MybatisPlus内置分页插件快速使用

た入场券 2023-09-27 13:14 150阅读 0赞

#### MybatisPlus内置分页插件快速使用 ####

*  1.创建配置类
 *  2.代码，实现条件分页查询
 *   *  1.controller
     *  2.service
     *  3.serviceImpl
     *  4.mapper
     *  5.xml
     *  6.测试

## 1.创建配置类 ##

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;
    
    @Configuration
    @MapperScan("mapper接口包")
    public class MybatisPlusConfig {
        
    
        @Bean
        public MybatisPlusInterceptor mybatisPlusInterceptor() {
        
            MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
            // 向Mybatis过滤器链中添加分页拦截器
            interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
            return interceptor;
        }
    }

## 2.代码，实现条件分页查询 ##

**本例子为根据含有的关键字查询**

### 1.controller ###

/**
     * 
     * @param page 当前页
     * @param limit 每页显示个数
     * @param sysRoleQueryVo 查询数据条件
     * @return 返回分页信息
     */ 	
    @GetMapping("/{page}/{limit}")
    public Result findPageQueryRole(@PathVariable long page,
                                        @PathVariable long limit,
                                        SysRoleQueryVo sysRoleQueryVo) {
        
         //创建page对象
         Page<SysRole> PageParam = new Page<>(page, limit);
         //调用service方法，获取分页信息
         IPage<SysRole> pageModel = sysRoleService.selectPage(PageParam, sysRoleQueryVo);
         //返回分页信息
         return Result.ok(pageModel);
        }

### 2.service ###

//条件分页查询
        IPage<SysRole> selectPage(Page<SysRole> pageParam, SysRoleQueryVo sysRoleQueryVo);

### 3.serviceImpl ###

//条件分页查询
        @Override
        public IPage<SysRole> selectPage(Page<SysRole> pageParam, SysRoleQueryVo sysRoleQueryVo) {
        
            IPage<SysRole> pageModel = baseMapper.selectPage(pageParam, sysRoleQueryVo);
            return pageModel;
        }

### 4.mapper ###

//条件分页查询
        IPage<SysRole> selectPage(Page<SysRole> pageParam, @Param("vo") SysRoleQueryVo sysRoleQueryVo);

### 5.xml ###

<resultMap id="RoleMap" type="com.atguigu.model.system.SysRole" autoMapping="true">
        </resultMap>
    
        
        <sql id="columns">
            id,role_name,role_code,description,create_time,update_time,is_deleted
        </sql>
    
        
        <select id="selectPage" resultMap="RoleMap">
            select <include refid="columns" /> from sys_role
            <where>
                <if test="vo.roleName != null and vo.roleName != ''">
                    and role_name like CONCAT('%',#{vo.roleName},'%')
                </if>
                and is_deleted = 0
            </where>
            order by id desc
        </select>

### 6.测试 ###

利用Swagger2测试结果  
输入参数：

![在这里插入图片描述][a0bad2852ee1460faaba1b5a2f78b2e3.png]  
得到json数据：

{
        
      "code": 200,
      "message": "成功",
      "data": {
        
        "records": [
          {
        
            "id": "17",
            "createTime": "2022-12-08 18:18:06",
            "updateTime": "2022-12-08 18:18:06",
            "isDeleted": 0,
            "param": {
        },
            "roleName": "测试角色",
            "roleCode": "1232",
            "description": null
          },
          {
        
            "id": "16",
            "createTime": "2022-12-04 15:54:54",
            "updateTime": "2022-12-04 15:54:54",
            "isDeleted": 0,
            "param": {
        },
            "roleName": "钟离",
            "roleCode": "Lord Land",
            "description": null
          }
        ],
        "total": 11,
        "size": 2,
        "current": 1,
        "orders": [],
        "optimizeCountSql": true,
        "hitCount": false,
        "countId": null,
        "maxLimit": null,
        "searchCount": true,
        "pages": 6
      }
    }

[a0bad2852ee1460faaba1b5a2f78b2e3.png]: https://img-blog.csdnimg.cn/a0bad2852ee1460faaba1b5a2f78b2e3.png