//look for foreign key dependency on the column.
constraintDescriptorList = dd.getConstraintDescriptors(td);
for(int index=0; index<constraintDescriptorList.size(); index++)
{
constraintDescriptor = constraintDescriptorList.elementAt(index);
int[] referencedColumns = constraintDescriptor.getReferencedColumns();
int numRefCols = referencedColumns.length;
for (int j = 0; j < numRefCols; j++)
{
if ((referencedColumns[j] == columnPosition) &&