how to do .import with revdb_execute (sqlite)?

[Viktoras Didziulis]

revdb_execute(dbID,".import '" & myFile & "' 'Lookup'") throws an error:
near "." syntax error. Same command works from shell with external sqlite
installation or from commandline. Is there any other way to import tab
delimited file into database table directly through revdb_execute ? Are
there any alternative recipes? SQL INSERTs are so much slower, therefore I
would prefer .import... 
 
Thanks in advance! 
Viktoras