springboot项目分页查询

pom.xml

<dependency>
         <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
          <version>3.5.9</version>
          <exclusions>
              <exclusion>
                  <groupId>com.github.pagehelper</groupId>
                  <artifactId>pagehelper</artifactId>
              </exclusion>
          </exclusions>
      </dependency>
      <dependency>
          <groupId>com.github.pagehelper</groupId>
          <artifactId>pagehelper-spring-boot-starter</artifactId>
          <version>1.4.7</version>
      </dependency>
      <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.34</version>
            <scope>provided</scope>
        </dependency>

utils/PageResult.java（自定义分页返回格式）

package com.example.server_assess.utils;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;
import java.util.List;

/**
 * 封装分页查询结果
 */

@Data
@AllArgsConstructor
@NoArgsConstructor
public class PageResult implements Serializable {

    private long total; //总记录数
    private List records;//当前页数据集合
}

Service层使用

import com.example.server_assess.utils.PageResult;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;

@Autowired
AssessMapper assessMapper;

@Override
    public ResultJson getAssessList(Map<String, Object> params) {
		// 设置分页
        Integer currentPage = 1;
        Integer pageNum = 30;
        if(params.containsKey("currentPage")){
            currentPage = (Integer) params.get("currentPage");
        }
        if(params.containsKey("pageNum")){
            pageNum = (Integer) params.get("pageNum");
        }
        PageHelper.startPage(currentPage, pageNum);

        Page<AssessListDto> page =  assessMapper.getAssessList(params);
		long total = page.getTotal();
		return new ResultJson<>(new PageResult(total, page.getResult()));
	}

Mapper层

@Mapper
public interface AssessMapper extends BaseMapper<Assess> {
	Page<AssessListDto> getAssessList(Map<String, Object> params);
}

xml

<select id="getAssessList" parameterType="map" resultType="com.example.server_assess.pros.assess.model.dto.AssessListDto">
        SELECT
            assess_id as "assessId",
            name,
            idno,
            age
        FROM
            tb_assess
        WHERE
			state=1
            
            <if test="name != null and name != ''">
                and name like concat('%', #{name}, '%')
            </if>
            <if test="idno != null and idno != ''">
                and idno = #{idno}
            </if>
            
        ORDER BY assess_id desc
    </select>