Entity Framework不支持 SQLQuery Oracle 指定的方法

Question

我正在尝试从 oracle 数据库 table 中检索 DbResult 的列表，使用下面的代码在 Entity Framework 中执行原始 SQL 查询 6.

var query = repository.DbContext.Database.SqlQuery<DbResult>("SELECT NAME as Name,SUB_PORTFOLIO_INSTANCE_ID as SubPortfolioInstanceID,STATUS as Status FROM DGARSMART.T_SC_SERVICE");
List<DbResult> serviceList = query.ToList();

此查询抛出异常：

Specified method is not supported.

我认为这是因为查询试图解析 STATUS 列（Oracle 中的数字类型 (1,0)）以布尔状态属性属于 DbResult。我怎样才能将该查询解析为我的 DbResult class?

顺便说一句，如果我从查询中删除 STATUS 语句，它会检索数据并成功解析为 DbResult 对象。

class DbResult
{
   public string Name { get; set; }
   
   public DateTime SubPortfolioInstanceID { get; set; }

   public bool Status { get; set; }

 }

堆栈跟踪：

   at Oracle.ManagedDataAccess.Client.OracleDataReader.GetBoolean(Int32 i)
   at System.Data.Entity.Core.Objects.Internal.ShapedBufferedDataRecord.ReadBool(DbDataReader reader, Int32 ordinal)
   at System.Data.Entity.Core.Objects.Internal.ShapedBufferedDataRecord.Initialize(DbDataReader reader, DbSpatialDataReader spatialDataReader, Type[] columnTypes, Boolean[] nullableColumns)
   at System.Data.Entity.Core.Objects.Internal.ShapedBufferedDataRecord.Initialize(String providerManifestToken, DbProviderServices providerServices, DbDataReader reader, Type[] columnTypes, Boolean[] nullableColumns)
   at System.Data.Entity.Core.Objects.Internal.BufferedDataReader.Initialize(String providerManifestToken, DbProviderServices providerServices, Type[] columnTypes, Boolean[] nullableColumns)
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryInternal[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass24`1.<ExecuteStoreQueryReliably>b__23()
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass24`1.<ExecuteStoreQueryReliably>b__22()
   at System.Data.Entity.Infrastructure.DefaultExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQueryReliably[TElement](String commandText, String entitySetName, ExecutionOptions executionOptions, Object[] parameters)
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteStoreQuery[TElement](String commandText, ExecutionOptions executionOptions, Object[] parameters)
   at System.Data.Entity.Internal.InternalContext.<>c__DisplayClasse`1.<ExecuteSqlQuery>b__d()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()

我正在使用这些软件包：

<package id="EntityFramework" version="6.0.0" targetFramework="net45" />
<package id="Oracle.ManagedDataAccess" version="12.2.1100" targetFramework="net45" />
<package id="Oracle.ManagedDataAccess.EntityFramework" version="12.2.20190115" targetFramework="net45" />

Answer 1

快速而简单的解决方案是使用隐藏的 Int32 属性并将其公开为 Boolean 值。

见mapping private property entity framework code first and Entity Framework Many to many through containing object

class DbResult
{
   public string Name { get; set; }

   public DateTime SubPortfolioInstanceID { get; set; }

   [Column("Status")]
   private Int32 HiddenStatus { get; set; }

   public Boolean Status => this.HiddenStatus != 0;

 }

Entity Framework不支持 SQLQuery Oracle 指定的方法

Entity Framework SQLQuery Oracle specified method is not supported

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