Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Check for existence of a field in a Microsoft Access table

Posted on 2012-04-04
6
Medium Priority
?
401 Views
Last Modified: 2012-04-04
I have a vba program that alters a linked table - a new field is added.  Before I create the field, I need to make sure that it doesn't already exist.  Here is the code I have to do the alter:

Public Function Alter_Table()
    Dim db As DAO.Database
    Dim tdf As DAO.TableDef
    Dim fld As DAO.Field
    Dim strSQL As String
   
    On Error GoTo Alter_Table_Exit
   
    Set db = DBEngine.OpenDatabase("C:\Quote Templates\Data Files\Quote Data.mdb")
    Set tdf = db.TableDefs("tbl_Quotes")
   
    Set fld = tdf.CreateField("Freight_PO", dbBoolean)
    fld.DefaultValue = 0
    tdf.Fields.Append fld
    Set fld = Nothing
   
    Set fld = tdf.CreateField("Freight_Amt", dbCurrency)
    fld.DefaultValue = 0
    tdf.Fields.Append fld
    Set fld = Nothing
    Set tdf = Nothing
   
    db.Close
    Set db = Nothing

    Set db = CurrentDb()
    Set tdf = db.TableDefs("tbl_Quotes")
    tdf.RefreshLink

Alter_Table_Exit:
   
    DoCmd.OpenQuery ("qupd_Freight_Amt_0")
     
    Set tdf = Nothing
    db.Close
    Set db = Nothing
    Exit Function
   
End Function
0
Comment
Question by:Marilync1266
  • 3
  • 3
6 Comments
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 37807717
Set db = DBEngine.OpenDatabase("C:\Quote Templates\Data Files\Quote Data.mdb")
    Set tdf = db.TableDefs("tbl_Quotes")

'add this codes

For Each fld In tdf.Fields
    If fld.Name = "Freight_PO" Then
        MsgBox "Field exists"
        Exit Function
    End If
Next

'end of codes    to add

Set fld = tdf.CreateField("Freight_PO", dbBoolean)
    fld.DefaultValue = 0
    tdf.Fields.Append fld
    Set fld = Nothing
0
 

Author Comment

by:Marilync1266
ID: 37807794
If it exists - I don't want to display a message, I need to continue in the code to check the next field - Freight_Amt
0
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 37807811
ok, how many fields are you going to check?
0
Visualize your virtual and backup environments

Create well-organized and polished visualizations of your virtual and backup environments when planning VMware vSphere, Microsoft Hyper-V or Veeam deployments. It helps you to gain better visibility and valuable business insights.

 

Author Comment

by:Marilync1266
ID: 37807815
Just 2 - freight_po and freight_amt
0
 
LVL 120

Accepted Solution

by:
Rey Obrero (Capricorn1) earned 2000 total points
ID: 37807856
Public Function Alter_Table()
    Dim db As DAO.Database
    Dim tdf As DAO.TableDef
    Dim fld As DAO.Field
    Dim strSQL As String
   
    On Error GoTo Alter_Table_Exit
   
    Set db = DBEngine.OpenDatabase("C:\Quote Templates\Data Files\Quote Data.mdb")
    Set tdf = db.TableDefs("tbl_Quotes")
   
   Dim blnFld1 As Boolean, blnFld2 As Boolean
   For Each fld In tdf.Fields
        If fld.Name = "Freight_PO" Then
            blnFld1 = True
        End If
        If fld.Name = "freight_amt" Then
            blnFld2 = True
        End If
   
    Next

   If blnFld1 = False Then
            Set fld = tdf.CreateField("Freight_PO", dbBoolean)
            fld.DefaultValue = 0
            tdf.Fields.Append fld
            Set fld = Nothing
   End If
   
      If blnFld2 = False Then

            Set fld = tdf.CreateField("Freight_Amt", dbCurrency)
            fld.DefaultValue = 0
            tdf.Fields.Append fld
            Set fld = Nothing
            Set tdf = Nothing
   End If
    db.Close
    Set db = Nothing

    Set db = CurrentDb()
    Set tdf = db.TableDefs("tbl_Quotes")
    tdf.RefreshLink

Alter_Table_Exit:
   
    DoCmd.OpenQuery ("qupd_Freight_Amt_0")
     
    Set tdf = Nothing
    db.Close
    Set db = Nothing
    Exit Function
   
End Function
0
 

Author Comment

by:Marilync1266
ID: 37807906
Excellent!  Thanks!
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When you see single cell contains number and text, and you have to get any date out of it seems like cracking our heads.
If you need a simple but flexible process for maintaining an audit trail of who created, edited, or deleted data from a table, or multiple tables, and you can do all of your work from within a form, this simple Audit Log will work for you.
The viewer will learn how to simulate a series of sales calls dependent on a single skill level and learn how to simulate a series of sales calls dependent on two skill levels. Simulating Independent Sales Calls: Enter .75 into cell C2 – “skill leve…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

578 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question