轻量级ORM框架Dapper应用之返回多个结果集_实用技巧_

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Configuration; using Dapper; using System.Data; using System.Data.SqlClient; using DapperAppQueryMultiple.Model; namespace DapperAppQueryMultiple { class Program { static void Main(string[] args) { // 定义连接字符串 string conn = ConfigurationManager.ConnectionStrings["AppConnection"].ConnectionString; using (IDbConnection connection = new SqlConnection(conn)) { var sql = @"SELECT * FROM Users WHERE UserId=@UserId; SELECT * FROM Product WHERE ProductId=@ProductId"; var queryMulti = connection.QueryMultiple(sql, new { UserId = 1, ProductId=3 }); // 注意：Read获取的时候必须是按照上面返回表的顺序 比如上面先查询的Users表，那么Read的时候必须先返回Users表，否则返回没有数据 var users = queryMulti.Read(); var products = queryMulti.Read(); Console.WriteLine("*****产品信息*****"); // 循环遍历输出 products.AsList().ForEach(p => { Console.WriteLine("产品名称:"+p.ProductName+" 价格:"+p.Price); }); Console.WriteLine("*****产品信息*****"); Console.WriteLine("*****用户信息*****"); users.AsList().ForEach(p => { Console.WriteLine("用户姓名:"+p.UserName+" 邮箱:"+p.Email+" 地址:"+p.Address); }); Console.WriteLine("*****用户信息*****"); } Console.ReadKey(); } } }

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Configuration; using Dapper; using System.Data; using System.Data.SqlClient; using DapperAppQueryMultiple.Model; namespace DapperAppQueryMultiple { class Program { static void Main(string[] args) { // 定义连接字符串 string conn = ConfigurationManager.ConnectionStrings["AppConnection"].ConnectionString; using (IDbConnection connection = new SqlConnection(conn)) { var sql = @"SELECT * FROM Users WHERE UserId=@UserId; SELECT * FROM Product WHERE ProductId=@ProductId"; var queryMulti = connection.QueryMultiple(sql, new { UserId = 1, ProductId=3 }); // 先返回Product表的查询数据 var products = queryMulti.Read(); var users = queryMulti.Read(); Console.WriteLine("*****产品信息*****"); // 循环遍历输出 products.AsList().ForEach(p => { Console.WriteLine("产品名称:"+p.ProductName+" 价格:"+p.Price); }); Console.WriteLine("*****产品信息*****"); Console.WriteLine("*****用户信息*****"); users.AsList().ForEach(p => { Console.WriteLine("用户姓名:"+p.UserName+" 邮箱:"+p.Email+" 地址:"+p.Address); }); Console.WriteLine("*****用户信息*****"); } Console.ReadKey(); } } }