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.

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


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

View Full Code Here


        // 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;

View Full Code Here

            return(ROWUTIL_FETCH_DESCRIPTOR_CONSTANTS[single_column_number]);
        }
        else
        {
            return(
                new FetchDescriptor(
                    single_column_number, single_column_number));
        }
    }

View Full Code Here

        // 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,

View Full Code Here


                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

View Full Code Here

                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];

View Full Code Here

        // 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));
  }

View Full Code Here


                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

View Full Code Here

            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(
                this.getConglomerate(), leaf, slot, lock_fetch_desc,template,

View Full Code Here

                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];

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

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

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.