Difference between revisions of "MSA-Base Faq"

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Then, go to <code>File|New|Database</code>, choose "Connect to an existing datbase", and select the "Microsoft Access" database type from the list. On the next page, you then select the .mdb file you want to access - that's it!
Then, go to <code>File|New|Database</code>, choose "Connect to an existing datbase", and select the "Microsoft Access" database type from the list. On the next page, you then select the .mdb file you want to access - that's it!
This will give allow to read and update the data in your Acess tables.
This will allow you to read and update the data in your Acess tables.
You cannot read / modify or use the Access forms, queries, or reports.
You cannot read / modify or use the Access forms, queries, or reports.

Revision as of 13:53, 29 September 2006

Common questions and answers for those migrating from MS Access to OO.o Base.

This is a user community effort - add to the knowledge base if you can.

Please however try to keep the questions and answers general. If there is an answer regarding a feature specifc version of MSA then include the version number also.

Specifically, please only update the wiki if you have an answer for the question you are adding. ( If you may need to get back shortly with the answer don't let that stop you from getting the queston in first however - just come back before long )

For asking specific questions or for general help it would be appropriate to then ask on either the: Base Forum or on the Base users mailing list.

Can I use Microsoft Access databases (.mdb) in Base?

On Windows: yes. You cannot open them directly via File|Open, but you can access the data therein. For this, you need the Microsoft Data Access Components, which are available from Microsoft for free. (In Windows XP, they're already included, so you need them for older Windows versions only.)

Then, go to File|New|Database, choose "Connect to an existing datbase", and select the "Microsoft Access" database type from the list. On the next page, you then select the .mdb file you want to access - that's it!

This will allow you to read and update the data in your Acess tables.

You cannot read / modify or use the Access forms, queries, or reports.

Can I read my Base database from MS Access?

There is no way to use the table linking mechanisim in Access to connect to a Base database.

It is possible for a Base database to update data in the Access database. At this time this will require however that the Access database be opened and locked by the Base file.

Data could also be passed back to the Access database by creating a linked CSV file in the Base database. Then linking to this CSV file to a table in the Access database.

Can I create an Access database (mdb file) with Base?

No. Base can not create a new Access database file; or new tables, queries, forms etc. within an existing mdb file.

Can I create a Switchboard in Base?

Base does not currently have a switchboard style form wizard. It is possible to achieve a very similar effect however using either of two techinques.

Opening a default form via a macro

Using a stand alone form to launch the Base database

Our Access databases uses "Workgroup Security" to control group/user permission to view/maintain data?

This question points out what is a fundamental difference between OOoBase and MSAccess . In the case of MSA (MS Access) there is one and only one database engine in use - although you may link tables in MSA to external datasource - MS Jet is still the only database engine actually used by MSA.

In Base (OOoBase) this is not the case at all. The Base database document is simply a front end ( client application ) to a variaty of database engines. In one of these forms it embeddeds a HSQLDB database into the ODB file itself, many people simply see this as the only Base database format. That is totally mistaken. In this instance of an embedded database there is no support for multiple users and of course no support for groups therefore. However, that is only one of the ways Base can be configured.

You are free to use Base as the front end to a HSQLDB database in server mode. HSQLDB is a very small footprint, low administraton database engine and in server mode has full support for users / groups. For larger numbers of users you could just as easily configure Base to work with MySQL, PostgrSQL, Firebird, Oracle or MS SqlServer.

There is another significant difference between MSA and Base regarding this then. In MSA you would deploy one MDB (or one of its variants ) file, then have each user in the workgroup see this file and open it.

In Base each user would have their own ODB file and each of these would be connected to the shared data server. In this way each user would have their own space for custom queries and reports - but it makes distribution of common forms, queries and reports more work.

Is a Form in Base different from a Form in MSA?


There are very real differnces between how Forms are implemented in Access and Base.

Virtual forms within Base forms

Where are the Delete / Upate queries?

Base does not currently support building delete / insert / update queries in the desinger.

equivilant actions

using the Query Designer

You can achieve the equivilant actions in the GUI using the designer and or SQL commands.

using a macro

I want to filter my form based on the contents of a combobox?

Converting my VBA modules to Base modules

What happened to me?

There is no exact duplicate to the ME psuedo variable in VBA.

In Access VBA 'me' has attributes of two seperate objects in OOoBasic: TextDocument and DataForm

The TextDocument object would be used for controlling the window size and placement on the screen for instance.

The DataForm meanwhile supports result set functions, such as First, Filter, InsertRow.

