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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                有了實體層的支持,下面,我們開始寫DAO層。有了前面TeacherDao的代碼示例,再寫KlassDao相對就簡單些了。寫代碼之前,我們先畫圖。 ![https://box.kancloud.cn/6f72a773fd655ea106cc97a8bee19919_1196x986.png](https://box.kancloud.cn/6f72a773fd655ea106cc97a8bee19919_1196x986.png) 和TeacherDao一樣,我們需要繼承AbstractDao,然后實現DAO接口中的getFeatruedClass中的方法。 按類圖,我們新建KlassDao, 并使用Astah生成以下JAVA代碼。 ``` package com.mengyunzhi.javaee.dao; /** * 班級 */ public class KlassDao extends AbstractDao { private static final long serialVersionUID = 1L; /** * 傳入實體類 */ @Override public Class<Klass> getFeaturedClass() { return null; } } ``` 然后,我們補充實體類. ``` package com.mengyunzhi.javaee.dao; import com.mengyunzhi.javaee.entity.Klass; /** * 班級 */ public class KlassDao extends AbstractDao { private static final long serialVersionUID = 1L; /** * 傳入實體類 */ @Override public Class<Klass> getFeaturedClass() { return Klass.class; } } ``` # 測試 為了更清楚的展示我們的測試思路,在這,我們仍然給出時序圖。 ![https://box.kancloud.cn/c0415890ea903d2bb430bd43f7ed71bf_978x392.png](https://box.kancloud.cn/c0415890ea903d2bb430bd43f7ed71bf_978x392.png) 然后按照時序圖,進行代碼的編寫。 ``` package com.mengyunzhi.javaee.daoTest; import org.junit.Test; import com.mengyunzhi.javaee.dao.KlassDao; import com.mengyunzhi.javaee.entity.Klass; public class KlassTest { @Test public void create() { // 存數 Klass klass = new Klass("一四班", 1); KlassDao klassDao = new KlassDao(); Long klassId = (Long) klassDao.create(klass); System.out.println("存入的ID為:" + klassId); // 取數 Klass saveKlass = (Klass) klassDao.get(klassId); System.out.println(saveKlass); } } ``` 控制臺將得到如下信息: ``` 存入的ID為:9 Hibernate: select klass0_.klassId as klassId1_0_0_, klass0_.name as name2_0_0_, klass0_.teacherId as teacherI3_0_0_ from Klass klass0_ where klass0_.klassId=? Klass [klassId=9, name=一四班, teacherId=1] ``` 然后我們使用navicat查看數據表,以確認數據的確已經被傳入: ![https://box.kancloud.cn/d69c4707bff6923c81505d0247d4009e_590x78.png](https://box.kancloud.cn/d69c4707bff6923c81505d0247d4009e_590x78.png) 至此,以第二節的時序圖為基礎,在建立DAO層文件并測試完畢。
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