系统环境：
操作系统: win10
jdk版本:
openjdk version "12" 2019-03-19 OpenJDK Runtime Environment (build 12+33) OpenJDK 64-Bit Server VM (build 12+33, mixed mode, sharing)
idea版本：
IntelliJ IDEA 2020.2.1 (Ultimate Edition) Build #IU-202.6948.69, built on August 25, 2020 Licensed to hello Subscription is active until September 11, 2021 For educational use only. Runtime version: 11.0.8+10-b944.31 amd64 VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o. Windows 10 10.0 GC: ParNew, ConcurrentMarkSweep Memory: 966M Cores: 8 Non-Bundled Plugins: Lombook Plugin, com.intellij.kubernetes, training
maven版本：3.6.3
- 项目结构如下：
-
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>mybatisdemo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>mybatisdemo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>14</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.3</version> </dependency> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-core</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <!-- <scope>runtime</scope>--> <version>8.0.16</version> </dependency> <!-- mp--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.0</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <version>3.4.0</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
-
application.yml
spring: # profiles: # active: dev datasource: username: root password: capgemini@123 url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC driver-class-name: com.mysql.cj.jdbc.Driver server: port: 8080 mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.example.mybatisdemo.entity configuration: map-underscore-to-camel-case: true # Logger Config logging: level: com.baomidou.mybatisplus.samples: debug com.example.mybatisdemo: debug
-
mapper.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.example.mybatisdemo.dao.UserMapper"> <!-- 通用查询映射结果 --> <resultMap id="BaseResultMap" type="com.example.mybatisdemo.entity.User"> <result column="id" property="id" /> <result column="name" property="name" /> </resultMap> <sql id="tName"> user </sql> <!-- 通用查询结果列 --> <sql id="Base_Column_List"> id, name </sql> <select id="getOne" resultMap="BaseResultMap"> SELECT <include refid="Base_Column_List"></include> FROM user WHERE id=#{id} </select> <select id="getFirst" resultMap="BaseResultMap"> SELECT <include refid="Base_Column_List"></include> FROM user <where> <if test="name!=null"> ,`name`=#{name} </if> </where> LIMIT 1 </select> <insert id="saveNotExist" useGeneratedKeys="true" keyProperty="id"> INSERT INTO user (`name`) VALUES (#{name}) </insert> <update id="saveExist"> UPDATE user <set> <if test="name!=null"> ,name=#{name} </if> ,id=#{id} </set> WHERE id=#{id} </update> <delete id="deleteOne" parameterType="long"> DELETE FROM user WHERE id=#{id} </delete> </mapper>
-
dao
package com.example.mybatisdemo.dao; import com.example.mybatisdemo.entity.User; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import org.apache.ibatis.annotations.Options; import org.springframework.stereotype.Repository; /** * <p> * Mapper 接口 * </p>*/ @Repository public interface UserMapper extends BaseMapper<User> { @Override @Options(useGeneratedKeys = true, keyProperty = "id") int insert(User entity); User getOne(User entity); int saveNotExist(User entity); int saveExist(User entity); int deleteOne(Long id); User getFirst(User entity); }
-
单元测试 (注意：如果想让单元测试自动回滚，请在方法上添加注解 @Transactional(rollbackFor = {Exception.class})
package com.example.mybatisdemo; import com.example.mybatisdemo.dao.UserMapper; import com.example.mybatisdemo.entity.User; import lombok.extern.slf4j.Slf4j; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.util.Assert; @SpringBootTest @Slf4j class MybatisdemoApplicationTests { @Test void contextLoads() { } @Autowired private UserMapper userMapper; @Test void queryOneTest(){ User u = userMapper.selectById(2L); Assert.notNull(u,"cannot find row!"); log.info(u.getName()); } @Test void insertOneTest(){ User u = new User(); u.setName("王一"); userMapper.insert(u); Assert.notNull(u.getId(),"id已回写"); log.info(u.getId().toString()); } @Test void TestGetOne(){ User user = new User(); user.setId(2L); Assert.isTrue(userMapper.getOne(user).getName().equals("王一"),"getUser:id=2L,name=王一"); } @Test void TestSaveNotExist(){ User user = new User(); user.setName("自定义添加"); userMapper.saveNotExist(user); Assert.notNull(user.getId(),"id回写"+user.getId()); } @Test void TestSaveExist(){ User user = new User(); user.setId(1L); user.setName("第一条数据,已更新2"); userMapper.saveExist(user); User u = userMapper.getOne(user); Assert.isTrue(u.getName().equals("第一条数据,已更新2"),"是第一条没错了"); } @Test void TestSaveExistEmpty(){ User user = new User(); user.setId(1L); userMapper.saveExist(user); User u = userMapper.getOne(user); log.info(u.toString()); } @Test void TestDeleteOne(){ User u = userMapper.getFirst(new User()); Assert.notNull(u.getId(),"非空"); Assert.isTrue(userMapper.deleteOne(u.getId())>0,"删除失败"); } }
7. 建表语句
-- -------------------------------------------------------- -- 主机: 127.0.0.1 -- 服务器版本: 8.0.21 - MySQL Community Server - GPL -- 服务器操作系统: Win64 -- HeidiSQL 版本: 11.0.0.5919 -- -------------------------------------------------------- /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */; /*!40101 SET NAMES utf8 */; /*!50503 SET NAMES utf8mb4 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */; -- 导出 表 test.role 结构 DROP TABLE IF EXISTS `role`; CREATE TABLE IF NOT EXISTS `role` ( `id` bigint NOT NULL AUTO_INCREMENT, `name` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL DEFAULT '', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; -- 数据导出被取消选择。 -- 导出 表 test.user 结构 DROP TABLE IF EXISTS `user`; CREATE TABLE IF NOT EXISTS `user` ( `id` bigint NOT NULL AUTO_INCREMENT, `name` varchar(50) NOT NULL DEFAULT '', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; -- 数据导出被取消选择。 -- 导出 表 test.user_role 结构 DROP TABLE IF EXISTS `user_role`; CREATE TABLE IF NOT EXISTS `user_role` ( `rid` bigint NOT NULL, `uid` bigint NOT NULL, KEY `FK_user_role_role` (`rid`), KEY `FK_user_role_user` (`uid`), CONSTRAINT `FK_user_role_role` FOREIGN KEY (`rid`) REFERENCES `role` (`id`) ON DELETE CASCADE, CONSTRAINT `FK_user_role_user` FOREIGN KEY (`uid`) REFERENCES `user` (`id`) ON DELETE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; -- 数据导出被取消选择。 /*!40101 SET SQL_MODE=IFNULL(@OLD_SQL_MODE, '') */; /*!40014 SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS IS NULL, 1, @OLD_FOREIGN_KEY_CHECKS) */; /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;