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.
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 <email@example.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.getwith 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_CheersOn 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!
Software Engineer, DataStax
Maintainer of the pycassa Cassandra Python client library