Examples of org.apache.cassandra.service.pager.QueryPager

Package org.apache.cassandra.service.pager

Examples of org.apache.cassandra.service.pager.QueryPager

org.apache.cassandra.service.pager.QueryPager
Perform a query, paging it by page of a given size. This is essentially an iterator of pages. Each call to fetchPage() will return the next page (i.e. the next list of rows) and isExhausted() indicates whether there is more page to fetch. The pageSize will either be in term of cells or in term of CQL3 row, depending on the parameters of the command we page. Please note that the pager might page within rows, so there is no guarantee that successive pages won't return the same row (though with different columns every time). Also, there is no guarantee that fetchPage() won't return an empty list, even if isExhausted() return false (but it is guaranteed to return an empty list *if* isExhausted() return true). Indeed, isExhausted() does *not trigger a query so in some (failry rare) case we might not know the paging is done even though it is.

            ParsedStatement.Prepared prepared = prepareInternal(query);
            if (!(prepared.statement instanceof SelectStatement))
                throw new IllegalArgumentException("Only SELECTs can be paged");


            SelectStatement select = (SelectStatement)prepared.statement;
            QueryPager pager = QueryPagers.localPager(select.getPageableCommand(makeInternalOptions(prepared, values)));
            return UntypedResultSet.create(select, pager, pageSize);
        }
        catch (RequestValidationException e)
        {
            throw new RuntimeException("Error validating query" + e);

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            ParsedStatement.Prepared prepared = prepareInternal(query);
            if (!(prepared.statement instanceof SelectStatement))
                throw new IllegalArgumentException("Only SELECTs can be paged");


            SelectStatement select = (SelectStatement)prepared.statement;
            QueryPager pager = QueryPagers.localPager(select.getPageableCommand(makeInternalOptions(prepared, values)));
            return UntypedResultSet.create(select, pager, pageSize);
        }
        catch (RequestValidationException e)
        {
            throw new RuntimeException("Error validating query" + e);

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            ParsedStatement.Prepared prepared = prepareInternal(query);
            if (!(prepared.statement instanceof SelectStatement))
                throw new IllegalArgumentException("Only SELECTs can be paged");


            SelectStatement select = (SelectStatement)prepared.statement;
            QueryPager pager = QueryPagers.localPager(select.getPageableCommand(makeInternalOptions(prepared, values)));
            return UntypedResultSet.create(select, pager, pageSize);
        }
        catch (RequestValidationException e)
        {
            throw new RuntimeException("Error validating query" + e);

View Full Code Here

            ParsedStatement.Prepared prepared = prepareInternal(query);
            if (!(prepared.statement instanceof SelectStatement))
                throw new IllegalArgumentException("Only SELECTs can be paged");


            SelectStatement select = (SelectStatement)prepared.statement;
            QueryPager pager = QueryPagers.localPager(select.getPageableCommand(makeInternalOptions(prepared, values)));
            return UntypedResultSet.create(select, pager, pageSize);
        }
        catch (RequestValidationException e)
        {
            throw new RuntimeException("Error validating query" + e);

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Related Classes of org.apache.cassandra.service.pager.QueryPager

org.apache.cassandra.cql3.QueryProcessor

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