Mybatis结果生成键值对的实例代码

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网站的支持！