Sqlite3 'executemany' 和 UPDATE 和 INSERT 使用 python 字典键不一样？

Question

I have two sqlite queries that use executemany to insert and update data sets from a python dictionary. With the insert query the dictionary.values() as the executemany second argument works perfectly, but with the update I do not get anything updated. Can someone please shed some light on why there is a differrence?
Insert code sample:

query = "INSERT OR REPLACE INTO farm_tb(farm_id, farm)\
           VALUES(:frmid, :frm)"
cur.executemany(query, arr.values())
conn.commit()

Update sample:

query = ("UPDATE emp_log_tb SET syncstatus=syncstatus WHERE log_id=log_id", (':syncstatus', ':logid'))
 cur.executemany(query, arr.values())
 conn.commit()

Both data sets looks similar:
insert data:

{'0': {'farmid': '4', 'farm': 'farm1'}, '1': {'farmid': '3', 'farm': 'farm6'}}

update data:

{'0': {'logid': '1', 'syncstatus': 1}, '1': {'logid': '2', 'syncstatus': 1}, '2': {'logid': '3', 'syncstatus': 1}, '3': {'logid': '4', 'syncstatus': 1}, '4': {'logid': '5', 'syncstatus': 1}}

Answer 1

That update statement just sets every row's syncstatus to its current value, because log_id = log_id is always true (Unless it's a NULL , of course). Plus you're assigning a tuple to query , not a string. Not sure what executemany() does with that.

You want something like

cur.executemany("UPDATE emp_log_tb SET syncstatus=:syncstatus WHERE log_id=:log_id", arr.values())

Note the named parameters in the UPDATE like the ones in the INSERT .

Answer 2

"UPDATE emp_log_tb SET syncstatus=syncstatus WHERE log_id=log_id", (':syncstatus', ':logid')应该是UPDATE emp_log_tb SET syncstatus=:syncstatus WHERE log_id=:log_id