Dapper是一款轻量级ORM工具（Github）。如果你在小的项目中，使用Entity Framework、NHibernate 来处理大数据访问及关系映射，未免有点杀鸡用牛刀。你又觉得ORM省时省力，这时Dapper将是你的不二选择。
一、为什么选择Dapper
1、性能优越
在各大网站上，我们大概都会看到这样的一个对比效果图，在超过500次poco serialization的过程中所表现的性能，我们发现dapper是第二名，当然第一名谁也无法超越，越底层的就越快，同时也就越麻烦。就好像谁能超过“01代码”呢？？？
2、支持多数据库
支持多数据库的本质是因为Dapper对IDBConnection接口进行了方法扩展，我们可以在SqlMapper.cs中看出来，SqlConnection、MySqlConnection、OracleConnection都继承自DBConnection，而DBConnection实现了IDBConnection接口，因此Dapper对IDBConnection接口的扩展项对SqlServer、MySql、Oracle均有效。
二、安装Dapper
1. 通过nuget安装Dapper
2、 在github上获取源码
你如果想在开发过程中对Dapper进行调试的话，那就要用到源码了，我们只需把项目完整的下载下来，然后把Dapper文件夹拷贝到我们的项目中即可。
三、实现增删改查
1、insert单个对象
-
[
HttpPost]
-
public ActionResult Create(FormCollection collection)
-
{
-
try
-
{
-
// FormCollection只能接收post请求传递的参数
-
using (IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
int result = connection.Execute(
"insert into Sys_User_bak values(@Id,@Name,@Phone,@Address,@CreateDate)",
new
-
{
-
Id = collection[
"id"],
-
Name = collection[
"name"],
-
Phone = collection[
"phone"],
-
Address = collection[
"address"],
-
CreateDate = DateTime.Now
-
});
-
}
-
return RedirectToAction(
"Index");
-
}
-
catch
-
{
-
return View();
-
}
-
}
2、insert多个对象
-
[
HttpPost]
-
public ActionResult CreateSome(FormCollection collection)
-
{
-
try
-
{
-
using (IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
//使用匿名对象存储数组，Range(0,10)的实际范围是[0,10)
-
var userList = Enumerable.Range(
0,
10).Select(i =>
new
-
{
-
Id = i + Convert.ToInt32(collection[
"id"]),
-
Name = i + collection[
"name"],
-
Phone = i + collection[
"phone"],
-
Address = i + collection[
"address"],
-
CreateDate = DateTime.Now
-
});
-
int result = connection.Execute(
"insert into Sys_User_bak values(@Id,@Name,@Phone,@Address,@CreateDate)", userList);
-
}
-
return RedirectToAction(
"Index");
-
}
-
catch
-
{
-
return View();
-
}
-
}
3、delete操作（单个对象&多个对象）
-
[
HttpPost]
-
public ActionResult Delete(int id, FormCollection collection)
-
{
-
try
-
{
-
using(IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
connection.Execute(
"delete from Sys_User_bak where Id=@Id",
new { Id = id });
-
}
-
return RedirectToAction(
"Index");
-
}
-
catch
-
{
-
return View();
-
}
-
}
4、update操作 （单个对象&多个对象）
-
[
HttpPost]
-
public ActionResult Edit(int id, FormCollection collection)
-
{
-
try
-
{
-
using(IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
int result = connection.Execute(
"update Sys_User_bak set Name=@Name,Phone=@Phone,Address=@Address where Id=@Id",
new
-
{
-
Name=collection[
"name"],
-
Phone = collection[
"phone"],
-
Address = collection[
"address"],
-
Id = collection[
"id"]
-
});
-
}
-
return RedirectToAction(
"Index");
-
}
-
catch
-
{
-
return View();
-
}
-
}
5、select单个对象
-
public ActionResult DetailsOne(int id, FormCollection collection)
-
{
-
using(IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
Sys_User_bak user = connection.QueryFirst<Sys_User_bak>(
"select Id,Name,Phone,Address from Sys_User_bak where Id>@Id and Name like @Name",
new
-
{
-
Id = id,
-
Name =
"%" + collection[
"name"] +
"%"
-
});
-
}
-
return View();
-
}
6、select多个对象
-
public ActionResult DetailsSome(int id, FormCollection collection)
-
{
-
try
-
{
-
#region 查询多个对象
-
using (IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
List<Sys_User_bak> userList = connection.Query<Sys_User_bak>(
"select Id,Name,Phone,Address from Sys_User_bak where Id>@Id and Name like @Name",
new
-
{
-
Id = id,
-
Name =
"%" + collection[
"name"] +
"%"
-
}).AsList();
-
}
-
#endregion
-
-
return RedirectToAction(
"Index");
-
}
-
catch (Exception ex)
-
{
-
return View();
-
}
-
}
四、执行事务
-
public ActionResult ExecuteTransaction(int id, string name)
-
{
-
//[1]事务1
-
IDbTransaction transaction =
null;
-
try
-
{
-
#region 执行select存储过程
-
using (IDbConnection connection =
new SqlConnection(ConfigurationManager.ConnectionStrings[
"NHibernate"].ConnectionString))
-
{
-
//[2]事务2
-
transaction = connection.BeginTransaction();
-
List<Sys_User_bak> userList = connection.Query<Sys_User_bak>(
"proc_GetSysUser",
new
-
{
-
Id = id,
-
Name = name
-
}, commandType: CommandType.StoredProcedure).AsList();
-
//[3]事务3
-
transaction.Commit();
-
}
-
#endregion
-
-
return RedirectToAction(
"Index");
-
}
-
catch (Exception ex)
-
{
-
//[4]事务4
-
transaction.Rollback();
-
return View();
-
}
-
}