springboot整合分页插件

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @Description: 分页配置
 * @author woniu
 * @date 2023-09-18 14:53
 **/
@Configuration
@Slf4j
public class MybatisPlusConfig {


    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        final long limit  = 500L;
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        //你的最大单页限制数量，默认 500 条，小于 0 如 -1 不受限制)
        paginationInterceptor.setLimit(limit);
        log.info("注册分页插件,你的最大单页限制数量:"+limit);
        return paginationInterceptor;
    }
}

<!--mybatis-plus 持久层-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.3.2</version>
</dependency>

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;

/**
 * @author woniu
 * @date 2023-09-18
 */
public class PageUtil {
    /**
     * 构建page 由于表单分页是从0开始的，所有这里统一都从0开始
     * @param pageNum
     * @param pageSize
     * @return
     */
    public static <T> Page<T> buildPage(Integer pageNum,Integer pageSize){
        pageNum = pageNum==null?0:pageNum;
        pageSize = pageSize==null?25:pageSize;
        return new Page<>(pageNum,pageSize);
    }
}

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

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

/**
 * 分页实体类
 *
 * @author woniu
 */
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class PageResult<T> implements Serializable {
    private static final long serialVersionUID = -275582248840137389L;
    /**
     * 总数
     */
    private Long count;

    /**
     * 当前页结果集
     */
    private List<T> data;


    public static <T> PageResult<T> empty() {
        return new PageResult<>(0L, new ArrayList<>());
    }

}

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, UserEntity> implements UserService {


    @Override
    public PageResult<UserRespVo> findList(UserReqVo reqVo) {
        Page<UserRespVo> page = PageUtil.buildPage(reqVo.getPageNum(), reqVo.getPageSize());
        List<UserRespVo> list = this.baseMapper.findList(page, reqVo);
        return PageResult.<UserRespVo>builder()
                .data(list)
                .count(page.getTotal())
                .build();
    }

public interface UserMapper extends BaseMapper<UserEntity> {

    /**
     * 列表
     *
     * @param page
     * @param reqVo
     * @return
     */
    List<UserRespVo> findList(Page<UserRespVo> page, @Param("vo") UserReqVo reqVo);

}

<?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.woniu.woniuuser.mapper.UserMapper">
    <resultMap id="userRespVo" type="com.woniu.crm.user.resp.UserRespVo"></resultMap>


    <select id="findList" resultMap="userRespVo">
        select * from user
        <where>
            and del_flag = '009'
            <if test="vo.userName != null and vo.userName != ''">
                <bind name="likeUserName" value="'%' + vo.userName + '%'"/>
                and user_name like #{likeUserName}
            </if>
        </where>
    </select>

</mapper>