我有三个表，即个人信息、groups_designation、groups_design_category
- 个人信息：pid（个人ID）
- groups_designation:gid(组 id)
- groups_design_category:gid,pid
实际上我在两个表中都有数据（个人信息，组_设计）。所以我们提供了一个屏幕。在那，用户选择组并分配个人ID，并将数据拉入groups_design_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;
}
实际上我正在尝试 session.saveOrUpdate(pBean)。但它不起作用。可能可以更改一对多和多对一而不是多对多关系。我认为它不适合这种情况。所以，在这种情况下如何处理？如果您使用逆向工程，那么它会创建为一对多和多对一的关系？为什么？请帮帮我。
更新：-
我是在一对多和多对一关系休眠中实现的，而在数据库中它是多对多关系。然后它工作正常，下面粘贴了具有一对多关系的休眠映射文件
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>
个人.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>
什么时候会出现关系船的图片？。我在网上搜索了多对多关系示例，即。
请帮我。我的问题是什么时候会实时出现/使用多对多关系？
更新 2：-
谢谢。删除反向标签它工作正常。但我对删除查询的生成有疑问。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 (?, ?)
为什么生成“从pid =的groups_desig_category中删除？”。请帮助我
更新 3：-
是的。我正在使用 session.get 加载数据。因为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);