composite－id使用
composite－id
第一要对model进行如下改造：
将staffskillId，staffId 封装成composite-id 形成class SkillTableKey
如下所示：
package com.sunnyever.model;
public class SkillTableKey extends com.sunnyever.model.BaseObject implements java.io.Serializable {
private long staffskillId;
private long staffId;
public SkillTableKey() {
}
/**
* @hibernate.property name="staffId" type="java.long.long" column="STAFF_ID"
*/
public long getStaffId() {
return staffId;
}
public void setStaffId(long staffId) {
this.staffId = staffId;
}
/**
* @hibernate.property name="staffskillId" type="java.long.long" column="staffskill_id"
*/
public long getStaffskillId() {
return staffskillId;
}
public void setStaffskillId(long staffskillId) {
this.staffskillId = staffskillId;
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + (int) (staffId ^ (staffId >>> 32));
result = PRIME * result + (int) (staffskillId ^ (staffskillId >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final SkillTableKey other = (SkillTableKey) obj;
if (staffId != other.staffId)
return false;
if (staffskillId != other.staffskillId)
return false;
return true;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return null;
}
}
第二，将composite-id导入 class SkillTable中设为主键
/**
* @hibernate.id class="com.sunnyever.model.SkillTableKey"
*
*/
public SkillTableKey getKey() {
return key;
}
下面为class SkillTable：
**
* @struts.form include-all="true" extends="BaseForm"
* @hibernate.class
* table="SKILL_TABLE"
*
*/
public class SkillTable extends com.sunnyever.model.BaseObject implements java.io.Serializable {
// Fields
private SkillTableKey key;
private String skill;
private String level1;
// Constructors
/** default constructor */
public SkillTable() {
}
/** full constructor */
public SkillTable(SkillTableKey key, String skill, String level1) {
this.key=key;
this.skill = skill;
this.level1 = level1;
}
/**
* @hibernate.id class="com.sunnyever.model.SkillTableKey"
*
*/
public SkillTableKey getKey() {
return key;
}
public void setKey(SkillTableKey key) {
this.key = key;
}
/**
*
* @hibernate.property
* column="SKILL"
* type="java.lang.string"
*/
public String getSkill() {
return this.skill;
}
public void setSkill(String skill) {
this.skill = skill;
}
/**
*
* @hibernate.property
* column="LEVEL1"
* type="java.lang.string"
*/
public String getLevel1() {
return this.level1;
}
public void setLevel1(String level1) {
this.level1 = level1;
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + ((key == null) ? 0 : key.hashCode());
result = PRIME * result + ((level1 == null) ? 0 : level1.hashCode());
result = PRIME * result + ((skill == null) ? 0 : skill.hashCode());
return result;
}
第三 在dao增加public List findByIds( SkillTableKey key)
通过SkillTableKey 作为 papm获取
package com.sunnyever.dao;
import java.util.List;
import com.sunnyever.dao.Dao;
import com.sunnyever.model.SkillTable;
import com.sunnyever.model.SkillTableKey;
public interface SkillTableDao extends Dao {
/**
* Retrieves all of the skillTables
*/
public List getSkillTables(SkillTable skillTable);
/**
*find only staff's all skills
*
* SkillTableKey is a papm that is the skillTable's foregin key
* @return skillTable populated skillTable object
*/
public List findByIds( SkillTableKey key);
}
第四在class SkillTableDaoHibernate 中实现List findByIds( SkillTableKey key);
package com.sunnyever.dao.hibernate;
import java.util.List;
import com.sunnyever.dao.hibernate.BaseDaoHibernate;
import com.sunnyever.model.SkillTable;
import com.sunnyever.model.SkillTableKey;
import com.sunnyever.dao.SkillTableDao;
import org.hibernate.Query;
import org.springframework.orm.ObjectRetrievalFailureException;
public class SkillTableDaoHibernate extends BaseDaoHibernate implements SkillTableDao {
/**
* @see com.sunnyever.dao.SkillTableDao#getSkillTables(com.sunnyever.model.SkillTable)
*/
public List getSkillTables(final SkillTable skillTable) {
return getHibernateTemplate().find("from SkillTable");
/* Remove the line above and uncomment this code block if you want
to use Hibernate's Query by Example API.
if (skillTable == null) {
return getHibernateTemplate().find("from SkillTable");
} else {
// filter on properties set in the skillTable
HibernateCallback callback = new HibernateCallback() {
public Object doInHibernate(Session session) throws HibernateException {
Example ex = Example.create(skillTable).ignoreCase().enableLike(MatchMode.ANYWHERE);
return session.createCriteria(SkillTable.class).add(ex).list();
}
};
return (List) getHibernateTemplate().execute(callback);
}*/
}
/**
* @see com.sunnyever.dao.SkillTableDao#getSkillTable(long staffskillId)
*/
public List findByIds( SkillTableKey key) {
log.debug("getting SkillTable instance with id: " + key);
try {
String hql="from SkillTable m where m.id.staffId=:staffId ";
Query query= getSession().createQuery(hql);
query.setProperties(key);
return query.list();
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
}
}