hibernate一对多关联

实体之间有三种关系:

1.一对一

2.一对多

3.多对一

一对多

goods类

package entity;
/*
* 货物表
* */
public class goods {
private int gid;
private long gnum;
private inventory inv;
public int getGid() {
return gid;
}
public void setGid(int gid) {
this.gid = gid;
}
public long getGnum() {
return gnum;
}
public void setGnum(long gnum) {
this.gnum = gnum;
}
public inventory getInv() {
return inv;
}
public void setInv(inventory inv) {
this.inv = inv;
}

}

配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entity.goods" table="goods">
<id name="gid" column="gid">
<generator class="native"/>
</id>
<property name="gnum" column="gnum"></property>
<many-to-one name="inv" column="igid" class="entity.inventory"></many-to-one>

<!--

<many-to-one>标签

name :关联对象的属性的名称.

column :表中的外键名称.

class :关联对象类的全路径

-->

</class>
</hibernate-mapping>

inventory类

package entity;

import java.util.HashSet;

import java.util.Set;

* 清单表

* */

public class inventory {

private int iid;

private String iname;

//private int igid;

private Set<goods> goodses=new HashSet<goods>();

public int getIid() {

return iid;

}

public void setIid(int iid) {

this.iid = iid;

}

public String getIname() {

return iname;

}

public void setIname(String iname) {

this.iname = iname;

}

//public int getIgid() {

//return igid;

//}

//public void setIgid(int igid) {

//this.igid = igid;

//}

public Set<goods> getGoodses() {

return goodses;

}

public void setGoodses(Set<goods> goodses) {

this.goodses = goodses;

}

配置

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

</id>

<one-to-many class="entity.goods"/>

</set>

</class>

</hibernate-mapping>