Using Firebird with Xojo
Posted by Paul Lefebvre
Firebird is a completely free (cost and license), cross-platform database with some interesting features.
Although Xojo does not have a native plugin for connecting to Firebird, you can use the ODBC plugin in conjunction with the Firebird ODBC drivers to use Firebird with Xojo.
Firebird can be used two ways, as a database server or as an embedded database.
Connect to the Server
Once you download and install Firebird (which took me about a minute using the default settings), you can then get the ODBC drivers, which have to be downloaded separately. Note, there are only ODBC drivers available for Windows and Linux.
After installing the ODBC drivers, you can go to the ODBC Control Panel and add a data source by selecting the Firebird/Interbase driver from the list.
For the DSN name, I used "FirebirdServerTest".
I used this value for the Database property: 10.0.1.16:C:\Program Files\Firebird\Firebird_2_5\examples\empbuild\employee.fdb
Use "SYSDBA" for the Database Account and "masterkey" as the password. You don't need to change any other settings.
Use the "Test connection" button in the window to verify that you can connect.
Connect Directly to a Database File
If you did not already install the ODBC drivers from above, you will need to do so now. After installing the ODBC drivers, you can go to the ODBC Control Panel and add a data source by selecting the Firebird/Interbase driver from the list.
For the DSN name, I used "FirebirdembeddedTest".
Firebird includes a sample database, which was located here on my Windows installation: C:\Program Files\Firebird\Firebird_2_5\examples\empbuild
I copied this file to the Desktop. Use "SYSDBA" for the Database Account and "masterkey" as the password. Click the "Test Connection" button to verify that everything is correct. If so, you are now ready to connect using Xojo.
Connecting Using Xojo
Now that you have created your ODBC DSN entries, you can use this with the Xojo ODBC plugin to connect to the database. The code to do this is similar to most Xojo database code. I'm going to have a single method that is used to connect using the specified DSN. This method is called ConnectToFirebird(dsn As String):
Dim db As New ODBCDatabase
db.DataSource = dsn
If db.Connect Then
Dim sql As String = "SELECT emp_no, full_name, job_code, job_country FROM employee;" Dim rs As RecordSet
rs = db.SQLSelect(sql)
If rs <> Nil And Not db.Error Then
While Not rs.EOF
End IfEnd If
This method connects to the sample database and adds all the names in the employee table to a ListBox. You can call this method and supply the name of the DSN to use to connect.
Add a button to test the embedded connection and add this code to its Action event handler:
Now add a button to test the server connection and add this code to its Action event handler:
Run the app and click the buttons to see the ListBox get populated.
Now that you know how to use Firebird, you can spend some time with its documentation to learn more about it.