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     # SQLAlchemy is retarded and there is no way for me to get a list of ORM
  33     # classes besides to inspect the module they all happen to live in for
  34     # things that look right.
  35     table_base = tables_module.TableBase
  36     orm_classes = {}  # table object => table class
  37
  38     for name in dir(tables_module):
  39         # dir() returns strings!  How /convenient/.
  40         thingy = getattr(tables_module, name)
  41
  42         if not isinstance(thingy, type):
  43             # Not a class; bail
  44             continue
  45         elif not issubclass(thingy, table_base):
  46             # Not a declarative table; bail
  47             continue
  48         elif thingy == table_base:
  49             # Declarative table base, so not a real table; bail
  50             continue
  51
  52         # thingy is definitely a table class!  Hallelujah.
  53         orm_classes[thingy.__table__] = thingy
  54
  55     # Okay, run through the tables and actually load the data now
  56     for table_obj in metadata.sorted_tables:
  57         table_class = orm_classes[table_obj]
  58         table_name = table_obj.name
  59
  60         # Print the table name but leave the cursor in a fixed column
  61         print table_name + '...', ' ' * (40 - len(table_name)),
  62
  63         try:
  64             csvfile = open("%s/%s.csv" % (directory, table_name), 'rb')
  65         except IOError:
  66             # File doesn't exist; don't load anything!
  67             print 'no data!'
  68             continue
  69
  70         reader = csv.reader(csvfile, lineterminator='\n')
  71         column_names = [unicode(column) for column in reader.next()]
  72
  73         for csvs in reader:
  74             row = table_class()
  75
  76             for column_name, value in zip(column_names, csvs):
  77                 column = table_obj.c[column_name]
  78                 if column.nullable and value == '':
  79                     # Empty string in a nullable column really means NULL
  80                     value = None
  81                 elif isinstance(column.type, sqlalchemy.types.Boolean):
  82                     # Boolean values are stored as string values 0/1, but both
  83                     # of those evaluate as true; SQLA wants True/False
  84                     if value == '0':
  85                         value = False
  86                     else:
  87                         value = True
  88                 else:
  89                     # Otherwise, unflatten from bytes
  90                     value = value.decode('utf-8')
  91
  92                 setattr(row, column_name, value)
  93
  94             session.add(row)
  95
  96         session.commit()
  97         print 'loaded'
  98
  99
 100 def csvexport(engine_uri, directory='.'):
 101     import csv
 102     session = connect(engine_uri)
 103
 104     for table_name in sorted(metadata.tables.keys()):
 105         print table_name
 106         table = metadata.tables[table_name]
 107
 108         writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
 109                             lineterminator='\n')
 110         columns = [col.name for col in table.columns]
 111         writer.writerow(columns)
 112
 113         for row in session.query(table).all():
 114             csvs = []
 115             for col in columns:
 116                 # Convert Pythony values to something more universal
 117                 val = getattr(row, col)
 118                 if val == None:
 119                     val = ''
 120                 elif val == True:
 121                     val = '1'
 122                 elif val == False:
 123                     val = '0'
 124                 else:
 125                     val = unicode(val).encode('utf-8')
 126
 127                 csvs.append(val)
 128
 129             writer.writerow(csvs)
 130
 131
 132 def help():
 133     print u"""pokedex -- a command-line Pokédex interface
 134
 135     help                        Displays this message.
 136
 137   These commands are only useful for developers:
 138     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 139                                   given by the URI.
 140     csvexport {uri} [dir]       Export data from the database given by the URI
 141                                   to a set of CSVs.
 142                                 Directory defaults to cwd.
 143 """
 144
 145     sys.exit(0)