www.ctrt.net > C#用 EF怎么执行sql语句

C#用 EF怎么执行sql语句

using (MyObjectContext db = new MyObjectContext() ){ string sql = “ select columnA, columnB from TableA where 1 = 1 ”; db.ExecuteStoreQuery(sql).ToList();//TableAObject就是你定义的对象,对象属性就是columnA, columnB}

C#中执行SQL语句 //SQL查询语句 public DataTable query(string sql) { //server=127.0.0.1; DataTable dt=new DataTable(); //DataRow dr; string connString = "server=127.0.0.1;uid=sa;pwd=;database=TJPTTC"; SqlConnection conn = new Sql...

string connString = "Data Source= .;Initial Catalog=……"; SqlConnection connection = new SqlConnection(connString); string sql2 = "SQL语句1;SQL语句2"; // 两个SQL语句之间用分号隔开 SqlCommand command = new SqlCommand(sql2, connec...

一个示例:创建Employee类的新对象,用适当的值填充,然后添加这个新对象到Employee集合,提交变化到数据库作为Employee表的新行。注意,主键EmployeeID是自动增值(可查看dbml代码),创建新对象时不用设置主键值。 NorthwndDataContext db = n...

这一条语句:string sqlStr = @"SELECT a.name, b.rows FROM sysobjects AS a INNER JOIN sysindexes AS b ON a.id = b.id WHERE (a.type = 'u') AND (b.indid IN (0, 1)) AND rows > av ORDER BY b.rows DESC"; 改为: string sqlStr = @"SELEC...

public static string connectionString = "Data Source=**;Initial Catalog=**;Persist Security Info=True;User ID=**;Password=**"; //数据库连接字符串 以下是一个返回DataSet的方法 public DataSet get_accounts(string login_id, string b...

加两个命名空间: using System.Data; using System.Data.SqlClient; 代码给你个简单的例子: SqlConnection con = new SqlConnection("Data Source=N1;Initial Catalog=MyData;User ID=sa;Password=sa"); SqlCommand cm = new SqlCommand(sql, ...

可以这样理解,你所写的SqlCommand和sql语句和数据库连接字符串这些,只代表了你告诉计算机要做哪些动作以及如何去做,但是当执行到ExecuteXXXX()功能的时候,计算机才真正的去实现你的要求。 就像这样,A对B说,你去楼下商店帮我买瓶可乐;当执...

对的,然后执行一下就行了,sqlcom.ExecuteNonQuery();

网站地图

All rights reserved Powered by www.ctrt.net

copyright ©right 2010-2021。
www.ctrt.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com