Initial commit of first working version that is used in production environment.
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grzegorz.russek
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DynamORM/DynamicCommand.cs
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205
DynamORM/DynamicCommand.cs
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/*
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* DynamORM - Dynamic Object-Relational Mapping library.
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* Copyright (c) 2012, Grzegorz Russek (grzegorz.russek@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Data;
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namespace DynamORM
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{
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/// <summary>Helper class to easy manage command.</summary>
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public class DynamicCommand : IDbCommand
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{
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private IDbCommand _command;
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private int? _commandTimeout = null;
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private DynamicConnection _con;
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private DynamicDatabase _db;
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private long _poolStamp = 0;
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/// <summary>Initializes a new instance of the <see cref="DynamicCommand"/> class.</summary>
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/// <param name="con">The connection.</param>
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/// <param name="db">The databas manager.</param>
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internal DynamicCommand(DynamicConnection con, DynamicDatabase db)
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{
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_con = con;
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_db = db;
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lock (_db.SyncLock)
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{
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if (!_db.CommandsPool.ContainsKey(_con.Connection))
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throw new InvalidOperationException("Can't create transaction using disposed connection.");
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else
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{
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_command = _con.Connection.CreateCommand();
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_db.CommandsPool[_con.Connection].Add(_command);
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}
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}
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}
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/// <summary>Prepare command for execution.</summary>
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/// <returns>Returns edited <see cref="System.Data.IDbCommand"/> instance.</returns>
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private IDbCommand PrepareForExecution()
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{
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if (_poolStamp < _db.PoolStamp)
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{
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_command.CommandTimeout = _commandTimeout ?? _db.CommandTimeout ?? _command.CommandTimeout;
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if (_db.TransactionPool[_command.Connection].Count > 0)
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_command.Transaction = _db.TransactionPool[_command.Connection].Peek();
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_poolStamp = _db.PoolStamp;
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}
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return _db.DumpCommands ? _command.Dump(Console.Out) : _command;
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}
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#region IDbCommand Members
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/// <summary>
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/// Attempts to cancels the execution of an <see cref="T:System.Data.IDbCommand"/>.
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/// </summary>
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public void Cancel()
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{
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_command.Cancel();
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}
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/// <summary>
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/// Gets or sets the text command to run against the data source.
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/// </summary>
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/// <returns>The text command to execute. The default value is an empty string ("").</returns>
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public string CommandText { get { return _command.CommandText; } set { _command.CommandText = value; } }
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/// <summary>
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/// Gets or sets the wait time before terminating the attempt to execute a command and generating an error.
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/// </summary>
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/// <returns>The time (in seconds) to wait for the command to execute. The default value is 30 seconds.</returns>
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/// <exception cref="T:System.ArgumentException">The property value assigned is less than 0. </exception>
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public int CommandTimeout { get { return _commandTimeout ?? _command.CommandTimeout; } set { _commandTimeout = value; } }
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/// <summary>Gets or sets how the <see cref="P:System.Data.IDbCommand.CommandText"/> property is interpreted.</summary>
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public CommandType CommandType { get { return _command.CommandType; } set { _command.CommandType = value; } }
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/// <summary>Gets or sets the <see cref="T:System.Data.IDbConnection"/>
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/// used by this instance of the <see cref="T:System.Data.IDbCommand"/>.</summary>
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/// <returns>The connection to the data source.</returns>
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public IDbConnection Connection { get { return _con; } set { _con = (DynamicConnection)value; } }
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/// <summary>Creates a new instance of an
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/// <see cref="T:System.Data.IDbDataParameter"/> object.</summary>
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/// <returns>An <see cref="IDbDataParameter"/> object.</returns>
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public IDbDataParameter CreateParameter()
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{
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return _command.CreateParameter();
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}
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/// <summary>Executes an SQL statement against the Connection object of a
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/// data provider, and returns the number of rows affected.</summary>
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/// <returns>The number of rows affected.</returns>
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public int ExecuteNonQuery()
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{
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return PrepareForExecution().ExecuteNonQuery();
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}
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/// <summary>Executes the <see cref="P:System.Data.IDbCommand.CommandText"/>
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/// against the <see cref="P:System.Data.IDbCommand.Connection"/>,
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/// and builds an <see cref="T:System.Data.IDataReader"/> using one
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/// of the <see cref="T:System.Data.CommandBehavior"/> values.
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/// </summary><param name="behavior">One of the
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/// <see cref="T:System.Data.CommandBehavior"/> values.</param>
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/// <returns>An <see cref="T:System.Data.IDataReader"/> object.</returns>
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public IDataReader ExecuteReader(CommandBehavior behavior)
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{
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return PrepareForExecution().ExecuteReader(behavior);
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}
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/// <summary>Executes the <see cref="P:System.Data.IDbCommand.CommandText"/>
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/// against the <see cref="P:System.Data.IDbCommand.Connection"/> and
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/// builds an <see cref="T:System.Data.IDataReader"/>.</summary>
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/// <returns>An <see cref="T:System.Data.IDataReader"/> object.</returns>
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public IDataReader ExecuteReader()
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{
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return PrepareForExecution().ExecuteReader();
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}
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/// <summary>Executes the query, and returns the first column of the
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/// first row in the resultset returned by the query. Extra columns or
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/// rows are ignored.</summary>
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/// <returns>The first column of the first row in the resultset.</returns>
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public object ExecuteScalar()
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{
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return PrepareForExecution().ExecuteScalar();
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}
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/// <summary>Gets the <see cref="T:System.Data.IDataParameterCollection"/>.</summary>
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public IDataParameterCollection Parameters
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{
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get { return _command.Parameters; }
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}
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/// <summary>Creates a prepared (or compiled) version of the command on the data source.</summary>
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public void Prepare()
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{
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_command.Prepare();
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}
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/// <summary>Gets or sets the transaction within which the Command
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/// object of a data provider executes.</summary>
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/// <remarks>It's does nothing, transaction is peeked from transaction
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/// pool of a connection.</remarks>
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public IDbTransaction Transaction { get { return null; } set { } }
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/// <summary>Gets or sets how command results are applied to the <see cref="T:System.Data.DataRow"/>
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/// when used by the <see cref="M:System.Data.IDataAdapter.Update(System.Data.DataSet)"/>
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/// method of a <see cref="T:System.Data.Common.DbDataAdapter"/>.</summary>
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/// <returns>One of the <see cref="T:System.Data.UpdateRowSource"/> values. The default is
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/// Both unless the command is automatically generated. Then the default is None.</returns>
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/// <exception cref="T:System.ArgumentException">The value entered was not one of the
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/// <see cref="T:System.Data.UpdateRowSource"/> values. </exception>
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public UpdateRowSource UpdatedRowSource { get { return _command.UpdatedRowSource; } set { _command.UpdatedRowSource = value; } }
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#endregion IDbCommand Members
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#region IDisposable Members
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/// <summary>Performs application-defined tasks associated with
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/// freeing, releasing, or resetting unmanaged resources.</summary>
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public void Dispose()
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{
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lock (_db.SyncLock)
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{
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var pool = _db.CommandsPool.TryGetValue(_con.Connection);
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if (pool != null)
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pool.Remove(_command);
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_command.Dispose();
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}
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}
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#endregion IDisposable Members
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}
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}
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