10

我正在创建一个使用 EF6.0.0.0和 ODP.NetOracle.ManagedDataAccess版本4.121.2.0进行数据访问的 MVC 应用程序。

在我的Controller被​​调用EmployeeController中，我有以下代码片段：

public ActionResult Details(int id) {
    try {
        EmployeeContext employeeContext = new EmployeeContext();
        Employee employee = employeeContext.Employees.Single(x => x.Id == id); //Here the exception occurs!
        return View(employee);
    } catch (Exception e) {
        return View(e);
    }
}

当我加载Employee/Details.cshtml页面时，出现以下异常：

“执行命令定义时发生错误。有关详细信息，请参阅内部异常。”

在内部异常中，它说：

ORA-00942: 表或视图不存在

这让我感到困惑，因为在我的 Oracle 数据库中，该表肯定存在（我使用 Toad for Oracle 进行了检查）：

在此处输入图像描述

数据库本身的connectionString连接字符串与我用于其他项目的连接字符串相同，并且我能够毫无困难地从数据库中查询数据。

这是我的Employee班级在以下声明中的声明方式Models/Employee.cs：

using System.ComponentModel.DataAnnotations.Schema;
.
.
.
[Table("TBLEMPLOYEE")] //the same table name
public class Employee {
    public int Id { get; set; }
    public string Name { get; set; }
    public string Gender { get; set; }
    public DateTime DateOfBirth { get; set; }
    public int EmployeeType { get; set; }
    public double? AnnualSalary { get; set; }
    public double? HourlyPay { get; set; }
    public double? HoursWorked { get; set; }
    public string City { get; set; }
}

而我Models/EmployeeContext.cs的只是由一个元素组成：

using System.Data.Entity;
.
.
.
public class EmployeeContext : DbContext {
    public DbSet<Employee> Employees { get; set; }
}

在Global.asax.cs文件中，我已经为EmployeeContext模型初始化了数据库：

protected void Application_Start() { //executed at the very beginning               
    Database.SetInitializer<MvcWebApplication1.Models.EmployeeContext>(null); //null -> no initialization strategy
    AreaRegistration.RegisterAllAreas();
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);
}

如果表格不存在，我仍然会收到什么错误？这里可能出了什么问题？任何建议如何调试这种情况？

编辑：

当我评估 时employeeContext.Employees，我得到以下值：

{SELECT 
"Extent1"."Id" AS "Id", 
"Extent1"."Name" AS "Name", 
"Extent1"."Gender" AS "Gender", 
"Extent1"."DateOfBirth" AS "DateOfBirth", 
"Extent1"."EmployeeType" AS "EmployeeType", 
"Extent1"."AnnualSalary" AS "AnnualSalary", 
"Extent1"."HourlyPay" AS "HourlyPay", 
"Extent1"."HoursWorked" AS "HoursWorked", 
"Extent1"."City" AS "City"
FROM "dbo"."TBLEMPLOYEE" "Extent1"}

编辑2：

使用：

employeeContext.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);

我在调试输出窗口中得到以下信息：

SELECT 
"Extent1"."Id" AS "Id", 
"Extent1"."Name" AS "Name", 
"Extent1"."Gender" AS "Gender", 
"Extent1"."DateOfBirth" AS "DateOfBirth", 
"Extent1"."EmployeeType" AS "EmployeeType", 
"Extent1"."AnnualSalary" AS "AnnualSalary", 
"Extent1"."HourlyPay" AS "HourlyPay", 
"Extent1"."HoursWorked" AS "HoursWorked", 
"Extent1"."City" AS "City"
FROM "dbo"."TBLEMPLOYEE" "Extent1"
WHERE ("Extent1"."Id" = :p__linq__0) AND (ROWNUM <= (2) )

编辑3：

这就是我的连接字符串的样子，以防万一

  <connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-MvcWebApplication1-20160212010850.mdf;Initial Catalog=aspnet-MvcWebApplication1-20160212010850;Integrated Security=True"
      providerName="System.Data.SqlClient" />
    <add name="EmployeeContext" connectionString="Data source=thisisfakedatasource;user id=thisisfakename;password=thisisfakepassword;persist security info=True"
      providerName="Oracle.ManagedDataAccess.Client"/>
  </connectionStrings>

entityFramework 的设置如下：

  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="Oracle.ManagedDataAccess.Client" type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </providers>
  </entityFramework>

任何线索可能是问题所在？

附加信息：

异常堆栈跟踪：

e.StackTrace

   at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
   at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
   at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__6()
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
   at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__5()
   at System.Data.Entity.Infrastructure.DefaultExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
   at System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0()
   at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3[TResult](IEnumerable`1 sequence)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
   at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[TResult](Expression expression)
   at System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.Single[TSource](IQueryable`1 source, Expression`1 predicate)
   at MvcWebApplication1.Controllers.EmployeeController.Details(Int32 id) in c:\myapp\Controllers\EmployeeController.cs:line 25

内部异常堆栈跟踪：

(e.InnerException).StackTrace

   at OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution(OracleConnectionImpl connectionImpl, Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, OracleException& exceptionForArrayBindDML, Boolean& hasMoreRowsInDB, Boolean bFirstIterationDone)
   at OracleInternal.ServiceObjects.OracleCommandImpl.ExecuteReader(String commandText, OracleParameterCollection paramColl, CommandType commandType, OracleConnectionImpl connectionImpl, OracleDataReaderImpl& rdrImpl, Int32 longFetchSize, Int64 clientInitialLOBFS, OracleDependencyImpl orclDependencyImpl, Int64[] scnForExecution, Int64[]& scnFromExecution, OracleParameterCollection& bindByPositionParamColl, Boolean& bBindParamPresent, Int64& internalInitialLOBFS, OracleException& exceptionForArrayBindDML, Boolean isDescribeOnly, Boolean isFromEF)
   at Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteReader(Boolean requery, Boolean fillRequest, CommandBehavior behavior)
   at Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c)
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
   at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
4

2 回答 2

11

正如DevilSuichiroData Table在评论中所建议的那样，找不到的问题是由于使用错误。默认情况下，EF 6用作默认架构，而我的架构不是. 为了使模型具有默认模式，需要覆盖事件：SchemadbodboOnModelCreating

public class EmployeeContext : DbContext {
    public DbSet<Employee> Employees { get; set; }
    protected override void OnModelCreating(DbModelBuilder modelBuilder) {
        modelBuilder.HasDefaultSchema("myschema");
    }
}

另外，感谢Ivan Stoev建议检查 EF 生成的 SQL。

于 2016-02-15T09:12:24.660 回答
1

我们遇到了同样的问题。我们发现在 edmx 文件中引用了错误的数据库模式：

<EntitySet Name="MyTable" EntityType="Self.MyTable" Schema="**wrongSchemaName**" store:Type="Tables" />

通过删除模式名称，我们的问题得到了解决。

<EntitySet Name="MyTable" EntityType="Self.MyTable" Schema="" store:Type="Tables" />
于 2020-02-12T08:42:09.233 回答