pokedex/__init__.py

   1 # encoding: utf8
   2 import sys
   3
   4 from .db import connect, metadata
   5
   6 def main():
   7     if len(sys.argv) <= 1:
   8         help()
   9
  10     command = sys.argv[1]
  11     args = sys.argv[2:]
  12
  13     # Find the command as a function in this file
  14     func = globals().get(command, None)
  15     if func and callable(func) and command != 'main':
  16         func(*args)
  17     else:
  18         help()
  19
  20
  21 def csvimport(engine_uri, dir='.'):
  22     import csv
  23
  24     from sqlalchemy.orm.attributes import instrumentation_registry
  25
  26     session = connect(engine_uri)
  27
  28     metadata.create_all()
  29
  30     # Oh, mysql-chan.
  31     # TODO try to insert data in preorder so we don't need this hack and won't
  32     #      break similarly on other engines
  33     if 'mysql' in engine_uri:
  34         session.execute('SET FOREIGN_KEY_CHECKS = 0')
  35
  36     # This is a secret attribute on a secret singleton of a secret class that
  37     # appears to hopefully contain all registered classes as keys.
  38     # There is no other way to accomplish this, as far as I can tell.
  39     # Fuck.
  40     for table in sorted(instrumentation_registry.manager_finders.keys(),
  41                         key=lambda self: self.__table__.name):
  42         table_name = table.__table__.name
  43         print table_name
  44
  45         reader = csv.reader(open("%s/%s.csv" % (dir, table_name), 'rb'), lineterminator='\n')
  46         column_names = [unicode(column) for column in reader.next()]
  47
  48         for csvs in reader:
  49             row = table()
  50
  51             for column_name, value in zip(column_names, csvs):
  52                 if table.__table__.c[column_name].nullable and value == '':
  53                     # Empty string in a nullable column really means NULL
  54                     value = None
  55                 else:
  56                     # Otherwise, unflatten from bytes
  57                     value = value.decode('utf-8')
  58
  59                 setattr(row, column_name, value)
  60
  61             session.add(row)
  62
  63         session.commit()
  64
  65     # Shouldn't matter since this is usually the end of the program and thus
  66     # the connection too, but let's change this back just in case
  67     if 'mysql' in engine_uri:
  68         session.execute('SET FOREIGN_KEY_CHECKS = 1')
  69
  70
  71 def csvexport(engine_uri, dir='.'):
  72     import csv
  73     session = connect(engine_uri)
  74
  75     for table_name in sorted(metadata.tables.keys()):
  76         print table_name
  77         table = metadata.tables[table_name]
  78
  79         writer = csv.writer(open("%s/%s.csv" % (dir, table_name), 'wb'), lineterminator='\n')
  80         columns = [col.name for col in table.columns]
  81         writer.writerow(columns)
  82
  83         for row in session.query(table).all():
  84             csvs = []
  85             for col in columns:
  86                 # Convert Pythony values to something more universal
  87                 val = getattr(row, col)
  88                 if val == None:
  89                     val = ''
  90                 elif val == True:
  91                     val = '1'
  92                 elif val == False:
  93                     val = '0'
  94                 else:
  95                     val = unicode(val).encode('utf-8')
  96
  97                 csvs.append(val)
  98
  99             writer.writerow(csvs)
 100
 101
 102 def help():
 103     print u"""pokedex -- a command-line Pokédex interface
 104
 105     help                        Displays this message.
 106
 107   These commands are only useful for developers:
 108     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 109                                   given by the URI.
 110     csvexport {uri} [dir]       Export data from the database given by the URI
 111                                   to a set of CSVs.
 112                                 Directory defaults to cwd.
 113 """
 114
 115     sys.exit(0)