hibernate 关联映射配置 1． Hibernate关联关系映射目录 │ ├─单向关联 │ ├

文件名称: hibernate 关联映射配置

所属分类: Java

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上传时间: 2011-08-03

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详细说明： 1． Hibernate关联关系映射目录 │ ├─单向关联 │ ├─ 一对一外键单向关联 │ ├─ 一对一主键单向关联 │ ├─ 一对一连接表单向关联 │ ├─ 一对多外键单向关联 │ ├─ 一对多连接表单向关联 │ ├─ 多对一外键单向关联 │ ├─ 多对一连接表单向关联 │ └─ 多对多单向关联 └─双向关联 ├─ 一对一外键双向关联 ├─ 一对一主键双向关联 ├─ 一对一连接表双向关联 ├─ 一对多外键双向关联 ├─ 一对多连接表双向关联 └─ 多对多双向关联 4．1 一对一外键单向关联模型一个人（Person）对应一个地址（address）实体：表模型 address +----------------+----------------+------+------+----------+-------------------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------------- +------+------+----------+-------------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +----------------+-------------- +-------+------+-----------+------------------+ person; +-----------+------------------+------+------+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +-----------+-----------------+-------+------+---------+-------------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | | addressId | int(11) | YES | UNI | NULL | | +----------- +--------------+------+-----+---------+----------------------+ 映射方法：在Person中添加Address属性，映射配置为： 4．2一对一主键单向关联 1-1的关联可以基于主键关联，但基于主键关联的持久化类不能拥有自己的主键生成策略，它的主键由关联类负责生成。另外，增加one-to-one元素来关联属性，必须为one-to-one元素增加constrained="true"属性，表明该类主键由关联类生成。模型：一个人（Person）对应一个地址（Address）实体：表模型 address +----------------+----------------+------+------+----------+-------------------+ | Field | Type | Null | Key | Default | Extra | +----------------+----------------+------+------+----------+-------------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +----------------+-------------- +-------+------+-----------+------------------+ person; +------------+----------------+------+------+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +------------ +---------------+-------+------+---------+-------------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | | addressId | int(11) | YES | UNI | NULL | | +------------ +--------------+------+-----+---------+----------------------+ 映射方法：在Person中配置id生成策略为： address ...... address 4．3 一对一连接表单向关联这种情况很少见，但Hibernate同样允许采用连接表关联1-1.有连接表的1-1同样只需要将N-1的many-to-one元素增加unique="true"属性即可。表结构 address; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ join; +--------------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+---------+------+-----+---------+-------+ | personid | int(11) | NO | PRI | | | | address11tab | int(11) | YES | UNI | NULL | | +--------------+---------+------+-----+---------+-------+ person; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ 映射方法：在Person中添加Address属性，映射配置为： 4．4 一对多外键单向关联这种情况很少见，但Hibernate同样允许采用连接表关联1-1.有连接表的1-1同样只需要将N-1的many-to-one元素增加unique="true"属性即可。模型介绍一个人（Person）对应多个地址（Address），比如家庭地址、公司地址。实体（省略getter、setter方法） public class Person1nfk implements Serializable { private int personid; private String name; private int age; private Set addresses=new HashSet(); ｝ public class Address1nfk implements Serializable { private int addressid; private String addressdetail; ｝表模型 address; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | | personid | int(11) | YES | MUL | NULL | | +---------------+--------------+------+-----+---------+----------------+ person; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ 映射方法：在实体类Person里面添加Address的集合，即可形成一对多关系。 4．6 多对一外键单向关联模型介绍多个人（Person）对应一个地址（Address）。实体（省略getter、setter方法） public class Personn { private int personid; private String name; private int age; private Addressn addressn; ｝ public class Addressn { private int addressid; private String addressdetail; ｝表模型 address_n1kf; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ Person; +-----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | | addressId | int(11) | YES | MUL | NULL | | +-----------+--------------+------+-----+---------+----------------+ 映射方法 4．7 多对一连接表单向关联模型介绍多个人（Person）对应一个地址（Address）。实体（省略getter、setter方法） public class Personn1tab { private int personid; private String name; private int age; private Addressn1tab addressn1tab; public class Addressn1tab { private int addressid; private String addressdetail; 表模型 Address; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ Join; +------------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+---------+------+-----+---------+-------+ | personid | int(11) | NO | PRI | | | | addressn1tab | int(11) | YES | MUL | NULL | | +------------+---------+------+-----+---------+-------+ person; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ 映射方法 4．8多对多单向关联模型介绍一个人可对应多个地址，一个地址也可以对应多个人。实体（省略getter、setter方法） public class Personnn { private int personid; private String name; private int age; private Set addresses=new HashSet(); ｝ public class Addressnn { private int addressid; private String addressdetail; ｝表模型 mysql> desc person_nn; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ mysql> desc join_nn; +-----------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------+------+-----+---------+-------+ | personid | int(11) | NO | PRI | | | | addressid | int(11) | NO | PRI | | | +-----------+---------+------+-----+---------+-------+ mysql> desc person_nn; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ 映射方法 4．