public MySqlTransactionScope(MySqlConnection con, Transaction trans,
MySqlTransaction simpleTransaction)
{
connection = con;
baseTransaction = trans;
this.simpleTransaction = simpleTransaction;
}
/// <include file='docs/mysqlcommand.xml' path='docs/ctor4/*'/>
public MySqlCommand(string cmdText, MySqlConnection connection,
MySqlTransaction transaction)
:
this(cmdText, connection)
{
curTransaction = transaction;
}
internal void CloseFully()
{
if (Settings.Pooling && driver.IsOpen)
{
// if we are in a transaction, roll it back
if (driver.HasStatus(ServerStatusFlags.InTransaction))
{
MySqlTransaction t = new MySqlTransaction(this, IsolationLevel.Unspecified);
t.Rollback();
}
MySqlPoolManager.ReleaseConnection(driver);
}
driver.Close();
driver = null;
}
/// <include file='docs/MySqlConnection.xml' path='docs/BeginTransaction1/*'/>
public new MySqlTransaction BeginTransaction(IsolationLevel iso)
{
//TODO: check note in help
if (State != ConnectionState.Open)
Throw(new InvalidOperationException(Resources.ConnectionNotOpen));
// First check to see if we are in a current transaction
if (driver.HasStatus(ServerStatusFlags.InTransaction))
Throw(new InvalidOperationException(Resources.NoNestedTransactions));
MySqlTransaction t = new MySqlTransaction(this, iso);
MySqlCommand cmd = new MySqlCommand("", this);
cmd.CommandText = "SET SESSION TRANSACTION ISOLATION LEVEL ";
switch (iso)
{
case IsolationLevel.ReadCommitted:
cmd.CommandText += "READ COMMITTED";
break;
case IsolationLevel.ReadUncommitted:
cmd.CommandText += "READ UNCOMMITTED";
break;
case IsolationLevel.RepeatableRead:
cmd.CommandText += "REPEATABLE READ";
break;
case IsolationLevel.Serializable:
cmd.CommandText += "SERIALIZABLE";
break;
case IsolationLevel.Chaos:
Throw(new NotSupportedException(Resources.ChaosNotSupported));
break;
case IsolationLevel.Snapshot:
Throw(new NotSupportedException(Resources.SnapshotNotSupported));
break;
}
cmd.ExecuteNonQuery();
cmd.CommandText = "BEGIN";
cmd.ExecuteNonQuery();
return t;
}
private static Task<MySqlDataReader> ExecuteReaderAsync(MySqlConnection connection, MySqlTransaction transaction, string commandText, MySqlParameter[] commandParameters, bool ExternalConn, CancellationToken cancellationToken)
{
var result = new TaskCompletionSource<MySqlDataReader>();
if (cancellationToken == CancellationToken.None || !cancellationToken.IsCancellationRequested)
{
try
{
var reader = ExecuteReader(connection, transaction, commandText, commandParameters, ExternalConn);
result.SetResult(reader);
}
catch (Exception ex)
{
result.SetException(ex);
}
}
else
{
result.SetCanceled();
}
return result.Task;
}
/// <summary>
/// Async version of ExecuteReader
/// </summary>
/// <param name="connection"><see cref="MySqlConnection"/> object to use for the command</param>
/// <param name="transaction"><see cref="MySqlTransaction"/> object to use for the command</param>
/// <param name="commandText">Command text to use</param>
/// <param name="commandParameters">Array of <see cref="MySqlParameter"/> objects to use with the command</param>
/// <param name="ExternalConn">True if the connection should be preserved, false if not</param>
/// <returns><see cref="MySqlDataReader"/> object ready to read the results of the command</returns>
private static Task<MySqlDataReader> ExecuteReaderAsync(MySqlConnection connection, MySqlTransaction transaction, string commandText, MySqlParameter[] commandParameters, bool ExternalConn)
{
return ExecuteReaderAsync(connection, transaction, commandText, commandParameters, ExternalConn, CancellationToken.None);
}
/// <summary>
/// Executes a single command against a MySQL database, possibly inside an existing transaction.
/// </summary>
/// <param name="connection"><see cref="MySqlConnection"/> object to use for the command</param>
/// <param name="transaction"><see cref="MySqlTransaction"/> object to use for the command</param>
/// <param name="commandText">Command text to use</param>
/// <param name="commandParameters">Array of <see cref="MySqlParameter"/> objects to use with the command</param>
/// <param name="ExternalConn">True if the connection should be preserved, false if not</param>
/// <returns><see cref="MySqlDataReader"/> object ready to read the results of the command</returns>
private static MySqlDataReader ExecuteReader(MySqlConnection connection, MySqlTransaction transaction, string commandText, MySqlParameter[] commandParameters, bool ExternalConn)
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = connection;
cmd.Transaction = transaction;
cmd.CommandText = commandText;
cmd.CommandType = CommandType.Text;
if (commandParameters != null)
foreach (MySqlParameter p in commandParameters)
cmd.Parameters.Add(p);
//create a reader
MySqlDataReader dr;
// call ExecuteReader with the appropriate CommandBehavior
if (ExternalConn)
{
dr = cmd.ExecuteReader();
}
else
{
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return dr;
}
