Dapper是什么?
Dapper是一款.Net平台簡單(Simple)的對象映射庫,並且Dapper擁有着“微型ORM之王”的稱號。
就速度而言與手寫ADO.NET SqlDateReader相同。
ORM是Object Relational Mapper的縮寫,代表着數據庫與編程語言之間的映射。
簡單來說就是使用Entity Framework、NHibernate 來處理大數據訪問及關系映射,未免有點殺雞用牛刀,那么Dapper會是不錯的選擇。
1、Dapper基本用法
通過NuGet安裝:Dapper包,如果要進行mysql連接還需要安裝Mysql.Data包
2、數據庫連接配置
<connectionStrings>
<add name="MysqlServer" connectionString="Database=用數據庫名稱;Data Source=IP;Port=端口; User Id=用戶名;Password=密碼;Charset=utf8mb4;TreatTinyAsBoolean=false;" /> //Mysql
<add name="LinqConnection" connectionString="Data Source=IP;Initial Catalog=數據庫名稱; User ID=用戶名;Password=密碼" providerName="System.Data.SqlClient"/> //sql
</connectionStrings>
3、dapper 數據庫連接方法
Mysql連接方法:
public class DapperService
{
public static MySqlConnection MySqlConnection()
{
string mysqlConnectionStr = ConfigurationManager.ConnectionStrings["MysqlServer"].ToString();
var connection = new MySqlConnection(mysqlConnectionStr); connection.Open();
return connection;
}
}
mssql連接方法:
public class DapperService {
public static SqlConnection MySqlConnection()
{
string mysqlConnectionStr =ConfigurationManager.ConnectionStrings["LinqConnection"].ToString();
var connection = new SqlConnection(mysqlConnectionStr);
connection.Open();
return connection;
}
}
4、新增方法(單體、批量)
單體:
public ActionResult GetDapper(CarModel carModel)
{
try
{
using (IDbConnection conn = DapperService.MySqlConnection())
{
int result = conn.Execute("insert into UserInfo(UserTel,UserName,UserPwd) values (@UserTel,@UserName,@UserPwd)", carModel);
}
return Json("success");
}
catch(Exception e)
{
return Json("failed");
}
}
批量:
public ActionResult GetDapper(List<CarModel> carModel)
{
try
{
using (IDbConnection conn = DapperService.MySqlConnection())
{
int result = conn.Execute("insert into UserInfo(UserTel,UserName,UserPwd) values(@UserTel,@UserName,@UserPwd)", carModel);
}
return Json("success");
}
catch(Exception e)
{
return Json("failed");
}
}
5、刪除方法(單體、批量)
單體:
public static int Delete(CarModel carModel)
{ using (IDbConnection conn = DapperService.MySqlConnection()) { return conn.Execute("delete from UserInfo where id=@ID", carModel); } }
批量:
public static int Delete(List<CarModel> carModel) { using (IDbConnection conn = DapperService.MySqlConnection()) { return conn.Execute("delete from UserInfo where id=@ID", carModel); } }
6、更新方法(單體、批量)
單體:
public static int Update(CarModel carModel) { using (IDbConnection conn = DapperService.MySqlConnection()) { return conn.Execute("update UserInfo set name=@name where id=@ID", carModel); } }
批量:
public static int Update(List<CarModel> carModel) { using (IDbConnection conn = DapperService.MySqlConnection()) { return conn.Execute("update UserInfo set name=@name where id=@ID", carModel); } }
7、查詢
無參查詢
public static List<CarModel> Query() { using (IDbConnection conn = DapperService.MySqlConnection()) {
return conn.Query<CarModel>("select * from UserInfo ").ToList();
} }
有參查詢
public static Person Query(CarModel carModel) { using (IDbConnection conn = DapperService.MySqlConnection()) { return conn.Query<CarModel>("select * from UserInfo where id=@ID",carModel).SingleOrDefault(); } }
8、Dapper的復雜操作
In操作
public static List<CarModel> QueryIn() { using (IDbConnection conn = DapperService.MySqlConnection()) { var sql = "select * from UserInfo where id in @ids"; return conn.Query<CarModel>(sql, new { ids = new int[2] { 1, 2 }, }).ToList(); } }
public static List<CarModel> QueryIn(int[] ids) { using (IDbConnection conn = DapperService.MySqlConnection()) { var sql = "select * from UserInfo where id in @ids"; return conn.Query<CarModel>(sql, new { ids }).ToList(); } }
9、多語句操作
public ActionResult QueryMultiple() { try { using (IDbConnection conn = DapperService.MySqlConnection()) { var sql= "select * from Person; select * from UserInfo"; var multiReader = conn.QueryMultiple(sql); var personList = multiReader.Read<Person>(); var bookList = multiReader.Read<CarModel>(); multiReader.Dispose(); } return Json("success"); } catch(Exception e) { return Json("failed"); } }