Eclipselink mongoDB本地查詢find（）不起作用

我最近正在使用mongoDB數據庫處理JAVA項目。因此，我決定使用eclipselink 2.4。關於查詢，它允許通常的「SQL like」查詢，但是（據說）允許本地mongoDB查詢。我跟着this tutorial，並把所有的工作。我能夠運行findOne（）原生的MongoDB查詢（queryOne），但我不能夠運行找到（）查詢（queryAll什麼也不做）......Eclipselink mongoDB本地查詢find（）不起作用

查詢queryOne = em.createNativeQuery（」 db.ORDER.findOne（）「， Order.class）;查詢queryAll = em.createNativeQuery（「db.ORDER.find（）」， Order.class）;

Exception in thread "main" Local Exception Stack: 
Exception [EclipseLink-6044] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.QueryException 
Exception Description: The primary key read from the row [EISMappedRecord(
    value => DBQuery: myTest.ORDER -> undefined)] during the execution of the query was detected to be null. Primary keys must not contain null. 
Query: ReadAllQuery(referenceClass=Order) 
    at org.eclipse.persistence.exceptions.QueryException.nullPrimaryKeyInBuildingObject(QueryException.java:912) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:586) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:562) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:776) 
    at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:781) 
    at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:433) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1149) 
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1108) 
    at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:392) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1196) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2875) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1602) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1584) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1549) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:231) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:411) 
    at example.Test.testQuery(Test.java:171) 
    at example.Test.main(Test.java:54)

查詢與訴諸MongoDB的外殼執行：

我執行查詢時出現錯誤

{ "_id" : "5061DC17E4B0881F592675A5", "TOTALCOST" : 3187, "SHIPPINGADDRESS" : [  { "POSTALCODE" : "L5J1H7", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "17 Jane St." } ], "ORDERLINES" : [ { "DESCRIPTION" : "machine", "COST" : 2999, "LINENUMBER" : 1 },  { "DESCRIPTION" : "shipping",  "COST" : 129, "LINENUMBER" : 2 },  { "DESCRIPTION" : "installation",  "COST" : 59, "LINENUMBER" : 3 } ], "VERSION" : NumberLong(1), "DESCRIPTION" : "Pinball machine", "CUSTOMER__id" : "5061DC17E4B0881F592675A4", "BILLINGADDRESS" : [ { "POSTALCODE" : "L5J1H7", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "17 Jane St." } ] } 
{ "_id" : "5061DC17E4B0881F592675A6", "TOTALCOST" : 565, "SHIPPINGADDRESS" : [ { "POSTALCODE" : "L5J1H7", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "17 Jane St." } ], "ORDERLINES" : [ { "DESCRIPTION" : "machine", "COST" : 500, "LINENUMBER" : 1 },  { "DESCRIPTION" : "balls", "COST" : 5,  "LINENUMBER" : 2 },  { "DESCRIPTION" : "shipping",  "COST" : 60, "LINENUMBER" : 3 } ], "VERSION" : NumberLong(1), "DESCRIPTION" : "Foosball", "CUSTOMER__id" : "5061DC17E4B0881F592675A4", "BILLINGADDRESS" : [ { "POSTALCODE" : "L5J1H8", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "7 Bank St." } ] } 
{ "_id" : "5061DC17E4B0881F592675A8", "TOTALCOST" : 402, "SHIPPINGADDRESS" : [ { "POSTALCODE" : "L5J1H7", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "17 Jane St." } ], "ORDERLINES" : [ { "DESCRIPTION" : "table", "COST" : 300, "LINENUMBER" : 1 },  { "DESCRIPTION" : "balls", "COST" : 5,  "LINENUMBER" : 2 },  { "DESCRIPTION" : "rackets", "COST" : 15, "LINENUMBER" : 3 },  { "DESCRIPTION" : "net", "COST" : 2,  "LINENUMBER" : 4 },  { "DESCRIPTION" : "shipping",  "COST" : 80, "LINENUMBER" : 5 } ], "VERSION" : NumberLong(1), "DESCRIPTION" : "Pingpong table", "CUSTOMER__id" : "5061DC17E4B0881F592675A7", "BILLINGADDRESS" : [ { "POSTALCODE" : "L5J1H8", "COUNTRY" : "Canada", "PROVINCE" : "ON", "CITY" : "Ottawa", "STREET" : "7 Bank St." } ] }

如果你能告訴我如何解決這個或一個小的解決方法，我將不勝感激。

編輯：JPQL查詢可以是有用的，我使用一些作爲解決方法，但是，我目前不能查詢引用ids。舉例來說，如果我有一個客戶參考訂單（訂單隻保存用戶的ID）與MongoDB的查詢，我會尋找像taht：

db.ORDER.find({"CUSTOMER__id": "ID"})

