Microsoft KB Archive/177358

= 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.

 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= ;PWD= ;" _ & "driver={Microsoft ODBC for Oracle};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:


 * 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.

