pokedex/__init__.py

   1 # encoding: utf8
   2 import sys
   3
   4 import sqlalchemy.types
   5
   6 from .db import connect, metadata
   7
   8 def main():
   9     if len(sys.argv) <= 1:
  10         help()
  11
  12     command = sys.argv[1]
  13     args = sys.argv[2:]
  14
  15     # Find the command as a function in this file
  16     func = globals().get(command, None)
  17     if func and callable(func) and command != 'main':
  18         func(*args)
  19     else:
  20         help()
  21
  22
  23 def csvimport(engine_uri, dir='.'):
  24     import csv
  25
  26     from sqlalchemy.orm.attributes import instrumentation_registry
  27
  28     session = connect(engine_uri)
  29
  30     metadata.create_all()
  31
  32     # Oh, mysql-chan.
  33     # TODO try to insert data in preorder so we don't need this hack and won't
  34     #      break similarly on other engines
  35     if 'mysql' in engine_uri:
  36         session.execute('SET FOREIGN_KEY_CHECKS = 0')
  37
  38     # This is a secret attribute on a secret singleton of a secret class that
  39     # appears to hopefully contain all registered classes as keys.
  40     # There is no other way to accomplish this, as far as I can tell.
  41     # Fuck.
  42     for table in sorted(instrumentation_registry.manager_finders.keys(),
  43                         key=lambda self: self.__table__.name):
  44         table_name = table.__table__.name
  45         print table_name
  46
  47         reader = csv.reader(open("%s/%s.csv" % (dir, table_name), 'rb'), lineterminator='\n')
  48         column_names = [unicode(column) for column in reader.next()]
  49
  50         for csvs in reader:
  51             row = table()
  52
  53             for column_name, value in zip(column_names, csvs):
  54                 column = table.__table__.c[column_name]
  55                 if column.nullable and value == '':
  56                     # Empty string in a nullable column really means NULL
  57                     value = None
  58                 elif isinstance(column.type, sqlalchemy.types.Boolean):
  59                     # Boolean values are stored as string values 0/1, but both
  60                     # of those evaluate as true; SQLA wants True/False
  61                     if value == '0':
  62                         value = False
  63                     else:
  64                         value = True
  65                 else:
  66                     # Otherwise, unflatten from bytes
  67                     value = value.decode('utf-8')
  68
  69                 setattr(row, column_name, value)
  70
  71             session.add(row)
  72
  73         session.commit()
  74
  75     # Shouldn't matter since this is usually the end of the program and thus
  76     # the connection too, but let's change this back just in case
  77     if 'mysql' in engine_uri:
  78         session.execute('SET FOREIGN_KEY_CHECKS = 1')
  79
  80
  81 def csvexport(engine_uri, dir='.'):
  82     import csv
  83     session = connect(engine_uri)
  84
  85     for table_name in sorted(metadata.tables.keys()):
  86         print table_name
  87         table = metadata.tables[table_name]
  88
  89         writer = csv.writer(open("%s/%s.csv" % (dir, table_name), 'wb'), lineterminator='\n')
  90         columns = [col.name for col in table.columns]
  91         writer.writerow(columns)
  92
  93         for row in session.query(table).all():
  94             csvs = []
  95             for col in columns:
  96                 # Convert Pythony values to something more universal
  97                 val = getattr(row, col)
  98                 if val == None:
  99                     val = ''
 100                 elif val == True:
 101                     val = '1'
 102                 elif val == False:
 103                     val = '0'
 104                 else:
 105                     val = unicode(val).encode('utf-8')
 106
 107                 csvs.append(val)
 108
 109             writer.writerow(csvs)
 110
 111
 112 def help():
 113     print u"""pokedex -- a command-line Pokédex interface
 114
 115     help                        Displays this message.
 116
 117   These commands are only useful for developers:
 118     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 119                                   given by the URI.
 120     csvexport {uri} [dir]       Export data from the database given by the URI
 121                                   to a set of CSVs.
 122                                 Directory defaults to cwd.
 123 """
 124
 125     sys.exit(0)