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我在基于实体框架的数据访问中使用实体框架来定位多个数据库。

我们是一个使用 Entity Framework 的团队，已经 2 年了，生成的代码与 sql server 2008 完美配合。现在，我们正在将数据库迁移到 Oracle 11 express r2g2 后测试相同的代码，以及所有使左外的指令加入或分组到显示此调用堆栈的选择抛出异常：

System.Data.EntityCommandExecutionException was unhandled by user code
Message=An error occurred while executing the command definition. See the inner exception for details.
Source=System.Data.Entity
StackTrace:
at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at Futura.BusinessLogic.Services.DemandeHospitalisationServices.DemandeHospitalisationService.GetMedecinList() in C:\Work\FuturaSmartDesign\Futura.BusinessLogic\Services\DemandeHospitalisationServices\DemandeHospitalisationService.cs:line 87
at GetMedecinList(DomainService , Object[] )
at System.ServiceModel.DomainServices.Server.ReflectionDomainServiceDescriptionProvider.ReflectionDomainOperationEntry.Invoke(DomainService domainService, Object[] parameters)
at System.ServiceModel.DomainServices.Server.DomainOperationEntry.Invoke(DomainService domainService, Object[] parameters, Int32& totalCount)
at System.ServiceModel.DomainServices.Server.DomainService.Query(QueryDescription queryDescription, IEnumerable`1& validationErrors, Int32& totalCount)
InnerException: Oracle.DataAccess.Client.OracleException
Message=ORA-00907: missing right parenthesis
Source=Oracle Data Provider for .NET
ErrorCode=-2147467259
DataSource=Calys
Number=907
Procedure=""
StackTrace:
at Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure, Boolean bCheck, Exception innerException)
at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, OracleConnection conn, String procedure, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, Boolean bCheck, Exception innerException)
at Oracle.DataAccess.Client.OracleCommand.ExecuteReader(Boolean requery, Boolean fillRequest, CommandBehavior behavior)
at Oracle.DataAccess.Client.OracleCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
InnerException:
Message=Oracle 11.2.0.2.0 ne prend pas en charge APPLY
InnerException:

任何帮助将不胜感激，在此先感谢。

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2 回答 2

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这是由于实体框架生成的代码：CROSS/OUTER APPLY；甲骨文不支持。这是在 Connect 上报告的， https://connect.microsoft.com/VisualStudio/feedback/details/739458/linq-query-whene-used-with-oracle-11-g2-getting-ora-00907-missing-right -插入语

在 MS Connect 平台上将不胜感激任何解决方法

于 2012-05-18T11:26:57.343 回答
2

当我的 EF 查询有太多“包含”时，我在 EF 5 和 Oracle 11g 中遇到了这个错误。在我的情况下 7 ".Include" 导致此错误。

        var myEntity = __DbContext.Get<MyEntity>()
            .Include("Property1")
            .Include("Property2")
            .Include("Property3")
            .Include("Property4")
            .Include("RelatedEntities.Property1")
            .Include("RelatedEntities.Property2")
            .Include("RelatedEntities.Property3")
            .First(c => c.Id == id);

我将其更改为进行两个查询以获取我的数据：

        var myEntity = __DbContext.Get<MyEntity>()
            .Include("Property1")
            .Include("Property2")
            .Include("Property3")
            .Include("Property4")
            .First(c => c.Id == id);

        myEntity.RelatedEntities = __DbContext.Get<RelatedEntity>()
            .Include("Property1")
            .Include("Property2")
            .Include("Property3")
            .Where(re => re.MyEntityId == myEntity.Id)
            .ToList();
于 2015-01-08T14:53:03.843 回答