筛选功能
public List findPersonList(int start, int end, Person person) throws HibernateException, SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException { StringBuffer sql = new StringBuffer(); //sql.append("from Person as p where 1=1 "); //考虑到oracle不支持这种查询方式,所以不要as提高系统的兼容性 sql.append("from Person p where 1=1 "); Map map = new HashMap(); if(!StringUtils.isEmpty(person.getName())){ sql.append(" and p.name like :name "); map.put("name", new ParamObject(person,"getName")); } if(!StringUtils.isEmpty(person.getPassword())){ sql.append(" and p.password like :password"); map.put("password", new ParamObject(person,"getPassword")); } Set params = map.keySet(); Iterator it = params.iterator(); Query q = this.getSession().createQuery(sql.toString()); while(it.hasNext()){ String key = (String)it.next(); ParamObject obj = (ParamObject)map.get(key); if(obj.execute() instanceof String){ q.setParameter(key, obj.execute()); } } //hibernate的分页功能 q.setMaxResults(end); q.setFirstResult(start); return q.list(); }
备注:使用HQL查询,查询条件应该是“对象属性”,而不是“表的列名”
package hb.util; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class ParamObject { private Object instance; private String method; public ParamObject(Object instance,String method){ this.instance = instance; this.method = method; } public Object execute() throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException{ Class cls = instance.getClass(); Method md = cls.getMethod(this.method, null); return md.invoke(instance, null); } }