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Open RS with Parameterized Queries (using ? rather than Named parameters)

Posted on 2013-12-24
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Last Modified: 2013-12-24
I recently learned how to do Paramerized queries using '?' in the SQL and an array of variants for the Parameters.  But I can only figure out how to do this using ADODB.Connection object and an ADODB.Command object with a Command.Execute()

Example:
Cmd.Connection = Conn
Cmd.CommandText = "SELECT * FROM TABLE WHERE FIELD1 = ? AND FIELD2 = ?"
Set RS = Cmd.Execute(RecordsAffected,Array(10,"ABC"))

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(where Array(10,"ABC") represents an Array of Variants the way the VBScript would)

But what I need to do is an RS.Open command where I can set properties of the Record Set such as CursorType and LockType.  For example, I'd logically like to do the following:
Cmd.CommandText = "SELECT * FROM TABLE WHERE FIELD1 = ? AND FIELD2 = ?"
Cmd.Parameters = Array(10,"ABC")
RS.Open(Cmd, adOpenDynamic, adLockPessimistic) 

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But this is not valid code (you can not assign an array of variants to the Cmd Parameters).

Now I know how to accomplish this creating individual parameter objects and using named parameters in the SQL.  But that method seems to require that I define the data type for each parameter.  My situation is that I must convert a bunch of SQL commands to parameterized SQL commands in a program that I'm not familiar with and most field values are contained in variables (whos datatype isn't always apparent).

So I know I can take the time to look up each field in the database and determine how to create parameters for each field and use named parameters.

But I'd get things going much faster (with less room for mistakes in picking the wrong data types) if I could simply replace field values with '?' and pass in an array of variants for the parameters.

NOTE: I'm utilizing ADODB objects in a VB6 project.
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Question by:HooKooDooKu
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I sort of figured it out.

I can still use '?' for the parameters and simply create individual Parameter objects that get appended to the Cmd object.  But to deal with the array of variants, I had to create a subroutine that looked at the VarType of the parameter and set the data type base on that.

Here's the code I'm using where I look through my Parameters stored in the array of variants names m_Parameters.
        Select Case VarType(m_Parameters(I))
            Case vbInteger Or vbLong
                Set P = m_objCmd.CreateParameter(, adInteger, adParamInput)
            Case vbDate
                Set P = m_objCmd.CreateParameter(, adDate, adParamInput)
            Case vbString
                Set P = m_objCmd.CreateParameter(, adBSTR, adParamInput)
                P.Size = Len(m_Parameters(I))
            Case vbSingle
                Set P = m_objCmd.CreateParameter(, adSingle, adParamInput)
            Case vbDouble
                Set P = m_objCmd.CreateParameter(, adDouble, adParamInput)
            Case vbCurrency
                Set P = m_objCmd.CreateParameter(, adCurrency, adParamInput)
            Case vbBoolean
                Set P = m_objCmd.CreateParameter(, adBoolean, adParamInput)
            Case vbByte
                Set P = m_objCmd.CreateParameter(, adTinyInt, adParamInput)
            Case Else
                m_Parameters(I) = ""
                Set P = m_objCmd.CreateParameter(, adBSTR, adParamInput)
                P.Size = 0
        End Select
        P.Value = m_Parameters(I)
        Call m_objCmd.Parameters.Append(P)

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