Dapper 增删改查

0.数据库及实体类

create table Users
(
Id ,) primary key,
Name nvarchar() not null,
Password nvarchar() not null,
Email nvarchar(),
Address nvarchar()
)
　　

    public class Users
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Password { get; set; }
        public string Email { get; set; }
        public string Address { get; set; }
    }

1.安装dapper，并引入命名空间

2.增

//单条插入
IDbConnection conn = new SqlConnection(connStr);
Users users = new Users()
{
    Address = "zhongguo",
    Email = "zhongguo@qq.com",
    Name = "zg",
    Password="
};
int result1 = conn.Execute("insert into users (Name,Password,Email,Address) values(@Name,@Password,@Email,@Address)", users);

//批量插入
List<Users> list = new List<Users>
{
    "},
    "},
    "},
    "}
};
int result2 = conn.Execute("insert into users (Name,Password,Email,Address) values(@Name,@Password,@Email,@Address)", list);

3.删

IDbConnection conn = new SqlConnection(connStr);
 });

4.改

IDbConnection conn = new SqlConnection(connStr);
int result = conn.Execute("update users set Name=@Name", new { Name = "newName" });

5.查

IDbConnection conn = new SqlConnection(connStr);
//查询单条
Users user = conn.QueryFirstOrDefault<Users>("select * from users where Name=@Name", new { Name = "bj" });

//查询多个
var list1 = conn.Query<Users>("select * from users where Name=@Name", new { Name = "bj" });

//in方式查询
, ,  };
var list2 = conn.Query<Users>("select * from users where id in @id", new { id = ids });

//一次执行多条查询语句,可以是不同的表
var reader = conn.QueryMultiple("select * from users where id>=5;select * from users where id<5");
var list3 = reader.Read<Users>();
var list4 = reader.Read<Users>();