play framework 2.4 ebean [PersistenceException: Property [] not found on models.SearchContent]答案

【问题标题】：play framework 2.4 ebean [PersistenceException: Property [] not found on models.SearchContent]play framework 2.4 ebean [PersistenceException: Property [] not found on models.SearchContent]
【发布时间】：2016-01-29 18:25:28
【问题描述】：

嗨，男孩，嗨，女孩，我有一个问题。我有一个代码：

public static List createPosts(PagedList searchContents){

    List<Post> posts = new ArrayList<Post>();
    List<SearchContent> searchContentsList = new ArrayList<SearchContent>();
    searchContentsList = searchContents.getList();

分页列表生成器：

PagedList<SearchContent> list = Ebean.find(SearchContent.class)
                .setRawSql(rawSql)
                .findPagedList(pageNumber, resultsToPage);

我有个例外：

[PersistenceException: Property [] not found on models.SearchContent]

在这一行：

    searchContentsList = searchContents.getList();

为什么会出错？

【问题讨论】：

标签： java playframework ebean

【解决方案1】：

这是因为 Ebean 对 select 子句属性执行了一些逻辑来获取对象的属性名称。它通过删除下划线将其转换为 camelCase。例如。如果我们有“select myid from ...”，那么它将搜索名称为“myid”的属性，但在您的 Model 类中，您可能已将成员变量名称写为“myId”。

如果您的查询类似于“select my_id from ..”如果您的成员变量名称是 myid，它将正常工作。

【讨论】：

【解决方案2】：

我有一个解决方案：您在原始查询和模型中的属性名称应与数据库表相同。

示例代码：-

<code>

RawSql rawSql = RawSqlBuilder
                .parse("SELECT  distinct CASE WHEN PARENT_EQUIPMENT_NUMBER IS NULL THEN EQUIPMENT_NUMBER ELSE  PARENT_EQUIPMENT_NUMBER END AS PARENT_EQUIPMENT_NUMBER " +
                        "FROM TOOLS_DETAILS").create();

    Query<ToolsDetail> query = Ebean.find(ToolsDetail.class);

    ExpressionList<ToolsDetail> expressionList = query.setRawSql(rawSql).where();//ToolsDetail.find.where();

    if (StringUtils.isNotBlank(sortBy)) {
        if (StringUtils.isNotBlank(sortMode) && sortMode.equals("descending")) {
            expressionList.setOrderBy("LPAD("+sortBy+", 20) "+"desc");

            //expressionList.orderBy().asc(sortBy);
        }else if (StringUtils.isNotBlank(sortMode) && sortMode.equals("ascending")) {

            expressionList.setOrderBy("LPAD("+sortBy+", 20) "+"asc");
           // expressionList.orderBy().asc(sortBy);
        } else {
            expressionList.setOrderBy("LPAD("+sortBy+", 20) "+"desc");

        }


    }
    if (StringUtils.isNotBlank(fullTextSearch)) {
        fullTextSearch = fullTextSearch.replaceAll("\\*","%");
        expressionList.disjunction()
                .ilike("customerSerialNumber", fullTextSearch)
                .ilike("organizationalReference", fullTextSearch)
                .ilike("costCentre", fullTextSearch)
                .ilike("inventoryKey", fullTextSearch)
                .ilike("toolType", fullTextSearch);
    }

    //add filters for date range
    String fromContractStartdate = Controller.request().getQueryString("fm_contract_start_date_from");
    String toContractStartdate = Controller.request().getQueryString("fm_contract_start_date_to");
    String fromContractEndtdate = Controller.request().getQueryString("fm_contract_end_date_from");
    String toContractEnddate = Controller.request().getQueryString("fm_contract_end_date_to");

    if(StringUtils.isNotBlank(fromContractStartdate) && StringUtils.isNotBlank(toContractStartdate))
    {

        Date fromSqlStartDate=new Date(AppUtils.convertStringToDate(fromContractStartdate).getTime());
        Date toSqlStartDate=new Date(AppUtils.convertStringToDate(toContractStartdate).getTime());
        expressionList.between("fmContractStartDate",fromSqlStartDate,toSqlStartDate);
    }if(StringUtils.isNotBlank(fromContractEndtdate) && StringUtils.isNotBlank(toContractEnddate))
    {
        Date fromSqlEndDate=new Date(AppUtils.convertStringToDate(fromContractEndtdate).getTime());
        Date toSqlEndDate=new Date(AppUtils.convertStringToDate(toContractEnddate).getTime());
        expressionList.between("fmContractEndDate",fromSqlEndDate,toSqlEndDate);
    }

    PagedList pagedList = ToolsQueryFilter.getFilter().applyFilters(expressionList).findPagedList(pageNo-1, pageSize);

    ToolsListCount toolsListCount = new ToolsListCount();
    toolsListCount.setList(pagedList.getList());
    toolsListCount.setCount(pagedList.getTotalRowCount());
    return toolsListCount;

【讨论】：