System.Data.SQLite
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Overview
Comment:Modify transactions to allow immediate or deferred writelocks
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SHA1: 2b393018dbff0324149e9da682d970f0fbbbcb84
User & Date: rmsimpson 2005-12-09 19:59:20
Context
2005-12-09
19:59
Comments updated check-in: 18b915d1eb user: rmsimpson tags: sourceforge
19:59
Modify transactions to allow immediate or deferred writelocks check-in: 2b393018db user: rmsimpson tags: sourceforge
2005-12-07
22:40
Fix over-aggressive preparation of statements before execution check-in: ba2464b7f6 user: rmsimpson tags: sourceforge
Changes
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Changes to System.Data.SQLite/SQLiteConnection.cs.

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      }
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="isolationLevel">SQLite doesn't support varying isolation levels, so this parameter is ignored.</param>



    /// <returns>Returns a SQLiteTransaction object.</returns>
    public new SQLiteTransaction BeginTransaction(IsolationLevel isolationLevel)












    {
      if (_connectionState != ConnectionState.Open)
        throw new InvalidOperationException();

      if (_activeTransaction != null)
        throw new ArgumentException("Transaction already pending");

      _activeTransaction = new SQLiteTransaction(this);
      return _activeTransaction;
    }











    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public new SQLiteTransaction BeginTransaction()
    {
      return BeginTransaction(IsolationLevel.Unspecified);
    }

    /// <summary>
    /// Forwards to the local BeginTransaction() function
    /// </summary>
    /// <param name="isolationLevel"></param>
    /// <returns></returns>
    protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
    {
      return BeginTransaction(isolationLevel);
    }

    /// <summary>
    /// Not implemented
    /// </summary>
    /// <param name="databaseName"></param>
    public override void ChangeDatabase(string databaseName)







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      }
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="isolationLevel">SQLite doesn't support varying isolation levels, so this parameter is ignored.</param>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
    /// environment, one may instead choose to lock the database immediately to avoid any possible writer deadlock.</param>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public SQLiteTransaction BeginTransaction(IsolationLevel isolationLevel, bool deferredLock)
    {
      return BeginTransaction(true);
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
    /// environment, one may instead choose to lock the database immediately to avoid any possible writer deadlock.</param>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public SQLiteTransaction BeginTransaction(bool deferredLock)
    {
      if (_connectionState != ConnectionState.Open)
        throw new InvalidOperationException();

      if (_activeTransaction != null)
        throw new ArgumentException("Transaction already pending");

      _activeTransaction = new SQLiteTransaction(this, deferredLock);
      return _activeTransaction;
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="isolationLevel">SQLite doesn't support varying isolation levels, so this parameter is ignored.</param>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public new SQLiteTransaction BeginTransaction(IsolationLevel isolationLevel)
    {
      return BeginTransaction(true);
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public new SQLiteTransaction BeginTransaction()
    {
      return BeginTransaction(true);
    }

    /// <summary>
    /// Forwards to the local BeginTransaction() function
    /// </summary>
    /// <param name="isolationLevel"></param>
    /// <returns></returns>
    protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
    {
      return BeginTransaction(isolationLevel, true);
    }

    /// <summary>
    /// Not implemented
    /// </summary>
    /// <param name="databaseName"></param>
    public override void ChangeDatabase(string databaseName)

Changes to System.Data.SQLite/SQLiteTransaction.cs.

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    /// </summary>
    internal SQLiteConnection _cnn;

    /// <summary>
    /// Constructs the transaction object, binding it to the supplied connection
    /// </summary>
    /// <param name="cnn">The connection to open a transaction on</param>

    internal SQLiteTransaction(SQLiteConnection cnn)
    {
      try
      {

        cnn._sql.Execute("BEGIN IMMEDIATE");



        _cnn = cnn;
      }
      catch (SQLiteException)
      {
        BaseDispose();
        throw;
      }







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    /// </summary>
    internal SQLiteConnection _cnn;

    /// <summary>
    /// Constructs the transaction object, binding it to the supplied connection
    /// </summary>
    /// <param name="cnn">The connection to open a transaction on</param>
    /// <param name="deferredLock">TRUE to defer the writelock, or FALSE to lock immediately</param>
    internal SQLiteTransaction(SQLiteConnection cnn, bool deferredLock)
    {
      try
      {
        if (!deferredLock)
          cnn._sql.Execute("BEGIN IMMEDIATE");
        else
          cnn._sql.Execute("BEGIN");

        _cnn = cnn;
      }
      catch (SQLiteException)
      {
        BaseDispose();
        throw;
      }