flask server

server/flask/application/backend/data/dao_file_metadata.py

@@ -0,0 +1,33 @@
+from .db import get_db
+from .data_models import DataError
+from sqlite3 import IntegrityError
+
+_INSER_METADATA_SQL = "INSERT INTO file_metadata(file_key,metadata) "\
+"VALUES(:file_key, :metadata)"
+_DELETE_METADATA_SQL = "DELETE FROM file_metadata WHERE file_key=:file_key"
+def insert_metadata(metadata: dict):
+    db = get_db()
+    db_cursor = db.cursor()
+
+    delete_params = map(lambda key: {'file_key':key}, metadata.keys())
+    delete_params = list(delete_params)
+    db_cursor.executemany(_DELETE_METADATA_SQL, delete_params)
+    
+    insert_params = map(lambda item: {'file_key':item[0], 'metadata':item[1]}, metadata.items())
+    insert_params = list(insert_params)
+
+
+    db_cursor.executemany(_INSER_METADATA_SQL, insert_params)
+    db.commit()
+
+def get_metadata(file_key: str):
+    db = get_db()
+    db_cursor = db.cursor()
+    db_cursor.execute("SELECT metadata FROM file_metadata WHERE file_key=:file_key",{"file_key":file_key})
+    rows = db_cursor.fetchone()
+
+    if (rows is None):
+        return dict()
+    
+    converted_tuple_array = map(lambda metadata: (file_key, metadata), rows)
+    return dict(converted_tuple_array)