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在尝试使用最新的 ODP.NET 托管驱动程序查询 Oracle 数据库时，我正在尝试参数化 ROWNUM。

SQL 查询是“...WHERE ROWNUM <= :ROWSTOLOCK”

当我尝试添加 ROWNUM 作为参数时，如下所示：

dbCommand.Parameters.Add("ROWSTOLOCK", Oracle.ManagedDataAccess.Client.OracleDbType.Int64, 25 , ParameterDirection.Input);

我确实尝试执行查询

dbCommand.ExecuteNonQuery()

我得到一个例外：

“附加信息：ORA-01008：并非所有变量都绑定”

Row num 是一个数字，我们可以在之前的 Stack Overflow 帖子中看到：什么是 ROWNUM 的 OracleType

但是我找不到 Oracle.ManagedDataAccess.Client.OracleDbType.Number。我尝试在 Oracle.ManagedDataAccess.Client.OracleDbType 枚举中使用所有其他可用的数字类型。

我发现很难认为这是托管驱动程序的限制（数字类型不可用）。

代码片段：

        string sql = "...WHERE  ROWNUM & lt;= :ROWSTOLOCK";
        string connectionString = "my connection string";
        Oracle.ManagedDataAccess.Client.OracleConnection connectiont = new Oracle.ManagedDataAccess.Client.OracleConnection(connectionString);

        Oracle.ManagedDataAccess.Client.OracleCommand dbCommand = new Oracle.ManagedDataAccess.Client.OracleCommand(sql, connectiont);
        dbCommand.Parameters.Add("ROWSTOLOCK", Oracle.ManagedDataAccess.Client.OracleDbType.Decimal, 25, ParameterDirection.Input);
        connectiont.Open();
        int rowsAffected = dbCommand.ExecuteNonQuery();

完全例外：

ORA-01008: not all variables bound
Oracle Data Provider for .NET, Managed Driver
       at OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution(OracleConnectionImpl connectionImpl, Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, OracleException& exceptionForArrayBindDML, Boolean& hasMoreRowsInDB, Boolean bFirstIterationDone)
       at 
OracleInternal.ServiceObjects.OracleCommandImpl.VerifyExecution(OracleConnectionImpl connectionImpl, Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, OracleException& exceptionForArrayBindDML, Boolean bFirstIterationDone)
       at OracleInternal.ServiceObjects.OracleCommandImpl.ExecuteNonQuery(String commandText, OracleParameterCollection paramColl, CommandType commandType, OracleConnectionImpl connectionImpl, Int32 longFetchSize, Int64 clientInitialLOBFS, OracleDependencyImpl orclDependencyImpl, Int64[]& scnFromExecution, OracleParameterCollection& bindByPositionParamColl, Boolean& bBindParamPresent, OracleException& exceptionForArrayBindDML, Boolean isFromEF)
       at Oracle.ManagedDataAccess.Client.OracleCommand.ExecuteNonQuery()
       at QuickTest1.Program.Main(String[] args) in C:\Users\george\Documents\Visual Studio 2015\Projects\Program.cs:line 44
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

任何帮助都非常感谢。

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1 回答 1

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无法编译该片段。您使用 dbCommand 引用，并在声明它之后就行。您还可以添加参数，然后实例化 OracleCommand 的新实例。所以该命令没有任何参数。然后我希望它在 ORA-01745: invalid host/bind variable name 上失败，因为 ROWNUM 是保留字。

于 2015-10-27T18:01:36.473 回答