单个领域hibernate动态参数查询

使用此动态查询方法，不用每次都为一个带参的hibernate查询写一个查询，只需要用map传递参数即可，传递的参数map.key名必须与领域模型的属性名一致,如果不一致，则不会应用查询参数；多表连接查询等复杂推荐使用ibatis，但是使用hibernate最好设置为对象间关联，就可以在hibernate内事务内解决问题，不然事物配置很麻烦；

第一个为获取类的属性名的静态工具方法

第二个为动态查询方法，可写在抽象基类

余下为调用的示例方法

此代码写的粗糙，有不足及纰漏，望大家及时更贴斧正

package ly.tool.utils.ref;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;

import org.apache.log4j.Logger;

import com.jhzp.domain.Userinfo;
import com.jhzp.domain.base.BaseDomain;


public class ReflectUtils {

	private static Logger log=Logger.getLogger(ReflectUtils.class);
	
	public static void main(String[] args) throws IntrospectionException{
		System.out.println(listPropNames( Userinfo.class));;
	}
	/**
	 * 获取领域属性名列表
	 */
	public static List<String> listPropNames(Class clazz) {
		List<String> pnamel=new ArrayList<String>();
		BeanInfo bi;
		try {
			bi = Introspector.getBeanInfo(clazz);
			PropertyDescriptor[] pds = bi.getPropertyDescriptors();
	        for (int i = 0; i < pds.length; i++) {
	            String propName = pds[i].getName();
	            pnamel.add(propName);
	        }
	        return pnamel;
		} catch (IntrospectionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
		
	}
	
}

/**
	 * hibernate 动态参数查询 ，查询参数形式只能是： name=:name,
	 * 其他形式的查询使用自定义hql的查询queryByParamAndHql
	 */
protected List queryByParam(org.hibernate.Session session,Class dclazz,Map<String,Object> params){
		List<String> fnamel=ReflectUtils.listPropNames(dclazz);
		Set<String> pnames=params.keySet();
		List<String> pnamel=new ArrayList<String>();
		Iterator<String> iter=pnames.iterator();
		while(iter.hasNext()){
			String pname=iter.next();
			if(null!=params.get(pname) && fnamel.contains(pname)){
				pnamel.add(pname);
			}
		}
		String hql="from "+dclazz.getSimpleName();
		if(pnamel.size()>0){
			hql=hql+" where ";
		}
		StringBuilder sdb=new StringBuilder();
		sdb.append(hql);
		int count=0;
		for(String pname:pnamel){
			if(!fnamel.contains(pname)){
				log.info(" pname: "+pname+"参数跟属性名不同，返回了，fnamel列表： "+fnamel);
				return null;
			}
			
			if(count>0){
				sdb.append(" and "+ pname+" = :"+pname);
			}else
				sdb.append(pname+" = :"+pname);
			count++;
		}
		hql=sdb.toString();
		log.info("打印生成的hql： "+hql);
		Query query=session.createQuery(hql);
		for(String pname:pnamel){
			Object obj=params.get(pname);
			if(obj instanceof String){
				query.setParameter(pname, obj);
			}else if(obj instanceof BigDecimal){
				query.setBigDecimal(pname, ((BigDecimal)obj));
			}else if(obj instanceof BigInteger){
				query.setBigInteger(pname, ((BigInteger)obj));
			}else if(obj instanceof Boolean){
				query.setBoolean (pname, ((Boolean)obj));
			}else if(obj instanceof Byte){
				query.setByte(pname, ((Byte)obj));
			}else if(obj instanceof Calendar){
				query.setCalendar(pname, ((Calendar)obj));
			}else if(obj instanceof Date){
				log.info("应用到了"+Date.class);
				query.setDate(pname, ((Date)obj));
			}else if(obj instanceof Double){
				query.setDouble(pname, ((Double)obj));
			}else if(obj instanceof Integer){
				query.setDouble(pname, ((Integer)obj));
			}else if(obj instanceof Locale){
				query.setLocale(pname, ((Locale)obj));
			}else if(obj instanceof Long){
				query.setLong(pname, ((Long)obj));
			}else{
				query.setParameter(pname, obj);
			}
			
		}

/**
	 * 自定义hql，传递动态的参数
	 */
	protected List queryByParamAndHql(Session session,String hql,Map<String,Object> params){
		Query query=session.createQuery(hql);
		for(String pname:params.keySet()){
			if(hql.contains(pname)){
				Object obj=params.get(pname);
				if(obj instanceof String){
					query.setParameter(pname, obj);
				}else if(obj instanceof BigDecimal){
					query.setBigDecimal(pname, ((BigDecimal)obj));
				}else if(obj instanceof BigInteger){
					query.setBigInteger(pname, ((BigInteger)obj));
				}else if(obj instanceof Boolean){
					query.setBoolean (pname, ((Boolean)obj));
				}else if(obj instanceof Byte){
					query.setByte(pname, ((Byte)obj));
				}else if(obj instanceof Calendar){
					query.setCalendar(pname, ((Calendar)obj));
				}else if(obj instanceof Date){
					log.info("应用到了"+Date.class);
					query.setDate(pname, ((Date)obj));
				}else if(obj instanceof Double){
					query.setDouble(pname, ((Double)obj));
				}else if(obj instanceof Integer){
					query.setDouble(pname, ((Integer)obj));
				}else if(obj instanceof Locale){
					query.setLocale(pname, ((Locale)obj));
				}else if(obj instanceof Long){
					query.setLong(pname, ((Long)obj));
				}else{
					query.setParameter(pname, obj);
				}
			}
		}
		
		try {
			return query.list();
		} catch (Exception e) {
			e.printStackTrace();
			log.error("第二查询出错了。");
			return null;
		}
	}

/**
 * 被service调用代码片段：
 * /
@Transactional(readOnly=true)
	public List<Statistics> listStatistics(Map<String,Object> params) throws SQLException{
		return super.queryByParam(super.getHibernateSession(), Statistics.class, params);
	}

@Transactional(readOnly=true)
	public List<Statistics> listStatistics2(Date date) throws SQLException{
		String hql="from Statistics where atday =:atday";
		Query query=super.getHibernateSession().createQuery(hql);
		query.setDate("atday", date);
		return query.list();
	}

/**
 * 被control调用代码片段
 */
@RequestMapping(value="/tss/stc/listsaleno.html", method=RequestMethod.GET)
	public String listsaleno(HttpServletRequest hreq,ModelMap mm) throws SQLException{
		Map<String,Object> params=new HashMap<String,Object>();
		params.put("stype", "no");
		params.put("atday", new Date());
		List<Statistics> stcl= this.sts.listStatistics(params);
		mm.addAttribute("stcl", stcl);
		mm.addAttribute("stype", "no");
		return "tss/stc/stcs";
	}
/**
 * client 调用
 */
public static void main(String[] args) throws Exception {
	Calendar calendar = Calendar.getInstance();
	StatisticsTask task = (StatisticsTask) act.getBean("statisticsTask");
	StatisticsService sts=(StatisticsService) act.getBean("statisticsService");
	Map<String,Object> params=new HashMap<String,Object>();
	params.put("stype", "uc");
	params.put("atday", calendar.getTime());

	String hql="from Statistics where atday <:atday and stype=:stype";
	List<Statistics> stcl=sts.hlistStatisticsByHql(hql, params);
	log.info("统计的长度："+stcl.size());
}