Examples of org.apache.derby.iapi.store.access.ScanController.fetchNext()

Package org.apache.derby.iapi.store.access

Class org.apache.derby.iapi.store.access.ScanController

Examples of org.apache.derby.iapi.store.access.ScanController.fetchNext()

org.apache.derby.iapi.store.access.ScanController.fetchNext()
Fetch the (partial) row at the next position of the Scan. If there is a valid next position in the scan then the value in the destRow storable row is replaced with the value of the row at the current scan position. The columns of the destRow row must be of the same type as the actual columns in the underlying conglomerate. The resulting contents of destRow after a fetchNext() which returns false is undefined. The result of calling fetchNext(row) is exactly logically equivalent to making a next() call followed by a fetch(row) call. This interface allows implementations to optimize the 2 calls if possible. @param destRow The destRow row into which the valueof the next position in the scan is to be stored. @return True if there is a next position in the scan,false if there isn't. @exception StandardException Standard exception policy. @see ScanController#fetch @see RowUtil


        // it is important for read uncommitted scans to use fetchNext() rather
        // than fetch, so that the fetch happens while latch is held, otherwise
        // the next() might position the scan on a row, but the subsequent
        // fetch() may find the row deleted or purged from the table.
    while(scanController.fetchNext(outRow.getRowArray()))
    {
      TableDescriptor td = (TableDescriptor)
        rf.buildDescriptor(outRow, (TupleDescriptor)null,
                   this);
      ht.put(td.getUUID(), td);

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            ScanController.GE,      // startSearchOperation
      null,
      null,   // stop position - through last row
            ScanController.GT);     // stopSearchOperation


    while (scanController.fetchNext(outRow.getRowArray()))
        {
      DependencyDescriptor    dependencyDescriptor;


      dependencyDescriptor = (DependencyDescriptor)
             rf.buildDescriptor(outRow,

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        ScanController.GT);     // stopSearchOperation


        /* OK to fetch into the template row, 
         * since we won't be doing a next.
         */
    if (scanController.fetchNext(indexTemplateRow.getRowArray()))
    {
      RowLocation  baseRowLocation;




      baseRowLocation = (RowLocation)  indexTemplateRow.getColumn(

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        0,              // startSearchOperation - none
        scanQualifiers,     // scanQualifier,
        (DataValueDescriptor[]) null,    // stop position - through last row
        0);             // stopSearchOperation - none


    while (scanController.fetchNext(outRow.getRowArray()))
    {
      td = rf.buildDescriptor(outRow, parentTupleDescriptor, this);


      /* If dList is null, then caller only wants a single descriptor - we're done
       * else just add the current descriptor to the list.

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        {
          baseRowIndexOrder[i] = baseObjectArray[baseColumnPositions[i] - 1];
        }
      
        /* Get the index rows and count them */
        for (indexRows = 0; scan.fetchNext(indexRow.getRowArray()); indexRows++)
        {
          /*
          ** Get the base row using the RowLocation in the index row,
          ** which is in the last column.  
          */

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                false,
        TransactionController.OPENMODE_FORUPDATE,
        TransactionController.MODE_TABLE,
        TransactionController.ISOLATION_REPEATABLE_READ);


    while ( heapScan.fetchNext(heapRow.getRowArray()) )
        {
       heapScan.fetchLocation( heapLocation );


      indexRowGenerator.getIndexRow( heapRow, heapLocation, indexableRow, (FormatableBitSet) null );

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                ScanController.NA,
                (Qualifier[][]) null,
                (DataValueDescriptor[]) null,
                ScanController.NA);


    while (sc.fetchNext((DataValueDescriptor[]) null))
    {
      /* Replace the column in the table */
      sc.replace(replaceRow, columnToUpdateSet);
    }

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        (DataValueDescriptor[]) null, // stop position -through last row
        0);                   // stopSearchOperation - none


    try
    {
      while (scanController.fetchNext(outRow.getRowArray()))
      {
        SubConstraintDescriptor subCD = null;
  
        switch (rf.getConstraintType(outRow))
        {

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          ScanController.GE,         // startSearchOperation
          null,               // scanQualifier (none)
          keyRow.getRowArray(),      // stop position - exact key match.
          ScanController.GT);        // stopSearchOperation


      while (scanController.fetchNext(indexRow1.getRowArray()))
      {  
        baseRowLocation = (RowLocation)  
                    indexRow1.getColumn(indexRow1.nColumns());
  
        // get the row and grab the uuid

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        // it is important for read uncommitted scans to use fetchNext() rather
        // than fetch, so that the fetch happens while latch is held, otherwise
        // the next() might position the scan on a row, but the subsequent
        // fetch() may find the row deleted or purged from the table.
    while (scanController.fetchNext(outRow.getRowArray()))
    {
      cd = (ConglomerateDescriptor) rf.buildDescriptor(
                        outRow,
                        (TupleDescriptor) null,
                        this );

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