# encoding: utf8
import sys
+from sqlalchemy.exc import IntegrityError
import sqlalchemy.types
-from .db import connect, metadata
+from .db import connect, metadata, tables as tables_module
+from pokedex.lookup import lookup as pokedex_lookup
def main():
if len(sys.argv) <= 1:
args = sys.argv[2:]
# Find the command as a function in this file
- func = globals().get(command, None)
- if func and callable(func) and command != 'main':
+ func = globals().get("command_%s" % command, None)
+ if func:
func(*args)
else:
- help()
+ command_help()
-def csvimport(engine_uri, dir='.'):
+def command_csvimport(engine_uri, directory='.'):
import csv
from sqlalchemy.orm.attributes import instrumentation_registry
metadata.create_all()
- # Oh, mysql-chan.
- # TODO try to insert data in preorder so we don't need this hack and won't
- # break similarly on other engines
- if 'mysql' in engine_uri:
- session.execute('SET FOREIGN_KEY_CHECKS = 0')
-
- # This is a secret attribute on a secret singleton of a secret class that
- # appears to hopefully contain all registered classes as keys.
- # There is no other way to accomplish this, as far as I can tell.
- # Fuck.
- for table in sorted(instrumentation_registry.manager_finders.keys(),
- key=lambda self: self.__table__.name):
- table_name = table.__table__.name
- print table_name
-
- reader = csv.reader(open("%s/%s.csv" % (dir, table_name), 'rb'), lineterminator='\n')
+ # 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()
+ row = table_class()
for column_name, value in zip(column_names, csvs):
- column = table.__table__.c[column_name]
+ column = table_obj.c[column_name]
if column.nullable and value == '':
# Empty string in a nullable column really means NULL
value = None
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()
- # Shouldn't matter since this is usually the end of the program and thus
- # the connection too, but let's change this back just in case
- if 'mysql' in engine_uri:
- session.execute('SET FOREIGN_KEY_CHECKS = 1')
+ # 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 csvexport(engine_uri, dir='.'):
+def command_csvexport(engine_uri, directory='.'):
import csv
session = connect(engine_uri)
print table_name
table = metadata.tables[table_name]
- writer = csv.writer(open("%s/%s.csv" % (dir, table_name), 'wb'), lineterminator='\n')
+ writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
+ lineterminator='\n')
columns = [col.name for col in table.columns]
writer.writerow(columns)
- for row in session.query(table).all():
+ 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
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 help():
+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
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