的JPQL類似的查詢，我相信這將是這樣的：

query = em.createQuery("Select o from Order o where o.customer.id = \"ID\"");

但是，再次...不工作！錯誤：

Exception in thread "main" Local Exception Stack: 
Exception [EclipseLink-6168] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.QueryException 
Exception Description: Query failed to prepare, unexpected error occurred: [java.lang.ClassCastException: org.eclipse.persistence.eis.mappings.EISOneToOneMapping cannot be cast to org.eclipse.persistence.mappings.OneToOneMapping]. 
Internal Exception: java.lang.ClassCastException: org.eclipse.persistence.eis.mappings.EISOneToOneMapping cannot be cast to org.eclipse.persistence.mappings.OneToOneMapping 
Query: ReadAllQuery(referenceClass=Order jpql="Select o from Order o where o.customer.id = "ID"") 
    at org.eclipse.persistence.exceptions.QueryException.prepareFailed(QueryException.java:1572) 
    at org.eclipse.persistence.queries.DatabaseQuery.checkPrepare(DatabaseQuery.java:633) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.checkPrepare(ObjectLevelReadQuery.java:882) 
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:838) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1108) 
    at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:392) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1196) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2875) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1602) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1584) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1549) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:231) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:411) 
    at example.Test.testQuery(Test.java:175) 
    at example.Test.main(Test.java:55) 
Caused by: java.lang.ClassCastException: org.eclipse.persistence.eis.mappings.EISOneToOneMapping cannot be cast to org.eclipse.persistence.mappings.OneToOneMapping 
    at org.eclipse.persistence.internal.expressions.RelationExpression.checkForeignKeyJoinOptimization(RelationExpression.java:512) 
    at org.eclipse.persistence.internal.expressions.RelationExpression.normalize(RelationExpression.java:535) 
    at org.eclipse.persistence.internal.expressions.SQLSelectStatement.normalize(SQLSelectStatement.java:1365) 
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.buildNormalSelectStatement(ExpressionQueryMechanism.java:543) 
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.prepareSelectAllRows(ExpressionQueryMechanism.java:1675) 
    at org.eclipse.persistence.queries.ReadAllQuery.prepareSelectAllRows(ReadAllQuery.java:719) 
    at org.eclipse.persistence.queries.ReadAllQuery.prepare(ReadAllQuery.java:656) 
    at org.eclipse.persistence.queries.DatabaseQuery.checkPrepare(DatabaseQuery.java:614) 
    ... 13 more

感謝

來源

2012-09-25 lage

您是否使用_List orders = queryAll.getResultList（）; _獲取結果？ – Anshu

是的，但它甚至沒有關係，甚至在我運行查詢之前，我得到了錯誤。我更新了問題以包含錯誤消息。 – lage

你可以對提示執行查詢並在此處發佈結果嗎？ – Anshu

看來它試圖獲取具有主鍵爲空的對象。此外，記錄是A5, A6 and A8.如果按順序創建A7，看起來像是亂七八糟的？

是否可以刪除ORDER文檔並再次運行測試（插入並獲取）？

來源

2012-09-25 16:48:10 Anshu

這些ID都可以，A7考慮到代碼中存在的順序，將成爲客戶。每次運行測試時，我都會刪除整個數據庫並從頭開始創建它... – lage

我看到..看起來不像您代碼中的錯誤。我們必須缺少一些東西 – Anshu

Yap ...恐怕find（）查詢可能不被支持，但是沒有任何文檔說明... 感謝您的幫助... – lage

我不認爲find（）與本地MongoDB API的findOne（）相同。

當您在沒有該類的情況下執行本機查詢時會發生什麼？

即查詢queryAll = em.createNativeQuery（「db.ORDER.find（）」）; queryAll.getResultList（）;

你回來了什麼？

我不認爲原生find（）是直接支持的（但您可以對大多數查詢使用JPQL）。請爲此記錄一個錯誤，應該有一些方法讓它工作。

來源

2012-09-26 13:23:11 James

嗨，謝謝響應。當我運行沒有類我得到一個classCast excpetion（org.eclipse.persistence.nosql.adapters.mongo.MongoPlatform不能轉換爲org.eclipse.persistence.platform.database.DatabasePlatform），所以我假設這種方法不是支持nosql。關於JPQL查詢，我更新了JPQL問題，如果你可以看看;）謝謝 – lage

請爲這兩個問題記錄一個錯誤。 – James

對於第二個問題，請嘗試使用o.customer =：customer並將實例作爲參數傳遞，也可以映射customerId或定義查詢鍵。 – James

Eclipselink mongoDB本地查詢find（）不起作用

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