[转]hibernate 集合类（Collections）映射（四）- map
四、Map集合映射
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Map集合属性不仅需要映射属性value，还需要映射属性key。这里假设Employee的name属性是唯一的，如下修改Employee.hbm.xml配置文件中的name属性，设置unique='true'：
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Java代码
<property name="name"?
<property name="name"?
Java代码
public?
?????????//setter和getter方法??
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}?
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public?
?????????//setter和getter方法
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}?
Xml代码
<?xml version="1.0"?>?
<!DOCTYPE hibernate-mapping PUBLIC???
??????<hibernate-mapping?????????????????????????????????????????????????????????????????????????????????????</hibernate-mapping>?
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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
??????<hibernate-mapping?????????????????????????????????????????????????????????????????????</hibernate-mapping>?
Java代码
//List<Employee> list= new ArrayList<Employee>();??
//?????????//??????????????????????????????????????????????????????
//List<Employee> list= new ArrayList<Employee>();
//????????//?????????????????????????????????????????????????
emps:{employee1 name1?
数据库表中记录如下所示（未发生变化）：
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mysql> select * from department;
+----+-----------------+
| id | name???????????+----+-----------------+
|?+----+-----------------+
1 row in set (0.00 sec)
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mysql> select * from employee;
+----+-----------------+-----------+
| id | name???????????+----+-----------------+-----------+
|?|?+----+-----------------+-----------+
2 rows in set (0.00 sec)
