轻量级ORM框架第二篇（Dapper） _轻量级

少年恃险若平地，独倚长剑凌清秋。这篇文章主要讲述轻量级ORM框架第二篇：Dapper相关的知识，希望能为你提供帮助。
1. in操作

IDbConnection connection = new SqlConnection("Data Source=.; Initial Catalog=DapperTest; Integrated Security=True; MultipleActiveResultSets=True"); var sql = "select * from Users where Email in @emails"; var info = connection.Query< Users> (sql, new { emails = new string[2] { "1QQ", "7QQ" } });

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2. 多条sql执行

IDbConnection connection = new SqlConnection("Data Source=.; Initial Catalog=DapperTest; Integrated Security=True; MultipleActiveResultSets=True"); var sql = "select * from Product; select * from Users"; var multiReader = connection.QueryMultiple(sql); var productList = multiReader.Read< Product> (); var userList = multiReader.Read< Users> (); multiReader.Dispose();

【轻量级ORM框架第二篇（Dapper）】3.多表join操作

var sql = @"selectp.ProductName,p.CreateTime,u.UserName from Product as p join Users as u on p.UserID = u.UserID where p.CreateTime > \'2019-1-1\'; "; var result = connection.Query< Product, Users,Product> (sql, (product, users) => { product.UsersOwner = users; return product; },splitOn:"UserName");

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4.支持存储过程

use DapperTest set ansI_nulls on go set quoted_identifier on go create proc [dbo].[sp_GetUsers] @id int as begin select * from Users where UserID = @id ; end