Examples of org.xorm.datastore.Row

org.xorm.datastore.Row
A row represents a single instance of a data object. The structure of a Row is defined by its reference to a Table. The terms Row and Table could be changed to "Data Object" and "Datatype"; they were chosen to correspond to a relational database notion but are in no way tied to any particular implementation. A Row contains only primitive values; that is, there are no references to first class objects. When used with a relational database, an instance of the Row class is meant to correspond exactly with a single row in a database table. Foreign keys and primary keys are typically expressed as numeric IDs. Each instance of a Row tracks values for each Column specified for a Table. The column values may or may not have been loaded from persistent storage. This can be tested for using the containsValue() method. If the value has been set -- even to null -- containsValue() will return "true". A row also tracks dirty bits for each Column. A value is said to be dirty if it has been changed since the first time it was set. DatastoreDriver implementations are encouraged to use this information to optimize the update() operation. Finally, a Row is said to be "hollow" if no values other than the primary key have been set. Because it is possible to have a Table without a primary key (for example, a many-to-many table in a relational database), the getPrimaryKeyValue() method is not guaranteed to return a value.


            ResultSet rs = ps.executeQuery();
            Set aliases = query.getAliases();
      
            while (rs.next()) {
                Row row;
                Set columns;
                SQLQuery.Alias alias;
                Table table;


                pos = 0;
                Iterator i = aliases.iterator();
                while (i.hasNext()) {
                    alias = (SQLQuery.Alias) i.next();
                    table = alias.getTable();
                    Set fcs = alias.getFetchColumns();
                    if (!fcs.isEmpty()) {
                        row = new Row(table);
                        Iterator fci = fcs.iterator();
                        while (fci.hasNext()) {
                            Column c = (Column) fci.next();
        
                            // TODO will this be flexible enough?
                            row.setValue(c, rs.getObject(++pos));
                        }
                        if (table.equals(query.getTargetTable())) {
                            list.add(row);
                        } else {
                            extraRows.add(row);

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   */
  public Object getCacheKey(Object value) {
    if(value == null) {
      return null;
    } else {
      Row row = (Row)value;
      return makeRowPrimaryKey(row.getTable(), row);
    }
  }

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        if (!txnManaged) {
            forceTransaction();
        }


        InterfaceInvocationHandler handler = InterfaceInvocationHandler.getHandler(o);
        Row row = new Row(mapping.getSource().getColumn().getTable());
        row.setValue(mapping.getSource().getColumn(), owner.getObjectId());
        row.setValue(mapping.getTarget().getColumn(), handler.getObjectId());
        getRows().add(row);
        if (!owner.isDirty()) {
            owner.makeDirty();
        }
        rowToProxy.put(row, o);

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        Object targetKey = handler.getObjectId();
  
        // Find the row that matches the targetKey
        Iterator i = getRows().iterator();
        while (i.hasNext()) {
            Row row = (Row) i.next();
            if (targetKey.equals(row.getValue(mapping.getTarget().getColumn()))) {
                if (mapping.isMToN()) {
                    markAsDeleted(row);
                }
                i.remove();
                rowToProxy.remove(row);

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            if (!owner.isDirty()) {
                owner.makeDirty();
            }


            while (i.hasNext()) {
                Row row = (Row) i.next();
                if (mapping.isMToN()) {
                    markAsDeleted(row);
                }
                i.remove();
            }

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        // Go through Rows and look for references to oldID
        Iterator i = getRows().iterator();
        Column c1 = mapping.getTarget().getColumn();
        Column c2 = mapping.getSource().getColumn();
        while (i.hasNext()) {
            Row row = (Row) i.next();
            if (oldID.equals(row.getValue(c1))) {
                row.setValue(c1, newID);
            }
            if (oldID.equals(row.getValue(c2))) {
                row.setValue(c2, newID);
            }
        }
        // TODO do we need to tell all contained items?
    }

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  if (!txnManaged) {
      forceTransaction();
  }


  InterfaceInvocationHandler handler = InterfaceInvocationHandler.getHandler(o);
  Row row;
  if (mapping.isMToN()) {
      row = new Row(mapping.getSource().getColumn().getTable());
      row.setValue(mapping.getTarget().getColumn(), handler.getObjectId());
      markAsNew(row);
  } else {
      row = handler.getRow();
  }
  row.setValue(mapping.getSource().getColumn(), owner.getObjectId());
  row.setValue(mapping.getIndexColumn(), new Integer(index));


  ((List) getRows()).add(index, row);
  rowToProxy.put(row, o);


  // TODO: alter indices of all elements > index

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    }


    protected void reindex(int start, int offset) {
  ListIterator li = ((List) getRows()).listIterator(start);
  while (li.hasNext()) {
      Row row = (Row) li.next();
      int oldIndex = ((Integer) row.getValue(mapping.getIndexColumn()))
    .intValue();
      row.setValue(mapping.getIndexColumn(), new Integer(oldIndex + offset));
      // Mark the row for an update?
  }
    }

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      if (!getElementType().isInstance(o)) {
    throw new IllegalArgumentException("Collection only accepts " + getElementType());
      }


      InterfaceInvocationHandler handler = InterfaceInvocationHandler.getHandler(o);
      Row row = new Row(mapping.getSource().getColumn().getTable());
      row.setValue(mapping.getSource().getColumn(), owner.getObjectId());
      row.setValue(mapping.getTarget().getColumn(), handler.getObjectId());
      // TODO: set index value to current++


      rowToProxy.put(row, o);
      if (mapping.isMToN()) {
    markAsNew(row);

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  // TODO: Now update all indices of rows starting at current
  return true;
    }


    public Object get(int index) {
  Row row = (Row) ((List) getRows()).get(index);
  Object o = null;
  if (rowToProxy.containsKey(row)) {
      o = rowToProxy.get(row);
  } else {
      Object key = row.getValue(getKeyColumn());
      o = mgr.lookup(getElementType(), key);
      rowToProxy.put(row, o);
  }
  return o;
    }

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