query_example.py

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# Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
 
import ROOT
 
colsvc = ROOT.pool.CollectionService()
read_only_flag = True
col=colsvc.handle('SimplePoolCollection1', 'RootCollection', '', read_only_flag)
 
des = col.description()
for c in range(0, des.numberOfAttributeColumns()):
    print "Attribute: ", des.attributeColumn(c, 0).name(), " type:", des.attributeColumn(c, 0).type()
for c in range(0, des.numberOfTokenColumns()):
    print "Reference: ", des.tokenColumn(c, 0).name()
 
query = col.newQuery()
 
#query.selectAll();
#query.addToOutputList( des.attributeColumn(0, 0).name() )
#query.addToOutputList( des.attributeColumn(1, 0).name() )
 
cursor = query.execute()
 
while( cursor.next() ):
    row = cursor.currentRow()
    tlist = row.tokenList()
    print tlist.size()
    print tlist[0].key()
 
    #  this crashes python  ???  MN
    #alist = row.attributeList()
    #print alist[0].data()
    #print "Attributes ", alist.size()
 
col.close()