oa_05

从现有的分页处理方案中，抽象出AbstractManager，以便将分页逻辑进行封装处理，
使得分页处理更加简单（不需要拷贝分页逻辑）
- 重点理解抽象的概念（如何抽象？抽象哪些内容？）

package com.bjsxt.oa.manager.impl;

import java.util.List;

import org.hibernate.Query;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.bjsxt.oa.PagerModel;
import com.bjsxt.oa.manager.SystemException;

public abstract class AbstractManager extends HibernateDaoSupport {
	
	public PagerModel searchPaginated(String hql,int offset,int pagesize){
		return searchPaginated(hql, null, offset, pagesize);
	}
	
	public PagerModel searchPaginated(String hql,Object value,int offset,int pagesize){
		return searchPaginated(hql, new Object[]{value}, offset, pagesize);
	}
	
	public PagerModel searchPaginated(String hql,Object[] values,int offset,int pagesize){
		//获得总记录数
		String countHql = getCountQuery(hql);
		Query query = getSession().createQuery(countHql);
		if(values != null && values.length > 0){
			for(int i=0; i<values.length; i++){
				query.setParameter(i, values[i]);
			}
		}
		int total = ((Long)query.uniqueResult()).intValue();
		
		//获得当前页的数据
		query = getSession().createQuery(hql);
		if(values != null && values.length > 0){
			for(int i=0; i<values.length; i++){
				query.setParameter(i, values[i]);
			}
		}
		query.setFirstResult(offset);
		query.setMaxResults(pagesize);
		List datas = query.list();
		
		PagerModel pm = new PagerModel();
		pm.setDatas(datas);
		pm.setTotal(total);
		
		return pm;
	}
	
	/**
	 * 根据HQL语句，获得查询总记录数的HQL语句
	 * 如：
	 * select o from Organization o where o.parent is null
	 * 经过转换，得到
	 * select count(*) from Organization o where o.parent is null
	 * @param hql
	 * @return
	 */
	private String getCountQuery(String hql){
		int index = hql.indexOf("from");
		if(index != -1){
			return "select count(*) " + hql.substring(index);
		}
		throw new SystemException("无效的HQL查询语句【"+hql+"】");
	}
}

package com.bjsxt.oa.manager.impl;

import java.util.List;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.bjsxt.oa.PagerModel;
import com.bjsxt.oa.manager.OrgManager;
import com.bjsxt.oa.manager.SystemException;
import com.bjsxt.oa.model.Organization;

public class OrgManagerImpl extends AbstractManager implements OrgManager {
	
	public void addOrg(Organization org, int parentId) {
		if(parentId != 0){
			org.setParent(findOrg(parentId));
		}
		getHibernateTemplate().save(org);
		
		//自动生成机构编号
		org.setSn(
			(org.getParent() == null ? "" : org.getParent().getSn() + "_")
			+ org.getId()
		);
		
		getHibernateTemplate().update(org);
	}

	public void delOrg(int orgId) {
		Organization org = findOrg(orgId);
		
		//判断子机构列表是否为空
		if(org.getChildren().size() > 0){
			//throw new RuntimeException("存在子机构信息，不允许删除");
//			SystemException se = new SystemException("");
//			se.setKey();
//			se.setValues(..);
			throw new SystemException("errors.org.hassuborg",new Object[]{org.getName(),org.getChildren().size()},"存在子机构信息，不允许删除");
		}
		
		//判断人员是否非空
		String hql = "select count(*) from Person p where p.org.id = ?";
		Long personSize = (Long)getSession().createQuery(hql).setParameter(0, orgId).uniqueResult();
		if(personSize > 0){
			throw new RuntimeException("机构下面有人员信息，不允许删除");
		}
		
		getHibernateTemplate().delete(org);
	}

	public Organization findOrg(int orgId) {
		return (Organization)getHibernateTemplate().load(Organization.class, orgId);
	}

	public PagerModel searchOrgs(int parentId,int offset,int pagesize) {
		
		String hql = "select o from Organization o where o.parent is null";
		if(parentId != 0){
			hql = "select o from Organization o where o.parent.id = "+parentId;
		}

		return searchPaginated(hql,offset, pagesize);
	}

	public void updateOrg(Organization org, int parentId) {
		if(parentId != 0){
			org.setParent(findOrg(parentId));
		}
		getHibernateTemplate().update(org);
		
	}

}