【MySQL学习01】通过JDBC连接MySQL

sql 文件

CREATE DATAbase `jdbcStudy` CHARACTER SET utf8 COLLATE utf8_general_ci;

USE `jdbcStudy`;

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,'Yoimiya','123456','xiaogong@sina.com','2000-11-24'),
(2,'Xiao','123456','xiao@sina.com','2000-10-24'),
(3,'Fischl','123456','feixieer@sina.com','2000-09-27')

下载JDBC所需jar包，mysql-connector-java-5.1.47（MySQL版本5.7.19），在项目目录下创建lib文件夹，剪切mysql-connector-java-5.1.47.jar到 lib 目录下，右键 lib ，Add as Library。

连接MySQL具体代码实现（查询操作）：

package com.hammer.com;

import java.sql.*;

public class TestJDBC {

    public static void main(String[] args) throws ClassNotFoundException, SQLException {

        //1.加载驱动(抛异常)
        Class.forName("com.mysql.jdbc.Driver");

        //用户信息和url                               数据库名
        String url = "jdbc:mysql://localhost:3306/jdbcstudy?useUnicode=true&characterEncoding=utf8&useSSL=true";
        String username = "root";
        String password = "123456";

        //2.连接成功，数据库对象(抛异常)
        Connection connection = DriverManager.getConnection(url, username, password);

        //3.获取执行SQL对象
        Statement statement = connection.createStatement();

        //4.执行SQL的对象去执行SQL，可能存在结果，查看返回结果
        String sql = "SELECt * FROM users";
        //返回的结果集，结果集中封装了全部的查询结果
        ResultSet resultSet = statement.executeQuery(sql);

        while(resultSet.next()){  //移动到下一个数据
            System.out.println("id = " + resultSet.getObject("id"));
            System.out.println("name = " + resultSet.getObject("name"));
            System.out.println("pwd = " + resultSet.getObject("password"));
            System.out.println("email = " + resultSet.getObject("email"));
            System.out.println("birth = " + resultSet.getObject("birthday"));
            System.out.println("----------------------------------------------");
        }

        //5.释放资源
        resultSet.close();
        statement.close();
        connection.close();
    }
}

Statement接口方法

//执行SQL查询语句，返回查询结果集，封装全部查询结果
ResultSet executeQuery(String sql) throws SQLException;
//执行SQL增(INSERT)、删(DELETE)、改(UPDATE)语句，返回受影响的行数
int executeUpdate(String sql) throws SQLException;