SpringBoot整合Mybatis-plus的具体过程使用

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

 
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.1
        
        
            mysql
            mysql-connector-java
            5.1.6
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.17

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 getUserById(Integer id);
}

UserMapper.xml

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 test2(){
        List userList = userMapper.selectList(null);//查询所有
        return userList;
    }
}

6.完整代码

pom.xml



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.7.0
         
    
    com.limi
    springboot-test2
    0.0.1-SNAPSHOT
    springboot-test2
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-devtools
            runtime
            true
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-configuration-processor
            true
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.1
        
        
            mysql
            mysql-connector-java
            5.1.6
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.17
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    
                        
                            org.projectlombok
                            lombok
                        
                    
                
            
            
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    
                        
                            org.springframework.boot
                            spring-boot-configuration-processor