X-Git-Url: http://git.veekun.com/zzz-pokedex.git/blobdiff_plain/6a49139f94f9dd48ebbb21dac3423fb79f7fe4ce..93be19674c4072725be9aa4eac890931c8b0e294:/pokedex/db/load.py diff --git a/pokedex/db/load.py b/pokedex/db/load.py index e3e7fa5..6a548b8 100644 --- a/pokedex/db/load.py +++ b/pokedex/db/load.py @@ -1,8 +1,7 @@ """CSV to database or vice versa.""" import csv +import fnmatch import os.path -import pkg_resources -import re import sys from sqlalchemy.orm.attributes import instrumentation_registry @@ -11,38 +10,27 @@ import sqlalchemy.types from pokedex.db import metadata import pokedex.db.tables as tables +from pokedex.defaults import get_default_csv_dir -def _wildcard_char_to_regex(char): - """Converts a single wildcard character to the regex equivalent.""" - - if char == '?': - return '.?' - elif char == '*': - return '.*' +def _get_table_names(metadata, patterns): + """Returns a list of table names from the given metadata. If `patterns` + exists, only tables matching one of the patterns will be returned. + """ + if patterns: + table_names = set() + for pattern in patterns: + if '.' in pattern or '/' in pattern: + # If it looks like a filename, pull out just the table name + _, filename = os.path.split(pattern) + table_name, _ = os.path.splitext(filename) + pattern = table_name + + table_names.update(fnmatch.filter(metadata.tables.keys(), pattern)) else: - return re.escape(char) - -def _wildcard_glob_to_regex(glob): - """Converts a single wildcard glob to a regex STRING.""" - - # If it looks like a filename, make it not one - if '.' in glob or '/' in glob: - _, filename = os.path.split(glob) - table_name, _ = os.path.splitext(filename) - glob = table_name - - return u''.join(map(_wildcard_char_to_regex, glob)) - -def _wildcards_to_regex(strings): - """Converts a list of wildcard globs to a single regex object.""" - - regex_parts = map(_wildcard_glob_to_regex, strings) - - regex = '^(?:' + '|'.join(regex_parts) + ')$' - - return re.compile(regex) + table_names = metadata.tables.keys() + return list(table_names) def _get_verbose_prints(verbose): """If `verbose` is true, returns three functions: one for printing a @@ -107,7 +95,7 @@ def _get_verbose_prints(verbose): return print_start, print_status, print_done -def load(session, tables=[], directory=None, drop_tables=False, verbose=False): +def load(session, tables=[], directory=None, drop_tables=False, verbose=False, safe=True): """Load data from CSV files into the given database session. Tables are created automatically. @@ -127,34 +115,41 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False): `verbose` If set to True, status messages will be printed to stdout. + + `safe` + If set to False, load can be faster, but can corrupt the database if + it crashes or is interrupted. """ # First take care of verbosity print_start, print_status, print_done = _get_verbose_prints(verbose) - if not directory: - directory = pkg_resources.resource_filename('pokedex', 'data/csv') - - if tables: - regex = _wildcards_to_regex(tables) - table_names = filter(regex.match, metadata.tables.keys()) - else: - table_names = metadata.tables.keys() + if directory is None: + directory = get_default_csv_dir() + table_names = _get_table_names(metadata, tables) table_objs = [metadata.tables[name] for name in table_names] table_objs = sqlalchemy.sql.util.sort_tables(table_objs) + # SQLite speed tweaks + if not safe and session.connection().dialect.name == 'sqlite': + session.connection().execute("PRAGMA synchronous=OFF") + session.connection().execute("PRAGMA journal_mode=OFF") # Drop all tables if requested if drop_tables: print_start('Dropping tables') - for table in reversed(table_objs): + for n, table in enumerate(reversed(table_objs)): table.drop(checkfirst=True) + print_status('%s/%s' % (n, len(table_objs))) print_done() - for table in table_objs: + print_start('Creating tables') + for n, table in enumerate(table_objs): table.create() + print_status('%s/%s' % (n, len(table_objs))) + print_done() connection = session.connection() # Okay, run through the tables and actually load the data now @@ -177,6 +172,32 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False): reader = csv.reader(csvfile, lineterminator='\n') column_names = [unicode(column) for column in reader.next()] + if not safe and session.connection().dialect.name == 'postgresql': + """ + Postgres' CSV dialect works with our data, if we mark the not-null + columns with FORCE NOT NULL. + COPY is only allowed for DB superusers. If you're not one, use safe + loading (pokedex load -S). + """ + session.commit() + not_null_cols = [c for c in column_names if not table_obj.c[c].nullable] + if not_null_cols: + force_not_null = 'FORCE NOT NULL ' + ','.join('"%s"' % c for c in not_null_cols) + else: + force_not_null = '' + command = "COPY {table_name} ({columns}) FROM '{csvpath}' CSV HEADER {force_not_null}" + session.connection().execute( + command.format( + table_name=table_name, + csvpath=csvpath, + columns=','.join('"%s"' % c for c in column_names), + force_not_null=force_not_null, + ) + ) + session.commit() + print_done() + continue + # 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 @@ -192,11 +213,13 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False): new_rows = [] def insert_and_commit(): + if not new_rows: + return session.connection().execute(insert_stmt, new_rows) session.commit() new_rows[:] = [] - progress = "{0}%".format(100 * csvfile.tell() // csvsize) + progress = "%d%%" % (100 * csvfile.tell() // csvsize) print_status(progress) for csvs in reader: @@ -268,6 +291,10 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False): print_done() + # SQLite check + if session.connection().dialect.name == 'sqlite': + session.connection().execute("PRAGMA integrity_check") + def dump(session, tables=[], directory=None, verbose=False): @@ -293,14 +320,9 @@ def dump(session, tables=[], directory=None, verbose=False): if not directory: - directory = pkg_resources.resource_filename('pokedex', 'data/csv') - - if tables: - regex = _wildcards_to_regex(tables) - table_names = filter(regex.match, metadata.tables.keys()) - else: - table_names = metadata.tables.keys() + directory = get_default_csv_dir() + table_names = _get_table_names(metadata, tables) table_names.sort()