[IMP] try to terminate all postgresql backends connected to a database before dropping it

bzr revid: chs@openerp.com-20120222102639-q19kiykopb3b3qu0

openerp/service/web_services.py

@@ -173,6 +173,8 @@ class db(netsvc.ExportService):
                 raise Exception, e
 
     def exp_drop(self, db_name):
+        if not self.exp_db_exist(db_name):
+            return False
         openerp.modules.registry.RegistryManager.delete(db_name)
         sql_db.close_db(db_name)
 
@@ -180,6 +182,13 @@ class db(netsvc.ExportService):
         cr = db.cursor()
         cr.autocommit(True) # avoid transaction block
         try:
+            try:
+                cr.execute('SELECT DISTINCT procpid FROM pg_stat_activity WHERE datname=%s', (db_name,))
+                for procpid, in cr.fetchall():
+                    cr.execute('SELECT pg_terminate_backend(%d)' % (procpid,))
+            except Exception:
+                pass
+            
             try:
                 cr.execute('DROP DATABASE "%s"' % db_name)
             except Exception, e: