调查管理系统 -（7）设计调查选项处理&Answer实体的分析设计&开发的经验技巧&数据库使用等

 1 package com.atguigu.surveypark.model;
 2 import com.atguigu.surveypark.util.StringUtil;
 3 import com.atguigu.surveypark.util.ValidateUtil;
 4 /**
 5  * 问题类
 6  */
 7 public class Question {
 8     private static final String RN = "\r\n" ;
 9     private Integer id;//主键id
10     private int questionType;// 题型0-8
11     private String title;//问题题干
12     private String options;//选项
13     private String[] optionArr ;
14     private boolean other;// 其他项
15     private int otherStyle;// 其他项样式:0-无 1-文本框 2-下拉列表
16     // 其他项下拉选项
17     private String otherSelectOptions;
18     private String[] otherSelectOptionArr ;
19     // 矩阵式行标题集
20     private String matrixRowTitles;
21     private String[] matrixRowTitleArr ;
22     // 矩阵式列标题集
23     private String matrixColTitles;
24     private String[] matrixColTitleArr ;
25     // 矩阵是下拉选项集
26     private String matrixSelectOptions;
27     private String[] matrixSelectOptionArr ;
28     private Page page;  //建立从Question到Page之间多对一关联关系
29     /**
30      * 重写setOptions方法完成字符串拆分
31      */
32     public void setOptions(String options) {
33         this.options = options;
34         this.optionArr = StringUtil.str2Arr(options, RN);
35     }
36     //省略了其它的getter与setter方法
37 }

1 //将字符串转换成数组,按照tag分割
2 public static String[] str2Arr(String str,String tag){
3     if(ValidateUtil.isValid(str)){
4         return str.split(tag);
5     }
6     return null ;
7 }

 1 package com.atguigu.surveypark.model;
 2 import java.util.Date;
 3 /**
 4  * Answer
 5  */
 6 public class Answer {
 7     private Integer id;
 8     private String answerIds;// 选项的索引.
 9     private String otherAnswer; //其它项
10     private String uuid;// 批次.
11     private Date answerTime;
12 
13     private Integer questionId;// 关联字段
14     // 关联字段：页面id(冗余)。注：教程中没有给出该字段是为了演示Hibernate的数据库写操作问题
15     //private Integer pageId;
16     private Integer surveyId;// 关联字段：调查id(冗余)--为提高效率而增加的特殊字段
17     //省略了getter与setter  
18 }

 1 /**
 2  * 删除survey,同时删除page,问题,答案
 3  */
 4 public void deleteSurvey(Integer sid){
 5     //delete answers
 6     String hql = "delete from Answer a where a.surveyId = ?" ;
 7     answerDao.batchEntityByHQL(hql,sid);
 8     //hibernate在写操作中,不允许两级以上的链接.
 9     //hql = "delete from Question q where q.page.survey.id = ?" ;
10     hql = "delete from Question q where q.page.id in (select p.id from Page p where p.survey.id = ?)" ;
11     questionDao.batchEntityByHQL(hql, sid);
12     //delete page
13     hql = "delete from Page p where p.survey.id = ? " ;
14     pageDao.batchEntityByHQL(hql, sid);
15     //delete survey
16     hql = "delete from Survey s where s.id = ?" ;
17     surveyDao.batchEntityByHQL(hql, sid);
18 }

1 String hql = "update Survey s set s.closed = !s.closed where s.id = ?" ;//这种写法是错误的。
2 surveyDao.batchEntityByHQL(hql,sid); 

1 Survey s = this.getSurvey(sid);
2 String hql = "update Survey s set s.closed = ? where s.id = ?" ;
3 surveyDao.batchEntityByHQL(hql,!s.isClosed(),sid);