微型 ORM 的第二篇 DapperLambda性能测试[Dapper比较篇]

由于这周比较忙，所以本来想做的性能测试，一直没时间，想想还是今天给补上吧

由于很多人都担心性能问题，封装之后跟Dapper的性能差距是多少，今天我给出我的测试方法，仅供参考.

1. 创建IDbConnection;(DapperLambda 已经把IDbConnection封装在DbContext，所以创建的是DbContext)

   public class DBHelper
     {
         private static string localStr = "server=(local);User ID=sa;Password=password01!;Database=LocalDB;Persist Security Info=True;Pooling=true;Max Pool Size=700";
         public static DbContext GetContext()
         {
             return new DbContext().ConnectionString(localStr);
         }
         public static System.Data.IDbConnection GetDapperConnection()
         {
             return new System.Data.SqlClient.SqlConnection(localStr);
         }
     }

2.主要针对几个增删改查，几个做比较，但是用到Dapper比较简单，都是执行SQL+参数。。

1).查询语句的比较

       public static long DapperSelect()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var conn = DBHelper.GetDapperConnection())
            {
                var item = conn.Query<Models.MobileForTest>("SELECT * FROM MobileForTest mft WHERE mft.ID=@ID", new { ID = r.Next(, ) });
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
       public static long DapperLambdaSQLSelect()
        {

            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var context = DBHelper.GetContext())
            {
                var item = context.Sql("SELECT * FROM MobileForTest mft WHERE mft.ID=@ID", new { ID = r.Next(, ) }).QueryMany<MobileForTest>();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaSelectByID()
        {

            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var context = DBHelper.GetContext())
            {
                var item = context.Select<MobileForTest>(r.Next(, ));
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaSelectByLambda()
        {

            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var context = DBHelper.GetContext())
            {
                var item = context.Select<MobileForTest>(p => p.ID == r.Next(, )).QueryMany();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }

原本计划是起四个线程，在各自线程里调用相应的方法500次，取总耗时时间，发现线程启动的顺序，对测试的结果有明显的影响。因此改成同步的调用每个方法500次，取平均时长。测试结果如下如。

跟预期差不多是一致。

2.单条数据插入的

        public static long DapperSQLInsert()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            using (var conn = DBHelper.GetDapperConnection())
            {
                conn.Execute(@"INSERT INTO [dbo].[MobileForTest]
                               ([MobileHolder]
                               ,[MobilePhone]
                               ,[Status])
                         VALUES
                               (@MobileHolder
                               ,@MobilePhone
                               ,@Status)", new { MobileHolder = "InsterWithTran", MobilePhone = "", Status =  });
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaSQLInsert()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            using (var context = DBHelper.GetContext())
            {
                context.Sql(@"INSERT INTO [dbo].[MobileForTest]
                               ([MobileHolder]
                               ,[MobilePhone]
                               ,[Status])
                         VALUES
                               (@MobileHolder
                               ,@MobilePhone
                               ,@Status)").Parameter("MobileHolder", "DapperLambdaSQLInsert")
                                               .Parameter("MobilePhone", "")
                                               .Parameter("Status", ).Execute();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaInsert()
        {
            List<MobileForTest> ls = new List<MobileForTest>();
            Stopwatch timer = new Stopwatch();
            timer.Start();
            using (var context = DBHelper.GetContext())
            {
                context.Insert<MobileForTest>(new MobileForTest { MobileHolder = "DapperLambdaInsert", MobilePhone = "", Status =  }).Execute();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }

循环500次执行，取平均耗时。

3.更新方法测试

        public static long DapperSQLUpdate()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var conn = DBHelper.GetDapperConnection())
            {
                conn.Execute("UPDATE MobileForTest SET MobileHolder = @MobileHolder WHERE ID=@ID", new { MobileHolder = "DapperSQLUpdate", ID = r.Next(, ) });
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaSQLUpdate()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var context = DBHelper.GetContext())
            {
                context.Sql("UPDATE MobileForTest SET MobileHolder = @MobileHolder WHERE ID=@ID", new { MobileHolder = "DapperLambdaSQLUpdate", ID = r.Next(, ) }).Execute();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }
        public static long DapperLambdaUpdate()
        {
            Stopwatch timer = new Stopwatch();
            timer.Start();
            Random r = new Random();
            using (var context = DBHelper.GetContext())
            {
                context.Update<MobileForTest>().Set(new { MobileHolder = "DapperLambdaUpdate" }).Where(p => p.ID == r.Next(, )).Execute();
            }
            timer.Stop();
            return timer.ElapsedMilliseconds;
        }

总体来说，测试的结果还在预期范围之类，在使用方便和些许的性能中各位抉择。如果有时间的话，考虑换掉Dapper，再重新比较一下。坚持。。。。