Update readme

README.md

@@ -11,13 +11,35 @@
 
 # Migrate DB
 
+## Export WGdaten
+
+**ATTENTION:** Office and Python versions have to be both 64-bit or both 32-bit!
+
+This will export all tables from the MS Access file `WGDATEN.accdb`
+as csv files to the directory `TABLES_DIR`.
+
+```shell
+cd wgmaster
+python3 export.py WGDATEN.accdb -o TABLES_DIR
+cd..
+```
+
+## Generate PLZ
+
+This will generate `data/90.plz.sql`.
+
 ```shell
 cd data
 python3 plz.py
 cd ..
+````
+
+## Migrate
+
+```shell
 cd wgmaster
-python3 migrate.py -q IN_DIR OUT_DIR -d DB.sqlite3
-python3 import.py OUT_DIR NEW.sqlite3
+python3 migrate.py -q TABLES_DIR MIGRATE_DIR -d DB.sqlite3
+python3 import.py MIGRATE_DIR NEW.sqlite3
 cd ..
 ```
 

wgmaster/export.py

@@ -28,7 +28,7 @@ def convert(tbl: str, name: str, a: Any) -> str:
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('-o', '--output', default='tables')
-    parser.add_argument('wgdaten')
+    parser.add_argument('wgdaten', metavar='WGDATEN')
     args = parser.parse_args()
 
     os.makedirs(args.output, exist_ok=True)