cascade="save-update" 与 inverse="true"使用讲解（回钦波）
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
? <class table="T_FormField" name="com.nqyw.oa.model.FormField">
??? <id name="id">
????? <generator name="items">
?????? <key column="formfieldId"></key>
?????? <list-index column="itemIndex"></list-index>
?????? <composite-element encoding="ISO-8859-1"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
? <class table="T_FlowForm" name="com.nqyw.oa.model.FlowForm">
??? <id name="id">
????? <generator cascade="save-update"? name="fields">
??????? <key column="flowformId"></key>
??????? <one-to-many 和 inverse="true" ,表示我父（FlowForm.java)爸爸要负责维护子的关系，
SQL语句是：
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
如果没有cascade="save-update",的话，保存父（FlowForm.java)时 子类（FormField.java)是不能被保存的。
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如果有 ：cascade="save-update"?而没有?inverse="true" ,表示我父（FlowForm.java)爸爸要负责维护子的关系，
SQL语句是：
Hibernate: insert into T_FlowForm (template) values (?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: insert into T_FormField (fieldName, fieldLabel, fieldType, fieldInput, flowForm) values (?, ?, ?, ?, ?)
Hibernate: update T_FormField set flowformId=? where id=?
Hibernate: update T_FormField set flowformId=? where id=?
Hibernate: update T_FormField set flowformId=? where id=?
Hibernate: update T_FormField set flowformId=? where id=?
多了四条是因为父类这边在添加完父子下，还要更新管理下子类。所以最好加上??inverse="true"。这样会提高效率
如果没有cascade="save-update",的话，保存父（FlowForm.java)时 子类（FormField.java)是不能被保存的。
