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.
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。。。。
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