Eclipselink mongoDB本机查询find（）不起作用

时间：2012-09-25 16:12:47

标签： java mongodb jpa eclipselink nativequery

我最近正在开发一个带有mongoDB数据库的JAVA项目。因此我决定使用eclipselink 2.4。关于查询，它允许通常的“SQL like”查询，但也（假设）允许本机mongoDB查询。我跟着this tutorial并把一切都搞定了。我能够运行findOne（）本机mongoDB查询（queryOne），但我无法运行find（）查询（queryAll不起作用）......

  1. 查询queryOne = em.createNativeQuery（“db.ORDER.findOne（）”， Order.class）;

  2. 查询queryAll = em.createNativeQuery（“db.ORDER.find（）”，     Order.class）;

    3. 执行查询时出错：

    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)

    使用MongoDB shell执行查询：

    { "_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." } ] }

    如果你能告诉我如何解决这个或一点办法，我会很感激。

    编辑：JPQL查询可能很有用，我使用一些作为解决方法，但是，我目前无法查询引用ID。例如，如果我有一个带有客户参考的订单（订单只保存客户的ID）和mongoDB查询，我会像taht一样搜索：

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

    我相信JPQL类似的查询会像：

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

    然而，再次......不工作!!错误：

    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

    由于

2 个答案:

答案 0 :(得分：0)

它似乎试图获取一个主键为null的对象。此外，记录是A5, A6 and A8.如果它们按顺序创建，看起来A7会搞砸吗？

是否可以删除ORDER文档并再次运行测试（插入和获取）？

答案 1 :(得分：0)

我不认为find（）与本地MongoDB API的findOne（）相同。

在没有类的情况下执行本机查询时会发生什么？

即。 查询queryAll = em.createNativeQuery（“db.ORDER.find（）”）; queryAll.getResultList（）;

你得到了什么？

我不认为直接支持本机find（）（但您可以在大多数查询中使用JPQL）。请记录一个错误，应该有一些方法让它工作。

相关问题
最新问题