>
>
> Connection conn = DriverManager.getConnection
> ("jdbc:firebirdsql:localhost/3050:" + database + "?user=" + user
> + "&password=" + password
> + "&useUnicode=true&characterEncoding=WIN1254");

a) useUnicode=true does not have any meaning for Firebird. Where did you
find this property?

b) characterEncoding=WIN1254 should be replaced with encoding=WIN1254.
Where did you find the characterEncoding property?

> I use this code to connect FireBird! But still it gives same
> exception when i insert a record that includes Turkish caracters.
> Where is my mistake ?

List of properties that can be used with JayBird JDBC driver can be found
in Release Notes.

Roman