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!