Examples of org.apache.derby.iapi.store.raw.FetchDescriptor

org.apache.derby.iapi.store.raw.FetchDescriptor
FetchDescriptor is used to package up all the arguments necessary to describe what rows and what row parts should be returned from the store back to language as part of a fetch.
The FetchDescriptor may also contain scratch space used to process the qualifiers passed in the scan. This scratch space will be used to cache information about the qualifiers, valid column list, row size so that calculations need only be done once per scan rather than every iteration.

                rowToInsert,
                SearchParameters.POSITION_LEFT_OF_PARTIAL_KEY_MATCH,
                scratch_template, this, false);


        // RowLocation column is in last column of template.
        FetchDescriptor lock_fetch_desc = 
            RowUtil.getFetchDescriptorConstant(
                scratch_template.length - 1);
        RowLocation lock_row_loc = 
            (RowLocation) scratch_template[scratch_template.length - 1];

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                (init_lock_fetch_desc.getValidColumnsArray())[init_template.length - 1] == 1); 
        }


        // note that we don't process qualifiers in btree fetch's
        this.init_fetchDesc             = 
            new FetchDescriptor(
                init_template.length, init_scanColumnList,(Qualifier[][]) null);


        initScanParams( 
            startKeyValue, startSearchOperator, 
            qualifier, stopKeyValue, stopSearchOperator);

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        }


        try {
            DataValueDescriptor[] fullKey = scan_position.getKeyTemplate();


            FetchDescriptor fetchDescriptor = null;
            boolean haveAllColumns = false;
            if (partialKey != null) {
                int copiedCols = 0;
                final int partialKeyLength =
                        (vcols == null) ? partialKey.length : vcols.length;

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                Page page   = leaf.page;




                // RowLocation column is in last column of template.
                FetchDescriptor lock_fetch_desc = 
                    RowUtil.getFetchDescriptorConstant(
                        scratch_template.length - 1);


                // loop backward so that purges which affect the slot table 
                // don't affect the loop (ie. they only move records we

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            if (!originalRow [i].equals(newRow [i]))
                return NO_MATCH;
        }
        //It might be a deleted record try getting a lock on it
        DataValueDescriptor[] template = runtime_mem.get_template(getRawTran());
        FetchDescriptor lock_fetch_desc = RowUtil.getFetchDescriptorConstant(
                                                    template.length - 1);
        RowLocation lock_row_loc = 
            (RowLocation) scratch_template[scratch_template.length - 1];
        boolean latch_released = !getLockingPolicy().lockNonScanRowOnPage(
                leaf, slot, lock_fetch_desc, template,

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                rowToInsert,
                SearchParameters.POSITION_LEFT_OF_PARTIAL_KEY_MATCH,
                scratch_template, this, false);


        // RowLocation column is in last column of template.
        FetchDescriptor lock_fetch_desc = 
            RowUtil.getFetchDescriptorConstant(
                scratch_template.length - 1);
        RowLocation lock_row_loc = 
            (RowLocation) scratch_template[scratch_template.length - 1];

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    {
        this.scratch_row = 
            new DataValueDescriptor[getNumberOfControlRowColumns()];


        this.fetchDesc   = 
            new FetchDescriptor(
                this.scratch_row.length, (FormatableBitSet) null, (Qualifier[][]) null);
    }

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        // TODO (mikem) - get rid of this new.


        page.fetchFromSlot(
           (RecordHandle) null, CR_SLOT, version_ret,
           new FetchDescriptor(1, CR_VERSION_BITSET, (Qualifier[][]) null), 
           false); 


        // use format id to create empty instance of right Conglomerate class
        cr = (ControlRow) Monitor.newInstanceFromIdentifier(version.getValue());
        cr.page = page;

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            Page page   = leaf.page;




            // RowLocation column is in last column of template.
            FetchDescriptor lock_fetch_desc = 
                RowUtil.getFetchDescriptorConstant(
                    scratch_template.length - 1);


            // loop backward so that purges which affect the slot table 
            // don't affect the loop (ie. they only move records we

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        // TODO (mikem) - this could be more efficient, by writing
        // code to figure out length of row, but scratch row is cached
        // so allocating it here is probably not that bad.
        init_fetchDesc = 
            new FetchDescriptor(
              (open_conglom.getRuntimeMem().get_scratch_row()).length,
              init_scanColumnList,
              init_qualifier);


        // stopKeyValue init.

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Related Classes of org.apache.derby.iapi.store.raw.FetchDescriptor

org.apache.derby.iapi.store.access.RowUtil

org.apache.derby.impl.store.access.btree.BTreeController

org.apache.derby.impl.store.access.btree.BTreeMaxScan

org.apache.derby.impl.store.access.btree.BTreePostCommit

org.apache.derby.impl.store.access.btree.BTreeRowPosition

org.apache.derby.impl.store.access.btree.BTreeScan

org.apache.derby.impl.store.access.btree.ControlRow

org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController

org.apache.derby.impl.store.access.conglomerate.GenericScanController

org.apache.derby.impl.store.raw.data.BasePage

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