我正在使用Entity Framework 6，它是非常棒的数据库拦截器功能，用于记录从应用程序数据库发送的查询。但是，我正在努力为这些查询计时，我有一个长时间运行的查询，返回数十万到数百万行，因此需要大约6到15秒，具体取决于此查询将返回的数据量。实体框架返回一个SqlDataReader，因为我无法获得获取结果所需的确切时间。我想知道从查询发送到读取最后一行的时间的完整执行时间。有没有办法可以做到。
答案 0 :(得分：25)
这是我通常用于EF的记录器。
public class EFLoggerForTesting : IDbCommandInterceptor
{
static readonly ConcurrentDictionary<DbCommand, DateTime> m_StartTime = new ConcurrentDictionary<DbCommand, DateTime>();
public void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
Log(command, interceptionContext);
}
public void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
Log(command, interceptionContext);
}
public void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
Log(command, interceptionContext);
}
private static void Log<T>(DbCommand command, DbCommandInterceptionContext<T> interceptionContext)
{
DateTime startTime;
TimeSpan duration;
if (m_StartTime.TryRemove(command, out startTime))
{
duration = DateTime.Now - startTime;
}
else
duration = TimeSpan.Zero;
var requestId =-1;
string message;
var parameters = new StringBuilder();
foreach (DbParameter param in command.Parameters)
{
parameters.AppendLine(param.ParameterName + " " + param.DbType + " = " + param.Value);
}
if (interceptionContext.Exception == null)
{
message = string.Format("Database call took {0} sec. RequestId {1} \r\nCommand:\r\n{2}", duration.TotalSeconds.ToString("N3"), requestId, parameters.ToString() + command.CommandText);
}
else
{
message = string.Format("EF Database call failed after {0} sec. RequestId {1} \r\nCommand:\r\n{2}\r\nError:{3} ", duration.TotalSeconds.ToString("N3"), requestId, parameters.ToString() + command.CommandText, interceptionContext.Exception);
}
Debug.WriteLine(message);
}
public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
OnStart(command);
}
public void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
OnStart(command);
}
public void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
OnStart(command);
}
private static void OnStart(DbCommand command)
{
m_StartTime.TryAdd(command, DateTime.Now);
}
}
不幸的是，文档不存在，所以我不知道这是否适用于您的场景。
答案 1 :(得分：4)
如果您使用的是Web应用程序，可以试试Glimpse：http://getglimpse.com/。否则，请尝试MiniProfiler：http://miniprofiler.com/。
答案 2 :(得分：1)
正如@Ricardo Peres的回答所暗示的那样，Glimpse对此很有好处。它附带了Glimpse.Ado插件，可用于轻松分析任何DbConnection，这是在此扩展的主要类。
Glimpse中ADO的手动集成点是将DbConnection打包在GlimpseDbConnection中，如本博文中所示：http://getglimpse.com/Docs/Manual-ADO-Integration。其他提供商（如EF）会自动与Glimpse.Ef包集成。
如果你仍然决定要手动实现这一点，我建议你自己包装DbConneciton并使用这个常规DbConnection。你可以做这个简单的时间。
你可以看到Glimpse如何在他们的github上做到这一点：https://github.com/Glimpse/Glimpse/tree/master/source/Glimpse.Ado/AlternateType
或者，始终可以选择在存储库级别或方法级别添加此类日志记录，具体取决于您需要的日志记录。
答案 3 :(得分：1)
Johnathan接受的答案的EF核心版本，适用于所有正在搜索的人：
using Microsoft.EntityFrameworkCore.Diagnostics;
using System.Data.Common;
public class EFLogger: DbCommandInterceptor
{
private static readonly ConcurrentDictionary<Guid, DateTime> _startTimes = new ConcurrentDictionary<Guid, DateTime>();
public override DbDataReader ReaderExecuted(DbCommand command, CommandExecutedEventData eventData, DbDataReader reader)
{
Log(command, eventData);
return reader;
}
public override int NonQueryExecuted(DbCommand command, CommandExecutedEventData eventData, int result)
{
Log(command, eventData);
return result;
}
public override object ScalarExecuted(DbCommand command, CommandExecutedEventData eventData, object result)
{
Log(command, eventData);
return result;
}
public override void CommandFailed(DbCommand command, CommandErrorEventData eventData)
{
Log(command, eventData);
}
private static void Log(DbCommand command, CommandEventData eventData)
{
TimeSpan? duration = null;
if (_startTimes.TryRemove(eventData.CommandId, out DateTime startTime))
duration = DateTime.Now - startTime;
var parameters = new StringBuilder();
foreach (DbParameter param in command.Parameters)
{
parameters.AppendLine(param.ParameterName + " " + param.DbType + " = " + param.Value);
}
