什么是JDBC：Java连接数据库

需要jar包支持：

• java.sql
• javax.sql
• mysql-connector-java…连接驱动

实验环境搭建

CREATE TABLE users(
    id INT PRIMARY KEY,
    `name` VARCHAR(40),
    `password` VARCHAR(40),
    email VARCHAR(60),
    birthday DATE
);

INSERT INTO users(id,`name`,`password`,email,birthday)
VALUES(1,'张三','123456','zs@qq.com','2000-01-01');
INSERT INTO users(id,`name`,`password`,email,birthday)
VALUES(2,'李四','123456','ls@qq.com','2000-01-01');
INSERT INTO users(id,`name`,`password`,email,birthday)
VALUES(3,'王五','123456','ww@qq.com','2000-01-01');


SELECT	* FROM users;

导入数据库依赖

<dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
    </dependencies>

IDEA中连接数据库

JDBC固定六部曲

1. 加载驱动
2. 连接数据库，代表数据库
3. 向数据库发送SQL的对象Statement：CRUD
4. 编写SQL（根据业务不同的SQL）
5. 执行SQL
6. 关闭连接

package com.yang.test;

import java.sql.*;

public class TestJdbc {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //配置信息
        //useUnicode=true&characterEncoding=utf-8解决中文乱码问题
        String url = "jdbc:mysql://localhost:3308/jdbc?useSSL=false&useUnicode=true&characterEncoding=utf-8";
        String username = "root";
        String password = "123456";
        //1.加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2.连接数据库
        Connection connection = DriverManager.getConnection(url, username, password);
        //3.向数据库发送SQL的对象statement:CRUD
        Statement statement = connection.createStatement();
        //4.编写SQL
        String sql = "select * from users";
        //5.执行查询SQL
        ResultSet rs = statement.executeQuery(sql);
        while (rs.next()){
            System.out.println("id="+rs.getObject("id"));
            System.out.println("name="+rs.getObject("name"));
            System.out.println("password="+rs.getObject("password"));
            System.out.println("email="+rs.getObject("email"));
            System.out.println("birthday="+rs.getObject("birthday"));
        }
        //6.关闭连接，释放资源（一定要做）
        rs.close();
        statement.close();
        connection.close();
    }
}