component映射
在hibernate中,component是某个实体的逻辑组成部分，它与实体的根本区别是没有oid，
component可以成为是值对象（DDD）
采用component映射的好处：它实现了对象模型的细粒度划分，层次会更分明，复用率会更高
<class name="com.bjsxt.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<component name="contact">
<property name="email"/>
<property name="address"/>
<property name="zipCode"/>
<property name="contactTel"/>
</component>
</class>
对应表还是一张User表只是对象力度细分
User user = new User();
user.setName("张三");
Contact contact = new Contact();
contact.setAddress("xxxxx");
contact.setEmail("xxx@rrr.com");
contact.setZipCode("1111111");
contact.setContactTel("9999999999");
user.setContact(contact);
session.save(user);
复合主键映射
复合（联合）主键映射
通常将复合主键相关的属性，单独放到一个类中
* 此类必须实现序列化接口
* 覆写hashcode和equals方法
public class FiscalYearPeriodPK implements Serializable {
//核算年
private int fiscalYear;
//核算月
private int fiscalPeriod;
public int getFiscalYear() {
return fiscalYear;
}
public void setFiscalYear(int fiscalYear) {
this.fiscalYear = fiscalYear;
}
public int getFiscalPeriod() {
return fiscalPeriod;
}
public void setFiscalPeriod(int fiscalPeriod) {
this.fiscalPeriod = fiscalPeriod;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + fiscalPeriod;
result = prime * result + fiscalYear;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final FiscalYearPeriodPK other = (FiscalYearPeriodPK) obj;
if (fiscalPeriod != other.fiscalPeriod)
return false;
if (fiscalYear != other.fiscalYear)
return false;
return true;
}
}
<class name="com.bjsxt.hibernate.FiscalYearPeriod" table="t_fiscal_year_period">
<composite-id name="fiscalYearPeriodPK">
<key-property name="fiscalYear"/>
<key-property name="fiscalPeriod"/>
</composite-id>
<property name="beginDate"/>
<property name="endDate"/>
<property name="periodSts"/>
</class>
在继承映射中如果class的abstract属性设成true就不会生成表
set
list
array
map
t_CollectionMapping
|
id |
name |
|
1 |
xxx |
t_set_values
|
set_id |
set_value |
|
1 |
a |
|
1 |
b |
t_list_value
|
list_id |
list_value |
list_index |
|
1 |
c |
0 |
|
1 |
d |
1 |
t_array_value
|
array_id |
array_value |
array_index |
|
1 |
e |
0 |
|
1 |
f |
1 |
t_map_value
|
map_id |
map_key |
map_value |
|
1 |
k1 |
v1 |
|
1 |
k2 |
v2 |
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="setValue" table="t_set_value">
<key column="set_id"/>
<element type="string" column="set_value"/>
</set>
<list name="listValue" table="t_list_value">
<key column="list_id"/>
<list-index column="list_index"/>//为了保存顺序
<element type="string" column="list_value"/>
</list>
<array name="arrayValue" table="t_array_value">
<key column="array_id"/>
<list-index column="array_index"/>
<element type="string" column="array_value"/>
</array>
<map name="mapValue" table="t_map_value">
<key column="map_id"/>
<map-key type="string" column="map_key"/>
<element type="string" column="map_value"/>
</map>
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