2011-12-15 70 views
0

我正在嘗試在我的代碼中實現準備好的Stages,作爲向從任何通用服務器中的表中檢索的sql命令添加參數的一種方式。我似乎無法做到。我得到以下錯誤:準備對帳單問題

ORA-00936: missing expression 
ORA-00936: missing expression 

Prepare Statement: select VALUE from RWOL_CONFIGURATION where ID = @ItemId 

我的猜測是,它只是沒有取代價值,但我不知道我失蹤了。

我正在嘗試以下來實現所需的結果。我創建我的對象,從數據庫的表中獲取一個查詢字符串,將其添加到該命令,將參數添加到列表對象,然後使用下面顯示的最終方法將它們聯繫在一起並運行查詢:

//This function gets me a config item from the database 
private string GetConfigurationItem(string itemId) 
    { 
     //new database connection object 
     OleDataBaseConnection oleDataBaseConnection = new OleDataBaseConnection(); 

     //todo get this query from the sql factory 
     SqlFactory sqlFactory = new SqlFactory(); 

     //This method gets the query string from the database 
     string sqlQuery = sqlFactory.GetQueryString("GET_CONFIGURATION_ITEM", m_dialect); 

     if (!String.IsNullOrEmpty(sqlQuery)) 
     { 
      //add parameter to list 
      oleDataBaseConnection.AddStoredProcedureParameter("@ItemId", itemId); 

      //execute the sql command after adding the parameters to the command 
      oleDataBaseConnection.OleExecutePrepareStatementWithParametersQuery(sqlQuery); 

      string returnValue = oleDataBaseConnection.NextRecord() ? oleDataBaseConnection.GetFieldById(0) : "Error"; 

      oleDataBaseConnection.Close(); 

      return returnValue; 
     } 
     else 
     { 
      return "ERROR"; 
     } 

    } 

//adds the parameters to list objects ready for the next method 
public void AddParameter(string parameter, object value) 
    { 
     m_parameterName.Add(parameter); 
     m_parameterValue.Add(value); 
    } // End of void AddParameter() 

    /// <summary> 
    /// Executes a command with the parameters passed to AddParameter(parameterName, parameterValue) and creates a recordset. 
    /// </summary> 
    /// 
    /// <param name="commandName">The name of the stored procedure to execute.</param> 
    public bool OleExecutePrepareStatementWithParametersQuery(string commandName) 
    { 
     if (String.IsNullOrEmpty(commandName)) 
     { 
      return false; 
     } 

     try 
     { 
      PrepareConnection(); 

      m_oleDatabaseCommand.CommandText = commandName; 
      m_oleDatabaseCommand.CommandType = CommandType.StoredProcedure; 

      if (m_storedProcedureParameterName.Count != 0) 
      { 
       for (int i = 0; i < m_storedProcedureParameterName.Count; i++) 
       { 
        m_oleDatabaseCommand.Parameters.AddWithValue(m_storedProcedureParameterName[i], m_storedProcedureParameterValue[i]); 
       } 

       m_storedProcedureParameterName.Clear(); 
       m_storedProcedureParameterValue.Clear(); 
      } 

      m_hasRecordSet = true; 

      m_oleDatabaseDataReader = m_oleDatabaseCommand.ExecuteReader(); 

      return true; 
     } 
     catch (Exception ex) 
     { 
      if (QueueErrors) 
      { 
       QueuedErrorsList.AppendLine(ex.Message); 
       QueuedErrorsList.AppendLine("Prepare Statement: " + storedProcedureName); 
       QueuedErrorsList.AppendLine(); 

       QueuedErrorCount++; 

       return false; 
      } 

      try 
      { 
       Close(); 
      } 
      catch 
      { 
      } 

      throw new Exception(ex.Message + "\r\n\r\nPrepare Statement: " + storedProcedureName); 
     } 
    } // End of void OleExecutePrepareStatementWithParametersQuery() 

對不起,如果有很多代碼,但它是相當簡單的,我認爲這將有助於解決問題。

有沒有什麼明顯的,會阻止這個工作?

+0

請發佈`sqlQuery`的值。 – Oded 2011-12-15 11:30:16

+0

另外,你使用OleDb而不是Oracle提供者? – Oded 2011-12-15 11:32:38

回答

2

問題是OleDB提供程序不支持查詢中的命名參數。

此:

select VALUE from RWOL_CONFIGURATION where ID = @ItemId 

應該是:

select VALUE from RWOL_CONFIGURATION where ID = ? 

請參閱MSDN上OleDbParameter的例子。