string message = $"Database call {(eventData is CommandErrorEventData ? "FAILED" : "succeeded")} in {duration?.TotalMilliseconds ?? -1:N3} ms. CommandId {eventData.CommandId} \r\nCommand:\r\n{parameters}{command.CommandText}";
Console.WriteLine(message);
}
public override InterceptionResult<int> NonQueryExecuting(DbCommand command, CommandEventData eventData, InterceptionResult<int> result)
{
OnStart(eventData.CommandId);
return result;
}
public override InterceptionResult<DbDataReader> ReaderExecuting(DbCommand command, CommandEventData eventData, InterceptionResult<DbDataReader> result)
{
OnStart(eventData.CommandId);
return result;
}
public override InterceptionResult<object> ScalarExecuting(DbCommand command, CommandEventData eventData, InterceptionResult<object> result)
{
OnStart(eventData.CommandId);
return result;
}
private void OnStart(Guid commandId)
{
_startTimes.TryAdd(commandId, DateTime.Now);
}
}
答案 4 :(得分：0)
相当简单，但你不能使用System.Timers.Timer对象吗？在EF代码之前调用start，在EF代码之后调用end。如果你有异步代码，你可以调用.Result并删除等待，以便同步运行代码并计时。除此之外，如果您使用SQL分析器并从另一个中减去一个值（Timer - Profiler），您将了解EF代码执行的时间。
答案 5 :(得分：0)
以下是原始DatabaseLogFormatter的简化版。主要区别在于这个没有过滤，我没有记录实际的SQL查询或它的参数（因为我只对定时查询感兴趣）。它在打开连接，执行查询以及何时再次关闭连接时进行记录。正如@ aske-b noticed above使用DateTime（正如接受的答案所做的那样）并不是非常准确。
public class CustomDatabaseLogFormatter : IDbCommandInterceptor, IDbConnectionInterceptor
{
private readonly Action<string> _writeAction;
private readonly Stopwatch _stopwatch = new Stopwatch();
/// <summary>
/// Creates a formatter that will log every command from any context and also commands that do not originate from a context.
/// </summary>
/// <remarks>
/// This constructor is not used when a delegate is set on <see cref="Database.Log" />. Instead it can be
/// used by setting the formatter directly using <see cref="DbInterception.Add" />.
/// </remarks>
/// <param name="writeAction">The delegate to which output will be sent.</param>
public CustomDatabaseLogFormatter(Action<string> writeAction)
{
Check.NotNull(writeAction, "writeAction");
_writeAction = writeAction;
}
internal Action<string> WriteAction
{
get { return _writeAction; }
}
/// <summary>
/// Writes the given string to the underlying write delegate.
/// </summary>
/// <param name="output">The string to write.</param>
protected virtual void Write(string output)
{
_writeAction(output);
}
/// <summary>
/// The stopwatch used to time executions. This stopwatch is started at the end of
/// <see cref="NonQueryExecuting" />, <see cref="ScalarExecuting" />, and <see cref="ReaderExecuting" />
/// methods and is stopped at the beginning of the <see cref="NonQueryExecuted" />, <see cref="ScalarExecuted" />,
/// and <see cref="ReaderExecuted" /> methods. If these methods are overridden and the stopwatch is being used
/// then the overrides should either call the base method or start/stop the stopwatch themselves.
/// </summary>
/// <returns>The stopwatch.</returns>
protected internal Stopwatch Stopwatch
{
get { return _stopwatch; }
}
private void RestartStopwatch()
{
Stopwatch.Restart();
}
private void StopStopwatch()
{
Stopwatch.Stop();
}
#region IDbCommandInterceptor
/// <summary>
/// This method is called before a call to <see cref="DbCommand.ExecuteNonQuery" /> or
/// one of its async counterparts is made.
/// Starts the stopwatch returned from <see cref="Stopwatch"/>.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
RestartStopwatch();
}
/// <summary>
/// This method is called after a call to <see cref="DbCommand.ExecuteNonQuery" /> or
/// one of its async counterparts is made.
/// Stops the stopwatch returned from <see cref="Stopwatch"/> and calls <see cref="Executed" />.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
StopStopwatch();
Executed(command, interceptionContext);
}
/// <summary>
/// This method is called before a call to <see cref="DbCommand.ExecuteReader(CommandBehavior)" /> or
/// one of its async counterparts is made.
