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POHow to Search Value in Cassandra like 'WHERE' in SQL?
 

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  1. POHow to Search Value in Cassandra like 'WHERE' in SQL?
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    <p>Hello fellow developers,i a bit stuck in querying in cassandra,im trying to google how to add restriction/conditioning in cassandra and got some example,so i create method like this,i using Hector for client API:</p> <pre><code> IndexedSlicesQuery&lt;String,String,String&gt; indexedSlicesQuery=new IndexedSlicesQuery&lt;String, String, String&gt;(keyspace, serializer, serializer, serializers); indexedSlicesQuery.addEqualsExpression(columnName, value); indexedSlicesQuery.setReturnKeysOnly(); indexedSlicesQuery.setColumnFamily(COLUMNFAMILY); indexedSlicesQuery.setStartKey(""); QueryResult&lt;OrderedRows&lt;String,String,String&gt;&gt; result=indexedSlicesQuery.execute(); return result; </code></pre> <p>is the method right? is the 'WHERE' like method is <code>indexedSlicesQuery.addEqualsExpression(columnName, value);</code>?</p> <p>any body can help me? i still try this out,because i got some error like this :</p> <pre><code>1296 [main] INFO me.prettyprint.cassandra.hector.TimingLogger - start[1306744089788] time[158] tag[READ.fail_] Exception in thread "main" me.prettyprint.hector.api.exceptions.HInvalidRequestException: InvalidRequestException(why:No indexed columns present in index clause with operator EQ) at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:42) at me.prettyprint.cassandra.service.KeyspaceServiceImpl$12.execute(KeyspaceServiceImpl.java:513) at me.prettyprint.cassandra.service.KeyspaceServiceImpl$12.execute(KeyspaceServiceImpl.java:495) at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:101) at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:221) at me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:129) at me.prettyprint.cassandra.service.KeyspaceServiceImpl.getIndexedSlices(KeyspaceServiceImpl.java:517) at me.prettyprint.cassandra.model.IndexedSlicesQuery$1.doInKeyspace(IndexedSlicesQuery.java:140) at me.prettyprint.cassandra.model.IndexedSlicesQuery$1.doInKeyspace(IndexedSlicesQuery.java:131) at me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20) at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85) at me.prettyprint.cassandra.model.IndexedSlicesQuery.execute(IndexedSlicesQuery.java:130) </code></pre> <p>iam sorry for my newbie question and my bad english..thanks..:D</p> <p><strong>UPDATE</strong></p> <p>OK,After Googling and googling,i found a solutions based on this <a href="http://www.datastax.com/docs/0.7/data_model/secondary_indexes" rel="nofollow">Link</a>, this technic is to create index_type when create some column family,like this (based on that link):</p> <pre><code>[default@demo] create column family users with comparator=UTF8Type ... and column_metadata=[{column_name: full_name, validation_class: UTF8Type}, ... {column_name: state, validation_class: UTF8Type}, ... {column_name: birth_date, validation_class: LongType, index_type: KEYS}]; </code></pre> <p>after create that indexed column family,you can query llike ordinray sql in cassandra-cli..and i would try that in hector..thanks for your attention..:D</p>
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      1. POHow to Search Value in Cassandra like 'WHERE' in SQL?
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    1. COcan u briefly show your search like option for cassandra in answer section. It may be useful for all.
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      1. USBobDroid
 

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