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#if MYSQL_6_10
// Copyright ?2004, 2016, 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 Externals.MySql.Data.Common;using System;using System.Collections.Generic;
namespace Externals.MySql.Data.MySqlClient{ internal abstract class Statement { protected MySqlCommand command; private readonly List<MySqlPacket> _buffers; protected string commandText;
private Statement(MySqlCommand cmd) { command = cmd; _buffers = new List<MySqlPacket>(); }
protected Statement(MySqlCommand cmd, string text) : this(cmd) { commandText = text; }
#region Properties
public virtual string ResolvedCommandText { get { return commandText; } }
protected Driver Driver => command.Connection.driver;
protected MySqlConnection Connection => command.Connection;
protected MySqlParameterCollection Parameters => 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 = _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) { Version = Driver.Version }; packet.WriteByte(0); }
MySqlTokenizer tokenizer = new MySqlTokenizer(sql) { ReturnComments = true, 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
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