Microsoft KB Archive/177358

Knowledge Base

How To Pass a Date Value to a Oracle Stored Procedure

Article ID: 177358

Article Last Modified on 7/1/2004

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APPLIES TO

• Microsoft Visual Basic 5.0 Enterprise Edition
• Microsoft Visual Basic 6.0 Enterprise Edition

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This article was previously published under Q177358

SUMMARY

This article gives an example of passing a Date datatype value to an Oracle stored procedure and getting back a result from the stored procedure. The example below uses RDO 2.0, and the second version, 2.73.7253, of the Microsoft Oracle ODBC driver. Note that the first version of the Microsoft Oracle ODBC driver, Ver 2.00.006325, does not support passing dates to a stored procedure.

This example also demonstrates how the ODBC will take care of converting the Visual Basic Date to the acceptable Oracle Date format.

MORE INFORMATION

Create a new project in Visual Basic and reference the Microsoft Remote Data Object 2.0 under Project/References.

1. On the new Form add a CommandButton.

2. Paste the following code in the General Declarations section of the Form:

      Option Explicit
      Dim Cn As New rdoConnection
      Dim En As rdoEnvironment
      Dim Qd As New rdoQuery
      Dim Rs As rdoResultset
      Dim Conn As String
      Dim tempcnt As Integer
   
      Private Sub Command1_Click()
   
          Dim strDate, strQd$, strQd1$
          strDate = InputBox("Enter the date you wish to retrieve:")
          Qd(0) = CDate(strDate)
          Qd.Execute
          strQd = Mid(Qd(1), 12)
          strQd1 = Mid(Qd(1), 1, 11)
          Debug.Print "For the date you entered: " & strQd1 & vbCrLf & strQd
          MsgBox "For the date you entered: " & strQd1 & vbCrLf & strQd
   
      End Sub
   
      Private Sub Form_Load()
   
          Command1.Caption = "Start"
          'Change each <> field to the appropriate value for your system
          Conn = "UID=<uid>;PWD=<password>;" _
          & "driver={Microsoft ODBC for Oracle};SERVER=<server>;"
   
          Set En = rdoEnvironments(0)
          En.CursorDriver = rdUseOdbc
          With Cn
              .Connect = Conn
              .CursorDriver = rdUseOdbc
              .EstablishConnection rdDriverNoPrompt, False
          End With
   
          Set Qd.ActiveConnection = Cn
   
          Qd.SQL = "{call testdate1(?,?)}"
          Qd(0).Direction = rdParamInput
          Qd(1).Direction = rdParamOutput
          Qd(0).Type = rdTypeDATE
   
      End Sub
   
      Private Sub Form_Unload(Cancel As Integer)
          Qd.Close
          Cn.Close
          En.Close
   
      End Sub
   
                       

3. Create an Oracle stored procedure using this script:

      CREATE OR REPLACE PROCEDURE TESTDATE1(
   
      /* This is called by a Visual Basic project that passes in */ 
      /* a Date parameter in any Visual Basic-acceptable format and */ 
      /* returns a Count value and the input date in */ 
      /* a different format */ 
   
         INDATE IN DATE,
         OUTSTR OUT VARCHAR2 )
   
      IS
   
         m_Count NUMBER;
   
      BEGIN
         SELECT
         COUNT(*) INTO m_Count
         FROM EMP WHERE HIREDATE < INDATE;
   
         OUTSTR:=TO_CHAR(INDATE,'DD-Mon-YYYY') ||
         'The Count is: '|| TO_CHAR(m_Count);
   
      END;
      / 
   
                       

Run the project by pressing the F5 key and, when prompted, enter a date in any Visual Basic-acceptable date format that is greater than Jan 1, 1983 to get a count value of all records in the EMP table.

Additional Information:

1. This stored procedure uses the DEMO account EMP table supplied in a standard Oracle 7.3 installation.
2. This demonstrates that the Microsoft Oracle ODBC driver will handle Date conversion from an acceptable Visual Basic format to an acceptable Oracle format.

The return should be a count of 14 and the date that was entered in standard military format of DD-MON-YYYY.

REFERENCES

For additional information, please see the following article in the Microsoft Knowledge Base:

167225 How To Access an Oracle Database Using RDO

Keywords: kbhowto kboracle kbrdo KB177358

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