[转]hibernate 集合类（Collections）映射（四）- 地图

[转]hibernate 集合类（Collections）映射（四）- map

四、Map集合映射

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'：

Java代码

<property name="name"?

Java代码

public?

?????????//setter和getter方法??

public?

?????????//setter和getter方法

Xml代码

<?xml version="1.0"?>?

<!DOCTYPE hibernate-mapping PUBLIC???

??????<hibernate-mapping?????????????????????????????????????????????????????????????????????????????????????</hibernate-mapping>?

<?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）：

mysql> select * from department;

+----+-----------------+

| id | name???????????+----+-----------------+

|?+----+-----------------+

1 row in set (0.00 sec)

mysql> select * from employee;

+----+-----------------+-----------+

| id | name???????????+----+-----------------+-----------+

|?|?+----+-----------------+-----------+

2 rows in set (0.00 sec)