hibernate复合主键及关联的实现

键字: 复合主键 关联

如果你不得不面对遗留系统老式的数据库复合主键,无法享受逻辑主键(代理主键)带来的幸福生活,那么使用CompositeUserType来处理复合主键是个不错的选择.废话少说,看看如何实现:

Java代码



/**

* $Revision: 1.0 $

* Created: 2008-1-11

* $Date: 2008-1-11 $

*

* Author: Keven Chen

*/

package com.comwave.ww_oa.webui.org;

import java.io.Serializable;

/**

* @author Keven Chen

* @version $Revision 1.0 $

*

*/

public class UserPositionId implements Serializable {

private String userId;

private String posId;

public UserPositionId(){}

public UserPositionId(String userId, String posId) {

this.userId = userId;

this.posId = posId;

}

public String getPosId() {

return posId;

}

public void setPosId(String posId) {

this.posId = posId;

}

public String getUserId() {

return userId;

}

public void setUserId(String userId) {

this.userId = userId;

}

public int hashCode() {

final int PRIME = 31;

int result = 1;

result = PRIME * result + ((posId == null) ? 0 : posId.hashCode());

result = PRIME * result + ((userId == null) ? 0 : userId.hashCode());

return result;

}

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

final UserPositionId other = (UserPositionId) obj;

if (posId == null) {

if (other.posId != null)

return false;

} else if (!posId.equals(other.posId))

return false;

if (userId == null) {

if (other.userId != null)

return false;

} else if (!userId.equals(other.userId))

return false;

return true;

}

}

/**
* $Revision: 1.0 $
* Created: 2008-1-11
* $Date: 2008-1-11 $
*
* Author: Keven Chen
*/
package com.comwave.ww_oa.webui.org;

import java.io.Serializable;

/**
* @author Keven Chen
* @version $Revision 1.0 $
*
*/
public class UserPositionId implements Serializable {
private String userId;

private String posId;

public UserPositionId(){}

public UserPositionId(String userId, String posId) {
this.userId = userId;
this.posId = posId;
}

public String getPosId() {
return posId;
}

public void setPosId(String posId) {
this.posId = posId;
}

public String getUserId() {
return userId;
}

public void setUserId(String userId) {
this.userId = userId;
}

public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + ((posId == null) ? 0 : posId.hashCode());
result = PRIME * result + ((userId == null) ? 0 : userId.hashCode());
return result;
}

public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final UserPositionId other = (UserPositionId) obj;
if (posId == null) {
if (other.posId != null)
return false;
} else if (!posId.equals(other.posId))
return false;
if (userId == null) {
if (other.userId != null)
return false;
} else if (!userId.equals(other.userId))
return false;
return true;
}

}

Java代码



/**

* $Revision: 1.0 $

* Created: 2008-1-11

* $Date: 2008-1-11 $

*

* Author: Keven Chen

*/

package com.comwave.ww_oa.webui.org;

import java.io.Serializable;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import org.hibernate.Hibernate;

import org.hibernate.HibernateException;

import org.hibernate.engine.SessionImplementor;

import org.hibernate.type.Type;

import org.hibernate.usertype.CompositeUserType;

/**

* @author Keven Chen

* @version $Revision 1.0 $

*

*/

public class UserPositionIdUserType implements CompositeUserType {

public Object assemble(Serializable cached, SessionImplementor session, Object owner)

throws HibernateException {

return deepCopy(cached);

}

public Object deepCopy(Object value) throws HibernateException {

UserPositionId id = (UserPositionId) value;

return new UserPositionId(id.getUserId(),id.getPosId());

}

public Serializable disassemble(Object value, SessionImplementor session)

throws HibernateException {

return (Serializable) deepCopy(value);

}

public boolean equals(Object x, Object y) throws HibernateException {

if (x==y) return true;

if (x==null || y==null) return false;

return x.equals(y);

}

public String[] getPropertyNames() {

return new String[] { "userId", "posId" };

}

public Type[] getPropertyTypes() {

return new Type[] { Hibernate.STRING, Hibernate.STRING };

}

public Object getPropertyValue(Object component, int property) throws HibernateException {

UserPositionId id = (UserPositionId) component;

return property == 0 ? id.getUserId() : id.getPosId();

}

public void setPropertyValue(Object component, int property, Object value)

throws HibernateException {

UserPositionId id = (UserPositionId) component;

if (property == 0) {

id.setUserId((String) value);

} else {

id.setPosId((String) value);

