sql - Python manual query building: how to escape strings for MySQL in list comprehension where clause builder? -

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i'm using django site, can't use django's orm because it's not built "n" databases dynamically selected user joins between multiple databases, otherwise trust me love to.

i'm stuck building query hand , take @ trickery list comprehension: 

  def buildquery(self, pagedata, num_per_page) :      given_fields = {k:v k,v in self.entity.fields.items() if k in pagedata.iterkeys()}         where_clauses = [(given_fields[k] % pagedata) k in given_fields if pagedata[k].strip() != '']      if where_clauses:        self.queryparts['whereclause'] = 'where ' + ' , '.join(where_clauses)     else:       self.queryparts['whereclause'] = ''      if pagedata.get('sort_by', '1') != '':       self.queryparts['sortby'] = 'order %s %s' % (pagedata.get('sort_by','1'), pagedata.get('sort_dir','asc'))      else:        self.queryparts['sortby'] = ''      self.queryparts ['limit'] = 'limit ' + self.buildlimit(pagedata.get('page',1), num_per_page)     return self.entity.query % self.queryparts

what above take intersection of fields page , class fields. sample "entity" looks this: 

  class event:     fields = {'keyword': "(rmt.title '%(keyword)s' or rmt.episode_name '%(keyword)s') ",                'service_name': "(s.short_name '%(service_name)s' or rch.aliases '%(service_name)s')",                'puid': "ime.program_unique_id '%(puid)s%%'",               'ims_theme': "",               'content_type': "rmt.types in ('%(content_type)s')",               'genre': "rmt.genres ('%(genre)s')",                'service_uid': "s.service_uid in (%(service_uid)s)"}      query = '''select rme.image_path image, rmt.title title, ime.program_unique_id puid, s.short_name service_name, s.service_id sid, ime.begin_time, ime.ims_event_id %(imsdb)s.service s join %(imsdb)s.event ime on ime.service_uid = s.service_uid left join %(rmsdb)s.event rme on ime.eit_id = rme.event_id , rme.service_uid = ime.service_uid left join %(rmsdb)s.text_data rmt on rmt.text_id = rme.text_id left join %(rmsdb)s.channellogo rch on rch.suid = s.service_uid %(whereclause)s %(sortby)s %(limit)s'''

the problem have line: 

where_clauses = [(given_fields[k] % pagedata) k in given_fields if pagedata[k].strip() != '']

how escape apostrophes in field?

the databases mysql foreseeable future.

for more completeness on how "used", here's django view looks like: 

def index(request):   cursor = connection.cursor()   q = querybuilder(entity=querybuilder.event, rmsdb=sources.getcurrentrmsdb(request), imsdb=sources.getcurrentimsdb(request))   sql = q.buildquery(request.get, num_per_page)   return httpresponse(sql)   cursor.execute(sql)   return render(request, 'rma/event.html', {'results' : dictfetchall(cursor)})

well, problem known enough , solution specified in pep249: connector module's paramstyle defines how pass strings without need manual escape. in usual mysql driver, paramstyle = "qmark", understands pyformat style.

also can format these string constants manually, but, due sql specifics, dbms dependable.


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