JavaEE--小Demo--数据库建立

//demo.sql

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
          `user_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '用户id',
          `user_name` varchar(50) NOT NULL COMMENT '用户名称',
          `password` varchar(50) NOT NULL COMMENT '密码',
          `nick_name` varchar(50) NOT NULL COMMENT '昵称',
          `locked` tinyint(4) DEFAULT '0' COMMENT '是否锁定 0未锁定 1已锁定无法登陆',
           PRIMARY KEY (`user_id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC;
/*
*使用InnoDB存储引擎，b树结构存储
*/
LOCK TABLES `user` WRITE;
INSERT INTO `user` (`user_id`, `user_name`, `password`, `nick_name`, `locked`)
VALUES
    (1,'admin1','1111','小小媛',0),
    (2,'admin2','1111','小媛儿',0),
    (3,'admin3','1111','小橘儿',0);

UNLOCK TABLES;
/*解锁*/

2.打开此目录，并运行命令提示符

3.打开数据库mysql -uroot -p

4.创建数据库create database demo;

5.使用数据库use demo;

6.导入数据source demo.sql;

7.查看表信息select * from user;

step2-User.java

1.在entity目录下新建User.java文件

java 复制代码

//User.java

package edu.xaufe.demo.entity;
import lombok.Data;
@Data
public class User {
    private long user_id;
    private String user_name;
    private String password;
    private String nick_name;
    private Byte locked;
}

注：此处会发生Data报错

2.导入lombok:1.18.16

如下代码粘贴在demo-target-pom.xml-?-</dependencies>

java 复制代码

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
            <scope>provided</scope>
        </dependency>

step3-UserMapper.java

新建dao文件夹，新建UserMapper.java文件

java 复制代码

//UserMapper.java

package edu.xaufe.demo.dao;
import edu.xaufe.demo.entity.User;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    int insert(User record);

    int insertSelective(User record);

    /**
     * 登陆方法
     *
     * @param userName
     * @param password
     * @return
     */
    User login(@Param("userName") String userName, @Param("password") String password);

    User selectByPrimaryKey(Long adminUserId);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
}

以上所有步骤源文件代码来自emall同结构异名目录下