工作笔记—hibernate之QueryCriteria

转自：https://www.cnblogs.com/jack4738/p/9178394.html

本人用的是sg-uap虚拟环境

//查询方法
//参数 RequestCondition 配合 controller 的 @QueryRequestParam注解可以将前台传入整个对象进行接收
//参数 UserSession 当前登录的用户信息 
//obj 实体类
    public QueryResultObject query(RequestCondition queryCondition,UserSession userSession){
        
        QueryCriteria qc = new QueryCriteria;
        //查询集合
        List<obj> result = null;
        //查询记录总数
        int count = 0;
        //查询条件
        qc.addWhere("","数据库字段名","=","值");
        //查询表
        qc.addFrom(obj.class)
        //其他的判断条件
        if(queryCondition != null){
            //添加其他查询条件
            qc = wrapQuery(queryCondition,qc);
            //获取总记录数
            count = getRecordCount(qc);
            //添加分页信息
            qc = wrapPage(queryCondition,qc);
            result = hibernateDao.findAllByCriteria(qc);
        }else{
            result = hibernateDao.findAllByCriteria(qc);
            count = getRecordCount(qc);
        }
        return 封装对象返回
    }
    public QueryCriteria wrapQuery(QueryCriteria qc,RequestCondition queryCondition ){

        List<QueryFilter> wheres = queryCondition.getQueryFilter(obj.class);
        if(wheres != null && wheres.size() > 0){
            //模糊查询
            for(int i = 0;i<wheres.size();i++){
                QueryFilter q = wheres.get(i);
                if("对象属性".equals(q.getFieldName)){
                    //设置此属性的模糊查询
                    q.setOperator("^");
                }
                //排序
                qc.addOrder("排序字段","排序规则");
                //构造查询where语句
                CrudUtils.addQCWhere(qc,Wheres,Obj.class.getName());
            }
            String orders = queryCondition.getSorter();
            //替换分隔符构建排序语句
            if(orders != null){
                qc.addOrder(Order.replaceAll("&",","))
            }
                return qc;
    }

    public QueryCriteria wrapPage(QueryCriteria qc,RequestCondition queryCondition ){
        int pageIndex = 1,pageSize = 1;
        if(queryCondition.getPageIndex() != null&&queryCondition.getPageSize() != null){
            pageIndex=queryCondition.getPageIndex();
            pageSize=queryCondition.getPageSize();
            qc.addPage(pageIndex,pageSize);
        }
        return qc;
    }

一个简单的模糊+分页查询