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

c# 对数据库的操作

 //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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