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 the table name but leave the cursor in a fixed column
  46         print table_name + '...', ' ' * (40 - len(table_name)),
  47
  48         try:
  49             csvfile = open("%s/%s.csv" % (dir, table_name), 'rb')
  50         except IOError:
  51             # File doesn't exist; don't load anything!
  52             print 'no data!'
  53             continue
  54
  55         reader = csv.reader(csvfile, lineterminator='\n')
  56         column_names = [unicode(column) for column in reader.next()]
  57
  58         for csvs in reader:
  59             row = table()
  60
  61             for column_name, value in zip(column_names, csvs):
  62                 column = table.__table__.c[column_name]
  63                 if column.nullable and value == '':
  64                     # Empty string in a nullable column really means NULL
  65                     value = None
  66                 elif isinstance(column.type, sqlalchemy.types.Boolean):
  67                     # Boolean values are stored as string values 0/1, but both
  68                     # of those evaluate as true; SQLA wants True/False
  69                     if value == '0':
  70                         value = False
  71                     else:
  72                         value = True
  73                 else:
  74                     # Otherwise, unflatten from bytes
  75                     value = value.decode('utf-8')
  76
  77                 setattr(row, column_name, value)
  78
  79             session.add(row)
  80
  81         session.commit()
  82         print 'loaded'
  83
  84     # Shouldn't matter since this is usually the end of the program and thus
  85     # the connection too, but let's change this back just in case
  86     if 'mysql' in engine_uri:
  87         session.execute('SET FOREIGN_KEY_CHECKS = 1')
  88
  89
  90 def csvexport(engine_uri, dir='.'):
  91     import csv
  92     session = connect(engine_uri)
  93
  94     for table_name in sorted(metadata.tables.keys()):
  95         print table_name
  96         table = metadata.tables[table_name]
  97
  98         writer = csv.writer(open("%s/%s.csv" % (dir, table_name), 'wb'), lineterminator='\n')
  99         columns = [col.name for col in table.columns]
 100         writer.writerow(columns)
 101
 102         for row in session.query(table).all():
 103             csvs = []
 104             for col in columns:
 105                 # Convert Pythony values to something more universal
 106                 val = getattr(row, col)
 107                 if val == None:
 108                     val = ''
 109                 elif val == True:
 110                     val = '1'
 111                 elif val == False:
 112                     val = '0'
 113                 else:
 114                     val = unicode(val).encode('utf-8')
 115
 116                 csvs.append(val)
 117
 118             writer.writerow(csvs)
 119
 120
 121 def help():
 122     print u"""pokedex -- a command-line Pokédex interface
 123
 124     help                        Displays this message.
 125
 126   These commands are only useful for developers:
 127     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 128                                   given by the URI.
 129     csvexport {uri} [dir]       Export data from the database given by the URI
 130                                   to a set of CSVs.
 131                                 Directory defaults to cwd.
 132 """
 133
 134     sys.exit(0)