Hi Shrivas,
no it not only the way you can use insert or modify command also from your ABAP code, But it is not the correct way to update the standard table .
the insert command is like that.
INSERT INTO dbtab VALUES wa.
or from int table
INSERT dbtab FROM TABLE itab.
for modify
MODIFY dbtab FROM wa.
or from int table
MODIFY dbtab FROM TABLE itab.
you can use either BDC or BAPI to update Customer Details.
Regrads,