How To Pass a Date Value to a Oracle Stored Procedure (177358)

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.

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

On the new Form add a CommandButton.

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

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:

This stored procedure uses the DEMO account EMP table supplied in a standard Oracle 7.3 installation.
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.

How To Pass a Date Value to a Oracle Stored Procedure (177358)

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