Dapper.Net实现增删改查

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/xiaouncle/article/details/82962459

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();
    }
}