Java框架搭建(mybatis plus)

深碍√TFBOYSˉ_ 2023-10-06 21:37 42阅读 0赞

### mybatis plus ###

1.  添加依赖

<dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.4.2</version>
    </dependency>

**2.删掉**application.yml中的mybatis，加上mybatis plus

# mybatis-plus配置
    mybatis-plus:
      configuration:
        log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
      typeAliasesPackage: com.qcby.demo.entity
      mapperLocations: classpath:mapper/*.xml
    #  全局配置id自增
      global-config:
        db-config:
          id-type: auto

3.在demo下建立config并建立MybatisPlusConfig类

package com.qcby.demo.config;
    
    import com.baomidou.mybatisplus.annotation.DbType;
    import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
    import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    //启动的移过来
    @MapperScan("com.qcby.demo.mapper")
    @Configuration
    public class MybatisPlusConfig {
        // 最新版
        @Bean  // <bean id=""/>
        public MybatisPlusInterceptor mybatisPlusInterceptor() {
            MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
            interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
            return interceptor;
        }
    }

4.测试跟分页

package com.qcby.demo.controller;
    
    
    import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
    import com.baomidou.mybatisplus.core.metadata.IPage;
    import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
    import com.qcby.demo.entity.User;
    import com.qcby.demo.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.util.StringUtils;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    @RestController
    @RequestMapping("user")
    public class UserController {
        @Autowired
        private UserService userService;
    
        @RequestMapping("listAll")
        public List<User> listAll(){
            return userService.listAll();
        }
    
        @RequestMapping("listAll1")
        public  List<User> listAll1(){
            return userService.list();
        }
        @RequestMapping("listPage")
        public IPage listPage(int pageNo,int pageSize,User user){
            Page<User> page = new Page<>(pageNo,pageSize);
    
    
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    
            if(!StringUtils.isEmpty(user.getUsername())){
                    queryWrapper.like("username",user.getUsername());
            }
            IPage<User> pageInfo = userService.page(page);
            return pageInfo;
        }
    
    
    }