Question

我在GAE上部署时遇到错误，但我的应用程序在本地服务器上工作正常。

com.google.appengine.api.datastore.DatastoreNeedIndexException: no matching index found.
The suggested index for this query is:
    <datastore-index kind="Order" ancestor="false" source="manual">
        <property name="employee" direction="asc"/>
        <property name="__key__" direction="asc"/>
        <property name="route" direction="asc"/>
    </datastore-index>

即使我要求的索引在GAE中服务

__key__ ?                                           Serving     6202    1 MByte
__key__ ? , route ?                                 Serving     6202    1 MByte
__key__ ? , route ? , __key__ ?                     Serving     6202    2 MBytes
customerName ? , __key__ ?                          Serving     6202    1 MByte
customerName ? , employee ? , oDate ? , __key__ ?   Serving     6202    2 MBytes
customerName ? , oDate ? , __key__ ?                Serving     6202    1 MByte
employee ? , __key__ ? , route ?                    Serving     6202    1 MByte
employee ? , __key__ ?                              Serving     6202    1 MByte
employee ? , oDate ? , __key__ ?                    Serving     6202    1 MByte
oDate ? , __key__ ?                                 Serving     6202    1 MByte
route ? , __key__ ?                                 Serving     6202    1 MByte

并且还根据错误建议

更新了datastore-indexes.xml的内容

<?xml version="1.0" encoding="utf-8"?>
<datastore-indexes autoGenerate="true">
    <!-- Used 7 times in query history -->
    <datastore-index kind="Order" ancestor="false" source="manual">
        <property name="employee" direction="asc"/>
        <property name="__key__" direction="asc"/>
        <property name="route" direction="asc"/>
    </datastore-index>

    <!-- Used 16 times in query history -->
    <datastore-index kind="LineItem" ancestor="false" source="manual">
        <property name="itemName" direction="asc" />
        <property name="orderID" direction="asc" />
        <property name="quantity" direction="asc" />
    </datastore-index>
</datastore-indexes>

这是我试图运行的查询。

Filter employeeFilter = new FilterPredicate("employee",FilterOperator.EQUAL, saleRepID);
Filter startTimeFilter = new FilterPredicate(Entity.KEY_RESERVED_PROPERTY,FilterOperator.GREATER_THAN_OR_EQUAL, startOrderKey);
Filter endTimeFilter = new FilterPredicate(Entity.KEY_RESERVED_PROPERTY,FilterOperator.LESS_THAN_OR_EQUAL, endOrderKey);

logger.warning("Creating a Final filter to find a uniquely visited routes by that employee in that particular time range");
Filter finalFilterForRoutes = CompositeFilterOperator.and(endTimeFilter, CompositeFilterOperator.and(employeeFilter,startTimeFilter));

logger.warning("Finding a uniquely visited routes by that employee on that particular day");
    QueryResultList<Entity> allRoutesVisited = datastore.prepare(new Query("Order").addProjection(
                                    new PropertyProjection("route",String.class)).setDistinct(true)
                                    .setFilter(finalFilterForRoutes))
                                    .asQueryResultList(FetchOptions.Builder.withDefaults());

Answer 1

不幸的是，你遇到了验证码中的错误（已经修复了，应该在1.8.5或1.8.6中）。实际上不支持该查询，因为它要求'__key__'和'route'都是索引排序顺序中的第一个值（这是不可能的）。如果要执行此查询，则必须在内存中收集“route”的不同值。

即使在提供索引之后，GAE中的DatastoreNeedIndexException也是如此

1 个答案: