目录
一、会议通知查询SQL（难点）
登录xx账号，就要查出凡是xx是参与者、列席这、主持人中的一员，那么都要查出来
查询条件：登录用户 id 2
分析（涉及到的表）：
会议信息表：t_oa_meeting_info
会议反馈表：t_oa_meeting_feedback
例： 1、查询出带xx id=2 的会议信息：
SELECT * from t_oa_meeting_info where FIND_IN_SET(2,CONCAT(canyuze,',',liexize,',',zhuchiren)) and state=4运行SQL结果：
2、不管会议是否得到反馈，都要查询出来，所以选外连接，会议信息表为主：SELECT IFNULL(f.result,-1) result,t1.* FROM (SELECT * from t_oa_meeting_info where FIND_IN_SET(2,CONCAT(canyuze,',',liexize,',',zhuchiren)) and state=4) t1 LEFT JOIN t_oa_meeting_feedback f on t1.id=f.meetingId and f.personId=2 ORDER BY result;运行SQL结果：
二、会议反馈详情SQL（难点）
分析（涉及到的表）：
用户表：t_oa_user
会议信息表：t_oa_meeting_info
会议反馈表：t_oa_meeting_feedback
查询条件：会议 id 12
1、拿到会议 id 为12的会议，所有参与人员的姓名
1） 先拿到所有的参与人员 id
SELECT CONCAT(canyuze,',',liexize,',',zhuchiren) from t_oa_meeting_info where id=12SQL运行结果：
2) 再拿到对应参与人员的姓名
SELECT * from t_oa_user where FIND_IN_SET(id, (SELECT CONCAT(canyuze,',',liexize,',',zhuchiren) from t_oa_meeting_info where id=12))SQL运行结果：
2、连接 会议信息反馈表，拿到对应的反馈情况（未读、参加、不参加）
SELECT * from t_oa_user where FIND_IN_SET(id, (SELECT CONCAT(canyuze,',',liexize,',',zhuchiren) from t_oa_meeting_info where id=12))SQL运行结果：
3、根据 会议信息反馈情况进行分组
select t.result,GROUP_CONCAT(t.name) names from (select t1.name,IFNULL(f.result,-1) result from (SELECT * from t_oa_user where FIND_IN_SET(id, (SELECT CONCAT(canyuze,',',liexize,',',zhuchiren) from t_oa_meeting_info where id=12))) t1 left join t_oa_meeting_feedback f on t1.id=f.personId and f.meetingId=12) t GROUP BY t.resultSQL运行结果：
三、会议通知后台代码实现
这里简单提及一下前端代码：
header.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <link rel="stylesheet" href="${pageContext.request.contextPath }/static/js/layui/css/layui.css"> <!-- 引入 layui.js --> <script src="${pageContext.request.contextPath }/static/js/layui/layui.js"></script> <!-- 指定整个项目的根路径 --> <base href="${pageContext.request.contextPath }/"/> <!-- 存放layui扩展模块的配置文件 --> <script src="${pageContext.request.contextPath }/static/js/layui/config.js"></script> <input id="ctx" value="${pageContext.request.contextPath }" type="hidden"/> <title>玉渊工作室</title>
前面SQL语句都已编写完毕，接下来就开始实现后台代码了：
实体类：MeetingFeedBack 对应会议反馈表
package com.zking.entity;
import java.io.Serializable;
/**
* t_oa_meeting_feedback 会议反馈表
* 实体类：会议反馈
* @author 杨总
*
*/
public class MeetingFeedBack implements Serializable {
private String id;
private Long meetingId;
private Integer personType;
private Long personId;
private Integer result;
private String reason;
// 会议标题
private String title;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Long getMeetingId() {
return meetingId;
}
public void setMeetingId(Long meetingId) {
this.meetingId = meetingId;
}
public Integer getPersonType() {
return personType;
}
public void setPersonType(Integer personType) {
this.personType = personType;
}
public Long getPersonId() {
return personId;
}
public void setPersonId(Long personId) {
this.personId = personId;
}
public Integer getResult() {
return result;
}
public void setResult(Integer result) {
this.result = result;
}
public String getReason() {
return reason;
}
public void setReason(String reason) {
this.reason = reason;
}
public MeetingFeedBack() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "MeetingFeedBack [id=" + id + ", meetingId=" + meetingId + ", personType=" + personType + ", personId="
+ personId + ", result=" + result + ", reason=" + reason + "]";
}
}MeetingFeedBackDao：
package com.zking.dao;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import com.zking.entity.MeetingFeedBack;
import com.zking.util.BaseDao;
import com.zking.util.PageBean;
public class MeetingFeedBackDao extends BaseDao<MeetingFeedBack>{
//会议通知查询
public List<Map<String, Object>> queryMeetingFeedBackByUserId(MeetingFeedBack back, PageBean pageBean)
throws SQLException, InstantiationException, IllegalAccessException {
String sql="SELECT\r\n" +
" IFNULL(f.result,-1) result,t1.*\r\n" +
" FROM\r\n" +
