System.Data.SQLite

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Overview
Comment:Add a new overload for the SQLiteBlob.Create method that is a thinner wrapper over the native API, for greater efficiency. Pursuant to [dfc8133ba2].
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SHA1: e28ff15b0e6ad569caa7abc7a98272fbe1054784
User & Date: mistachkin 2018-04-18 15:27:56.659
Context
2018-04-18
15:48
Update version history docs. check-in: 6f0089d0c2 user: mistachkin tags: trunk
15:27
Add a new overload for the SQLiteBlob.Create method that is a thinner wrapper over the native API, for greater efficiency. Pursuant to [dfc8133ba2]. check-in: e28ff15b0e user: mistachkin tags: trunk
2018-04-13
12:56
Update SQLite core library to the 3.23.1 release. check-in: a6429adaa8 user: mistachkin tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
Changes to System.Data.SQLite/SQLiteBlob.cs.
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        /// </returns>
        public static SQLiteBlob Create(
            SQLiteDataReader dataReader,
            int i,
            bool readOnly
            )
        {












































            SQLiteConnection connection = SQLiteDataReader.GetConnection(
                dataReader);






            if (connection == null)
                throw new InvalidOperationException("Connection not available");

            SQLite3 sqlite3 = connection._sql as SQLite3;

            if (sqlite3 == null)
                throw new InvalidOperationException("Connection has no wrapper");

            SQLiteConnectionHandle handle = sqlite3._sql;

            if (handle == null)
                throw new InvalidOperationException("Connection has an invalid handle.");

            long? rowId = dataReader.GetRowId(i);

            if (rowId == null)
                throw new InvalidOperationException("No RowId is available");

            SQLiteBlobHandle blob = null;

            try
            {
                // do nothing.
            }
            finally /* NOTE: Thread.Abort() protection. */
            {
                IntPtr ptrBlob = IntPtr.Zero;

                SQLiteErrorCode rc = UnsafeNativeMethods.sqlite3_blob_open(
                    handle, SQLiteConvert.ToUTF8(
                        dataReader.GetDatabaseName(i)), SQLiteConvert.ToUTF8(
                    dataReader.GetTableName(i)), SQLiteConvert.ToUTF8(
                        dataReader.GetName(i)), (long)rowId, readOnly ? 0 : 1,
                    ref ptrBlob);

                if (rc != SQLiteErrorCode.Ok)
                    throw new SQLiteException(rc, null);

                blob = new SQLiteBlobHandle(handle, ptrBlob);
            }

            SQLiteConnection.OnChanged(null, new ConnectionEventArgs(
                SQLiteConnectionEventType.NewCriticalHandle, null,
                null, null, dataReader, blob, null, new object[] {
                typeof(SQLiteBlob), dataReader, i, readOnly }));

            return new SQLiteBlob(sqlite3, blob);
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////////////////////////////









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        /// </returns>
        public static SQLiteBlob Create(
            SQLiteDataReader dataReader,
            int i,
            bool readOnly
            )
        {
            if (dataReader == null)
                throw new ArgumentNullException("dataReader");

            long? rowId = dataReader.GetRowId(i);

            if (rowId == null)
                throw new InvalidOperationException("No RowId is available");

            return Create(
                SQLiteDataReader.GetConnection(dataReader),
                dataReader.GetDatabaseName(i), dataReader.GetTableName(i),
                dataReader.GetName(i), (long)rowId, readOnly);
        }

        ///////////////////////////////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Creates a <see cref="SQLiteBlob" /> object.  This will not work
        /// for tables that were created WITHOUT ROWID.
        /// </summary>
        /// <param name="connection">
        /// The connection to use when opening the blob object.
        /// </param>
        /// <param name="databaseName">
        /// The name of the database containing the blob object.
        /// </param>
        /// <param name="tableName">
        /// The name of the table containing the blob object.
        /// </param>
        /// <param name="columnName">
        /// The name of the column containing the blob object.
        /// </param>
        /// <param name="rowId">
        /// The integer identifier for the row associated with the desired
        /// blob object.
        /// </param>
        /// <param name="readOnly">
        /// Non-zero to open the blob object for read-only access.
        /// </param>
        /// <returns>
        /// The newly created <see cref="SQLiteBlob" /> instance -OR- null
        /// if an error occurs.
        /// </returns>
        public static SQLiteBlob Create(
            SQLiteConnection connection,
            string databaseName,
            string tableName,
            string columnName,
            long rowId,
            bool readOnly
            )
        {
            if (connection == null)
                throw new ArgumentNullException("connection");

            SQLite3 sqlite3 = connection._sql as SQLite3;

            if (sqlite3 == null)
                throw new InvalidOperationException("Connection has no wrapper");

            SQLiteConnectionHandle handle = sqlite3._sql;

            if (handle == null)
                throw new InvalidOperationException("Connection has an invalid handle.");






            SQLiteBlobHandle blob = null;

            try
            {
                // do nothing.
            }
            finally /* NOTE: Thread.Abort() protection. */
            {
                IntPtr ptrBlob = IntPtr.Zero;

                SQLiteErrorCode rc = UnsafeNativeMethods.sqlite3_blob_open(
                    handle, SQLiteConvert.ToUTF8(databaseName),
                    SQLiteConvert.ToUTF8(tableName), SQLiteConvert.ToUTF8(

                    columnName), rowId, readOnly ? 0 : 1, ref ptrBlob);


                if (rc != SQLiteErrorCode.Ok)
                    throw new SQLiteException(rc, null);

                blob = new SQLiteBlobHandle(handle, ptrBlob);
            }

            SQLiteConnection.OnChanged(connection, new ConnectionEventArgs(
                SQLiteConnectionEventType.NewCriticalHandle, null, null,
                null, null, blob, null, new object[] { typeof(SQLiteBlob),
                databaseName, tableName, columnName, rowId, readOnly }));

            return new SQLiteBlob(sqlite3, blob);
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////////////////////////////
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