Mybatis结果生成键值对的实例代码
投稿:mrr
这篇文章主要介绍了Mybatis结果生成键值对的实例代码,以及MyBatis返回Map键值对数据的实现方法,非常不错,具有参考借鉴价值,需要的的朋友参考下
下面给大家介绍下mybatis结果生成键值对的实例代码,具体内容如下所示:
在实际应用中我们经常会遇到这样的情况,需要给下拉框赋值,这个时候就需要键值对了,具体使用方法如下
1,在maper.xml文件中定义结果类型(resultType)定义为hashmap,如下所示
<select id="selectSuperUnitInfo" resultType="hashmap"> SELECT unit_id ,unit_name from unit_info </select>
2,在对应的mapper类中用List<Map<String,String>>来接受这个类型,如下所示
public List<Map<String,String>> selectSuperUnitInfo();
其实最强大的莫过于resultMap类型了,这个可以在mapper.xml文件中自定义扩展类型,然后在包中添加这个类型即可,真是强大
下面给大家补充下MyBatis返回Map键值对数据
List<Map<String, String>> getMtypeList(); <select id="getMtypeList" resultType="java.util.HashMap"> select code,`name` from jk_control_measure </select>
[DEBUG] 2016-08-29 17:50:09 :==> Executing: select code,`name` from jk_control_measure [DEBUG] 2016-08-29 17:50:09 :==> Parameters: [DEBUG] 2016-08-29 17:50:10 :<== Columns: code, name [DEBUG] 2016-08-29 17:50:10 :<== Row: one, 地面冲洗 [DEBUG] 2016-08-29 17:50:10 :<== Row: two, 边界围挡 [DEBUG] 2016-08-29 17:50:10 :<== Row: three, 垃圾覆盖 [DEBUG] 2016-08-29 17:50:10 :<== Row: four, 裸地覆盖 [DEBUG] 2016-08-29 17:50:10 :<== Row: five, 洒水降尘 [DEBUG] 2016-08-29 17:50:10 :<== Row: six, 车辆冲洗 [DEBUG] 2016-08-29 17:50:10 :<== Row: seven, 建筑渣土 [DEBUG] 2016-08-29 17:50:10 :<== Row: eight, 车辆冒装 [DEBUG] 2016-08-29 17:50:10 :<== Row: nine, 扬尘覆盖 [DEBUG] 2016-08-29 17:50:10 :<== Row: ten, 车辆撒漏 [DEBUG] 2016-08-29 17:50:10 :<== Row: eleven, 车辆黑烟 [DEBUG] 2016-08-29 17:50:10 :<== Row: twelve, 道路积尘
[{"NAME":"地面冲洗","name":"地面冲洗","code":"one","CODE":"one"}, {"NAME":"边界围挡","name":"边界围挡","code":"two","CODE":"two"}, {"NAME":"垃圾覆盖","name":"垃圾覆盖","code":"three","CODE":"three"}, {"NAME":"裸地覆盖","name":"裸地覆盖","code":"four","CODE":"four"}, {"NAME":"洒水降尘","name":"洒水降尘","code":"five","CODE":"five"}, {"NAME":"车辆冲洗","name":"车辆冲洗","code":"six","CODE":"six"}, {"NAME":"建筑渣土","name":"建筑渣土","code":"seven","CODE":"seven"}, {"NAME":"车辆冒装","name":"车辆冒装","code":"eight","CODE":"eight"}, {"NAME":"扬尘覆盖","name":"扬尘覆盖","code":"nine","CODE":"nine"}, {"NAME":"车辆撒漏","name":"车辆撒漏","code":"ten","CODE":"ten"}, {"NAME":"车辆黑烟","name":"车辆黑烟","code":"eleven","CODE":"eleven"}, {"NAME":"道路积尘","name":"道路积尘","code":"twelve","CODE":"twelve"} ]
返回的结果带有大写与小写的key
如果在sql语句中的列名使用大写会怎样呢?自己测试一下吧!如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!