python sqlite fetchall没有返回正确的数据类型

Question

I am having an issue with having fetchall return being the correct data type. fetchone does work?!?!

con = sqlite3.connect('test.db', detect_types=sqlite3.PARSE_DECLTYPES)

with con:

cur = con.cursor()    
cur.execute("SELECT df1 FROM PLCValues")

rows = cur.fetchall()
#print(rows)
for row in rows:
    print (row)
print(row)

Returns

================= RESTART: C:/Users/zippo/Desktop/Graphit.py =================
(44.64769744873047,)
(44.691650390625,)
(44.691650390625,)
(44.471900939941406,)
(44.64769744873047,)

FETCHONE

con = sqlite3.connect('test.db', detect_types=sqlite3.PARSE_DECLTYPES)

with con:

cur = con.cursor()    
cur.execute("SELECT df1 FROM PLCValues")

rows = cur.fetchone()
#print(rows)
for row in rows:
    print (row)
print(row)

Returns:

================= RESTART: C:/Users/zippo/Desktop/Graphit.py =================
44.64769744873047
44.64769744873047

Answer 1

cur.fetchall() returns a tuple of tuples. According to https://docs.python.org/2/library/sqlite3.html it seems to be returning the correct type. You might want to iterate through individual tuple to get a single element.