9 一对一外键双向关联一对一外键关联是一对多外键关联的特例，只是在多的一方加了个唯一性约束。模型一个人对应一个地址。 /*===============================================*/ /* Table: address */ /*===============================================*/ create table address ( id bigint not null auto_increment comment 'ID', detail varchar(120) not null comment '详细地址', personid bigint comment '人的ID', primary key (id) ) /*==========================================*/ /* Table: person */ /*==========================================*/ create table person ( id bigint not null auto_increment comment 'ID', name varchar(24) not null comment '姓名', primary key (id) ) 对象模型 public class Person implements java.io.Serializable { private Long id; private String name; private Address address; ｝ public class Address implements java.io.Serializable { private Long id; private Person person; private String detail; ｝映射文件姓名详细地址人的ID root jdbc:mysql://localhost:3306/testdb org.hibernate.dialect.MySQLDialect xiaohui com.mysql.jdbc.Driver true true 4．10 一对一主键双向关联模型一个人Person 对应一个地址Address。数据模型和对象模型图 /*===============================================*/ /* Table: address */ /*==============================================*/ create table address ( id bigint not null comment 'ID', detail varchar(120) not null comment '详细地址', primary key (id) ) /*==============================================*/ /* Table: person */ /*= ============================================*/ create table person ( id bigint not null auto_increment comment 'ID', name varchar(24) not null comment '姓名', primary key (id) ) 对象模型代码 public class Person implements java.io.Serializable { private Long id; private String name; private Address address; ｝ public class Address implements java.io.Serializable { private Long id; private Person person; private String detail; ｝映射代码姓名 person 详细地址 Hibernate配置 root jdbc:mysql://localhost:3306/mydb org.hibernate.dialect.MySQLDialect xiaohui com.mysql.jdbc.Driver true true 4．11一对一连接表双向关联模型介绍一个人（Person）对应一个地址（Address）。二、实体（省略getter、setter方法） public class Person11tab_sx { private int personid; private String name; private int age; private Address11tab_sx address11tab_sx; public class Address11tab_sx { private int addressid; private String addressdetail; private Person11tab_sx person11tab_sx; 表模型 mysql> desc person_11tab_sx; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ mysql> desc join_11tab_sx; +-----------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------+------+-----+---------+-------+ | addressid | int(11) | NO | UNI | | | | personid | int(11) | NO | PRI | | | +-----------+---------+------+-----+---------+-------+ mysql> desc address_11tab_sx; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ 映射方法 4．12一对多外键双向关联模型介绍一个人（Person）对应多个地址（Address）。实体（省略getter、setter方法） public class Person1nfk_sx implements Serializable { private int personid; private String name; private int age; private Set addresses=new HashSet(); public class Address1nfk_sx implements Serializable { private int addressid; private String addressdetail; private Person1nfk_sx person1nfkSx; 表模型 mysql> desc person_1nfk_sx; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ mysql> desc address_1nfk_sx; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | | personid | int(11) | NO | MUL | | | +---------------+--------------+------+-----+---------+----------------+ 映射方法 4．13一对多连接表双向关联模型介绍一个人（Person）对应多个地址（Address）。实体（省略getter、setter方法） public class Person1ntab_sx { private int personid; private String name; private int age; private Set addresses=new HashSet(); ｝ public class Address1ntab_sx { private int addressid; private String addressdetail; private Person1ntab_sx person1ntab_sx; ｝表模型 mysql> desc person_1ntab_sx; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ mysql> desc address_1ntab_sx; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ mysql> desc join_1ntab_sx; +-----------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------+------+-----+---------+-------+ | addressid | int(11) | NO | PRI | | | | personid | int(11) | NO | PRI | | | +-----------+---------+------+-----+---------+-------+ 五、映射方法 4．14多对多双向关联模型介绍一个人可对应多个地址，一个地址也可以对应多个人。实体（省略getter、setter方法） public class Personnn_sx { private int personid; private String name; private int age; private Set addresses=new HashSet(); ｝ public class Addressnn_sx { private int addressid; private String addressdetail; private Set persons = new HashSet(); ｝表模型 mysql> desc person_nn_sx; +----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+----------------+ | personid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | age | int(11) | YES | | NULL | | +----------+--------------+------+-----+---------+----------------+ mysql> desc address_nn_sx; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | addressid | int(11) | NO | PRI | NULL | auto_increment | | addressdetail | varchar(255) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ mysql> desc join_nn_sx; +-----------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------+------+-----+---------+-------+ | addressid | int(11) | NO | PRI | | | | personid | int(11) | NO | PRI | | | +-----------+---------+------+-----+---------+-------+ 映射方法 ...展开收缩