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SqlClientBatchingBatcher.cs
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#if NETFX
using System;
using System.Data.Common;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using NHibernate.AdoNet.Util;
using NHibernate.Driver;
using NHibernate.Exceptions;
namespace NHibernate.AdoNet
{
public class SqlClientBatchingBatcher : AbstractBatcher
{
private int _batchSize;
private int _totalExpectedRowsAffected;
private SqlClientSqlCommandSet _currentBatch;
private StringBuilder _currentBatchCommandsLog;
private readonly int _defaultTimeout;
public SqlClientBatchingBatcher(ConnectionManager connectionManager, IInterceptor interceptor)
: base(connectionManager, interceptor)
{
_batchSize = Factory.Settings.AdoBatchSize;
_defaultTimeout = Driver.GetCommandTimeout();
_currentBatch = CreateConfiguredBatch();
//we always create this, because we need to deal with a scenario in which
//the user change the logging configuration at runtime. Trying to put this
//behind an if(log.IsDebugEnabled) will cause a null reference exception
//at that point.
_currentBatchCommandsLog = new StringBuilder().AppendLine("Batch commands:");
}
public override int BatchSize
{
get { return _batchSize; }
set { _batchSize = value; }
}
protected override int CountOfStatementsInCurrentBatch
{
get { return _currentBatch.CountOfCommands; }
}
public override void AddToBatch(IExpectation expectation)
{
_totalExpectedRowsAffected += expectation.ExpectedRowCount;
var batchUpdate = CurrentCommand;
Driver.AdjustCommand(batchUpdate);
string lineWithParameters = null;
var sqlStatementLogger = Factory.Settings.SqlStatementLogger;
if (sqlStatementLogger.IsDebugEnabled || Log.IsDebugEnabled())
{
lineWithParameters = sqlStatementLogger.GetCommandLineWithParameters(batchUpdate);
var formatStyle = sqlStatementLogger.DetermineActualStyle(FormatStyle.Basic);
lineWithParameters = formatStyle.Formatter.Format(lineWithParameters);
_currentBatchCommandsLog.Append("command ")
.Append(_currentBatch.CountOfCommands)
.Append(":")
.AppendLine(lineWithParameters);
}
if (Log.IsDebugEnabled())
{
Log.Debug("Adding to batch:{0}", lineWithParameters);
}
_currentBatch.Append((System.Data.SqlClient.SqlCommand)batchUpdate);
if (_currentBatch.CountOfCommands >= _batchSize)
{
ExecuteBatchWithTiming(batchUpdate);
}
}
public override Task AddToBatchAsync(IExpectation expectation, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return Task.FromCanceled<object>(cancellationToken);
}
try
{
_totalExpectedRowsAffected += expectation.ExpectedRowCount;
var batchUpdate = CurrentCommand;
Driver.AdjustCommand(batchUpdate);
string lineWithParameters = null;
var sqlStatementLogger = Factory.Settings.SqlStatementLogger;
if (sqlStatementLogger.IsDebugEnabled || Log.IsDebugEnabled())
{
lineWithParameters = sqlStatementLogger.GetCommandLineWithParameters(batchUpdate);
var formatStyle = sqlStatementLogger.DetermineActualStyle(FormatStyle.Basic);
lineWithParameters = formatStyle.Formatter.Format(lineWithParameters);
_currentBatchCommandsLog.Append("command ")
.Append(_currentBatch.CountOfCommands)
.Append(":")
.AppendLine(lineWithParameters);
}
if (Log.IsDebugEnabled())
{
Log.Debug("Adding to batch:{0}", lineWithParameters);
}
_currentBatch.Append((System.Data.SqlClient.SqlCommand) batchUpdate);
if (_currentBatch.CountOfCommands >= _batchSize)
{
return ExecuteBatchWithTimingAsync(batchUpdate, cancellationToken);
}
return Task.CompletedTask;
}
catch (Exception ex)
{
return Task.FromException<object>(ex);
}
}
protected override void DoExecuteBatch(DbCommand ps)
{
try
{
Log.Debug("Executing batch");
CheckReaders();
Prepare(_currentBatch.BatchCommand);
if (Factory.Settings.SqlStatementLogger.IsDebugEnabled)
{
Factory.Settings.SqlStatementLogger.LogBatchCommand(_currentBatchCommandsLog.ToString());
}
int rowsAffected;
try
{
rowsAffected = _currentBatch.ExecuteNonQuery();
}
catch (DbException e)
{
throw ADOExceptionHelper.Convert(Factory.SQLExceptionConverter, e, "could not execute batch command.");
}
Expectations.VerifyOutcomeBatched(_totalExpectedRowsAffected, rowsAffected, ps);
}
finally
{
ClearCurrentBatch();
}
}
protected override async Task DoExecuteBatchAsync(DbCommand ps, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
try
{
Log.Debug("Executing batch");
await (CheckReadersAsync(cancellationToken)).ConfigureAwait(false);
await (PrepareAsync(_currentBatch.BatchCommand, cancellationToken)).ConfigureAwait(false);
if (Factory.Settings.SqlStatementLogger.IsDebugEnabled)
{
Factory.Settings.SqlStatementLogger.LogBatchCommand(_currentBatchCommandsLog.ToString());
}
int rowsAffected;
try
{
rowsAffected = _currentBatch.ExecuteNonQuery();
}
catch (DbException e)
{
throw ADOExceptionHelper.Convert(Factory.SQLExceptionConverter, e, "could not execute batch command.");
}
Expectations.VerifyOutcomeBatched(_totalExpectedRowsAffected, rowsAffected, ps);
}
finally
{
ClearCurrentBatch();
}
}
private SqlClientSqlCommandSet CreateConfiguredBatch()
{
var result = new SqlClientSqlCommandSet();
if (_defaultTimeout > 0)
{
try
{
result.CommandTimeout = _defaultTimeout;
}
catch (Exception e)
{
if (Log.IsWarnEnabled())
{
Log.Warn(e, e.ToString());
}
}
}
return result;
}
private void ClearCurrentBatch()
{
_currentBatch.Dispose();
_totalExpectedRowsAffected = 0;
_currentBatch = CreateConfiguredBatch();
if (Factory.Settings.SqlStatementLogger.IsDebugEnabled)
{
_currentBatchCommandsLog = new StringBuilder().AppendLine("Batch commands:");
}
}
public override void CloseCommands()
{
base.CloseCommands();
// Prevent exceptions when closing the batch from hiding any original exception
// (We do not know here if this batch closing occurs after a failure or not.)
try
{
ClearCurrentBatch();
}
catch (Exception e)
{
Log.Warn(e, "Exception clearing batch");
}
}
protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
// Prevent exceptions when closing the batch from hiding any original exception
// (We do not know here if this batch closing occurs after a failure or not.)
try
{
_currentBatch.Dispose();
}
catch (Exception e)
{
Log.Warn(e, "Exception closing batcher");
}
}
}
}
#endif