pokedex/__init__.py

   1 # encoding: utf8
   2 import sys
   3
   4 import sqlalchemy.types
   5
   6 from .db import connect, metadata, tables as tables_module
   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, directory='.'):
  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     # SQLAlchemy is retarded and there is no way for me to get a list of ORM
  39     # classes besides to inspect the module they all happen to live in for
  40     # things that look right.
  41     table_base = tables_module.TableBase
  42     orm_classes = {}
  43
  44     for name in dir(tables_module):
  45         # dir() returns strings!  How /convenient/.
  46         thingy = getattr(tables_module, name)
  47
  48         if not isinstance(thingy, type):
  49             # Not a class; bail
  50             continue
  51         elif not issubclass(thingy, table_base):
  52             # Not a declarative table; bail
  53             continue
  54         elif thingy == table_base:
  55             # Declarative table base, so not a real table; bail
  56             continue
  57
  58         # thingy is definitely a table class!  Hallelujah.
  59         orm_classes[thingy.__table__.name] = thingy
  60
  61     # Okay, run through the tables and actually load the data now
  62     for table_name, table in sorted(orm_classes.items()):
  63         # Print the table name but leave the cursor in a fixed column
  64         print table_name + '...', ' ' * (40 - len(table_name)),
  65
  66         try:
  67             csvfile = open("%s/%s.csv" % (directory, table_name), 'rb')
  68         except IOError:
  69             # File doesn't exist; don't load anything!
  70             print 'no data!'
  71             continue
  72
  73         reader = csv.reader(csvfile, lineterminator='\n')
  74         column_names = [unicode(column) for column in reader.next()]
  75
  76         for csvs in reader:
  77             row = table()
  78
  79             for column_name, value in zip(column_names, csvs):
  80                 column = table.__table__.c[column_name]
  81                 if column.nullable and value == '':
  82                     # Empty string in a nullable column really means NULL
  83                     value = None
  84                 elif isinstance(column.type, sqlalchemy.types.Boolean):
  85                     # Boolean values are stored as string values 0/1, but both
  86                     # of those evaluate as true; SQLA wants True/False
  87                     if value == '0':
  88                         value = False
  89                     else:
  90                         value = True
  91                 else:
  92                     # Otherwise, unflatten from bytes
  93                     value = value.decode('utf-8')
  94
  95                 setattr(row, column_name, value)
  96
  97             session.add(row)
  98
  99         session.commit()
 100         print 'loaded'
 101
 102     # Shouldn't matter since this is usually the end of the program and thus
 103     # the connection too, but let's change this back just in case
 104     if 'mysql' in engine_uri:
 105         session.execute('SET FOREIGN_KEY_CHECKS = 1')
 106
 107
 108 def csvexport(engine_uri, directory='.'):
 109     import csv
 110     session = connect(engine_uri)
 111
 112     for table_name in sorted(metadata.tables.keys()):
 113         print table_name
 114         table = metadata.tables[table_name]
 115
 116         writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
 117                             lineterminator='\n')
 118         columns = [col.name for col in table.columns]
 119         writer.writerow(columns)
 120
 121         for row in session.query(table).all():
 122             csvs = []
 123             for col in columns:
 124                 # Convert Pythony values to something more universal
 125                 val = getattr(row, col)
 126                 if val == None:
 127                     val = ''
 128                 elif val == True:
 129                     val = '1'
 130                 elif val == False:
 131                     val = '0'
 132                 else:
 133                     val = unicode(val).encode('utf-8')
 134
 135                 csvs.append(val)
 136
 137             writer.writerow(csvs)
 138
 139
 140 def help():
 141     print u"""pokedex -- a command-line Pokédex interface
 142
 143     help                        Displays this message.
 144
 145   These commands are only useful for developers:
 146     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 147                                   given by the URI.
 148     csvexport {uri} [dir]       Export data from the database given by the URI
 149                                   to a set of CSVs.
 150                                 Directory defaults to cwd.
 151 """
 152
 153     sys.exit(0)