Hibernate 关联映射之多对一

Hibernate的关联映射包括：

一对一（Persion - IDCard）

一对多—epartment - Employee）

多对一（Employee - Department）

多对多（Teacher - Student）

组件映射（User - Name）

集合映射（Set、List、Map）

inverse和cascade（Employee - Department）

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本文以多对一为例：

多个员工对应一个部门（Employee - Department）

映射文件 <many-to-one name="depart" column="depart_id">

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实体类：Department.java 和 Employee.java

CREATE TABLE `department` (  `id` int(11) NOT NULL auto_increment,  `name` varchar(255) default NULL,  PRIMARY KEY  (`id`)) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1CREATE TABLE `employee` (  `id` int(11) NOT NULL auto_increment,  `name` varchar(255) default NULL,  `dept` int(11) default NULL,  PRIMARY KEY  (`id`),  KEY `FK4AFD4ACE66A70F4E` (`dept`),  CONSTRAINT `FK4AFD4ACE66A70F4E` FOREIGN KEY (`dept`) REFERENCES `department` (`id`)) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1 

mysql> desc department;
+-------+--------------+------+-----+---------+----------------+
| Field | Type???????? | Null | Key | Default | Extra????????? |
+-------+--------------+------+-----+---------+----------------+
| id??? | int(11)????? | NO?? | PRI | NULL??? | auto_increment |
| name? | varchar(255) | YES? |???? | NULL??? |??????????????? |
+-------+--------------+------+-----+---------+----------------+
mysql> desc employee;
+-------+--------------+------+-----+---------+----------------+
| Field | Type???????? | Null | Key | Default | Extra????????? |
+-------+--------------+------+-----+---------+----------------+
| id??? | int(11)????? | NO?? | PRI | NULL??? | auto_increment |
| name? | varchar(255) | YES? |???? | NULL??? |??????????????? |
| dept? | int(11)????? | YES? | MUL | NULL??? |??????????????? |
+-------+--------------+------+-----+---------+----------------+

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