如何在Cassandra中像'WHERE'一樣在SQL中搜索值？

你好的開發夥伴們，IA位卡在卡珊德拉查詢，即時試圖谷歌如何在卡桑德拉加限制/調節並得到了一些例子，所以我創建的方法是這樣的，我用赫克託客戶端API：如何在Cassandra中像'WHERE'一樣在SQL中搜索值？

IndexedSlicesQuery<String,String,String> indexedSlicesQuery=new IndexedSlicesQuery<String, String, String>(keyspace, serializer, serializer, serializers); 
    indexedSlicesQuery.addEqualsExpression(columnName, value); 
    indexedSlicesQuery.setReturnKeysOnly(); 
    indexedSlicesQuery.setColumnFamily(COLUMNFAMILY); 
    indexedSlicesQuery.setStartKey(""); 
    QueryResult<OrderedRows<String,String,String>> result=indexedSlicesQuery.execute(); 

    return result;

是正確的方法？是'WHERE'的方法是indexedSlicesQuery.addEqualsExpression(columnName, value);？

任何機構都可以幫助我嗎？我仍然嘗試了這一點，因爲我得到了一些錯誤是這樣的：

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)

IAM對不起我的新手問題，我不好english..thanks ..：d

UPDATE

好的，谷歌搜索和谷歌搜索後，我發現了一個基於這個解決方案Link，這個技術是創建index_type時創建一些列家庭，像這樣（基於該鏈接）：

[[email protected]] 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}];

後創建的索引列的家庭，可以在卡桑德拉 - cli..and llike ordinray SQL查詢我會嘗試在hector..thanks的關注..：d

來源

2011-05-30 fahmi

你可以在答案部分簡要地顯示你的搜索喜歡cassandra選項。它可能對所有人都有用。 – BobDroid 2012-04-02 05:21:11

您需要添加索引到您想要運行WHERE子句的列。

來源

2011-05-31 19:16:02 Zanson

你好Zanson，謝謝你的迴應，我一直在cassandra-cli嘗試和成功，但我在Hector發現問題..：D – fahmi 2011-06-01 04:18:05

如何在Cassandra中像'WHERE'一樣在SQL中搜索值？

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