Mybatis结果生成键值对

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PHP中文网的支持！

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