ADO.NET基础

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Data.SqlClient;

namespace ADONET基础 {

/// <summary>

/// Window1.xaml 的交互逻辑

/// </summary>

public partial class Window1 : Window

{

public Window1()

{

InitializeComponent();

}

private void button1_Click(object sender, RoutedEventArgs e)

{

////using() 自动关闭数据库，回收资源。

////SqlConnection为建立和数据库连接的对象。

//using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=myself;User Id=sa;Password=123;"))

//{

//    conn.Open();//打开连接

//    //通过连接，创建一个向数据库发命令的对象SqlCommand

//    using (SqlCommand cmd = conn.CreateCommand())//释放资源。

//    {

//        //CommandText为要执行的SQL的语句

//        cmd.CommandText = "Insert into student(学号,姓名) values(110,'张五')";

//        //ExecuteNonQuery一般用来执行Update Delete Insert 语句。

//        cmd.ExecuteNonQuery();//执行上面的SQL语句。

//    }

//}

using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=MyTest;User Id=sa;Password=123;"))

{

conn.Open();

using (SqlCommand cmd = conn.CreateCommand())

{

//cmd.CommandText = "select count(*) from student where 入学成绩<570";

//cmd.CommandText = "select count(*) from student where 入学成绩<570";

////ExecuteScalar一般用来执行有且只有一行一列返回值的SQL语句。

//int i = (int)cmd.ExecuteScalar();

//MessageBox.Show(i+"人成绩小于570分");

cmd.CommandText = "Insert into T_Student(Name,Age) output inserted.Id values('张顾',18);";

long i = (long)cmd.ExecuteScalar();

MessageBox.Show("Id为"+i);

}

}

MessageBox.Show("执行完成");

}

}

}