnsafeNativeMethods.sqlite3_get_autocommit(db) == 1);
}
}
GC.KeepAlive(hdl); /* NOTE: Unreachable code. */
return result;
}
internal static bool ResetConnection(SQLiteConnectionHandle hdl, IntPtr db, bool canThrow)
{
if ((hdl == null) || (db == IntPtr.Zero)) return false;
bool result = false;
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
#if PLATFORM_COMPACTFRAMEWORK
lock (hdl.syncRoot)
#else
lock (hdl)
#endif
{
if (canThrow && hdl.IsInvalid)
throw new InvalidOperationException("The connection handle is invalid.");
if (canThrow && hdl.IsClosed)
throw new InvalidOperationException("The connection handle is closed.");
if (!hdl.IsInvalid && !hdl.IsClosed)
{
IntPtr stmt = IntPtr.Zero;
SQLiteErrorCode n;
do
{
stmt = UnsafeNativeMethods.sqlite3_next_stmt(db, stmt);
if (stmt != IntPtr.Zero)
{
#if !SQLITE_STANDARD
n = UnsafeNativeMethods.sqlite3_reset_interop(stmt);
#else
n = UnsafeNativeMethods.sqlite3_reset(stmt);
#endif
}
} while (stmt != IntPtr.Zero);
//
// NOTE: Is a transaction NOT pending on the connection?
//
if (IsAutocommit(hdl, db))
{
result = true;
}
else
{
n = UnsafeNativeMethods.sqlite3_exec(
db, ToUTF8("ROLLBACK"), IntPtr.Zero, IntPtr.Zero,
out stmt);
if (n == SQLiteErrorCode.Ok)
{
result = true;
}
else if (canThrow)
{
throw new SQLiteException(n, GetLastError(hdl, db));
}
}
}
}
}
GC.KeepAlive(hdl);
return result;
}
internal static void CloseConnectionV2(SQLiteConnectionHandle hdl, IntPtr db)
{
if ((hdl == null) || (db == IntPtr.Zero)) return;
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
#if PLATFORM_COMPACTFRAMEWORK
lock (hdl.syncRoot)
#else
lock (hdl)
#endif
{
#if !SQLITE_STANDARD
SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_close_interop(db);
#else
ResetConnection(hdl, db, false);
SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_close_v2(db);
#endif
if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, GetLastError(hdl, db));
}
}
}
internal static void FinalizeStatement(SQLiteConnectionHandle hdl, IntPtr stmt)
{
if ((hdl == null) || (stmt == IntPtr.Zero)) return;
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
#if PLATFORM_COMPACTFRAMEWORK
lock (hdl.syncRoot)
#else
lock (hdl)
#endif
{
#if !SQLITE_STANDARD
SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_finalize_interop(stmt);
#else
SQLiteErrorCode n = UnsafeNativeMethods.sqlite3_finalize(stmt);
#endif
if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
}
}
}
internal static string GetLastError(SQLiteConnectionHandle hdl, IntPtr db)
{
if ((hdl == null) || (db == IntPtr.Zero))
return "null connection or database handle";
string result = null;
try
{
// do nothing.
}
finally /* NOTE: Thread.Abort() protection. */
{
#if PLATFORM_COMPACTFRAMEWORK
lock (hdl.syncRoot)
#else
lock (hdl)
#endif
{
if (!hdl.IsInvalid && !hdl.IsClosed)
{
#if !SQLITE_STANDARD
int len;
result = UTF8ToString(UnsafeNativeMethods.sqlite3_errmsg_interop(db, out len), len);
#else
result = UTF8ToString(UnsafeNativeMethods.sqlite3_errmsg(db), -1);
#endif
}
else
{
result = "closed or invalid connection handle";
}
}
}
GC.KeepAlive(hdl);
return result;
}
