-# encoding: utf8
-import sys
-
-from sqlalchemy.exc import IntegrityError
-import sqlalchemy.types
-
-from .db import connect, metadata, tables as tables_module
-from pokedex.lookup import lookup as pokedex_lookup
-
-def main():
- if len(sys.argv) <= 1:
- help()
-
- command = sys.argv[1]
- args = sys.argv[2:]
-
- # Find the command as a function in this file
- func = globals().get("command_%s" % command, None)
- if func:
- func(*args)
- else:
- command_help()
-
-
-def command_csvimport(engine_uri, directory='.'):
- import csv
-
- from sqlalchemy.orm.attributes import instrumentation_registry
-
- session = connect(engine_uri)
-
- metadata.create_all()
-
- # SQLAlchemy is retarded and there is no way for me to get a list of ORM
- # classes besides to inspect the module they all happen to live in for
- # things that look right.
- table_base = tables_module.TableBase
- orm_classes = {} # table object => table class
-
- for name in dir(tables_module):
- # dir() returns strings! How /convenient/.
- thingy = getattr(tables_module, name)
-
- if not isinstance(thingy, type):
- # Not a class; bail
- continue
- elif not issubclass(thingy, table_base):
- # Not a declarative table; bail
- continue
- elif thingy == table_base:
- # Declarative table base, so not a real table; bail
- continue
-
- # thingy is definitely a table class! Hallelujah.
- orm_classes[thingy.__table__] = thingy
-
- # Okay, run through the tables and actually load the data now
- for table_obj in metadata.sorted_tables:
- table_class = orm_classes[table_obj]
- table_name = table_obj.name
-
- # Print the table name but leave the cursor in a fixed column
- print table_name + '...', ' ' * (40 - len(table_name)),
- sys.stdout.flush()
-
- try:
- csvfile = open("%s/%s.csv" % (directory, table_name), 'rb')
- except IOError:
- # File doesn't exist; don't load anything!
- print 'no data!'
- continue
-
- reader = csv.reader(csvfile, lineterminator='\n')
- column_names = [unicode(column) for column in reader.next()]
-
- # Self-referential tables may contain rows with foreign keys of other
- # rows in the same table that do not yet exist. Pull these out and add
- # them to the session last
- # ASSUMPTION: Self-referential tables have a single PK called "id"
- deferred_rows = [] # ( row referring to id, [foreign ids we need] )
- seen_ids = {} # primary key we've seen => 1
-
- # Fetch foreign key columns that point at this table, if any
- self_ref_columns = []
- for column in table_obj.c:
- if any(_.references(table_obj) for _ in column.foreign_keys):
- self_ref_columns.append(column)
-
- for csvs in reader:
- row = table_class()
-
- for column_name, value in zip(column_names, csvs):
- column = table_obj.c[column_name]
- if column.nullable and value == '':
- # Empty string in a nullable column really means NULL
- value = None
- elif isinstance(column.type, sqlalchemy.types.Boolean):
- # Boolean values are stored as string values 0/1, but both
- # of those evaluate as true; SQLA wants True/False
- if value == '0':
- value = False
- else:
- value = True
- else:
- # Otherwise, unflatten from bytes
- value = value.decode('utf-8')
-
- setattr(row, column_name, value)
-
- # May need to stash this row and add it later if it refers to a
- # later row in this table
- if self_ref_columns:
- foreign_ids = [getattr(row, _.name) for _ in self_ref_columns]
- foreign_ids = [_ for _ in foreign_ids if _] # remove NULL ids
-
- if not foreign_ids:
- # NULL key. Remember this row and add as usual.
- seen_ids[row.id] = 1
-
- elif all(_ in seen_ids for _ in foreign_ids):
- # Non-NULL key we've already seen. Remember it and commit
- # so we know the old row exists when we add the new one
- session.commit()
- seen_ids[row.id] = 1
-
- else:
- # Non-NULL future id. Save this and insert it later!
- deferred_rows.append((row, foreign_ids))
- continue
-
- session.add(row)
-
- session.commit()
-
- # Attempt to add any spare rows we've collected
- for row, foreign_ids in deferred_rows:
- if not all(_ in seen_ids for _ in foreign_ids):
- # Could happen if row A refers to B which refers to C.
- # This is ridiculous and doesn't happen in my data so far
- raise ValueError("Too many levels of self-reference! "
- "Row was: " + str(row.__dict__))
-
- session.add(row)
- seen_ids[row.id] = 1
- session.commit()
-
- print 'loaded'
-
-def command_csvexport(engine_uri, directory='.'):
- import csv
- session = connect(engine_uri)
-
- for table_name in sorted(metadata.tables.keys()):
- print table_name
- table = metadata.tables[table_name]
-
- writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
- lineterminator='\n')
- columns = [col.name for col in table.columns]
- writer.writerow(columns)
-
- primary_key = table.primary_key
- for row in session.query(table).order_by(*primary_key).all():
- csvs = []
- for col in columns:
- # Convert Pythony values to something more universal
- val = getattr(row, col)
- if val == None:
- val = ''
- elif val == True:
- val = '1'
- elif val == False:
- val = '0'
- else:
- val = unicode(val).encode('utf-8')
-
- csvs.append(val)
-
- writer.writerow(csvs)
-
-def command_lookup(engine_uri, name):
- # XXX don't require uri! somehow
- session = connect(engine_uri)
-
- results, exact = pokedex_lookup(session, name)
- if exact:
- print "Matched:"
- else:
- print "Fuzzy-matched:"
-
- for object in results:
- print object.__tablename__, object.name
-
-
-def command_help():
- print u"""pokedex -- a command-line Pokédex interface
-
- help Displays this message.
- lookup {uri} [name] Look up something in the Pokédex.
-
- These commands are only useful for developers:
- csvimport {uri} [dir] Import data from a set of CSVs to the database
- given by the URI.
- csvexport {uri} [dir] Export data from the database given by the URI
- to a set of CSVs.
- Directory defaults to cwd.
-""".encode(sys.getdefaultencoding(), 'replace')
-
- sys.exit(0)
projects / zzz-pokedex.git / blobdiff