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.

        // need to allocate row with fieldId cols because of sparse row change
        // needs to be RESOLVED
    Object[] row = new Object[fieldId + 1];
    row[fieldId] = column;


    FetchDescriptor fetchDesc = 
      new FetchDescriptor(fieldId + 1, fieldId);


    return(fetchFromSlot(null, slot, row, fetchDesc, true));
  }

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        StoredRecordHeader recordHeader = getHeaderAtSlot(slot);


    if (recordHeader.isDeleted())
      return null;


        FetchDescriptor hack_fetch = 
            new FetchDescriptor(
                    row.length, validColumns, (Qualifier[][]) null);


    // magic to copy rows across ...
    restoreRecordFromSlot(
            slot, row, hack_fetch, handle, recordHeader, true);

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    row[fieldId] = column;
    FormatableBitSet singleColumn = new FormatableBitSet(fieldId + 1);


    singleColumn.set(fieldId);


        FetchDescriptor fetchDesc = 
            new FetchDescriptor(fieldId + 1, singleColumn,(Qualifier[][]) null);


    return(fetchFromSlot(null, slot, row, fetchDesc, true));
  }

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        // RESOLVE (mikem) - get rid of new here.
        boolean ret_val = 
            (pos.current_page.fetchFromSlot(
                pos.current_rh, pos.current_slot, 
                row, 
                new FetchDescriptor(
                    row.length, validColumns, (Qualifier[][]) null), 
                false) != null);


        // RESOLVE (mikem) - should be some way to hide this in the unlock call,
        // and just always make the unlock call.

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        // RESOLVE (mikem) - get rid of new here.
        boolean ret_val = 
            (pos.current_page.fetchFromSlot(
                pos.current_rh, pos.current_slot, 
                row, 
                new FetchDescriptor(
                    row.length, validColumns, (Qualifier[][]) null), 
                false) != null);


        // RESOLVE (mikem) - should be some way to hide this in the unlock call,
        // and just always make the unlock call.

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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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        // 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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                (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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        // we need to scan until we hit the end of the table or until we
        // run into a null.  Use this template to probe the "next" row so
        // that if we need to finish, fetch_row will have the right value.
        DataValueDescriptor[] check_row_template = new DataValueDescriptor[1];
        check_row_template[0] = fetch_row[0].getClone();
        FetchDescriptor check_row_desc = RowUtil.getFetchDescriptorConstant(1);


        // reopen the scan for reading from the beginning of the table.
        reopenScan(
            (DataValueDescriptor[]) null,
            ScanController.NA,

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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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