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)

 1   public class DBHelper   2     {   3         private static string localStr = "server=(local);User ID=sa;Password=password01!;Database=LocalDB;Persist Security Info=True;Pooling=true;Max Pool Size=700";   4         public static DbContext GetContext()   5         {   6             return new DbContext().ConnectionString(localStr);   7         }   8         public static System.Data.IDbConnection GetDapperConnection()   9         {  10             return new System.Data.SqlClient.SqlConnection(localStr);  11         }  12     }

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(1, 3014) });              }              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(1, 3014) }).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(1, 3014));              }              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(1, 3014)).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 = "18922223333", Status = 0 });              }              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", "18912345678")                                                 .Parameter("Status", 0).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 = "18911112222", Status = 0 }).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(1, 10000) });              }              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(1, 10000) }).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(1, 10000)).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。。。。