大型运输行业实战_day07_2

大型运输行业实战_day07_2_数据字典实现

1.数据字典表

1 CREATE TABLE `dic` (
2   `id` int(32) NOT NULL AUTO_INCREMENT,
3   `table_name` varchar(225) DEFAULT NULL,
4   `field_name` varchar(225) DEFAULT NULL,
5   `field_value` varchar(225) DEFAULT NULL,
6   `field_describe` varchar(225) DEFAULT NULL,
7   `describe` varchar(225) DEFAULT NULL,
8   PRIMARY KEY (`id`)
9 ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

2. DicMap.java类

 1 package com.day02.sation.map;
 2 
 3 import com.day02.sation.dao.IDicDao;
 4 import com.day02.sation.model.Dic;
 5 import org.springframework.context.ApplicationContext;
 6 import org.springframework.context.support.ClassPathXmlApplicationContext;
 7 
 8 import java.util.HashMap;
 9 import java.util.List;
10 import java.util.Map;
11 
12 /**
13  * Created by Administrator on 1/3.
14  */
15 
16 public class DicMap {
17 
18     private static IDicDao dicDao;
19 
20     private static Map<String, String> map = new HashMap();
21 
22     static {
23         //获取应用上下文对象
24         ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-config.xml");
25         //获取dicDao实例
26         dicDao = ctx.getBean(IDicDao.class);
27         //调用方法初始化字典
28         addMapValue();
29     }
30 
31     public static String getFieldDetail(String tableName, String fieldName, String filedValue) {
32         String key = tableName + "_" + fieldName + "_" + filedValue;
33         String value = map.get(key);
34         if (value == null) { //如果 value 为空 重新查询数据库
35             Dic dicQuery = new Dic();
36             Dic dic = dicDao.getDic(dicQuery);
37             if (dic != null) {//数据有该值
38                 String fieldDescribe = dic.getFieldDescribe();
39                 map.put(key, fieldDescribe);
40                 return fieldDescribe;
41             }
42             value = "暂无";
43         }
44         return value;
45     }
46 
47     /**
48      * 初始化字典数据
49      */
50     private static void addMapValue() {
51         List<Dic> list = dicDao.getList();
52         for (int i = 0; i < list.size(); i++) {
53             Dic dic = list.get(i);
54             String tableName = dic.getTableName();
55             String fieldName = dic.getFieldName();
56             String fieldValue = dic.getFieldValue();
57             String key = tableName + "_" + fieldName + "_" + fieldValue;
58             String fieldDescribe = dic.getFieldDescribe();
59             map.put(key, fieldDescribe);
60         }
61 
62     }
63 }

3.dao接口

 1     /**
 2      * 获取字典列表
 3      * @return
 4      */
 5     List<Dic> getList();
 6 
 7     /**
 8      * 根据 key 获取字典值
 9      * @param dic
10      * @return
11      */
12     Dic getDic(Dic dic);

4.mapper映射文件

 1  <!--查询字典列表-->
 2    <select id="getList" resultType="com.day02.sation.model.Dic">
 3        SELECT d.id, d.table_name tableName, d.field_name fieldName, d.field_value fieldValue,
 4        d.field_describe fieldDescribe, d.`describe` FROM dic AS d
 5    </select>
 6     <!--根据key获取字典值-->
 7     <select id="getDic" parameterType="com.day02.sation.model.Dic" resultType="com.day02.sation.model.Dic">
 8         SELECT d.id, d.table_name tableName, d.field_name fieldName, d.field_value fieldValue,
 9         d.field_describe fieldDescribe, d.`describe` FROM dic AS d
10         WHERE d.table_name=#{tableName} AND d.field_name=#{fieldName} AND  d.field_value=#{fieldValue}
11     </select>

5.在模型中使用

6.页面显示

7.浏览器中使用firbug查看返回数据

8.页面显示效果

到此字典使用完毕!