Hibernate一對多關(guān)系的處理
一對多關(guān)系式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，對于Hibernate一對多關(guān)系的配置***.hbm.xml現(xiàn)總結(jié)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(yīng)的數(shù)據(jù)庫的表名" ﹥
﹤id name="所對應(yīng)的實體類的屬性(id)" column="所對應(yīng)的數(shù)據(jù)表的字段(**_id)" ﹤set name="對應(yīng)實體類中的那個集合的屬性" ﹤id name="id" column="對應(yīng)表的主鍵字段名" unsaved-value="null" ﹥ ﹤generator class="native"/﹥ |
Hibernate一對多關(guān)系的配置代碼如下：
﹤!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(shù)就是圍繞著配置文件去發(fā)展。
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