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这篇文章主要为大家展示了“mybatis-plus使用问题的示例分析”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“mybatis-plus使用问题的示例分析”这篇文章吧。
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>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>
以上是“mybatis-plus使用问题的示例分析”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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