Hibernate 关联映射个人略述

单向多对一关联：只有在一边配置关联映射。。而另外一边不管。。

??????????? 案例(一个父亲拥有多个孩子)

父亲类

?

public class Father implements Serializable {private static final long serialVersionUID = -8390304441273897145L;public Father(){}//父亲IDprivate Integer fatherId;//父亲姓名private String fatherName;public Integer getFatherId() {return fatherId;}public void setFatherId(Integer fatherId) {this.fatherId = fatherId;}public String getFatherName() {return fatherName;}public void setFatherName(String fatherName) {this.fatherName = fatherName;}}

一方：?配置关联映射

<hibernate-mapping package="net.jsp.orm"><class name="Father" table="FATHER"><id name="fatherId" column="FATHERID" type="java.lang.Integer"><generator /></id><property name="fatherName" column="FATHERNAME" type="java.lang.String" /></class></hibernate-mapping>

?

孩子类

public class Child implements Serializable {private static final long serialVersionUID = 6750561728903621833L;public Child(){}private Integer childId;private String childName;//多对一private Father father;public Integer getChildId() {return childId;}public void setChildId(Integer childId) {this.childId = childId;}public String getChildName() {return childName;}public void setChildName(String childName) {this.childName = childName;}public Father getFather() {return father;}public void setFather(Father father) {this.father = father;}}

?多方：配置关联映射

<hibernate-mapping package="net.jsp.orm"><class name="Child" table="CHILD"><id name="childId" column="CHILDID"><generator /></id><property name="childName" column="CHILDNAME" /><!-- 多方的配置   --><many-to-one name="father" column="FATHERID" /></class></hibernate-mapping>

?双向多对一关联：即在父亲类也添加一个孩子对象。。那么概念即(一个孩子或许有多个父亲[养父...]) 。配置如同上面的多方配置关联。。。。

?

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单向一对多关联：

???????? 如同上代码。。将 Child的 Father 对象去掉。 然后再Father? 类中添加 set<Child> childs属性 即可。一方配置关联映射如下：

<hibernate-mapping package="net.jsp.orm"><class name="Father" table="FATHER"><id name="fatherId" column="FATHERID" type="java.lang.Integer"><generator /></id><property name="fatherName" column="FATHERNAME" type="java.lang.String" /><set name="childs" ><key column="fatherId" /><one-to-many name="code"><!-- 用户方的关联配置 --><hibernate-mapping><class name="net.jsp.orm.User" table="[USER]"><id name="uid" column="UID"><generator /></id><property name="uname" column="UNAME" type="string"not-null="true" length="50"/><property name="upass" type="string"><column name="UPASS" not-null="true" length="50" /></property><set name="messages" table="TEMP_USER_MSG"><key column="TEMP_USERID" /><many-to-many column="TEMP_MSGID" /></set>                ..............</class></hibernate-mapping>

?

<!-- 消息方的关联配置 --><hibernate-mapping><class name="net.jsp.orm.Message" table="[Message]"><id name="msgId" column="MSGID"><generator /></id><property name="msgContent" column="MSGCONTENT" type="string"not-null="true" />    <set name="users" table="TEMP_USER_MSG"><key column="TEMP_USERID" /><many-to-many column="TEMP_MSGID" /></set>               ........</class></hibernate-mapping>

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