hibernate对象间关系映射从入门到精通(多对多关系)

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1、主题：Hibernate对象间关系映射从入门到精通(多对多关系)相关文章:父子关系及inverse详解请问：Session被关闭了，为什么还能用？cascadeinverse推荐圈子:osworkflow更多相关推荐DescribeHibernate对象间关系映射从入门到精通(多对多关系)here.下面来谈一下多对多的关系：以老师和学生的关系为例子：<classname="com.etech.bm.po.TeacherPO"table="TEACHER"><idname="id"column="ID"type="integer">&l

2、t;generatorclass="identity"/></id><bagname="student"table="TEACHERSTUDENT"lazy="true"cascade="all"><keycolumn="TEACHERID"/><many-to-manyclass="com.etech.bm.po.StudentPO"column="STUDENTID"/></bag></class><classname="com.etech.bm.po.StudentPO

3、"table="STUDENT"><idname="id"column="ID"type="integer"><generatorclass="identity"/></id><bagname="teacher"table="TEACHERSTUDENT"lazy="true"cascade="all><keycolumn="STUDENTID"/><many-to-manyclass="com.etech.bm.po.TeacherPO"column="TEACHERID"/>&

4、lt;/bag></class>由工具自动生成的dll为droptableTEACHERSTUDENT;droptableTEACHER;droptableSTUDENT;createtableTEACHERSTUDENT(TEACHERIDINTEGERnotnull,STUDENTIDINTEGERnotnull,primarykey(TEACHERID,STUDENTID));createtableTEACHER(IDINTEGERnotnullgeneratedbydefaultasidentity,primarykey(ID));

5、createtableSTUDENT(IDINTEGERnotnullgeneratedbydefaultasidentity,primarykey(ID));altertableTEACHERSTUDENTaddconstraintFKFE10D819307EFC76foreignkey(STUDENTID)referencesSTUDENT;altertableTEACHERSTUDENTaddconstraintFKFE10D8198B06785Dforeignkey(TEACHERID)referencesTEACHER;程序ITxMgrtx=nul

6、l;tx=HibernateTxMgr.beginTrans("Addanewrelationships...");session=(Session)tx.getSession();student=newStudentPO();student1=newStudentPO();Liststudentlist=newArrayList();studentlist.add(student);studentlist.add(student1);teacher=newTeacherPO();teacher.setStudent(studentlist);session

7、.save(teacher);session.flush();tx.endTrans();生成的sqlHibernate:insertintoTEACHER(ID)values(default)Hibernate:insertintoSTUDENT(ID)values(default)Hibernate:insertintoSTUDENT(ID)values(default)Hibernate:insertintoTEACHERSTUDENT(TEACHERID,STUDENTID)values(?,?)结果C:MyappSQLLIBBIN>db

8、2select*fromstudentID-----