EntityFramework日志记录

首先在应用启动时执行：DbInterception.Add(new LogFormatter());

 

然后加入如下类：

    #region [ EF的数据库执行日志记录 ]
    public class LogFormatter : IDbCommandInterceptor
    {
        private readonly Stopwatch _stopwatch = new Stopwatch();

        public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            _stopwatch.Restart();
        }

        public void NonQueryExecuted(DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            _stopwatch.Stop();
            Log(command, interceptionContext);
        }

        public void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
        {
            _stopwatch.Restart();
        }

        public void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext)
        {
            _stopwatch.Stop();
            Log(command, interceptionContext);
        }

        public void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            _stopwatch.Restart();
        }

        public void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            _stopwatch.Stop();
            Log(command, interceptionContext);
        }

        private void Log<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext)
        {
            HRContractSqlLogger.Log(command, _stopwatch.ElapsedMilliseconds, interceptionContext.Exception);
        }
    }

    public static class HRContractSqlLogger
    {
        public static void Log(DbCommand command, long elapsedMilliseconds, Exception exception)
        {
            //Do something useful here with the raw data
            //Console.Write("SQL语句：" + command.CommandText + "
执行时长：" + elapsedMilliseconds.ToString());
            StringBuilder lsbParameters = new StringBuilder();
            for(int i=0;i<command.Parameters.Count;i++)
            {
                var p = command.Parameters[i];
                lsbParameters.Append(p.ParameterName + ":" + (p.Value == null ? "NULL":p.Value.ToString()) + " ");
            }
            if (exception == null)
            {
                Logger.WriteDBLog(command.CommandText, lsbParameters.ToString(), elapsedMilliseconds, Thread.CurrentThread.Name, "");
            }
            else
            {
                //SQL错误日志，一般情况下，在EF里，不会走到这里，如果有错，在Execute方法中就会抛出了，也走不到这里
                Logger.WriteErrorDBLog(command.CommandText + " " + exception.Message + "调用堆栈:" + exception.StackTrace, lsbParameters.ToString(), Thread.CurrentThread.Name,"");
            }
        }
    }

    #endregion

还有一种比较简单的方式：使用 DataBase.Log属性赋值，但上面这种方式更好一些。