I believe you can set start to be "ABC_" and finish to be "ABC_\0000" (for UTF8) to get everything that contains exactly ABC_ and set finish to "ABC_\FFFF" to get everything that starts with ABC_. You probably want to do a simple string comparison test to verify.
On Tue, Aug 2, 2011 at 6:50 PM, Tyler Hobbs <ty...@datastax.com> wrote: > A minor correction: > > To get all columns starting with "ABC_", you would set column_start="ABC_" > and column_finish="ABC`" (the '`' character comes after '_'), and ignore the > last column in your results if it happened to be "ABC`". > > column_finish, or the "slice end" in other clients, is inclusive. You > could of course use "ABC_~" as column_finish and avoid the check if you know > that you don't have column names like "ABC_~FOO" that you want to include. > > On Tue, Aug 2, 2011 at 7:17 PM, aaron morton <aa...@thelastpickle.com>wrote: > >> Yup, thats a pretty common pattern. How exactly depends on the client you >> are using. >> >> Say you were using pycassam, you would do a get() >> http://pycassa.github.com/pycassa/api/pycassa/columnfamily.html#pycassa.columnfamily.ColumnFamily.get >> >> with column_start="ABC_" , count to whatever, and column_finish not >> provided. >> >> You can also provide a finish and use the highest encoded character, e.g. >> ascii 126 is ~ so if you used column_finish = "ABC_~" you would get >> everything that starts with ABC_ >> >> Cheers >> >> ----------------- >> Aaron Morton >> Freelance Cassandra Developer >> @aaronmorton >> http://www.thelastpickle.com >> >> On 3 Aug 2011, at 09:28, Eldad Yamin wrote: >> >> Hello, >> I wonder if I can select a column or all columns that start with X. >> E.g I have columns ABC_1, ABC_2, ZZZ_1 and I want to select all columns >> that start with ABC_ - is that possible? >> >> >> >> Thanks! >> >> >> > > > -- > Tyler Hobbs > Software Engineer, DataStax <http://datastax.com/> > Maintainer of the pycassa <http://github.com/pycassa/pycassa> Cassandra > Python client library > >
