后端分页逻辑

编程语言 2018-07-17 05:15:11 阅读次数: 0

项目之前分页是在前端写的，现在因为数据量比较大，需要把分页逻辑放到后端写，重新温习了下分页,并且做下记录，里面是我自己的一些业务逻辑，需要的话换成自己的逻辑就OK了。

1.工具类ResultData

package com.zknw.util;

import com.zknw.constant.Code;

public class ResultData<T> {
	
	private String code;
	private String message;
	private T data;
	private Integer count;

	public Integer getCount() {
		return count;
	}

	public void setCount(Integer count) {
		this.count = count;
	}

	public String getCode() {
		return code;
	}
	public void setCode(String code) {
		this.code = code;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public T getData() {
		return data;
	}
	public void setData(T data) {
		this.data = data;
	}
	public ResultData() {
		super();
		// TODO Auto-generated constructor stub
	}
	public ResultData(T data) {
		super();
		this.code = Code.SUCCESS;
		this.message ="成功";
		this.data = data;
	}
	
	public ResultData(String code, String message, T data) {
		super();
		this.code = code;
		this.message = message;
		this.data = data;

	}

	public ResultData(String code, String message, Integer count) {
		super();
		this.code = code;
		this.message = message;
		this.count = count;
	}

	public ResultData(String code, String message, T data, Integer count) {
		super();
		this.code = code;
		this.message = message;
		this.data = data;
		this.count = count;
	}

	public void setUp(String code, String message, T data){
		this.code = code;
		this.message = message;
		this.data = data;
	} 
}

2.分页工具类RHWarnVO，继承的实体类我就不贴了

package com.zknw.basicmanage.model;

import java.io.Serializable;

public class RHWarnVO extends ReportHisWarnVO implements Serializable {

    /**
     * turbineIds
     */
    private Integer[] deviceIds;

    /**
     * tagIds
     */
    private Integer[] tagIds;

    /**
     *当前页
     */
    private Integer pageNumber;

    /**
     *每页多少
     */
    private Integer quantity;

    /**
     *总条数
     */
    private Integer count;

    /**
     *起始索引
     */
    private Integer start;

    /**
     * 排序字段
     */
    private String sortField;

    /**
     * 排序数值,1正序,-1倒序
     */
    private Integer sortOrder;

    /**
     * 模糊查询条件
     */
    private String divWarnName;

    public Integer getPageNumber() {
        return pageNumber;
    }

    public void setPageNumber(Integer pageNumber) {
        this.pageNumber = pageNumber;
    }

    public Integer getQuantity() {
        return quantity;
    }

    public void setQuantity(Integer quantity) {
        this.quantity = quantity;
    }

    public Integer getCount() {
        return count;
    }

    public void setCount(Integer count) {
        this.count = count;
    }

    public Integer getStart() {
        return start;
    }

    public void setStart(Integer start) {
        this.start = start;
    }

    public String getSortField() {
        return sortField;
    }

    public void setSortField(String sortField) {
        this.sortField = sortField;
    }

    public Integer getSortOrder() {
        return sortOrder;
    }

    public void setSortOrder(Integer sortOrder) {
        this.sortOrder = sortOrder;
    }

    public String getDivWarnName() {
        return divWarnName;
    }

    public void setDivWarnName(String divWarnName) {
        this.divWarnName = divWarnName;
    }

    public Integer[] getDeviceIds() {
        return deviceIds;
    }

    public void setDeviceIds(Integer[] deviceIds) {
        this.deviceIds = deviceIds;
    }

    public Integer[] getTagIds() {
        return tagIds;
    }

    public void setTagIds(Integer[] tagIds) {
        this.tagIds = tagIds;
    }
}

3.controller接口

package com.zknw.basicmanage.controller;


import com.zknw.basicmanage.api.ReportHisWarnService;
import com.zknw.basicmanage.model.RHWarnVO;
import com.zknw.basicmanage.model.ReportHisWarn;
import com.zknw.basicmanage.model.ReportHisWarnVO;
import com.zknw.constant.Code;
import com.zknw.sysmanage.controller.BaseController;
import com.zknw.util.ResultData;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * 历史预警
 */
@RestController
@RequestMapping(value = "${versionPath}/reportHisWarns",produces="text/plain; charset=UTF-8")
public class ReportHisWarnController extends BaseController {

    @Autowired
    private ReportHisWarnService reportHisWarnService;

    private static final Logger logger = Logger.getLogger(ReportHisWarnController.class);

    /**
     * 查询历史预警
     */
    @RequestMapping(value="/getReportHisWarnVOByIds",method=RequestMethod.POST)
    public void getReportHisWarnVOByIds(HttpServletRequest request,HttpServletResponse response, @RequestBody RHWarnVO rhWarnVO){
        try{
            retBases(request,response,new ResultData(Code.SUCCESS, "查询成功", reportHisWarnService.getReportHisWarnVOByIds(rhWarnVO), reportHisWarnService.countrte(rhWarnVO)));
        }catch(Exception e){
            logger.error("历史预警的控制层",new Throwable(e.getMessage()));
            retBases(request,response,new ResultData(Code.ERROR, "查询失败", e.getMessage()));
        }
    }
}

4.service接口就不贴了，直接上实现类

package com.zknw.basicmanage.impl;

import com.zknw.basicmanage.api.ReportHisWarnService;
import com.zknw.basicmanage.dao.ReportHisWarnDao;
import com.zknw.basicmanage.model.RHWarnVO;
import com.zknw.basicmanage.model.ReportHisWarn;
import com.zknw.basicmanage.model.ReportHisWarnVO;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 报表预警服务
 */
@Service("reportHisWarnService")
public class ReportHisWarnServiceImpl implements ReportHisWarnService {

