一對多關係式Hibernate中的重要知識.感覺在Hibernate學習中最重要的也是最難的問題就是配置文件了,對於Hibernate一對多關係的配置***.hbm.xml現總結如下：
﹤?xml version="1.0" encoding="gbk"?﹥ ﹤!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"﹥ ﹤hibernate-mapping package="此處填寫包文件" ﹥ ﹤class name="一對多中一的實體類的類名" table="所對應的資料庫的表名" ﹥ ﹤id name="所對應的實體類的屬性(id)" column="所對應的數據表的欄位(**_id)" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ ﹤/id﹥ ﹤property name="對應數據表中其他的欄位" ﹥﹤/property﹥ ﹤set name="對應實體類中的那個集合的屬性" inverse="true" lazy="true" cascade="save-update" ﹥﹤key column="對應其外鍵的欄位 "/﹥﹤one-to-many class="對應一對多中多的實體類的類名"/﹥ ﹤/set﹥﹤/class﹥﹤class name="對應一對多中多的實體類的類名" table="相對應的數據表名" ﹥ ﹤id name="id" column="對應表的主鍵欄位名" unsaved-value="null" ﹥ ﹤generator class="native"/﹥﹤/id﹥﹤property name="對應數據表中的其他欄位" ﹥﹤/property﹥﹤many-to-one name="對應一對多中一的實體類的屬性" column="對應實體類中的那個集合的屬性" ﹥﹤/many-to-one﹥﹤/class﹥﹤/hibernate-mapping﹥ |
Hibernate一對多關係的配置代碼如下：
﹤!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"﹥ ﹤hibernate-mapping package="entity.test" ﹥ ﹤class name="Person" table="Person1" ﹥ ﹤id name="pid" column="p_id" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ ﹤/id﹥ ﹤property name="name" ﹥﹤/property﹥ ﹤set name="computers" inverse="true" lazy="true" cascade="save-update" ﹥ ﹤key column="p_id"/﹥ ﹤one-to-many class="Computer"/﹥ ﹤/set﹥ ﹤/class﹥ ﹤class name="Computer" table="Computer" ﹥ ﹤id name="id" column="c_id" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ ﹤/id﹥ ﹤property name="name" ﹥﹤/property﹥ ﹤many-to-one name="person" column="p_id" ﹥﹤/many-to-one﹥ ﹤/class﹥ ﹤/hibernate-mapping﹥ ﹤!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"﹥ ﹤hibernate-mapping package="entity.test" ﹥ ﹤class name="Person" table="Person1" ﹥ ﹤id name="pid" column="p_id" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ ﹤/id﹥ ﹤property name="name" ﹥﹤/property﹥ ﹤set name="computers" inverse="true" lazy="true" cascade="save-update" ﹥ ﹤key column="p_id"/﹥ ﹤one-to-many class="Computer"/﹥ ﹤/set﹥ ﹤/class﹥ ﹤class name="Computer" table="Computer" ﹥ ﹤id name="id" column="c_id" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ ﹤/id﹥ ﹤property name="name" ﹥﹤/property﹥ ﹤many-to-one name="person" column="p_id" ﹥﹤/many-to-one﹥ ﹤/class﹥ ﹤/hibernate-mapping﹥ |
整個的Hibernate技術就是圍繞著配置文件去發展.
[火星人 ] Hibernate一對多關係的處理已經有465次圍觀