In OOoBasic the psuedo variable thisComponent normaly would be the TextDocument, while thisComponent.DrawPage.Forms(0) meanwhile would reference the first DataForm owned by the TextDocument.

Perhaps a still closer equivilant is to use the object ownership hierarchy to get to the form. For example if we had a single table form with a button, then in the macro called by the 'onClick' or as OOBase calls it the 'When initializing' event we would do this: Create a macro in a library named onButtonClick( oEv as object )

   sub onButtonClick( oEv as object )
     ' oEv is the event object passed automatially
     ' it has a property SOURCE which is the 
     ' button that initiated this call
     dim oForm as variant
     oForm = oEv.Source.Model.Parent
      ' oForm is now the virtual form objct
     dim oDocument as variant
     oDocument = thisComponent
      ' oDocument is now the textDocument displayed in
      ' the window on screen
   end sub

Where is findfirst?

Base does not appear to have a FindFirst function on the rowset like MS Access, what is the equivilant Base function?

MSAccess VBA example:

Say there is a VB combo box which lists all the prospects in the database and allows the user to select a particular prospect and then have the form automatically go to that person's data record.

 Private Sub Find_Combo_AfterUpdate()
 Dim strCriteria As String
 strCriteria = "[Prospect_ID] =" & Me.Find_Combo
 Me.recordsetclone.FindFirst (strCriteria)
 If me.recordsetclone.NoMatch Then
     MsgBox "No entry found"
     Form_F_Prospects.Bookmark = me.recordsetclone.Bookmark
 End If
 End Sub

For this type of simple single column search it is easy enough to create our own find first equivilant with OOoBasic:

Sub Find_Combo_AfterUpdate( OEv as Object)
   ' Oev is the event object automatically sent
   ' to sub procedure call
   ' Oev will have a property Source
   ' that is the control that triggered
   ' the call to this procedure
 Dim oForm as variant ' The dataform obejct 
 Dim oComboBox as variant ' The combobox control
 Dim oBkMark as variant
 oForm = oEv.Source.Model.Parent
 oComboBox = oForm.getByName( "Find_Combo" )
 oBkMark = FindFirst( oForm.CreateResultSet(), "Prospect_ID", oComboBox.Text )
     ' oForm.CreateResultSet() is equivilant here to me.recordsetclone
 if not IsEmpty( oBkMark ) then
 		oForm.moveToBookmark( oBkMark )
 	msgBox( oComboBox.Text & " not found" )
 end if
end sub
function FindFirst( oRS as variant, ColName as string, SearchVal as string ) as variant
       ' oRS is a resultSet object
       ' ColName is the name of a column in the resultset
       ' SearchVal is
   dim colIDX as integer
   dim NotFound as variant
   FindFirst = notFound
   colIDX = oRS.FindColumn( ColName )
         if oRS.getString( colIDX ) <> Searchval
           if oRS.isAfterLast then
             exit do
           FindFirst = oRS.getBookMark
           exit do
         end if
   while oRS.isAfterLast <> True
end function

How do I set the filter for a sub-form only?

Is there an equivilant to DoCmd RunSQL

Yes, in OOoBase you would use either a Statement or PreparedStatement object to achieve the same function. With OOoBase you must also decide between using execute and executeUpdate.

For example if you had the VBA line

 DoCmd RunSQL( "SELECT * FROM tContacts" )

it would become in OOoBase

 Dim oStatement as variant
 oStatement = OForm.ActiveConnection.CreateStatement
   ' Where oForm is a DataForm object
   ' NOTE you could do exactly the same thing with
   ' a resultSet or rowSet obejct also
   ' oStatement = OResultSet.ActiveConnection.CreateStatement
 oStatement.execute( "SELECT * FROM ""tContacts"""  )

If on the other hand the VBA line where

 DoCmd RunSQL( "DELETE FROM tContacts WHERE Status = 'INACTIVE'" )

then we would use the executeUpdate method on a statement

 oStatement.executeUpdate( "DELETE FROM ""tContacts"" WHERE ""Status"" = 'INACTIVE'"  )

The rule is -

  • if your SQL statement will return records you use execute or executeQuery.
  • if the SQL statement returns no records then you must use executeUpdate.

If I use DLookup columns in MS Access what can I do in Base?

There are two parts to this answer, given that Base does not support DLookup column types in tables.

When a table is displayed in a custom form use of a bound listbox will give you the same functionality. An example of adding a listbox to a form and to a grid control on a form is at this page.

In a table view ( double clicking on the table name ) there is no equivilant to this.

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