JBDC入门

public class JDBCDemo {
    public static void main(String[] args) throws Exception{
        //1.注册驱动
        Class.forName("com.mysql.jdbc.Driver");

        //2.获取链接
        String url = "jdbc:mysql://127.0.0.1:3306/db1";
        String username = "root";
        String password = "1234";
        Connection conn = DriverManager.getConnection(url,username,password);//返回值

        //3.定义sql语句;
        String sql = "update account set money = 2000 where id = 1;";

        //4.获取执行sql的对象 Statement
        Statement stmt = conn.createStatement();

        //5.执行sql
        int count = stmt.executeUpdate(sql);//受影响的行数

        //6.处理结果
        System.out.println(count);

        //7.释放资源
        stmt.close();
        conn.close();
    }
}