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  • c# 对数据库的操作

    1.首先需要引用

    using System.Data.SqlClient;

    2.创建连接

    SqlConnection connection = new SqlConnection();
    connection.ConnectionString = "Data Source= IP地址; Initial Catalog = 数据库名称; User ID = 数据库用户名; Password=密码";
    connection.Open(); //开启连接

    3.执行操作

    数据库表名称:Test 参数:ID(主键),Name,Age

     //添加数据
    private void button1_Click(object sender, EventArgs e)
    {
        SqlCommand command = new SqlCommand("insert into Test(ID,Name,Age) values (2,'王五','23')", connection);
        command.ExecuteNonQuery();  //执行指令并返回影响行数
    }
    //修改数据
    private void button2_Click(object sender, EventArgs e)
    {
        SqlCommand command = new SqlCommand("update Test set Name = '哎呦',Age = '100' where ID=1",connection);
        command.ExecuteNonQuery();
    }
    //删除数据
    private void button3_Click(object sender, EventArgs e)
    {
       SqlCommand command = new SqlCommand("delete Test where ID = 1",connection);
       command.ExecuteNonQuery();
    }

     4.读取数据

    SqlDataReader reader = command.ExecuteReader();
    if (reader.HasRows)   //判断是否有数据
    { while (reader.Read()) { MessageBox.show(reader[0].toString()); } }
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  • 原文地址:https://www.cnblogs.com/lihaibo-Leao/p/3142089.html
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