一、多表联合分页查询
1.多表联合查询结果集建议使用VO类,当然也可以使用resultMap
- package com.cjhx.tzld.entity.vo;
-
- import com.baomidou.mybatisplus.annotation.IdType;
- import com.baomidou.mybatisplus.annotation.TableField;
- import com.baomidou.mybatisplus.annotation.TableId;
- import com.cjhx.tzld.entity.TContent;
- import com.fasterxml.jackson.annotation.JsonFormat;
- import io.swagger.annotations.ApiModel;
- import io.swagger.annotations.ApiModelProperty;
- import lombok.Data;
- import org.springframework.format.annotation.DateTimeFormat;
- import java.util.Date;
- @Data
- @ApiModel(value="TContentVo", description="内容池多表联合数据对象")
- public class TContentVo extends TContent {
- @ApiModelProperty(value = "编号")
- private Integer cid;
- @ApiModelProperty(value = "内容标题")
- private String title;
- @ApiModelProperty(value = "作者Id")
- @TableField("authorId")
- private Integer authorId;
- @ApiModelProperty(value = "时间")
- @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8") //返回时间类型
- @DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss") //接收时间类型
- private Date time;
- @ApiModelProperty(value = "内容")
- private String content;
- @ApiModelProperty(value = "作者姓名")
- private String author;
- @ApiModelProperty(value = "话题")
- private String topic;
- @ApiModelProperty(value = "模块编号")
- private int moduleNum;
- @ApiModelProperty(value = "模块")
- private String module;
- public TContentVo() {
- }
- public TContentVo(Integer cid, String title, Date time, String content, String author, String topic, int moduleNum) {
- this.cid = cid;
- this.title = title;
- this.time = time;
- this.content = content;
- this.author = author;
- this.topic = topic;
- this.moduleNum = moduleNum;
- }
2.controller
- package com.cjhx.tzld.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.cjhx.tzld.common.Result;
- import com.cjhx.tzld.entity.TContent;
- import com.cjhx.tzld.entity.TContentRelationFund;
- import com.cjhx.tzld.entity.TTopicPk;
- import com.cjhx.tzld.entity.vo.TContentVo;
- import com.cjhx.tzld.service.TContentService;
- import io.swagger.annotations.*;
- import org.springframework.transaction.annotation.Transactional;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.bind.annotation.RequestParam;
- import org.springframework.web.bind.annotation.RestController;
- import javax.annotation.Resource;
- import java.util.Date;
- import java.util.List;
- /**
- * @since 2022-02-28
- */
- @RestController
- @RequestMapping("/content")
- @Api("内容池模块")
- public class ContentController {
- @Resource
- private TContentService contentService;
- @ApiImplicitParams({
- @ApiImplicitParam(name = "cid",value = "cid",dataType = "int",defaultValue = "0",required = false),
- @ApiImplicitParam(name = "title",value = "标题",dataType = "String",defaultValue = "",required = false),
- @ApiImplicitParam(name = "author",value = "作者姓名",dataType = "String",defaultValue = "",required = false),
- @ApiImplicitParam(name = "time",value = "发布时间",dataType = "Date",defaultValue = "",required = false),
- @ApiImplicitParam(name = "content",value = "内容",dataType = "String",defaultValue = "",required = false),
- @ApiImplicitParam(name = "topic",value = "话题",dataType = "String",defaultValue = "",required = false),
- @ApiImplicitParam(name = "moduleNum",value = "投放模块 1热点速递 2基会直达",dataType = "int",defaultValue = "",required = false),
- @ApiImplicitParam(name = "pageIndex",value = "页码",dataType = "int",defaultValue = "1",required = false),
- @ApiImplicitParam(name = "pageSize",value = "每页数量",dataType = "int",defaultValue = "10",required = false)
- })
- @ApiResponses({
- @ApiResponse(code = 200,message = "OK",response = TContent.class)
- @ApiOperation(value="分页获取内容接口(Web端)", notes="支持多条件查询",httpMethod = "GET")
- @RequestMapping(value = "/getContentPage",method = RequestMethod.GET)
- public Result getContentPage(@RequestParam(defaultValue = "0",required = false) int cid,
- @RequestParam(defaultValue = "",required = false) String title,
- @RequestParam(defaultValue = "",required = false) String author,
- @RequestParam(required = false) Date time,
- @RequestParam(defaultValue = "",required = false) String content,