" (SELECT * from t_oa_meeting_info where FIND_IN_SET("+back.getPersonId()+",CONCAT(canyuze,',',liexize,',',zhuchiren)) and state=4) t1\r\n" +
" LEFT JOIN t_oa_meeting_feedback f on t1.id=f.meetingId\r\n" +
" and f.personId="+back.getPersonId()+"\r\n" +
" ORDER BY result";
return super.executeQuery(sql, pageBean);
}
// back.getPersonId()
}
MeetingFeedBackAction：
package com.zking.web;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zking.dao.MeetingFeedBackDao;
import com.zking.entity.MeetingFeedBack;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.PageBean;
import com.zking.util.R;
import com.zking.util.ResponseUtil;
public class MeetingFeedBackAction extends ActionSupport implements ModelDriver<MeetingFeedBack>{
private MeetingFeedBack back=new MeetingFeedBack();
private MeetingFeedBackDao backDao=new MeetingFeedBackDao();
@Override
public MeetingFeedBack getModel() {
return back;
}
// 会议通知查询
public String queryMeetingFeedBackByUserId(HttpServletRequest req, HttpServletResponse resp) {
try {
PageBean pageBean=new PageBean();
pageBean.setRequest(req);
List<Map<String, Object>> infos = backDao.queryMeetingFeedBackByUserId(back, pageBean);
// 注意：layui中的数据表格的格式
ResponseUtil.writeJson(resp, R.ok(0, "会议通知数据查询成功",pageBean.getTotal(),infos));
} catch (Exception e) {
e.printStackTrace();
try {
ResponseUtil.writeJson(resp, R.error(0, "会议通知数据查询失败"));
} catch (Exception e2) {
e2.printStackTrace();
}
}
return null;
}
}
mvc.xml:
<action path="/feedBack" type="com.zking.web.MeetingFeedBackAction">
</action>运行效果如下：
四、会议反馈功能实现（是否参会）
MeetingFeedBackDao：
// 会议反馈
public int add(MeetingFeedBack back) throws Exception {
String sql="insert into t_oa_meeting_feedback values (?,?,?,?,?,?)";
//前台没有传递id到后台，所以自己生成id
back.setId(UUID.randomUUID().toString().replace("-", ""));
return super.executeUpdate(sql, back, new String [] {"id","meetingId","personType","personId","result","reason"});
}MeetingFeedBackAction：
//会议反馈
public String add(HttpServletRequest req, HttpServletResponse resp) {
try {
// rs是sql语句执行的影响行数
int rs = backDao.add(back);
if(rs>0) {
ResponseUtil.writeJson(resp, R.ok(200, "会议反馈信息成功"));
}else {
ResponseUtil.writeJson(resp, R.error(0, "会议反馈信息失败"));
}
} catch (Exception e) {
e.printStackTrace();
try {
ResponseUtil.writeJson(resp, R.error(0, "会议反馈信息失败"));
} catch (Exception e2) {
e2.printStackTrace();
}
}
return null;
}
接下来运行：
点击会议反馈按钮之后：
我们会发现第16条数据已经没有了，进数据库查询 会议信息反馈表（t_oa_meeting_feedback）：
会议反馈功能已实现~
五、反馈详情功能实现
MeetingFeedBackDao：
// 会议反馈详情
public List<Map<String, Object>> queryMeetingBackByMeetingId(MeetingFeedBack back, PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException {
String sql="select \r\n" +
" t.result,GROUP_CONCAT(t.name) names\r\n" +
" from\r\n" +
" (select \r\n" +
" t1.name,IFNULL(f.result,-1) result\r\n" +
" from\r\n" +
" (SELECT * from t_oa_user where FIND_IN_SET(id, (SELECT CONCAT(canyuze,',',liexize,',',zhuchiren) from\r\n" +
" t_oa_meeting_info \r\n" +
" where id="+back.getMeetingId()+"))) t1\r\n" +
" left join t_oa_meeting_feedback f on t1.id=f.personId and f.meetingId="+back.getMeetingId()+") t\r\n" +
" GROUP BY t.result";
return super.executeQuery(sql, pageBean);
}MeetingFeedBackAction：
//会议反馈详情
public String queryMeetingBackByMeetingId(HttpServletRequest req, HttpServletResponse resp) {
try {
PageBean pageBean=new PageBean();
pageBean.setRequest(req);
List<Map<String, Object>> lst = backDao.queryMeetingBackByMeetingId(back, pageBean);
// 注意：layui中的数据表格的格式
ResponseUtil.writeJson(resp, R.ok(0, "会议反馈详情数据查询成功",pageBean.getTotal(),lst));
} catch (Exception e) {
e.printStackTrace();
try {
ResponseUtil.writeJson(resp, R.error(0, "会议反馈详情数据查询失败"));
} catch (Exception e2) {
e2.printStackTrace();
}
}
return null;
}运行效果：
比如登录此（张强）账号，对 第8条 做出反馈：
说明张强是缺席的。
接着换登录 admin 账号：
在我的会议中查看 反馈详情：
我们就可以看到张强在缺席人员的列表中了！
为了准确性，接着我们测试 添加一些参会人员，比如张三，
我们登录 张三 账号：
现在是未读状态，点击参会：
会议反馈成功之后，再次切换 admin 账号，
在我的会议中查看 反馈详情：
那么 张三就出现在参会人员的列表中啦~