JDBC数据库连接

1. • 下载jdbc jar包，中央仓库下载

https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.24

2. • 项目导入

右键jar包，然后add as library

3. • 数据库操作

3.1连接数据库

package com.heima.jdbc;

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

public class JDBCDemo {
    public static void main(String[] args) throws Exception
    {
        // 1.注册驱动，目前已经不需要注册驱动，驱动默认加载
        // Class.forName("com.mysql.jdbc.Driver");
        // 2.获取连接
        String url = "jdbc:mysql://127.0.0.1:3306/db1";
        String username = "root";
        String password = "hexiong";
        Connection conn = DriverManager.getConnection(url, username, password);
        // 3.定义sql
        String sql = "update account set money = 2000 where id = 1";

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