EF 记录执行的sql语句

最近做了个中等的项目，数据不会很多，开发时间比较紧迫，所以用了EF的框架。

在使用过程中，发现有时候执行的结果不如预期，想看看执行的sql语句为何，遍查找资料，在网上找到了相关辅助类，拿来使用，部署到生产环境。

代码如下：

    public class EFIntercepterLogging : DbCommandInterceptor
    {

        ILog log = LogManager.GetLogger("InfoAppender");
        private readonly Stopwatch _stopwatch = new Stopwatch();
        public override void ScalarExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            SaveCmdSql(command);
            base.ScalarExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void ScalarExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            _stopwatch.Stop();
            SaveCmdSql(command);
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} rn --> Error executing command: {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("rn执行时间:{0} 毫秒rn-->ScalarExecuted.Command:{1}rn", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.ScalarExecuted(command, interceptionContext);
        }
        public override void NonQueryExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            SaveCmdSql(command);
            base.NonQueryExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void NonQueryExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            _stopwatch.Stop();
            SaveCmdSql(command);
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} rn --> Error executing command:rn {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("rn执行时间:{0} 毫秒rn-->NonQueryExecuted.Command:rn{1}", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.NonQueryExecuted(command, interceptionContext);
        }
        /// <summary>
        /// 读取操作
        /// </summary>
        /// <param name="command"></param>
        /// <param name="interceptionContext"></param>
        public override void ReaderExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
        {
            SaveCmdSql(command);
            base.ReaderExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void ReaderExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
        {
            _stopwatch.Stop();
            SaveCmdSql(command);
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} rn --> Error executing command:rn {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("rn执行时间:{0} 毫秒 rn -->ReaderExecuted.Command:rn{1}", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.ReaderExecuted(command, interceptionContext);
        }
        //保存执行的sql语句
        public void SaveCmdSql(DbCommand command)
        {
            log.Info(command.CommandText);
        }

    }

代码比较容易理解，重点在 DbCommandInterceptor 这个类.

msdn 链接：https://docs.microsoft.com/zh-cn/dotnet/api/system.data.entity.infrastructure.interception.dbcommandinterceptor?view=entity-framework-6.2.0

需要Global.asax中全局注册该方法，才能使用

  DbInterception.Add(new EFIntercepterLogging());//注册EF监控,写日志