我有三张表，即personalinfo，groups_designation，groups_desig_category
实际上我在两个表中都有数据（personalinfo，groups_designation）。所以我们提供了一个屏幕。用户可以选择该组并将个人ID和数据分配到groups_desig_category表中。在这种情况下，我映射为
Personal.hbm.xml:-
<set name="empwthgrp" inverse="true" lazy="true" table="groups_desig_category">
<key>
<column name="pid" not-null="true" />
</key>
<many-to-many entity-name="com.aims.beans.DesignationGroupBean">
<column name="gid" not-null="true" />
</many-to-many>
</set>
Personal.java:-
/**
*
*/
private static final long serialVersionUID = 1L;
private int pid,deptno;
private String name,designation;
private Address address;
private Address permentaddress;
private Set famildtlslst;
private Set empwthgrp=new HashSet();
public Set getEmpwthgrp() {
return empwthgrp;
}
public void setEmpwthgrp(Set empwthgrp) {
this.empwthgrp = empwthgrp;
}
public Set getFamildtlslst() {
return famildtlslst;
}
public void setFamildtlslst(Set famildtlslst) {
this.famildtlslst = famildtlslst;
}
public Address getPermentaddress() {
return permentaddress;
}
public void setPermentaddress(Address permentaddress) {
this.permentaddress = permentaddress;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public int getDeptno() {
return deptno;
}
public void setDeptno(int deptno) {
this.deptno = deptno;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getDesignation() {
return designation;
}
public void setDesignation(String designation) {
this.designation = designation;
}
GroupingDesig.hbm.xml： -
<class name="beans.DesignationGroupBean" table="groups_designation" proxy=beans.DesignationGroupBean">
<id name="gid" column="gid" type="java.lang.Integer">
<generator class="sequence"><param name="sequence">gid_seq</param> </generator>
</id>
<property name="gname" type="java.lang.String" column="gname" not-null="true" />
<property name="description" type="java.lang.String" column="description" not-null="true" />
<set name="grpwthemp" inverse="true" lazy="true" table="groups_desig_category">
<key>
<column name="gid" not-null="true" />
</key>
<many-to-many entity-name="com.aims.beans.Personal">
<column name="pid" not-null="true" />
</many-to-many>
</set>
</class>
DesignationGroupBean.java： -
private int gid;
private String gname,description;
private Set grpwthemp=new HashSet();
public Set getGrpwthemp() {
return grpwthemp;
}
public void setGrpwthemp(Set grpwthemp) {
this.grpwthemp = grpwthemp;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getGid() {
return gid;
}
public void setGid(int gid) {
this.gid = gid;
}
public String getGname() {
return gname;
}
public void setGname(String gname) {
this.gname = gname;
}
其实我在尝试session.saveOrUpdate（pBean）。但它不能正常工作。可以改变一对多和多对一而不是多对多的关系。我认为它不适合这种情况那么，如何处理这种情况？。如果你使用逆向工程，那么它创建为一对多和多对一的关系？为什么？。请帮帮我。
更新： -
我实现了一对多和多对一关系的休眠，而在数据库中实现了它的多对多关系。然后它的工作正常并在下面粘贴了一对多关系的hibernate映射文件
GroupingDesig.hbm.xml： -
<set name="grpwthemp" inverse="true" lazy="true" table="groups_desig_category">
<key>
<column name="gid" not-null="true" />
</key>
<one-to-many class="com.aims.beans.GroupAssignment"/>
<!-- <many-to-many entity-name="com.aims.beans.Personal">
<column name="pid" not-null="true" />
</many-to-many>-->
</set>
Personal.hbm.xml
<set name="empwthgrp" inverse="true" lazy="true" table="groups_desig_category">
<key>
<column name="pid" not-null="true" />
</key>
<one-to-many class="com.aims.beans.GroupAssignment"/>
<!--
<many-to-many entity-name="com.aims.beans.DesignationGroupBean">
<column name="gid" not-null="true" />
</many-to-many>-->
</set>
AssigGroupingDesig.hbm.xml： -
<many-to-one name="personal" column="pid" class="com.aims.beans.Personal" not-null="true"></many-to-one>
<many-to-one name="desigdt" column="gid" class="com.aims.beans.DesignationGroupBean" not-null="true"></many-to-one>
何时会出现关系船的图片？我在网上搜索多对多关系的例子，即。
请帮帮我。我的问题是什么时候会实时出现/使用多对多关系？
更新2： -
Thanks.Removing逆标记它的工作正常。但我怀疑删除查询的生成。请检查日志
/* load com.beans.Personal */ select personal0_.pid as pid0_, personal0_.name as name5_0_, personal0_.DEPTNO as DEPTNO5_0_, personal0_.designation as designat4_5_0_, personal0_.pddress1 as pddress5_5_0_, personal0_.pddress2 as pddress6_5_0_, personal0_.pcity as pcity5_0_, personal0_.pstate as pstate5_0_, personal0_1_.HomeAddress1 as HomeAddr2_7_0_, personal0_1_.HomeAddress2 as HomeAddr3_7_0_, personal0_1_.homecity as homecity7_0_, personal0_1_.homestate as homestate7_0_ from personalinfo personal0_, address personal0_1_ where personal0_.pid=personal0_1_.pid and personal0_.pid=?
delete collection com.beans.Personal.empwthgrp */ delete from groups_desig_category where pid=?
insert collection row com.beans.Personal.empwthgrp */ insert into groups_desig_category (pid, gid) values (?, ?)
为什么要生成“从group_desig_category删除pid =？”。。Plz帮帮我
更新3： -
是的。我使用session.get.becuase加载数据我对一些必填字段有异常。这就是我加载数据然后更新记录的原因
per=(Personal)session.get(Personal.class,new Integer(pBean.getPid()));
per.setEmpwthgrp(pBean.getEmpwthgrp());
session.saveOrUpdate(per);
答案 0 :(得分：1)
在您的多对多映射中，您将两者设置为反向。您需要选择一个拥有关系的实体 - 对于该实体，在映射中，您将删除inverse="true"设置。这将是一个实体，在保存或更新时，将使该人员保持团体关系。
由于您在问题中发布了saveOrUpdate(pBean)，并且我认为pBean是Personal实体，因此您需要删除inverse="true"中的Personal.hbm.xml设置。