}

}

public int hashCode(Object x) throws HibernateException {

return x.hashCode();

}

public boolean isMutable() {

return true;

}

public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)

throws HibernateException, SQLException {

String userId = (String) Hibernate.STRING.nullSafeGet(rs, names[0]);

String posId = (String) Hibernate.STRING.nullSafeGet(rs, names[1]);

return new UserPositionId(userId,posId);

}

public void nullSafeSet(PreparedStatement st, Object value, int index,

SessionImplementor session) throws HibernateException, SQLException {

UserPositionId id = (UserPositionId) value;

String userId = (id == null) ? null : id.getUserId();

String posId = (id == null) ? null :id.getPosId();

Hibernate.STRING.nullSafeSet(st,userId, index);

Hibernate.STRING.nullSafeSet(st,posId, index+1);

}

public Object replace(Object original, Object target, SessionImplementor session, Object owner)

throws HibernateException {

return deepCopy(original); //TODO: improve

}

public Class returnedClass() {

return UserPositionId.class;

}

}

/**
* $Revision: 1.0 $
* Created: 2008-1-11
* $Date: 2008-1-11 $
*
* Author: Keven Chen
*/
package com.comwave.ww_oa.webui.org;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.type.Type;
import org.hibernate.usertype.CompositeUserType;

/**
* @author Keven Chen
* @version $Revision 1.0 $
*
*/
public class UserPositionIdUserType implements CompositeUserType {

public Object assemble(Serializable cached, SessionImplementor session, Object owner)
throws HibernateException {
return deepCopy(cached);
}

public Object deepCopy(Object value) throws HibernateException {
UserPositionId id = (UserPositionId) value;
return new UserPositionId(id.getUserId(),id.getPosId());
}

public Serializable disassemble(Object value, SessionImplementor session)
throws HibernateException {
return (Serializable) deepCopy(value);
}

public boolean equals(Object x, Object y) throws HibernateException {
if (x==y) return true;
if (x==null || y==null) return false;
return x.equals(y);
}

public String[] getPropertyNames() {
return new String[] { "userId", "posId" };
}

public Type[] getPropertyTypes() {
return new Type[] { Hibernate.STRING, Hibernate.STRING };
}

public Object getPropertyValue(Object component, int property) throws HibernateException {
UserPositionId id = (UserPositionId) component;
return property == 0 ? id.getUserId() : id.getPosId();
}

public void setPropertyValue(Object component, int property, Object value)
throws HibernateException {
UserPositionId id = (UserPositionId) component;
if (property == 0) {
id.setUserId((String) value);
} else {
id.setPosId((String) value);
}

}

public int hashCode(Object x) throws HibernateException {
return x.hashCode();
}

public boolean isMutable() {
return true;
}

public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)
throws HibernateException, SQLException {
String userId = (String) Hibernate.STRING.nullSafeGet(rs, names[0]);
String posId = (String) Hibernate.STRING.nullSafeGet(rs, names[1]);
return new UserPositionId(userId,posId);
}

public void nullSafeSet(PreparedStatement st, Object value, int index,
SessionImplementor session) throws HibernateException, SQLException {
UserPositionId id = (UserPositionId) value;
String userId = (id == null) ? null : id.getUserId();
String posId = (id == null) ? null :id.getPosId();
Hibernate.STRING.nullSafeSet(st,userId, index);
Hibernate.STRING.nullSafeSet(st,posId, index+1);
}

public Object replace(Object original, Object target, SessionImplementor session, Object owner)
throws HibernateException {
return deepCopy(original); //TODO: improve
}

public Class returnedClass() {
return UserPositionId.class;
}
}

Java代码



/**

* $Revision: 1.0 $

* Created: 2008-1-10

* $Date: 2008-1-10 $

*

* Author: Keven Chen

*/

package com.comwave.ww_oa.webui.org;

import java.util.ArrayList;

import java.util.List;

/**

* @author Keven Chen

* @version $Revision 1.0 $

*

*/

public class UserPosition {

private UserPositionId id = new UserPositionId();

private User user;

private Position postion;

private UserPosition director;

private boolean dept_director;

private boolean unit_director;

private boolean top_unit_director;

private List underling = new ArrayList();

public List getUnderling() {

return underling;

}

public void setUnderling(List underling) {

this.underling = underling;

}

public boolean isDept_director() {

return dept_director;

}

public void setDept_director(boolean dept_director) {

this.dept_director = dept_director;

}

public Position getPostion() {

return postion;

}

public void setPostion(Position postion) {

this.postion = postion;

