springboot整合mybatics PLUS

　　首先添加maven依赖：　　

　　<dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus</artifactId>
      <version>2.1.6</version>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatisplus-spring-boot-starter</artifactId>
      <version>1.0.5</version>
    </dependency>

　　application.yml配置：

mybatis-plus:
  mapper-locations: classpath:/mapper/*Mapper.xml
  typeAliasesPackage: com.itmayiedu.entity
  global-config:
    id-type: 0
    field-strategy: 2
    ##允许下划线
    db-column-underline: true
    ##允许大写
    capital-mode: true
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: false
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #打印sql语句,调试用

　　添加MybaticsConfig:

　　

package com.itmayiedu.config;

import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyBatisConfig {

//    /**
//     * mybatis-plus SQL执行效率插件【生产环境可以关闭】
//     */
//    @Bean
//    public PerformanceInterceptor performanceInterceptor() {
//        return new PerformanceInterceptor();
//    }

    /**
     * 分页插件
     *
     * @return
     * @author zhaocheng
     * @date 2018年4月14日下午4:13:15
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        paginationInterceptor.setLocalPage(true);// 开启 PageHelper 的支持,也可以关闭，plus自带分页

        return paginationInterceptor;
    }

}

　　编写dao层，RoleMapper：

package com.itmayiedu.mapper;

import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.itmayiedu.entity.Role;

public interface RoleMapper extends BaseMapper<Role> {
}

　　编写service层：

　　RoleService

package com.itmayiedu.service;

import com.baomidou.mybatisplus.service.IService;
import com.itmayiedu.entity.Role;

public interface RoleService extends IService<Role> {
}

　　RoleServiceImpl

package com.itmayiedu.service.Impl;

import com.baomidou.mybatisplus.service.impl.ServiceImpl;
import com.itmayiedu.entity.Role;
import com.itmayiedu.mapper.RoleMapper;
import com.itmayiedu.service.RoleService;
import org.springframework.stereotype.Service;

@Service
public class RoleServiceImpl extends ServiceImpl<RoleMapper, Role> implements RoleService {
}

　　controller:

package com.itmayiedu.controller;

import com.baomidou.mybatisplus.mapper.EntityWrapper;
import com.baomidou.mybatisplus.plugins.Page;
import com.baomidou.mybatisplus.plugins.pagination.PageHelper;
import com.itmayiedu.entity.Role;
import com.itmayiedu.entity.User;
import com.itmayiedu.service.RoleService;
import com.itmayiedu.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@Slf4j
public class TestController {

    @Autowired
    private UserService userService;

    @Autowired
    private RoleService roleService;

    @RequestMapping("/testString")
    public String testString(){
        log.info("testString");
        return "springboot01 test";
    }

    @Transactional
    @RequestMapping("/insert")
    public Integer insertRole(String role_name,String note){
        Integer a = userService.insertRole(role_name, note);
        int b = 100/Integer.valueOf(note);
       return a;
    }

    //使用mybaticsPLUS分页
    @RequestMapping("/testSql")
    public void testSql(String name){
        EntityWrapper<Role> ew = new EntityWrapper<Role>();
        Page<Role> page = new Page<>(1, 2);
        ew.andNew("note="+name);
        Page<Role> userPage = roleService.selectPage(page, ew);
        for(Role role:userPage.getRecords()){
            log.info(role.getRole_name());
        }
        System.out.println(ew.getSqlSegment());
    }

    //使用PageHelper分页
    @RequestMapping("/testPage")
    public void testPage(String name){
//        Page page = PageHelper.startPage(size, 2);
        PageHelper.startPage(1, 2);
        EntityWrapper<Role> ew = new EntityWrapper<Role>();
        ew.andNew("note="+name);
        List<Role> data = roleService.selectList(ew);
        for(Role role:data){
            log.info(role.getRole_name());
        }
    }
}