完整案例：
SpringBoot + laypage分页 + 模糊查询 完整案例
下面在通过实例代码介绍下springboot +mybatis 使用PageHelper实现分页并带条件模糊查询功能，内容如下所示：
调用接口Controller类
@ApiOperation("查询列表")
@PostMapping("/selectList")
public Result selectList(@RequestBody User_InfoListRequest userInfo ) {
Page page = PageHelper.startPage(userInfo.pageNum,userInfo.pageSize); //这行是重点（放在方法第一行）表示从pageNum页开始，每页pageSize条数据
List<User_info> _list= userService.selectList(userInfo);//返回集合和分页之前不要有其它代码，这两行上下要紧靠近
PageInfo pageInfo = new PageInfo<>(_list);
return Result.SUCCESS( pageInfo);
}package com.xj.demo.model.Request;
import com.fasterxml.jackson.annotation.JsonProperty;
import io.swagger.annotations.ApiModelProperty;
public class User_InfoListRequest extends PageRequest {
@ApiModelProperty(value = "学生姓名")
public String uname;
@ApiModelProperty(value = "学生年龄")
public int uage;
}
import lombok.Data;
@Data
public class PageRequest {
@ApiModelProperty(value = "当前页码")
public Integer pageNum;
@ApiModelProperty(value = "分页大小")
public Integer pageSize;定义接口,注意红色显示部分
package com.xj.demo.mapper;
import com.github.pagehelper.Page;
import com.xj.demo.model.Request.UserEditRequest;
import com.xj.demo.model.Request.User_InfoListRequest;
import com.xj.demo.model.Response.UserInfoResponse;
import com.xj.demo.model.entity.User_info;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
@Mapper
public interface User_infoMapper {
// 查询列表
List<User_info> selectList(@Param("userInfo") User_InfoListRequest userInfo);
}实现接口service
package com.xj.demo.service;
import com.github.pagehelper.Page;
import com.xj.demo.mapper.User_infoMapper;
import com.xj.demo.model.Request.UserEditRequest;
import com.xj.demo.model.Request.User_InfoListRequest;
import com.xj.demo.model.Response.UserInfoResponse;
import com.xj.demo.model.entity.User_info;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class User_infoService implements User_infoMapper {
@Autowired
private User_infoMapper uMapper;
@Override
public List<User_info> selectList(User_InfoListRequest userInfo) {
return uMapper.selectList(userInfo);
}
}mapper中sql语句uname进行模糊查询和年龄完全匹配
<!---查询列表-->
<select id="selectList" resultType="User_info">
select * from User_info where 1=1
<if test="userInfo!=null">
<if test="userInfo.uname!=null and userInfo.uname!='' ">
and uname like '%' #{userInfo.uname} '%'
</if>
<if test="userInfo.uage!=0">
and uage = #{userInfo.uage}
</if>
</if>
order by create_time desc
</select>使用postman进行接口测试
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