/// Starts the stopwatch returned from <see cref="Stopwatch"/>.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
RestartStopwatch();
}
/// <summary>
/// This method is called after a call to <see cref="DbCommand.ExecuteReader(CommandBehavior)" /> or
/// one of its async counterparts is made.
/// Stops the stopwatch returned from <see cref="Stopwatch"/> and calls <see cref="Executed" />.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
StopStopwatch();
Executed(command, interceptionContext);
}
/// <summary>
/// This method is called before a call to <see cref="DbCommand.ExecuteScalar" /> or
/// one of its async counterparts is made.
/// Starts the stopwatch returned from <see cref="Stopwatch"/>.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
RestartStopwatch();
}
/// <summary>
/// This method is called after a call to <see cref="DbCommand.ExecuteScalar" /> or
/// one of its async counterparts is made.
/// Stops the stopwatch returned from <see cref="Stopwatch"/> and calls
/// <see cref="Executed" />.
/// </summary>
/// <param name="command">The command being executed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public virtual void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
StopStopwatch();
Executed(command, interceptionContext);
}
/// <summary>
/// Called whenever a command has completed executing. Calls <see cref="LogResult" />.
/// </summary>
/// <typeparam name="TResult">The type of the operation's results.</typeparam>
/// <param name="command">The command that was executed.</param>
/// <param name="interceptionContext">Contextual information associated with the command.</param>
public virtual void Executed<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
LogResult(command, interceptionContext);
}
/// <summary>
/// Called to log the result of executing a command.
/// </summary>
/// <typeparam name="TResult">The type of the operation's results.</typeparam>
/// <param name="command">The command being logged.</param>
/// <param name="interceptionContext">Contextual information associated with the command.</param>
public virtual void LogResult<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext)
{
Check.NotNull(command, "command");
Check.NotNull(interceptionContext, "interceptionContext");
var stopwatch = Stopwatch;
if (interceptionContext.Exception != null)
{
Write(
String.Format(StringResources.CommandLogFailed, stopwatch.ElapsedMilliseconds, interceptionContext.Exception.Message)
);
}
else if (interceptionContext.TaskStatus.HasFlag(TaskStatus.Canceled))
{
Write(String.Format(StringResources.CommandLogCanceled, stopwatch.ElapsedMilliseconds));
}
else
{
var result = interceptionContext.Result;
var resultString = (object)result == null
? "null"
: (result is DbDataReader)
? result.GetType().Name
: result.ToString();
Write(String.Format(StringResources.CommandLogComplete, stopwatch.ElapsedMilliseconds, resultString));
}
}
#endregion
#region IDbConnectionInterceptor
public void BeginningTransaction(DbConnection connection, BeginTransactionInterceptionContext interceptionContext)
{ }
public void BeganTransaction(DbConnection connection, BeginTransactionInterceptionContext interceptionContext)
{ }
public void Closing(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{ }
/// <summary>
/// Called after <see cref="DbConnection.Close" /> is invoked.
/// </summary>
/// <param name="connection">The connection that was closed.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public void Closed(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{
Check.NotNull(connection, "connection");
Check.NotNull(interceptionContext, "interceptionContext");
if (interceptionContext.Exception != null)
{
Write(String.Format(StringResources.ConnectionCloseErrorLog, DateTimeOffset.UtcNow, interceptionContext.Exception.Message));
}
else
{
Write(String.Format(StringResources.ConnectionClosedLog, DateTimeOffset.UtcNow));
}
}
public void ConnectionStringGetting(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void ConnectionStringGot(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void ConnectionStringSetting(DbConnection connection, DbConnectionPropertyInterceptionContext<string> interceptionContext)
{ }
public void ConnectionStringSet(DbConnection connection, DbConnectionPropertyInterceptionContext<string> interceptionContext)
{ }
public void ConnectionTimeoutGetting(DbConnection connection, DbConnectionInterceptionContext<int> interceptionContext)
{ }
public void ConnectionTimeoutGot(DbConnection connection, DbConnectionInterceptionContext<int> interceptionContext)
{ }
public void DatabaseGetting(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void DatabaseGot(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void DataSourceGetting(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void DataSourceGot(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void Disposing(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{ }
public void Disposed(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{ }
public void EnlistingTransaction(DbConnection connection, EnlistTransactionInterceptionContext interceptionContext)
{ }
public void EnlistedTransaction(DbConnection connection, EnlistTransactionInterceptionContext interceptionContext)
{ }
public void Opening(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{ }
/// <summary>
/// Called after <see cref="DbConnection.Open" /> or its async counterpart is invoked.