- @RequestParam(defaultValue = "",required = false) String topic,
- @RequestParam(defaultValue = "0",required = false) int moduleNum,
- @RequestParam(defaultValue = "1",required = false) int pageIndex,
- @RequestParam(defaultValue = "10",required = false) int pageSize) throws Exception{
- try {
- IPage<TContentVo> byPage = contentService.findByPage(new Page<TContentVo>(pageIndex, pageSize),new TContentVo(cid, title, time, content, author, topic, moduleNum));
- return Result.success(byPage);
- }catch (Exception e){
- return Result.serviceFail(e.getMessage());
- }
- }
- }
3.service
- package com.cjhx.tzld.service.impl;
-
- import com.baomidou.mybatisplus.core.conditions.Wrapper;
- 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.cjhx.tzld.common.PageUtil;
- import com.cjhx.tzld.entity.TContent;
- import com.cjhx.tzld.entity.vo.TContentVo;
- import com.cjhx.tzld.mapper.TContentMapper;
- import com.cjhx.tzld.service.TContentService;
- import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
- import org.springframework.stereotype.Service;
- import javax.annotation.Resource;
- import java.util.Date;
- /**
- * @since 2022-02-28
- */
- @Service
- public class TContentServiceImpl extends ServiceImpl<TContentMapper, TContent> implements TContentService {
- @Resource
- private TContentMapper tContentMapper;
- @Override
- public IPage<TContentVo> findByPage(Page<TContentVo> page, TContentVo contentVo) {
- return tContentMapper.findByPage(page,contentVo);
- }
- }
4.mapper
- package com.cjhx.tzld.mapper;
-
- 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.cjhx.tzld.entity.TContent;
- import com.baomidou.mybatisplus.core.mapper.BaseMapper;
- import com.cjhx.tzld.entity.vo.TContentVo;
- import org.apache.ibatis.annotations.Param;
- /**
- * @since 2022-02-28
- */
- public interface TContentMapper extends BaseMapper<TContent> {
- IPage<TContentVo> findByPage(Page<TContentVo> page, @Param("contentVo") TContentVo contentVo);
- }
5.mapper.xml,注意入参contentVo
- <?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.cjhx.tzld.mapper.TContentMapper">
-
- <select id="findByPage" resultType="com.cjhx.tzld.entity.vo.TContentVo" parameterType="com.cjhx.tzld.entity.vo.TContentVo">
- SELECT t.`cid`,t.`authorId`,a.`name`,t.`title`,t.`time`,t.`content`,p.`topic`,h.`title` AS `module`
- FROM `t_content` t
- LEFT JOIN `t_author` a ON a.`aid`=t.`authorId`
- LEFT JOIN `t_topic_pk` p ON p.`cid` = t.`cid`
- LEFT JOIN `t_hot_express` h ON h.`cid` = t.`cid`
- UNION ALL
- SELECT t.`cid`,t.`authorId`,a.`name`,t.`title`,t.`time`,t.`content`,p.`topic`,f.`title` AS `module`
- LEFT JOIN `t_fund_point` f ON f.`cid` = t.`cid`
- <where>
- 1=1
- <if test="contentVo.cid > 0"> and cid = #{contentVo.cid}</if>
- <if test="contentVo.title != null and contentVo.title != ''"> and t.title like concat('%', #{contentVo.title}, '%')</if>
- <if test="contentVo.author != null and contentVo.author != ''"> and a.author like concat('%', #{contentVo.author}, '%')</if>
- <if test="contentVo.time != null"> and t.time =${contentVo.time}</if>
- <if test="contentVo.content != null and contentVo.content != ''"> and t.content like concat('%', #{contentVo.content}, '%')</if>
- <if test="contentVo.topic != null and contentVo.topic != ''"> and p.topic like concat('%', #{contentVo.topic}, '%')</if>
- <if test="contentVo.moduleNum == 1"> and f.currentState = -1</if>
- <if test="contentVo.moduleNum == 2"> and h.currentState = -1</if>
- </where>
- order by time desc
- </select>
- </mapper>
二、找不到mapper
首先排除@MapperScan("com.cjhx.tzld.mapper")已添加
1.首先配置文件扫描,mapper-locations:classpath:/com/cjhx/tzld/mapper/xml/*.xml
- mybatis-plus:
- configuration:
- log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
- mapper-locations: classpath:/com/cjhx/tzld/mapper/xml/*.xml
2.在pom.xml的<build>添加xml资源
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- </plugin>
- </plugins>
- <resources>
- <!--引入mapper对应的xml文件-->
- <resource>
- <directory>src/main/java</directory>
- <includes>
- <include>**/*.xml</include>
- </includes>
- </resource>
- </resources>
- </build>
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