JDBC链接数据库

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

/**
 *JDBC快速入门
 */
public class JDBCDemo {
    public static void main(String[] args) throws Exception{
        //1.注册驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2.获取链接对象
        String url = "jdbc:mysql://127.0.0.1:3306/db1?useSSL=false";
        String username = "root";
        String password = "123456";
        Connection conn = DriverManager.getConnection(url,username,password);
        //3.定义SQL
        String sql = "update emp set salary = 2000 where id = 7";

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

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

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

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