hibernate 映射关系（快速原型）_1
此方法在快速建立项目原型上有很大帮助（这最关键的就是速度，用的好原型很快就能建立起来）
先确定下“快速原型”环境定义：
使用：ant+hibernate_xdoclet+hibernate_create_table
过程：定义bean(xdoclet) -> hbm映射文件 -> hibernate.hbm2ddl.auto create -> 逻辑
注意：如有使用泛型，请使用 > xjavadoc-1.1.jar
build.xml
ant配置文件
hibernate.hbm.xml
下面就详细介绍了第一个
单项一对多
1.先定义bean
2.运行 ant hibernate 得到 hbm 映射文件
3.Main 运行测试
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import util.HibernateUtil;
import bean.unidirectional.m2o.Address;
import bean.unidirectional.m2o.Person;
public class Main {
public static void main(String[] args) {
Session session1 = HibernateUtil.currentSession();
Transaction t1 = session1.beginTransaction();
// insert
Address address1 = new Address();
Address address2 = new Address();
Person person1 = new Person();
Person person2 = new Person();
person1.setAddress(address1);
person2.setAddress(address1);
Person person3 = new Person();
person3.setAddress(address2);
session1.save(address1);
session1.save(address2);
session1.save(person1);
session1.save(person2);
session1.save(person3);
t1.commit();
// 查询有重复的 address
Session session2 = HibernateUtil.currentSession();
Query query = session2.createQuery(
" select ta from " +
Address. class .getName() + " ta , " +
Person. class .getName() + " tp " +
" where ta.id=tp.address " +
" group by ta.id having count(ta.id)>1 "
);
List < Address > list = query.list();
for (Address atmp : list ){
System.out.println( atmp.getId() );
}
}
}
数据库：
mysql> show tables ;
+-----------------------+
| Tables_in_hbm |
+-----------------------+
| address |
| person |
+-----------------------+
结果：
Hibernate: insert into Address values ( )
Hibernate: insert into Address values ( )
Hibernate: insert into Person (addressId) values (?)
Hibernate: insert into Person (addressId) values (?)
Hibernate: insert into Person (addressId) values (?)
Hibernate: select address0_.id as id from Address address0_, Person person1_ where address0_.id=person1_.addressId group by address0_.id having count(address0_.id)>1
1
当然我这文章主要是映射关系，下面我们就进主题，大家想尝试下可以使用上面的原型快速测试： 参考（在此我对参考加入了自己的注解，希望能给大家帮助。对于在实际开发中不常见或难以实现的我们就不介绍了）
# 这里 当 ddl主键对象 会多出 n条 被外键对象的 update
# 解决办法修改映射为双向，并且 set-inverse = "false"并且 在代码中‘孩子.set父亲()’和 ‘ 父亲 .add 孩子 () ’ 一定要写明
# 如果不希望硬代码 就 set- inverse ="true" ‘ 父亲 .add 孩子 () ’在生成sql 中就会有多余的update
# 当然根据逻辑情况来选择
/**
* @hibernate.class
*
*/
public class Person {
private int id;
private Set < Address > addresss;
/**
* @hibernate.id
* generator-class = "native"
* @return
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.set inverse = "false"
* @hibernate.collection-key column ="personId"
* @hibernate.collection-one-to-many class = "bean.unidirectional.m2o.Address"
*/
public Set < Address > getAddresss() {
return addresss;
}
public void setAddresss(Set < Address > addresss) {
this .addresss = addresss;
}
}
/**
* @hibernate.class
* @author root
*
*/
public class Address {
private int id;
private Person person ;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.many-to-one
* column = "personId"
* @return
*/
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this .person = person;
}
}
public static void main(String[] args) {
Session session1 = HibernateUtil.currentSession();
Transaction t1 = session1.beginTransaction();
// insert
Address address1 = new Address();
Address address2 = new Address();
Set < Address > addresss = new HashSet < Address > ();
addresss.add(address1);
addresss.add(address2);
Person person1 = new Person();
person1.setAddresss(addresss);
address1.setPerson(person1);
address2.setPerson(person1);
session1.save(person1);
session1.save(address1);
session1.save(address2);
t1.commit();
// 查询有重复的 address
Session session2 = HibernateUtil.currentSession();
Query query = session2.createQuery(
" from " + Person. class .getName() + " tp "
);
List < Person > list = query.list();
for (Person ptmp : list ){
for ( Address atmp : ptmp.getAddresss() ){
System.out.println(atmp.getId());
}
}
结果： 干净的 insert
mysql :
mysql> select * from address ;
+----+----------+
| id | personId |
+----+----------+
| 1 | 1 |
| 2 | 1 |
+----+----------+
2 rows in set (0.00 sec)
整理 www.blogjava.net/Good-Game
先确定下“快速原型”环境定义：
使用：ant+hibernate_xdoclet+hibernate_create_table
过程：定义bean(xdoclet) -> hbm映射文件 -> hibernate.hbm2ddl.auto create -> 逻辑
注意：如有使用泛型，请使用 > xjavadoc-1.1.jar
build.xml
<?
