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
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<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
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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
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List<Map<String, String>> getMtypeList();<select id="getMtypeList" resultType="java.util.HashMap"> select code,`name` from jk_control_measure</select> |
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[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<br> |
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[{"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服务器之家网站的支持！
