* @param userAlias 用户表别名，传递空，忽略此参数
* @return ql查询字符串
*/
protected static String dataScopeFilterString(User user, String officeAlias, String userAlias) {
Junction junction = dataScopeFilter(user, officeAlias, userAlias);
Iterator<Criterion> it = junction.conditions().iterator();
StringBuilder ql = new StringBuilder();
ql.append(" and (");
if (it.hasNext()){
ql.append(it.next());
}