X-Git-Url: http://git.veekun.com/zzz-pokedex.git/blobdiff_plain/c0c111bb674c04565fc86c50435c0ce0fb0ca3f3..b14e23c787f1177d09d358fea683c6d72ce3d757:/pokedex/db/load.py diff --git a/pokedex/db/load.py b/pokedex/db/load.py index a6e9d4a..d307fd8 100644 --- a/pokedex/db/load.py +++ b/pokedex/db/load.py @@ -11,6 +11,7 @@ import sqlalchemy.types from pokedex.db import metadata import pokedex.db.tables as tables from pokedex.defaults import get_default_csv_dir +from pokedex.db.dependencies import find_dependent_tables def _get_table_names(metadata, patterns): @@ -52,7 +53,7 @@ def _get_verbose_prints(verbose): def print_start(thing): # Truncate to 66 characters, leaving 10 characters for a success # or failure message - truncated_thing = thing[0:66] + truncated_thing = thing[:66] # Also, space-pad to keep the cursor in a known column num_spaces = 66 - len(truncated_thing) @@ -95,7 +96,7 @@ def _get_verbose_prints(verbose): return print_start, print_status, print_done -def load(session, tables=[], directory=None, drop_tables=False, verbose=False, safe=True): +def load(session, tables=[], directory=None, drop_tables=False, verbose=False, safe=True, recursive=False): """Load data from CSV files into the given database session. Tables are created automatically. @@ -119,6 +120,9 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s `safe` If set to False, load can be faster, but can corrupt the database if it crashes or is interrupted. + + `recursive` + If set to True, load all dependent tables too. """ # First take care of verbosity @@ -128,8 +132,13 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s if directory is None: directory = get_default_csv_dir() + # XXX why isn't this done in command_load table_names = _get_table_names(metadata, tables) table_objs = [metadata.tables[name] for name in table_names] + + if recursive: + table_objs.extend(find_dependent_tables(table_objs)) + table_objs = sqlalchemy.sql.util.sort_tables(table_objs) # SQLite speed tweaks @@ -174,14 +183,10 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s if not safe and session.connection().dialect.name == 'postgresql': """ - Postgres' CSV dialect is nearly the same as ours, except that it - treats completely empty values as NULL, and empty quoted - strings ("") as an empty strings. - Pokedex dump does not quote empty strings. So, both empty strings - and NULLs are read in as NULL. - For an empty string in a NOT NULL column, the load will fail, and - load will fall back to the cross-backend row-by-row loading. And in - nullable columns, we already load empty stings as NULL. + 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] @@ -189,15 +194,15 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s 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}" + command = "COPY %(table_name)s (%(columns)s) FROM '%(csvpath)s' CSV HEADER %(force_not_null)s" 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, - ) + command % dict( + 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 @@ -207,16 +212,18 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s # 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 + seen_ids = set() # primary keys we've seen # 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): + if any(x.references(table_obj) for x in column.foreign_keys): self_ref_columns.append(column) new_rows = [] def insert_and_commit(): + if not new_rows: + return session.connection().execute(insert_stmt, new_rows) session.commit() new_rows[:] = [] @@ -249,18 +256,18 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s # 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 = [row_data[_.name] for _ in self_ref_columns] - foreign_ids = [_ for _ in foreign_ids if _] # remove NULL ids + foreign_ids = set(row_data[x.name] for x in self_ref_columns) + foreign_ids.discard(None) # remove NULL ids if not foreign_ids: # NULL key. Remember this row and add as usual. - seen_ids[row_data['id']] = 1 + seen_ids.add(row_data['id']) - elif all(_ in seen_ids for _ in foreign_ids): + elif foreign_ids.issubset(seen_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 insert_and_commit() - seen_ids[row_data['id']] = 1 + seen_ids.add(row_data['id']) else: # Non-NULL future id. Save this and insert it later! @@ -279,7 +286,7 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s # Attempt to add any spare rows we've collected for row_data, foreign_ids in deferred_rows: - if not all(_ in seen_ids for _ in foreign_ids): + if not foreign_ids.issubset(seen_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! " @@ -288,7 +295,7 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False, s session.connection().execute( insert_stmt.values(**row_data) ) - seen_ids[row_data['id']] = 1 + seen_ids.add(row_data['id']) session.commit() print_done()