xml version="1.0" encoding="UTF-8"
?>
< project >
< property file ="build-dist.properties" />
< path id ="class.path" >
< fileset dir ="${ant.lib.dir}" >
< include name ="*.jar" />
</ fileset >
< fileset dir ="${project.lib.dir}" >
< include name ="*.jar" />
</ fileset >
</ path >
<!-- =================================================================== -->
<!-- Initialise -->
<!-- =================================================================== -->
< target name ="init" >
< taskdef name ="hibernatedoclet" classname ="xdoclet.modules.hibernate.HibernateDocletTask" classpathref ="class.path" />
</ target >
<!-- =================================================================== -->
<!-- Invoke XDoclet's hibernate -->
<!-- =================================================================== -->
< target name ="hibernate" depends ="init" >
< echo > +---------------------------------------------------+ </ echo >
< echo > | | </ echo >
< echo > | R U N N I N G H I B E R N A T E D O C L E T | </ echo >
< echo > | | </ echo >
< echo > +---------------------------------------------------+ </ echo >
< hibernatedoclet destdir ="${config.dir}" mergedir ="${config.dir}" excludedtags ="@version,@author,@todo,@see" addedtags ="@xdoclet-generated at ${TODAY},@copyright The XDoclet Team,@author XDoclet,@version ${version}" force ="${samples.xdoclet.force}" verbose ="false" >
< fileset dir ="${src.dir}" >
< include name ="bean/**/*.java" />
</ fileset >
< hibernate version ="3.0" />
</ hibernatedoclet >
</ target >
</ project >
< project >
< property file ="build-dist.properties" />
< path id ="class.path" >
< fileset dir ="${ant.lib.dir}" >
< include name ="*.jar" />
</ fileset >
< fileset dir ="${project.lib.dir}" >
< include name ="*.jar" />
</ fileset >
</ path >
<!-- =================================================================== -->
<!-- Initialise -->
<!-- =================================================================== -->
< target name ="init" >
< taskdef name ="hibernatedoclet" classname ="xdoclet.modules.hibernate.HibernateDocletTask" classpathref ="class.path" />
</ target >
<!-- =================================================================== -->
<!-- Invoke XDoclet's hibernate -->
<!-- =================================================================== -->
< target name ="hibernate" depends ="init" >
< echo > +---------------------------------------------------+ </ echo >
< echo > | | </ echo >
< echo > | R U N N I N G H I B E R N A T E D O C L E T | </ echo >
< echo > | | </ echo >
< echo > +---------------------------------------------------+ </ echo >
< hibernatedoclet destdir ="${config.dir}" mergedir ="${config.dir}" excludedtags ="@version,@author,@todo,@see" addedtags ="@xdoclet-generated at ${TODAY},@copyright The XDoclet Team,@author XDoclet,@version ${version}" force ="${samples.xdoclet.force}" verbose ="false" >
< fileset dir ="${src.dir}" >
< include name ="bean/**/*.java" />
</ fileset >
< hibernate version ="3.0" />
</ hibernatedoclet >
</ target >
</ project >
ant配置文件
# 当然根据你自己的项目路径
ant.lib.dir = C:\\src\\test\\hbmTest\\action\\lib
project.lib.dir = C:\\src\\test\\hbmTest\\lib
src.dir = C:\\src\\test\\hbmTest\\src
config.dir = C:\\src\\test\\hbmTest\\config
ant.lib.dir = C:\\src\\test\\hbmTest\\action\\lib
project.lib.dir = C:\\src\\test\\hbmTest\\lib
src.dir = C:\\src\\test\\hbmTest\\src
config.dir = C:\\src\\test\\hbmTest\\config
hibernate.hbm.xml
<?
xml version="1.0" encoding="UTF-8"
?>
<! DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
< hibernate-configuration >
< session-factory >
< property name ="hibernate.connection.driver_class" > org.gjt.mm.mysql.Driver </ property >
< property name ="connection.url" >
<![CDATA[
jdbc:mysql://localhost:3306/hbm?characterEncoding=utf8&connectionCollation=gbk_chinese_ci
]]>
</ property >
< property name ="hibernate.connection.username" > root </ property >
< property name ="hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ property >
< property name ="hibernate.connection.password" >****** </ property >
<property name="hibernate.hbm2ddl.auto">create</property>
< property name ="hibernate.show_sql" > true </ property >
<!-- 映射添加 -->
< mapping resource ="bean\unidirectional\m2o\Person.hbm.xml" />
< mapping resource ="bean\unidirectional\m2o\Address.hbm.xml" />
</ session-factory >
</ hibernate-configuration >
<! DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
< hibernate-configuration >
< session-factory >
< property name ="hibernate.connection.driver_class" > org.gjt.mm.mysql.Driver </ property >
< property name ="connection.url" >
<![CDATA[
jdbc:mysql://localhost:3306/hbm?characterEncoding=utf8&connectionCollation=gbk_chinese_ci
]]>
</ property >
< property name ="hibernate.connection.username" > root </ property >
< property name ="hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ property >
< property name ="hibernate.connection.password" >****** </ property >
<property name="hibernate.hbm2ddl.auto">create</property>
< property name ="hibernate.show_sql" > true </ property >
<!-- 映射添加 -->
< mapping resource ="bean\unidirectional\m2o\Person.hbm.xml" />
< mapping resource ="bean\unidirectional\m2o\Address.hbm.xml" />
</ session-factory >
</ hibernate-configuration >
下面就详细介绍了第一个
单项一对多
1.先定义bean
package
bean.unidirectional.m2o;
/**
* @hibernate.class
*/
public class Person {
private int id;
private Address address;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.many-to-one column = "addressId" not-null = "true"
*/
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this .address = address;
}
}
/**
* @hibernate.class
*/
public class Person {
private int id;
private Address address;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.many-to-one column = "addressId" not-null = "true"
*/
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this .address = address;
}
}
package
bean.unidirectional.m2o;
/**
* @hibernate.class
*/
public class Address {
private int id;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
}
/**
* @hibernate.class
*/
public class Address {
private int id;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
}
2.运行 ant hibernate 得到 hbm 映射文件
3.Main 运行测试
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import util.HibernateUtil;
import bean.unidirectional.m2o.Address;
import bean.unidirectional.m2o.Person;
public class Main {
public static void main(String[] args) {
Session session1 = HibernateUtil.currentSession();
Transaction t1 = session1.beginTransaction();
// insert
Address address1 = new Address();
Address address2 = new Address();
Person person1 = new Person();
Person person2 = new Person();
person1.setAddress(address1);
person2.setAddress(address1);
Person person3 = new Person();
person3.setAddress(address2);
session1.save(address1);
session1.save(address2);
session1.save(person1);
session1.save(person2);
session1.save(person3);
t1.commit();
// 查询有重复的 address
Session session2 = HibernateUtil.currentSession();
Query query = session2.createQuery(
" select ta from " +
Address. class .getName() + " ta , " +
Person. class .getName() + " tp " +
" where ta.id=tp.address " +
" group by ta.id having count(ta.id)>1 "
);
List < Address > list = query.list();
for (Address atmp : list ){
System.out.println( atmp.getId() );
}
}
}
数据库：
mysql> show tables ;
+-----------------------+
| Tables_in_hbm |
+-----------------------+
| address |
| person |
+-----------------------+
结果：
Hibernate: insert into Address values ( )
Hibernate: insert into Address values ( )
Hibernate: insert into Person (addressId) values (?)
Hibernate: insert into Person (addressId) values (?)
Hibernate: insert into Person (addressId) values (?)