    @Resource
    private ReportHisWarnDao reportHisWarnDao;
    private static final Logger logger = Logger.getLogger(ReportHisWarnServiceImpl.class);

    /**
     *查询历史预警
     * @return
     */
    @Override
    public List<ReportHisWarnVO> getReportHisWarnVOByIds(RHWarnVO rhWarnVO) throws Exception{
        try{
            Map<String,Object> map=new HashMap<String,Object>();
            map.put("startTime", rhWarnVO.getStartTime());
            map.put("endTime", rhWarnVO.getEndTime());
            map.put("deviceIds", rhWarnVO.getDeviceIds());
            map.put("tagIds", rhWarnVO.getTagIds());
            map.put("pageNumber",rhWarnVO.getPageNumber());
            map.put("quantity",rhWarnVO.getQuantity());
            map.put("divWarnName",rhWarnVO.getDivWarnName());
            map.put("sortField",rhWarnVO.getSortField());
            if (rhWarnVO.getSortOrder() != null && rhWarnVO.getSortOrder() == 1){
                map.put("sortOrder","asc");
            }else if (rhWarnVO.getSortOrder() != null && rhWarnVO.getSortOrder() == -1){
                map.put("sortOrder","desc");
            }else {
                map.put("sortOrder","asc");
            }
            return reportHisWarnDao.getReportHisWarnVOByIds(map);
        }catch (Exception e){
            logger.info("报表预警服务",new Throwable(e.getMessage()));
            throw e;
        }
    }

    @Override
    public Integer countrte(RHWarnVO rhWarnVO) {
        try{
            return reportHisWarnDao.countrte(rhWarnVO);
        }catch (Exception e){
            logger.info("报表预警服务",new Throwable(e.getMessage()));
            return null;
        }
    }
}

5.mapper文件，dao层的接口就不贴了

<?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.zknw.basicmanage.dao.ReportHisWarnDao" >
  <resultMap id="BaseResultMap" type="com.zknw.basicmanage.model.ReportHisWarn" >
    <id column="earlywarningid" property="earlyWarningId" jdbcType="BIGINT" />
    <result column="deviceid" property="deviceId" jdbcType="BIGINT" />
    <result column="tagid" property="tagId" jdbcType="BIGINT" />
    <result column="stateid" property="stateId" jdbcType="BIGINT" />
    <result column="starttime" property="startTime" jdbcType="DATE" />
    <result column="endtime" property="endTime" jdbcType="DATE" />
    <result column="statename" property="stateName" jdbcType="VARCHAR" />
    <result column="maxval" property="maxVal" jdbcType="DECIMAL" />
    <result column="minval" property="minVal" jdbcType="DECIMAL" />
  </resultMap>

  <select id="getReportHisWarnVOByIds" resultType="com.zknw.basicmanage.model.ReportHisWarnVO" parameterType="java.util.Map">
    SELECT skip #{pageNumber} FIRST #{quantity}
    rte.earlywarningid,
    rte.deviceid,
    rte.tagid,
    rte.stateid,
    rte.starttime,
    rte.endtime,
    rte.statename,
    rte.maxval,
    rte.minval,
    bd.devicename turbinename,bta.tagname,bf.farmname,bms.statecolor from r_turbine_earlywarning rte
    LEFT JOIN basic_device bd ON bd.deviceid = rte.deviceid
    LEFT JOIN basic_tag bta ON bta.tagid =rte.tagid
    LEFT JOIN basic_farm  bf ON bf.farmid = bd.farmid
    LEFT JOIN basic_matrix_state bms ON bms.stateid = rte.stateid
    where 1=1
    <if test="deviceIds != null">
      rte.deviceid IN
      <foreach item="item" index="index" collection="deviceIds" open="(" separator="," close=")">
        #{item}
      </foreach>
    </if>
    <if test="startTime != null and startTime != ''">
      AND rte.starttime <![CDATA[>=]]> #{startTime}
    </if>
    <if test="endTime != null and endTime != ''">
      AND rte.endtime <![CDATA[<=]]> #{endTime}
    </if>
    <if test="divWarnName != null and divWarnName != ''">
      AND concat(concat(bf.farmname,bd.devicename),bta.tagname) like '%${divWarnName}%'
    </if>
    <if test="sortField != null and sortField != ''">
      ORDER BY ${sortField} ${sortOrder}
    </if>
  </select>

  <select id="countrte" resultType="java.lang.Integer" parameterType="com.zknw.basicmanage.model.RHWarnVO">
    SELECT count(*) from r_turbine_earlywarning rte
    LEFT JOIN basic_device bd ON bd.deviceid = rte.deviceid
    LEFT JOIN basic_tag bta ON bta.tagid =rte.tagid
    LEFT JOIN basic_farm  bf ON bf.farmid = bd.farmid
    LEFT JOIN basic_matrix_state bms ON bms.stateid = rte.stateid
    where 1=1
    <if test="deviceIds != null">
      rte.deviceid IN
      <foreach item="item" index="index" collection="deviceIds" open="(" separator="," close=")">
        #{item}
      </foreach>
    </if>
    <if test="startTime != null and startTime != ''">
      AND rte.starttime <![CDATA[>=]]> #{startTime}
    </if>
    <if test="endTime != null and endTime != ''">
      AND rte.endtime <![CDATA[<=]]> #{endTime}
    </if>
    <if test="divWarnName != null and divWarnName != ''">
      AND concat(concat(bf.farmname,bd.devicename),bta.tagname) like '%${divWarnName}%'
    </if>
  </select>

</mapper>

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