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# XML-database conversion
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import re
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from xml.dom import Node
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import sql
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import strings
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import util
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import xml_dom
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def name_of(node): return re.sub(r'^.*\.', r'', node.tagName)
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ptr_suffix = '_id'
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def is_ptr(node_name): return node_name.lower().endswith(ptr_suffix)
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def ptr_type_guess(node_name):
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assert is_ptr(node_name)
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return node_name[:-len(ptr_suffix)]
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def ptr_target(node):
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assert is_ptr(name_of(node))
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return xml_dom.first_elem(node)
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def find_by_name(node, name):
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for parent in xml_dom.NodeParentIter(node):
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if name_of(parent) == name: return parent
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else:
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for child in xml_dom.NodeElemIter(parent):
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child_name = name_of(child)
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if is_ptr(child_name):
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target = ptr_target(child)
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if target.tagName == name: return target
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elif child_name == name: return child
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return None
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def get(db, node, pkeys=None, limit=None):
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if pkeys == None: pkeys = {}
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def pkey(table): return sql.pkey(db, pkeys, table)
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node = node.firstChild
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table = name_of(node)
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pkey_ = pkey(table)
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fields = []
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conds = {}
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for child in xml_dom.NodeElemIter(node):
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child_name = name_of(child)
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if xml_dom.is_empty(child): fields.append(child_name)
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elif xml_dom.is_text(child): conds[child_name] = xml_dom.value(child)
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else: raise Exception('Joins not supported yet')
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id_ = xml_dom.get_id(node)
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if id_ != '': conds[pkey(table)] = id_ # replace any existing pkey value
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if fields == []: fields.append(pkey_)
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return sql.select(db, table, fields, conds, limit)
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def put(db, node, store_ids=False, row_ct_ref=None, pkeys=None, parent_id=None):
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'''store_ids enables searching the tree for missing fields'''
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if pkeys == None: pkeys = {}
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def pkey(table): return sql.pkey(db, pkeys, table)
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table = name_of(node)
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pkey_ = pkey(table)
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row = {}
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children = []
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# Divide children into fields and children with fkeys to parent
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for child in xml_dom.NodeElemIter(node):
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child_name = name_of(child)
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if xml_dom.is_text(child):
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row[child_name] = strings.to_unicode(xml_dom.value(child))
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elif is_ptr(child_name): row[child_name] = put(db, ptr_target(child),
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store_ids, row_ct_ref, pkeys)
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else: children.append(child)
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try: del row[pkey_]
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except KeyError: pass
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# Add fkey to parent
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if parent_id != None:
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parent_ptr = node.getAttribute('fkey')
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if parent_ptr == '': parent_ptr = pkey(name_of(node.parentNode))
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row[parent_ptr] = parent_id
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# Insert node
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for try_num in xrange(2):
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try:
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id_ = sql.get(db, table, row, pkey_, True, row_ct_ref)
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if store_ids: xml_dom.set_id(node, id_)
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break
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except sql.NullValueException, ex:
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if try_num > 0: raise # exception still raised after retry
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if store_ids and is_ptr(ex.col):
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# Search for required column in ancestors and their children
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target = find_by_name(node, ptr_type_guess(ex.col))
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if target == None: raise
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row[ex.col] = xml_dom.get_id(target)
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else: raise
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# Insert children with fkeys to parent
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for child in children: put(db, child, store_ids, row_ct_ref, pkeys, id_)
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return id_
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def xml2db(db, node, row_ct_ref=None):
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iter_ = xml_dom.NodeElemIter(node)
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util.skip(iter_, xml_dom.is_text) # skip metadata
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for child in iter_: put(db, child, False, row_ct_ref)
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