Thanks for the quick responses guys. Yes, I did look at RowResult but its not very obvious what its supposed to do when dealing with a column family that consists of multiple qualifiers. Does each column family get a single key or does each qualifier get a single key in the entry set?
I'm sorry, I guess I could run a test and check what it does but I am physically away from my machine which has HBase installed so I can't verify this - so I resorted to the documentation which didn't seem too clear to me. Thanks again, Ishaaq stack-3 wrote: > > On Mon, Jul 6, 2009 at 6:39 PM, Ishaaq Chandy <[email protected]> wrote: > >> >> Hmm, I have a similar requirement. However, when looking at the API I >> cannot >> see these classes: Get and Result. Are these 0.20.0 classes? If so, what >> would be the equivalent for 0.19.3? > > > > Yes. These are 0.20.0 classes. > > In 0.19.3, use RowResult. Iterate entrySet: > http://hadoop.apache.org/hbase/docs/r0.19.3/api/org/apache/hadoop/hbase/io/RowResult.html#entrySet(). > Its keyed by column. > > St.Ack > > > Thanks, >> Ishaaq >> >> >> Jonathan Gray-2 wrote: >> > >> > Fleming, >> > >> > Of course there is! >> > >> > Look at some of the different methods in Result that return various >> Maps >> > in different format. For your example, you might do: >> > >> > ======= >> > >> > HTable table = new HTable("Table1"); >> > Get g = new Get(Bytes.toBytes("Key1")); >> > Result r = table.get(g); >> > >> > // Get a Map<qualifier,value> for Family >> > >> > Map<byte[],byte[]> family = r.getFamilyMap(Bytes.toBytes("Family")); >> > >> > // You can get a value knowing the qualifier >> > >> > byte [] value1 = family.get(Bytes.toBytes("qualifier1")); >> > >> > // Or you can just iterate all the qualifiers and values >> > >> > for(Map.Entry<byte[],byte[]> entry : family.entrySet()) { >> > byte [] qualifier = entry.getKey(); >> > byte [] value = entry.getValue(); >> > } >> > >> > ======= >> > >> > All the maps that are returned by Result are NavigableMaps, so they are >> > sorted and allow a number of operations on them. >> > >> > Hope that helps. >> > >> > JG >> > >> > [email protected] wrote: >> >> Hi there, >> >> >> >> I have a table "Table1" with one Family and 10 qualifier. >> >> Any ways that I can get these qualifier's name in Table1, >> >> then I can loop qualifier collection to fetch each qualifier's value. >> >> Thank you >> >> >> >> Fleming >> >> >> >> >> ==================================================================================== >> >> >> >> HTable table = new HTable(config, "Table1"); >> >> Get g = new Get(Bytes.toBytes("Key1")); >> >> Result r = table.get(g); >> >> byte [] value1 = r.getValue(Bytes.toBytes("Family"), >> >> Bytes.toBytes("qualifier1")); >> >> String valueStr1 = Bytes.toString(value1); >> >> byte [] value2 = r.getValue(Bytes.toBytes("Family"), >> >> Bytes.toBytes("qualifier2")); >> >> String valueStr2 = Bytes.toString(value2); >> >> . >> >> . >> >> . >> >> >> >> byte [] value10 = r.getValue(Bytes.toBytes("Family"), >> >> Bytes.toBytes("qualifier10")); >> >> String valueStr10 = Bytes.toString(value10); >> >> >> >> >> --------------------------------------------------------------------------- >> >> TSMC PROPERTY >> >> This email communication (and any attachments) is proprietary >> >> information >> >> for the sole use of its >> >> intended recipient. Any unauthorized review, use or distribution by >> >> anyone >> >> other than the intended >> >> recipient is strictly prohibited. If you are not the intended >> >> recipient, >> >> please notify the sender by >> >> replying to this email, and then delete this email and any copies of >> it >> >> immediately. Thank you. >> >> >> >> >> --------------------------------------------------------------------------- >> >> >> >> >> >> >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Try-to-get-qualifier-collection-tp24217280p24365806.html >> Sent from the HBase User mailing list archive at Nabble.com. >> >> > > -- View this message in context: http://www.nabble.com/Try-to-get-qualifier-collection-tp24217280p24366338.html Sent from the HBase User mailing list archive at Nabble.com.
