实体框架左外联接和分组到抛出:ORA-00907:缺少右括号

Question

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。

我们是一个使用实体框架的团队，现在已经有 2 年了，生成的代码与 SQL Server 2008 完美配合。现在，在将数据库迁移到 Oracle 11 express r2g2 后，我们正在测试相同的代码，并且所有使左外连接或分组为选择抛出异常的指令都显示此调用堆栈：

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:WorkFuturaSmartDesignFutura.BusinessLogicServicesDemandeHospitalisationServicesDemandeHospitalisationService.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，提前谢谢。

Answer 1

这是由于实体框架生成的代码：交叉/外部应用; 甲骨文不支持。这是在连接上报道的，https://connect.microsoft.com/VisualStudio/feedback/details/739458/linq-query-whene-used-with-oracle-11-g2-getting-ora-00907-missing-right-parenthesis

任何解决方法都将在MS Connect平台上受到赞赏

Answer 2

当我的 EF 查询有太多"包含"时，我在 EF 5 和 Oracle 11g 中遇到了此错误。在我的情况下 7 英寸。包含"会导致此错误。

        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来获取我的数据：

        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();