/// </summary>
/// <param name="connection">The connection that was opened.</param>
/// <param name="interceptionContext">Contextual information associated with the call.</param>
public void Opened(DbConnection connection, DbConnectionInterceptionContext interceptionContext)
{
Check.NotNull(connection, "connection");
Check.NotNull(interceptionContext, "interceptionContext");
if (interceptionContext.Exception != null)
{
Write(
interceptionContext.IsAsync
? String.Format(StringResources.ConnectionOpenErrorLogAsync,
DateTimeOffset.UtcNow, interceptionContext.Exception.Message)
: String.Format(StringResources.ConnectionOpenErrorLog, DateTimeOffset.UtcNow, interceptionContext.Exception.Message));
}
else if (interceptionContext.TaskStatus.HasFlag(TaskStatus.Canceled))
{
Write(String.Format(StringResources.ConnectionOpenCanceledLog, DateTimeOffset.UtcNow));
}
else
{
Write(
interceptionContext.IsAsync
? String.Format(StringResources.ConnectionOpenedLogAsync, DateTimeOffset.UtcNow)
: String.Format(StringResources.ConnectionOpenedLog, DateTimeOffset.UtcNow));
}
}
public void ServerVersionGetting(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void ServerVersionGot(DbConnection connection, DbConnectionInterceptionContext<string> interceptionContext)
{ }
public void StateGetting(DbConnection connection, DbConnectionInterceptionContext<ConnectionState> interceptionContext)
{ }
public void StateGot(DbConnection connection, DbConnectionInterceptionContext<ConnectionState> interceptionContext)
{ }
#endregion
}
internal class Check
{
public static T NotNull<T>(T value, string parameterName)
where T : class
{
if (value == null)
{
throw new ArgumentNullException(parameterName);
}
return value;
}
}
StringResources.resx:
CommandLogCanceled Canceled in {0} ms{1}
CommandLogComplete Completed in {0} ms with result: {1}
CommandLogFailed Failed in {0} ms with error: {1}
ConnectionClosedLog Closed connection at {0}
ConnectionCloseErrorLog Failed to close connection at {0} with error: {1}
ConnectionOpenCanceledLog Cancelled open connection at {0}
ConnectionOpenedLog Opened connection at {0}
ConnectionOpenedLogAsync Opened connection asynchronously at {0}
ConnectionOpenErrorLog Failed to open connection at {0} with error: {1}
ConnectionOpenErrorLogAsync Failed to open connection asynchronously at {0} with error: {1}
答案 6 :(得分：0)
您可以尝试the example explained here
在此示例中，我们在命令开始执行时启动Stopwatch，并在命令完成时停止Stopwatch，这样我们就可以识别慢查询并记录它们。
public class SqlMonitorInterceptor : IDbCommandInterceptor
{
private static readonly ILog logger = LogManager.GetCurrentClassLogger();
private static readonly int sqlWarningThresholdMs = int.Parse(ConfigurationManager.AppSettings["sqlPerformance_warningThresholdMilliseconds"]);
private readonly Stopwatch _stopwatch = new Stopwatch();
public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
CommandExecuting();
}
public void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
{
CommandExecuted(command, interceptionContext);
}
public void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
CommandExecuting();
}
public void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
{
CommandExecuted(command, interceptionContext);
}
public void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
CommandExecuting();
}
public void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
{
CommandExecuted(command, interceptionContext);
}
private void CommandExecuting() {
_stopwatch.Restart();
}
private void CommandExecuted<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext)
{
_stopwatch.Stop();
LogIfError(command, interceptionContext);
LogIfTooSlow(command, _stopwatch.Elapsed);
}
private void LogIfError<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext)
{
if (interceptionContext.Exception != null)
{
logger.ErrorFormat("Command {0} failed with exception {1}",
command.CommandText, interceptionContext.Exception);
}
}
private void LogIfTooSlow(DbCommand command, TimeSpan completionTime)
{
if (completionTime.TotalMilliseconds > sqlWarningThresholdMs)
{
logger.WarnFormat("Query time ({0}ms) exceeded the threshold of {1}ms. Command: \"{2}\"",
completionTime.TotalMilliseconds, sqlWarningThresholdMs, command.CommandText);
}
}
}