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中投射時出錯
這是在JSF + JPA Web應用程序上。在JPQL
當我使用以下包含投射的JPQL查詢時，它會給出一個難以理解的錯誤。
這是查詢
jpql = "select new data.dataStructure.PharmacyStockRow(amp.vmp.name, sum(s.stock), "
+ "sum(s.itemBatch.purcahseRate * s.stock), sum(s.itemBatch.retailsaleRate * s.stock))"
+ "from Stock s join treat(s.itemBatch.item as Amp)amp "
+ "where s.stock>:z and s.department=:d "
+ "group by amp.vmp ";
m.put("d", department);
m.put("z", 0.0);
這是創建只是接收來自查詢結果的類。
package data.dataStructure;
public class PharmacyStockRow {
String code;
String name;
Double qty;
Double purchaseValue;
Double saleValue;
public PharmacyStockRow() {
}
public PharmacyStockRow(String name, Double qty, Double purchaseValue, Double saleValue) {
this.name = name;
this.qty = qty;
this.purchaseValue = purchaseValue;
this.saleValue = saleValue;
}
我有一個存儲有關股票的數據的股票類。它有一個代表批次的ItemBatch類。批次有一個項目。該項目實際上是一個Amp，它擴展了Item。 Amp有一個Vmp。我想通過Vmp獲得股票。如果ItemBatch的屬性爲Amp，那將會非常容易，但我必須使用更多的通用Item作爲參考。所以我需要在Java Resistance Query中將Item投射到Amp。我嘗試過，但它給出了以下錯誤。
我使用EclipseLink 2.5作爲Persistance Provider。
Caused by: Exception [EclipseLink-6034] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.QueryException
Exception Description: Invalid query item expression [
Query Key vmp
Query Key item (entity.pharmacy.Amp)
Query Key itemBatch
Base entity.pharmacy.Stock].
Query: ReportQuery(referenceClass=Stock jpql="select new data.dataStructure.PharmacyStockRow(amp.vmp.name, sum(s.stock), sum(s.itemBatch.purcahseRate * s.stock), sum(s.itemBatch.retailsaleRate * s.stock)) from Stock s join treat(s.itemBatch.item as Amp)amp where s.stock>:z and s.department=:d group by amp ")
at org.eclipse.persistence.exceptions.QueryException.invalidExpressionForQueryItem(QueryException.java:622)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.getLeafDescriptorFor(ObjectLevelReadQuery.java:1460)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.getLeafMappingFor(ObjectLevelReadQuery.java:1408)
at org.eclipse.persistence.internal.queries.ReportItem.initialize(ReportItem.java:124)
at org.eclipse.persistence.queries.ConstructorReportItem.initialize(ConstructorReportItem.java:137)
at org.eclipse.persistence.queries.ReportQuery.prepare(ReportQuery.java:1044)
at org.eclipse.persistence.queries.DatabaseQuery.checkPrepare(DatabaseQuery.java:613)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.checkPrepare(ObjectLevelReadQuery.java:823)
at org.eclipse.persistence.queries.DatabaseQuery.prepareCall(DatabaseQuery.java:1741)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:268)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:190)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:142)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:126)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1475)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1497)
我不確定'sum（...）'內部的乘法是否有效JPQL – DannyMo
我以前做過。我已經單獨更改了所有內容，並發現當鑄造變量處於group by子句時出現錯誤。 –