Hibernate: select address0_.id as id from Address address0_, Person person1_ where address0_.id=person1_.addressId group by address0_.id having count(address0_.id)>1
1
当然我这文章主要是映射关系，下面我们就进主题，大家想尝试下可以使用上面的原型快速测试： 参考（在此我对参考加入了自己的注解，希望能给大家帮助。对于在实际开发中不常见或难以实现的我们就不介绍了）
单向一对一（one to one）
#通过外键关联
<class name="Person">
<id name="id" column="personId">
<generator class="native"/>
</id>
<many-to-one name="address"
column="addressId"
unique="true"
not-null="true"/>
</class>
<class name="Address">
<id name="id" column="addressId">
<generator class="native"/>
</id>
</class>
create table Person ( personId bigint not null primary key, addressId bigint not null unique )
create table Address ( addressId bigint not null primary key )
#通过主键关联（请注意，例子中掉换了关联的方向
）
<class name = " Person " >
<id name = " id " column = " personId " >
<generator class = " native " />
</id>
</class>
<class name = " Address " >
<id name = " id " column = " personId " >
<generator class ="foreign">
<param name="property" >person</param>
</generator>
</id>
<one-to-one name = " person " constrained = " true " />
</class>
create table Person ( personId bigint not null primary key )
create table Address ( personId bigint not null primary key )
<class name = " Person " >
<id name = " id " column = " personId " >
<generator class = " native " />
</id>
</class>
<class name = " Address " >
<id name = " id " column = " personId " >
<generator class ="foreign">
<param name="property" >person</param>
</generator>
</id>
<one-to-one name = " person " constrained = " true " />
</class>
create table Person ( personId bigint not null primary key )
create table Address ( personId bigint not null primary key )
单向一对多（one to many）
<class name
=
"
Person
"
>
<id name = " id " column = " personId " >
<generator class = " native " />
</id>
<set name ="addresses">
<key column="personId" not-null="true"/>
<one-to-many class="Address" />
</set>
</class>
<class name = " Address " >
<id name = " id " column = " addressId " >
<generator class = " native " />
</id>
</class>
create table Person ( personId bigint not null primary key )
create table Address ( addressId bigint not null primary key , personId bigint not null
<id name = " id " column = " personId " >
<generator class = " native " />
</id>
<set name ="addresses">
<key column="personId" not-null="true"/>
<one-to-many class="Address" />
</set>
</class>
<class name = " Address " >
<id name = " id " column = " addressId " >
<generator class = " native " />
</id>
</class>
create table Person ( personId bigint not null primary key )
create table Address ( addressId bigint not null primary key , personId bigint not null
# 这里 当 ddl主键对象 会多出 n条 被外键对象的 update
# 解决办法修改映射为双向，并且 set-inverse = "false"并且 在代码中‘孩子.set父亲()’和 ‘ 父亲 .add 孩子 () ’ 一定要写明
# 如果不希望硬代码 就 set- inverse ="true" ‘ 父亲 .add 孩子 () ’在生成sql 中就会有多余的update
# 当然根据逻辑情况来选择
/**
* @hibernate.class
*
*/
public class Person {
private int id;
private Set < Address > addresss;
/**
* @hibernate.id
* generator-class = "native"
* @return
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.set inverse = "false"
* @hibernate.collection-key column ="personId"
* @hibernate.collection-one-to-many class = "bean.unidirectional.m2o.Address"
*/
public Set < Address > getAddresss() {
return addresss;
}
public void setAddresss(Set < Address > addresss) {
this .addresss = addresss;
}
}
/**
* @hibernate.class
* @author root
*
*/
public class Address {
private int id;
private Person person ;
/**
* @hibernate.id generator-class = "native"
*/
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
/**
* @hibernate.many-to-one
* column = "personId"
* @return
*/
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this .person = person;
}
}
public static void main(String[] args) {
Session session1 = HibernateUtil.currentSession();
Transaction t1 = session1.beginTransaction();
// insert
Address address1 = new Address();
Address address2 = new Address();
Set < Address > addresss = new HashSet < Address > ();
addresss.add(address1);
addresss.add(address2);
Person person1 = new Person();
person1.setAddresss(addresss);
address1.setPerson(person1);
address2.setPerson(person1);
session1.save(person1);
session1.save(address1);
session1.save(address2);
t1.commit();
// 查询有重复的 address
Session session2 = HibernateUtil.currentSession();
Query query = session2.createQuery(
" from " + Person. class .getName() + " tp "
);
List < Person > list = query.list();
for (Person ptmp : list ){
for ( Address atmp : ptmp.getAddresss() ){
System.out.println(atmp.getId());
}
}
结果： 干净的 insert
Hibernate:
insert
into
Person
values
( )
Hibernate: insert into Address values ( )
Hibernate: insert into Address values ( )
Hibernate: select person0_.id as id from Person person0_
1
2
Hibernate: insert into Address values ( )
Hibernate: insert into Address values ( )
Hibernate: select person0_.id as id from Person person0_
1
2
mysql :
mysql> select * from address ;
+----+----------+
| id | personId |
+----+----------+
| 1 | 1 |
| 2 | 1 |
+----+----------+
2 rows in set (0.00 sec)
整理 www.blogjava.net/Good-Game