SpringBoot分页条件查询操作

UserQuery

package com.xxxx.springboot.query;

/**
 * 分页及条件查询
 */
public class UserQuery {
    /*分页参数*/
    private Integer pageNum = 1;//当前页
    private Integer pageSize = 10;//每页显示的记录数量

    /*条件查询的参数*/
    private String userName;//查询条件：用户名

    public Integer getPageNum() {
        return pageNum;
    }

    public void setPageNum(Integer pageNum) {
        this.pageNum = pageNum;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }
}

接口方法定义

package com.xxxx.springboot.dao;

import com.xxxx.springboot.po.User;
import com.xxxx.springboot.query.UserQuery;

import java.util.List;

public interface UserDao {

    //分页条件查询
    public List<User> queryUserList(UserQuery userQuery);
}

映射文件配置

<?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.xxxx.springboot.dao.UserDao">

    <select id="queryUserList" parameterType="com.xxxx.springboot.query.UserQuery" resultType="com.xxxx.springboot.po.User">
        select
            *
        from
            student
        <where>
            <if test="userName != null and userName != ''">
                and user_name like concat('%',#{userName},'%')
            </if>
        </where>
    </select>
</mapper>

UserService

package com.xxxx.springboot.service;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.xxxx.springboot.dao.UserDao;
import com.xxxx.springboot.po.User;
import com.xxxx.springboot.query.UserQuery;
import com.xxxx.springboot.utils.AssertUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class UserService {

    @Resource
    private UserDao userDao;

    /** 通过指定参数，分页查询用户列表
     * @param userQuery
     * @return
     */
    public PageInfo<User> queryUserByParams(UserQuery userQuery) {
        //开启分页
        PageHelper.startPage(userQuery.getPageNum(), userQuery.getPageSize());
        //返回分页对象
        return new PageInfo<User>(userDao.queryUserList(userQuery));
    }

}

UserController

package com.xxxx.springboot.controller;

import com.github.pagehelper.PageInfo;
import com.xxxx.springboot.exception.ParamsException;
import com.xxxx.springboot.po.ResultInfo;
import com.xxxx.springboot.po.User;
import com.xxxx.springboot.query.UserQuery;
import com.xxxx.springboot.service.UserService;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

@RestController
public class UserController {

    @Resource
    private UserService userService;

    /*** 通过指定参数，分页查询用户列表
     * @param userQuery
     * @return
     */
    @GetMapping("user/list")
    public PageInfo<User> list(UserQuery userQuery) {
        return userService.queryUserByParams(userQuery);
    }

}

浏览器测试