在 VBScript 中的 ADO 中使用事务和参数

Question

I'm a bit stuck with parameters and transactions in ADO, in VBScript and Access. Basically, I'm working through a massive loop and writing the results to a database, so I need to wrap it in a transaction otherwise it takes ages.

I've written the below script which works for a single parameter, (although this seems a bit of a long way of doing it, so if anyone knows a shorter way, please shout). However I can't work out how to expand this to two parameters:

objConn.BeginTrans  

  set oParm = CreateObject("ADODB.Parameter")
    oParm.Value = ""
    oParm.Type = 200
    oParm.Direction = 1
    oParm.Size = 100

  Set oCmd = CreateObject("ADODB.Command")
    oCmd.ActiveConnection = objConn
    oCmd.commandText = "INSERT INTO table (field) VALUES (?)"
    oCmd.commandType = 1
    oCmd.Parameters.Append oParm


    'Big loop here that goes through lots of lines.

      oCmd.Execute ,"Field",1

    'Loop 

objConn.CommitTrans

For example, if I wanted to expand this to:

oCmd.commandText = "INSERT INTO table (field1, field2) VALUES (?,?)"

I can't figure out what I do with my parameters. I'm sure I'm just being stupid here and not quite following how these work.

Answer 1

I've never tried passing parameter values through the Execute method, so I can't quite say what's wrong. I will say that the documentation states that the second argument should be an array of values, so maybe if you tried Array("Field1Val", "Field2Val") , that would work.

What I usually do is give each parameter a name, then you can reference it within your loop to change its value. You can use any name you like, as long each parameter has a unique name. As an example:

' Sometime before your loop
oParm.Name = "foobar"

' Start loop
    oCmd.Parameters("foobar").Value = "someValue"
    oCmd.Execute , , 1
' End loop

---

As far as shortening the code, the only suggestion I can make is using the CreateParameter method to, well, create the parameter. That will allow you to set all the relevant properties on one line.

Set oParm = oCmd.CreateParameter("foobar", 200, 1, 100)