大型运输行业实战_day07_2_数据字典实现

1.数据字典表

 CREATE TABLE `dic` (
   `id` int(32) NOT NULL AUTO_INCREMENT,
   `table_name` varchar(225) DEFAULT NULL,
   `field_name` varchar(225) DEFAULT NULL,
   `field_value` varchar(225) DEFAULT NULL,
   `field_describe` varchar(225) DEFAULT NULL,
   `describe` varchar(225) DEFAULT NULL,
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

2. DicMap.java类

 package com.day02.sation.map;

 import com.day02.sation.dao.IDicDao;
 import com.day02.sation.model.Dic;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 /**
  * Created by Administrator on 1/3.
  */

 public class DicMap {

     private static IDicDao dicDao;

     private static Map<String, String> map = new HashMap();

     static {
         //获取应用上下文对象
         ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-config.xml");
         //获取dicDao实例
         dicDao = ctx.getBean(IDicDao.class);
         //调用方法初始化字典
         addMapValue();
     }

     public static String getFieldDetail(String tableName, String fieldName, String filedValue) {
         String key = tableName + "_" + fieldName + "_" + filedValue;
         String value = map.get(key);
         if (value == null) { //如果 value 为空 重新查询数据库
             Dic dicQuery = new Dic();
             Dic dic = dicDao.getDic(dicQuery);
             if (dic != null) {//数据有该值
                 String fieldDescribe = dic.getFieldDescribe();
                 map.put(key, fieldDescribe);
                 return fieldDescribe;
             }
             value = "暂无";
         }
         return value;
     }

     /**
      * 初始化字典数据
      */
     private static void addMapValue() {
         List<Dic> list = dicDao.getList();
         for (int i = 0; i < list.size(); i++) {
             Dic dic = list.get(i);
             String tableName = dic.getTableName();
             String fieldName = dic.getFieldName();
             String fieldValue = dic.getFieldValue();
             String key = tableName + "_" + fieldName + "_" + fieldValue;
             String fieldDescribe = dic.getFieldDescribe();
             map.put(key, fieldDescribe);
         }

     }
 }

3.dao接口

     /**
      * 获取字典列表
      * @return
      */
     List<Dic> getList();

     /**
      * 根据 key 获取字典值
      * @param dic
      * @return
      */
     Dic getDic(Dic dic);

4.mapper映射文件

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