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#if MYSQL_6_9
// Copyright � 2004, 2011, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections;
using System.IO;
using System.Text;
using Externals.MySql.Data.Common;
using System.Data;
using Externals.MySql.Data.MySqlClient.Properties;
using System.Collections.Generic;
namespace Externals.MySql.Data.MySqlClient
{
internal abstract class Statement
{
protected MySqlCommand command;
protected string commandText;
private List<MySqlPacket> buffers;
private Statement(MySqlCommand cmd)
{
command = cmd;
buffers = new List<MySqlPacket>();
}
public Statement(MySqlCommand cmd, string text)
: this(cmd)
{
commandText = text;
}
#region Properties
public virtual string ResolvedCommandText
{
get { return commandText; }
}
protected Driver Driver
{
get { return command.Connection.driver; }
}
protected MySqlConnection Connection
{
get { return command.Connection; }
}
protected MySqlParameterCollection Parameters
{
get { return command.Parameters; }
}
#endregion
public virtual void Close(MySqlDataReader reader)
{
}
public virtual void Resolve(bool preparing)
{
}
public virtual void Execute()
{
// we keep a reference to this until we are done
BindParameters();
ExecuteNext();
}
public virtual bool ExecuteNext()
{
if (buffers.Count == 0)
return false;
MySqlPacket packet = (MySqlPacket)buffers[0];
//MemoryStream ms = stream.InternalBuffer;
Driver.SendQuery(packet);
buffers.RemoveAt(0);
return true;
}
protected virtual void BindParameters()
{
MySqlParameterCollection parameters = command.Parameters;
int index = 0;
while (true)
{
InternalBindParameters(ResolvedCommandText, parameters, null);
// if we are not batching, then we are done. This is only really relevant the
// first time through
if (command.Batch == null) return;
while (index < command.Batch.Count)
{
MySqlCommand batchedCmd = command.Batch[index++];
MySqlPacket packet = (MySqlPacket)buffers[buffers.Count - 1];
// now we make a guess if this statement will fit in our current stream
long estimatedCmdSize = batchedCmd.EstimatedSize();
if (((packet.Length - 4) + estimatedCmdSize) > Connection.driver.MaxPacketSize)
{
// it won't, so we setup to start a new run from here
parameters = batchedCmd.Parameters;
break;
}
// looks like we might have room for it so we remember the current end of the stream
buffers.RemoveAt(buffers.Count - 1);
//long originalLength = packet.Length - 4;
// and attempt to stream the next command
string text = ResolvedCommandText;
if (text.StartsWith("(", StringComparison.Ordinal))
packet.WriteStringNoNull(", ");
else
packet.WriteStringNoNull("; ");
InternalBindParameters(text, batchedCmd.Parameters, packet);
if ((packet.Length - 4) > Connection.driver.MaxPacketSize)
{
//TODO
//stream.InternalBuffer.SetLength(originalLength);
parameters = batchedCmd.Parameters;
break;
}
}
if (index == command.Batch.Count)
return;
}
}
private void InternalBindParameters(string sql, MySqlParameterCollection parameters,
MySqlPacket packet)
{
bool sqlServerMode = command.Connection.Settings.SqlServerMode;
if (packet == null)
{
packet = new MySqlPacket(Driver.Encoding);
packet.Version = Driver.Version;
packet.WriteByte(0);
}
MySqlTokenizer tokenizer = new MySqlTokenizer(sql);
tokenizer.ReturnComments = true;
tokenizer.SqlServerMode = sqlServerMode;
int pos = 0;
string token = tokenizer.NextToken();
int parameterCount = 0;
while (token != null)
{
// serialize everything that came before the token (i.e. whitespace)
packet.WriteStringNoNull(sql.Substring(pos, tokenizer.StartIndex - pos));
pos = tokenizer.StopIndex;
if (MySqlTokenizer.IsParameter(token))
{
if ((!parameters.containsUnnamedParameters && token.Length == 1 && parameterCount > 0) || parameters.containsUnnamedParameters && token.Length > 1)
throw new MySqlException(Resources.MixedParameterNamingNotAllowed);
parameters.containsUnnamedParameters = token.Length == 1;
if (SerializeParameter(parameters, packet, token, parameterCount))
token = null;
parameterCount++;
}
if (token != null)
{
if (sqlServerMode && tokenizer.Quoted && token.StartsWith("[", StringComparison.Ordinal))
token = String.Format("`{0}`", token.Substring(1, token.Length - 2));
packet.WriteStringNoNull(token);
}
token = tokenizer.NextToken();
}
buffers.Add(packet);
}
protected virtual bool ShouldIgnoreMissingParameter(string parameterName)
{
if (Connection.Settings.AllowUserVariables)
return true;
if (parameterName.StartsWith("@" + StoredProcedure.ParameterPrefix, StringComparison.OrdinalIgnoreCase))
return true;
if (parameterName.Length > 1 &&
(parameterName[1] == '`' || parameterName[1] == '\''))
return true;
return false;
}
/// <summary>
/// Serializes the given parameter to the given memory stream
/// </summary>
/// <remarks>
/// <para>This method is called by PrepareSqlBuffers to convert the given
/// parameter to bytes and write those bytes to the given memory stream.
/// </para>
/// </remarks>
/// <returns>True if the parameter was successfully serialized, false otherwise.</returns>
private bool SerializeParameter(MySqlParameterCollection parameters,
MySqlPacket packet, string parmName, int parameterIndex)
{
MySqlParameter parameter = null;
if (!parameters.containsUnnamedParameters)
parameter = parameters.GetParameterFlexible(parmName, false);
else
{
if (parameterIndex <= parameters.Count)
parameter = parameters[parameterIndex];
else
throw new MySqlException(Resources.ParameterIndexNotFound);
}
if (parameter == null)
{
// if we are allowing user variables and the parameter name starts with @
// then we can't throw an exception
if (parmName.StartsWith("@", StringComparison.Ordinal) && ShouldIgnoreMissingParameter(parmName))
return false;
throw new MySqlException(
String.Format(Resources.ParameterMustBeDefined, parmName));
}
parameter.Serialize(packet, false, Connection.Settings);
return true;
}
}
}
#endif