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Microsoft Access VBA and VB6 Module Library

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Class: CreateTableDAO in Category Access/Jet Databases : Table and Records from Total Visual SourceBook

Create a table in a Microsoft Access Jet database using VBA with DAO (not for creating tables in ADPs).

Specify the fields and their data types, create primary and secondary indexes, set SubDataSheetName to None, allow text fields to accept zero length strings, set the CheckBox display for Yes/No fields, etc.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CCreateTableDAO class.
Class_Terminate	Terminate	Clean up.
CreateTable	Method	Specify the table name to create.
IsTable	Method	Determine if the table already exists.
DeleteTable	Method	Delete the table from the database.
AddField	Method	Add a field to the table.
AddFieldAutoNumber	Method	Add an autonumber long integer field to the table (it's always a required field).
AddFieldCheckBox	Method	Add an Yes/No boolean field and set its display property to a check box.
AddFieldHyperlink	Method	Add a hyperlink field to the table.
AddFieldGeneral	Private	Main routine to add a field to the table with all the options. This is private since it's not necessary to expose it outside this class but can be changed to public if you want to call it directly.
SaveTable	Method	After all the fields are added to the TableDef, save the table and optionally create a primary key for it.
AddIndex	Method	After the table is saved, add a primary or secondary index to the table.
SetFieldDefaults	Private	Go through all the fields and set the appropriate default settings. These could not be set until the table was created.
SetObjectPropertyDAO	Private	Set the property value of an object and create it if it doesn't already exist. Used to set display type of a field, table properties, etc. This only works after the table is already saved.

Example Code for Using Class: CreateTableDAO

' Example of CCreateTableDAO
'
' To use this example, create a new module and paste this code into it.
' Two procedures are available to create tables with different options.
' Then run either of the procedures by putting the cursor in the procedure and press:
'    F5 to run it, or
'    F8 to step through it line-by-line (see the Debug menu for more options)

Private Sub Example_CCreateTableDAO()
  ' Comments: Example of using the CCreateTableDAO class to create tables with indexes using VBA and VB6.
  '           This is an example of creating an error log table that can be used by the modErrorHandlerAccess module.

  Const cstrTable As String = "tblErrorLog"
  Const cstrKeyField As String = "ErrorID"

  Dim clsCreateTable As New CCreateTableDAO
  Dim fContinue As Boolean
  Dim strError As String

  With clsCreateTable
    ' If the table already exists, the CreateTable function will automatically replace it.

    ' In this example, we check to see if the table exists and prompt the user to overwrite it. You do not need to do this to create the table.
    fContinue = True
    If .IsTable(cstrTable) Then
      fContinue = (MsgBox(cstrTable & " table already exists, do you want to overwrite it?", vbQuestion + vbYesNo) = vbYes)
    End If

    If fContinue Then
      ' If the table exists, it's deleted and replaced by the new one
      strError = .CreateTable(cstrTable)
      If strError = "" Then
        ' Make the first field an autonumber field. We'll make this a primary key later.
        .AddFieldAutoNumber cstrKeyField

        ' Add the other standard fields that are dates, text, long integer, and memo types:
        .AddField "ErrorDate", dbDate
        .AddField "ErrorString", dbText, 255
        .AddField "ErrorNumber", dbLong
        .AddField "ErrorLine", dbLong
        .AddField "ErrorProc", dbText, 255
        .AddField "ErrorLog", dbMemo

        ' After all the fields are defined, save the table and specify the primary key
        strError = .SaveTable(cstrKeyField)
        If strError = "" Then
          DoCmd.OpenTable cstrTable
          MsgBox cstrTable & " was successfully created", vbInformation
        Else
          MsgBox cstrTable & " was not successfully created:" & vbCrLf & strError, vbCritical
        End If
      Else
        MsgBox cstrTable & " could not be created:" & vbCrLf & strError, vbCritical
      End If
    End If
  End With

  ' Clean up by closing the class
  Set clsCreateTable = Nothing

End Sub

Private Sub Example_CCreateTableDAO2()
  ' Comments: Example of using the CCreateTableDAO class to create a table with a variety of field types and multiple indexes
  '           This is an example of creating an error log table that can be used by the modErrorHandlerAccess module.

  Const cstrTable As String = "tblCreateTableDAO_Test"
  Const cstrKeyField As String = "ID"

  Dim clsCreateTable As New CCreateTableDAO
  Dim strError As String

  With clsCreateTable
    ' Unlike the previous example, this overwrites the existing table without prompting the user.
    strError = .CreateTable(cstrTable)
    If strError = "" Then
      ' Make the first field an autonumber field. We'll make this a primary key later.
      .AddFieldAutoNumber cstrKeyField

      ' Add the other standard fields that are dates, text, long integer, and memo types:
      .AddField "Long Text", dbText, 255
      .AddField "Short Text", dbText, 10
      .AddField "CreateDate", dbDate
      .AddField "Long Integer", dbLong
      .AddField "Double", dbDouble
      .AddField "Integer", dbInteger
      .AddField "Money", dbCurrency
      .AddField "Memo", dbMemo

      ' Add a Yes/No field (note that its defined by dbBoolean as there's no dbYesNo)
      .AddField "Status", dbBoolean

      ' Email field as a hyperlink, and set it to be required
      .AddFieldHyperlink "Email", True

      ' Attachment field
      .AddField "Files", dbAttachment

      ' After all the fields are defined, save the table and specify the primary key. Default settings for tables and fields are also applied.
      strError = .SaveTable(cstrKeyField)
      If strError = "" Then
        ' Create a secondary index on two fields
        strError = .AddIndex("EmailStatus", "Email,Status", False, True, True)
      End If

      If strError = "" Then
        DoCmd.OpenTable cstrTable
        MsgBox cstrTable & " was successfully created", vbInformation
      Else
        MsgBox cstrTable & " was not successfully created:" & vbCrLf & strError, vbCritical
      End If
    Else
      MsgBox cstrTable & " could not be created:" & vbCrLf & strError, vbCritical
    End If
  End With

  ' Clean up by closing the class
  Set clsCreateTable = Nothing

End Sub

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