MyBatis-plus 入门实战：一、demo的搭建

MyBatis-plus 实战学习

#1.简单建一个springboot工程

#2.引入maven配置

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
           

#3.建几张简单的表

员工表
CREATE TABLE `t_emp`  (
  `id` int(11) NOT NULL,
  `age` int(11) NULL DEFAULT NULL,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) 

部门表
CREATE TABLE `t_depart`  (
  `id` int(11) NOT NULL,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `parent_id` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) 

员工和部门的关联表
CREATE TABLE `t_emp_depart`  (
  `id` int(11) NOT NULL,
  `emp_id` int(11) NULL DEFAULT NULL,
  `depart_id` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) 

           

#4.配置数据库连接，mybatis配置

#数据库配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis_demo?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=1234
#mybatis配置
mybatis-plus.mapper-locations=classpath:mapper/*.xml
mybatis-plus.global-config.db-config.id-type=auto