Add COLUMN_TYPE_MAPPING for timedelta #522
Description
Currently trying to create a column with Python type datetime.timedelta results in an error:
>>> from sqlite_utils import Database >>> db = Database("test.db") >>> test_tbl = db['test'] >>> test_tbl.insert({'col1': datetime.timedelta()}) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.10/dist-packages/sqlite_utils/db.py", line 2979, in insert return self.insert_all( File "/usr/local/lib/python3.10/dist-packages/sqlite_utils/db.py", line 3082, in insert_all self.create( File "/usr/local/lib/python3.10/dist-packages/sqlite_utils/db.py", line 1574, in create self.db.create_table( File "/usr/local/lib/python3.10/dist-packages/sqlite_utils/db.py", line 961, in create_table sql = self.create_table_sql( File "/usr/local/lib/python3.10/dist-packages/sqlite_utils/db.py", line 852, in create_table_sql column_type=COLUMN_TYPE_MAPPING[column_type], KeyError: <class 'datetime.timedelta'> The reason this would be useful is that MySQLdb uses timedelta for MySQL TIME columns:
>>> import MySQLdb >>> conn = MySQLdb.connect(host='database', user='user', passwd='pw') >>> csr = conn.cursor() >>> csr.execute("SELECT CAST('11:20' AS TIME)") >>> tuple(csr) ((datetime.timedelta(seconds=40800),),) So currently any attempt to convert a MySQL DB with a TIME column using db-to-sqlite will result in the above error.
I was rather surprised that MySQLdb uses timedelta for TIME columns but I see that this column type is intended for time intervals as well as the time of day so it makes sense.