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SpringBoot整合Mybatis-plus的具体过程使用

作者：鸣鼓ming　　发布时间：2022-06-15 19:38:52　

标签：SpringBoot,mybatis-plus,mybatis

1.MyBatisX插件

在使用mybatis或者mybatis-plus时,我们可以安装IDEA的MyBatis的插件 - MyBatisX,

这样我们就可以实现点击接口跳转到sql文件, 点击sql文件可以跳转到接口的功能, 很方便.这个插件的功能还有很多, 可以查看MyBatis-Plus官网

安装方法：打开 IDEA，进入 File -> Settings -> Plugins -> Browse Repositories，输入 mybatisx 搜索并安装, 然后重启IDEA。

点击小鸟可实现跳转

2.引入依赖

在pom.xml添加如下依赖

<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.17</version>
</dependency>

3.编写配置

application.properties

server.port=8080
spring.datasource.url=jdbc:mysql://localhost:3306/db_springtest?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#----------------------------配置mybatis-plus---------------------------
#配置sql文件路径
mybatis-plus.mapper-locations=classpath:/mapper/*.xml
#开启驼峰命名映射
mybatis-plus.configuration.map-underscore-to-camel-case=true
## 自定义sql中表名带前缀, 默认是实体名的小写, 如user, 但是数据库中是t_user, 所以设置加上前缀
mybatis-plus.global-config.db-config.table-prefix=t_
#----------------------------配置druid--------------------------------
#监控SpringBean
spring.datasource.druid.aop-patterns=com.limi.springboottest2.*
# 底层开启功能，stat（sql监控），wall（防火墙）
spring.datasource.druid.filters=stat,wall
# 配置监控页功能
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123456
spring.datasource.druid.stat-view-servlet.reset-enable=false
# 监控web
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions='*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'
# 对上面filters里面的stat的详细配置
spring.datasource.druid.filter.stat.slow-sql-millis=1000
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.config.drop-table-allow=false

4.编写接口

UserMapper

package com.limi.springboottest2.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.limi.springboottest2.entity.User;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper extends BaseMapper<User> {
User getUserById(Integer id);
}

UserMapper.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.limi.springboottest2.mapper.UserMapper">
<select id="getUserById" resultType="com.limi.springboottest2.entity.User">
select * from t_user where id = #{id}
</select>
</mapper>

注意要开启mapper接口文件的扫描

SpringbootTest2Application

package com.limi.springboottest2;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
@MapperScan("com.limi.springboottest2.mapper")//扫描mapper
public class SpringbootTest2Application {
public static void main(String[] args) {
//1、返回我们IOC容器
ConfigurableApplicationContext run = SpringApplication.run(SpringbootTest2Application.class, args);
}
}

5.运行测试

HelloController

package com.limi.springboottest2.controller;
import com.limi.springboottest2.entity.User;
import com.limi.springboottest2.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class HelloController {
@Autowired
private UserMapper userMapper;
//测试自己编写sql语句的查询方法
@ResponseBody
@GetMapping("/getUser/{id}")
public User test1(@PathVariable("id") Integer id){
User user = userMapper.getUserById(id);
return user;
}
//测试mybatis-plus内置的查询方法
@ResponseBody
@GetMapping("/getAllUser")
public List<User> test2(){
List<User> userList = userMapper.selectList(null);//查询所有
return userList;
}
}

6.完整代码

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>2.7.0</version>
<relativePath/> 
</parent>
<groupId>com.limi</groupId>
<artifactId>springboot-test2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-test2</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</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>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>

<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.17</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>

<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>