下面給大家介紹下mybatis結果生成鍵值對的實例代碼，具體內容如下所示：
在實際應用中我們經常會遇到這樣的情況，需要給下拉框賦值，這個時候就需要鍵值對了，具體使用方法如下
1，在maper.xml文件中定義結果類型(resultType)定義為hashmap,如下所示
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<select id="selectSuperUnitInfo" resultType="hashmap"> SELECT unit_id ,unit_name from unit_info </select> |
2，在對應的mapper類中用List<Map<String,String>>來接受這個類型，如下所示
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public List<Map<String,String>> selectSuperUnitInfo(); |
其實最強大的莫過于resultMap類型了，這個可以在mapper.xml文件中自定義擴展類型，然后在包中添加這個類型即可，真是強大
下面給大家補充下MyBatis返回Map鍵值對數據
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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, 地面沖洗[DEBUG] 2016-08-29 17:50:10 :<== Row: two, 邊界圍擋[DEBUG] 2016-08-29 17:50:10 :<== Row: three, 垃圾覆蓋[DEBUG] 2016-08-29 17:50:10 :<== Row: four, 裸地覆蓋[DEBUG] 2016-08-29 17:50:10 :<== Row: five, 灑水降塵[DEBUG] 2016-08-29 17:50:10 :<== Row: six, 車輛沖洗[DEBUG] 2016-08-29 17:50:10 :<== Row: seven, 建筑渣土[DEBUG] 2016-08-29 17:50:10 :<== Row: eight, 車輛冒裝[DEBUG] 2016-08-29 17:50:10 :<== Row: nine, 揚塵覆蓋[DEBUG] 2016-08-29 17:50:10 :<== Row: ten, 車輛撒漏[DEBUG] 2016-08-29 17:50:10 :<== Row: eleven, 車輛黑煙[DEBUG] 2016-08-29 17:50:10 :<== Row: twelve, 道路積塵<br> |
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[{"NAME":"地面沖洗","name":"地面沖洗","code":"one","CODE":"one"},{"NAME":"邊界圍擋","name":"邊界圍擋","code":"two","CODE":"two"},{"NAME":"垃圾覆蓋","name":"垃圾覆蓋","code":"three","CODE":"three"},{"NAME":"裸地覆蓋","name":"裸地覆蓋","code":"four","CODE":"four"},{"NAME":"灑水降塵","name":"灑水降塵","code":"five","CODE":"five"},{"NAME":"車輛沖洗","name":"車輛沖洗","code":"six","CODE":"six"},{"NAME":"建筑渣土","name":"建筑渣土","code":"seven","CODE":"seven"},{"NAME":"車輛冒裝","name":"車輛冒裝","code":"eight","CODE":"eight"},{"NAME":"揚塵覆蓋","name":"揚塵覆蓋","code":"nine","CODE":"nine"},{"NAME":"車輛撒漏","name":"車輛撒漏","code":"ten","CODE":"ten"},{"NAME":"車輛黑煙","name":"車輛黑煙","code":"eleven","CODE":"eleven"},{"NAME":"道路積塵","name":"道路積塵","code":"twelve","CODE":"twelve"}] |
返回的結果帶有大寫與小寫的key
如果在sql語句中的列名使用大寫會怎樣呢？自己測試一下吧！如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
