Revision 1fd14d3d

b/snf-common/synnefo/lib/db/managers.py
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from django.db import connections


  		





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from django.db.models import Manager


  		





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from django.db.models.query import QuerySet


  		





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from django.db.models.query import QuerySet, EmptyQuerySet


  		





  
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from django.db.models.sql.datastructures import EmptyResultSet


  		





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class ForUpdateManager(Manager):


  		





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    """ Model manager implementing SELECT .. FOR UPDATE statement


  		





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    if 'sqlite' in connections[query.db].settings_dict['ENGINE'].lower():


  		





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        # SQLite  does not support FOR UPDATE


  		





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        return query


  		





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    sql, params = query.query.get_compiler(query.db).as_sql()


  		





  
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    try:


  		





  
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        sql, params = query.query.get_compiler(query.db).as_sql()


  		





  
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    except EmptyResultSet:


  		





  
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        return EmptyQuerySet()


  		





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    return query.model._default_manager.raw(sql.rstrip() + ' FOR UPDATE',


  		





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                                            params)


  		












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