hibernate一对一映射关系
2017-09-12 11:33
295 查看
一、需求: 用户与身份证信息
一条用户记录对应一条身份证信息! 一对一的关系!
设计数据库:
JavaBean:
映射:
二、基于外键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
// 身份证号(主键)
private String cardNum;// 对象唯一表示(Object Identified, OID)
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 用户
public class User {
private int userId;
private String userName;
// 用户与身份证信息, 一对一关系
private IdCard idCard;</span>
IdCard.hbm.xml有外键方:
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="IdCard" table="t_IdCard">
<id name="cardNum">
<generator class="assigned"></generator>
</id>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
unique="true" 给外键字段添加唯一约束
-->
<many-to-one name="user" unique="true" column="user_id" class="User" cascade="save-update"></many-to-one>
</class>
</hibernate-mapping></span>
User.hbm.xml无外键方
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
三、基于主键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
private int user_id;
// 身份证号
private String cardNum;
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
IdCard.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="IdCard" table="t_IdCard">
<id name="user_id">
<!--
id 节点指定的是主键映射, 即user_id是主键
主键生成方式: foreign 即把别的表的主键作为当前表的主键;
property (关键字不能修改)指定引用的对象 对象的全名 cn..User、 对象映射 cn.User.hbm.xml、 table(id)
-->
<generator class="foreign">
<param name="property">user</param>
</generator>
</id>
<property name="cardNum" length="20"></property>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
(基于主键的映射)
constrained="true" 指定在主键上添加外键约束
-->
<one-to-one name="user" class="User" constrained="true" cascade="save-update"></one-to-one>
</class>
</hibernate-mapping>
</span>
User.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
一、需求: 用户与身份证信息
一条用户记录对应一条身份证信息! 一对一的关系!
设计数据库:
JavaBean:
映射:
二、基于外键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
// 身份证号(主键)
private String cardNum;// 对象唯一表示(Object Identified, OID)
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 用户
public class User {
private int userId;
private String userName;
// 用户与身份证信息, 一对一关系
private IdCard idCard;</span>
IdCard.hbm.xml有外键方:
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="IdCard" table="t_IdCard">
<id name="cardNum">
<generator class="assigned"></generator>
</id>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
unique="true" 给外键字段添加唯一约束
-->
<many-to-one name="user" unique="true" column="user_id" class="User" cascade="save-update"></many-to-one>
</class>
</hibernate-mapping></span>
User.hbm.xml无外键方
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
三、基于主键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
private int user_id;
// 身份证号
private String cardNum;
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
IdCard.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="IdCard" table="t_IdCard">
<id name="user_id">
<!--
id 节点指定的是主键映射, 即user_id是主键
主键生成方式: foreign 即把别的表的主键作为当前表的主键;
property (关键字不能修改)指定引用的对象 对象的全名 cn..User、 对象映射 cn.User.hbm.xml、 table(id)
-->
<generator class="foreign">
<param name="property">user</param>
</generator>
</id>
<property name="cardNum" length="20"></property>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
(基于主键的映射)
constrained="true" 指定在主键上添加外键约束
-->
<one-to-one name="user" class="User" constrained="true" cascade="save-update"></one-to-one>
</class>
</hibernate-mapping>
</span>
User.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
一条用户记录对应一条身份证信息! 一对一的关系!
设计数据库:
JavaBean:
映射:
二、基于外键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
// 身份证号(主键)
private String cardNum;// 对象唯一表示(Object Identified, OID)
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 用户
public class User {
private int userId;
private String userName;
// 用户与身份证信息, 一对一关系
private IdCard idCard;</span>
IdCard.hbm.xml有外键方:
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="IdCard" table="t_IdCard">
<id name="cardNum">
<generator class="assigned"></generator>
</id>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
unique="true" 给外键字段添加唯一约束
-->
<many-to-one name="user" unique="true" column="user_id" class="User" cascade="save-update"></many-to-one>
</class>
</hibernate-mapping></span>
User.hbm.xml无外键方
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
三、基于主键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
private int user_id;
// 身份证号
private String cardNum;
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
IdCard.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="IdCard" table="t_IdCard">
<id name="user_id">
<!--
id 节点指定的是主键映射, 即user_id是主键
主键生成方式: foreign 即把别的表的主键作为当前表的主键;
property (关键字不能修改)指定引用的对象 对象的全名 cn..User、 对象映射 cn.User.hbm.xml、 table(id)
-->
<generator class="foreign">
<param name="property">user</param>
</generator>
</id>
<property name="cardNum" length="20"></property>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
(基于主键的映射)
constrained="true" 指定在主键上添加外键约束
-->
<one-to-one name="user" class="User" constrained="true" cascade="save-update"></one-to-one>
</class>
</hibernate-mapping>
</span>
User.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
一、需求: 用户与身份证信息
一条用户记录对应一条身份证信息! 一对一的关系!
设计数据库:
JavaBean:
映射:
二、基于外键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
// 身份证号(主键)
private String cardNum;// 对象唯一表示(Object Identified, OID)
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 用户
public class User {
private int userId;
private String userName;
// 用户与身份证信息, 一对一关系
private IdCard idCard;</span>
IdCard.hbm.xml有外键方:
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="IdCard" table="t_IdCard">
<id name="cardNum">
<generator class="assigned"></generator>
</id>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
unique="true" 给外键字段添加唯一约束
-->
<many-to-one name="user" unique="true" column="user_id" class="User" cascade="save-update"></many-to-one>
</class>
</hibernate-mapping></span>
User.hbm.xml无外键方
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
三、基于主键的映射
[java] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;">// 身份证
public class IdCard {
private int user_id;
// 身份证号
private String cardNum;
private String place; // 身份证地址
// 身份证与用户,一对一的关系
private User user;</span>
IdCard.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="IdCard" table="t_IdCard">
<id name="user_id">
<!--
id 节点指定的是主键映射, 即user_id是主键
主键生成方式: foreign 即把别的表的主键作为当前表的主键;
property (关键字不能修改)指定引用的对象 对象的全名 cn..User、 对象映射 cn.User.hbm.xml、 table(id)
-->
<generator class="foreign">
<param name="property">user</param>
</generator>
</id>
<property name="cardNum" length="20"></property>
<property name="place" length="20"></property>
<!--
一对一映射,有外键方
(基于主键的映射)
constrained="true" 指定在主键上添加外键约束
-->
<one-to-one name="user" class="User" constrained="true" cascade="save-update"></one-to-one>
</class>
</hibernate-mapping>
</span>
User.hbm.xml
[html] view
plain copy
print?
<span style="font-family:KaiTi_GB2312;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.lfsenior.c_one2one2">
<class name="User" table="t_user">
<id name="userId">
<generator class="native"></generator>
</id>
<property name="userName" length="20"></property>
<!--
一对一映射: 没有外键方
-->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>
</hibernate-mapping>
</span>
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