}

public boolean isTop_unit_director() {

return top_unit_director;

}

public void setTop_unit_director(boolean top_unit_director) {

this.top_unit_director = top_unit_director;

}

public boolean isUnit_director() {

return unit_director;

}

public void setUnit_director(boolean unit_director) {

this.unit_director = unit_director;

}

public User getUser() {

return user;

}

public void setUser(User user) {

this.user = user;

}

public UserPosition getDirector() {

return director;

}

public void setDirector(UserPosition director) {

this.director = director;

}

public UserPositionId getId() {

return id;

}

public void setId(UserPositionId id) {

this.id = id;

}

public int hashCode() {

final int PRIME = 31;

int result = 1;

result = PRIME * result + ((id == null) ? 0 : id.hashCode());

return result;

}

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

final UserPosition other = (UserPosition) obj;

if (id == null) {

if (other.id != null)

return false;

} else if (!id.equals(other.id))

return false;

return true;

}

}

/**
* $Revision: 1.0 $
* Created: 2008-1-10
* $Date: 2008-1-10 $
*
* Author: Keven Chen
*/
package com.comwave.ww_oa.webui.org;

import java.util.ArrayList;
import java.util.List;

/**
* @author Keven Chen
* @version $Revision 1.0 $
*
*/
public class UserPosition {

private UserPositionId id = new UserPositionId();

private User user;

private Position postion;

private UserPosition director;

private boolean dept_director;

private boolean unit_director;

private boolean top_unit_director;

private List underling = new ArrayList();

public List getUnderling() {
return underling;
}

public void setUnderling(List underling) {
this.underling = underling;
}

public boolean isDept_director() {
return dept_director;
}

public void setDept_director(boolean dept_director) {
this.dept_director = dept_director;
}

public Position getPostion() {
return postion;
}

public void setPostion(Position postion) {
this.postion = postion;
}

public boolean isTop_unit_director() {
return top_unit_director;
}

public void setTop_unit_director(boolean top_unit_director) {
this.top_unit_director = top_unit_director;
}

public boolean isUnit_director() {
return unit_director;
}

public void setUnit_director(boolean unit_director) {
this.unit_director = unit_director;
}

public User getUser() {
return user;
}

public void setUser(User user) {
this.user = user;
}

public UserPosition getDirector() {
return director;
}

public void setDirector(UserPosition director) {
this.director = director;
}

public UserPositionId getId() {
return id;
}

public void setId(UserPositionId id) {
this.id = id;
}

public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + ((id == null) ? 0 : id.hashCode());
return result;
}

public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final UserPosition other = (UserPosition) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}

}

Xml代码



<?xml version="1.0" encoding='UTF-8'?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.comwave.ww_oa.webui.org">

<class name="UserPosition" table="user_positions">

<id name="id" type="com.comwave.ww_oa.webui.org.UserPositionIdUserType" unsaved-value="any">

<column name="userId"/>

<column name="posId"/>

</id>

<property name="dept_director" type="boolean"/>

<property name="unit_director" type="boolean"/>

<property name="top_unit_director" type="boolean"/>

<bag name="underling" inverse="true">

<key>

<column name="director_user_id"/>

<column name="director_pos_id"/>

</key>

<one-to-many class="UserPosition"/>

</bag>

<many-to-one name="director">

<column name="director_user_id"/>

<column name="director_pos_id"/>

</many-to-one>

</class>

</hibernate-mapping>

<?xml version="1.0"  encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.comwave.ww_oa.webui.org">
<class name="UserPosition" table="user_positions">
<id name="id" type="com.comwave.ww_oa.webui.org.UserPositionIdUserType" unsaved-value="any">
<column name="userId"/>
<column name="posId"/>
</id>
<property name="dept_director" type="boolean"/>
<property name="unit_director" type="boolean"/>
<property name="top_unit_director" type="boolean"/>
<bag name="underling" inverse="true">
<key>
<column name="director_user_id"/>
<column name="director_pos_id"/>
</key>
<one-to-many class="UserPosition"/>
</bag>
<many-to-one name="director">
<column name="director_user_id"/>
<column name="director_pos_id"/>
</many-to-one>
</class>
</hibernate-mapping>

使用:和正常的类相同的使用方式

Java代码



public UserPosition getPosition(String userId,String posId) {

return getPosition(new UserPositionId(userId,posId));

}

public UserPosition getPosition(UserPositionId id){

return (UserPosition) getHibernateTemplate().get(UserPosition.class,id);

}