veekun_pokedex/pokedex/__init__.py

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# 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
# Use autocommit in case rows fail due to foreign key incest
session = connect(engine_uri, autocommit=True, autoflush=False)
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. We'll keep
# a running list of these and try inserting them again after the
# rest are done
failed_rows = []
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)
try:
session.add(row)
session.flush()
except IntegrityError, e:
failed_rows.append(row)
# Loop over the failed rows and keep trying to insert them. If a loop
# doesn't manage to insert any rows, bail.
do_another_loop = True
while failed_rows and do_another_loop:
do_another_loop = False
for i, row in enumerate(failed_rows):
try:
session.add(row)
session.flush()
# Success!
del failed_rows[i]
do_another_loop = True
except IntegrityError, e:
pass
if failed_rows:
print len(failed_rows), "rows failed"
else:
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.
"""
sys.exit(0)