(使用 django 1.11.2、python 2.7.10、mysql 5.7.18)
以下 SQL 查询:
SELECT
transaction_transaction.id,
sec_to_time(avg(time_to_sec(extract(HOUR_SECOND from transaction_transaction.transaction_datetime))))
AS average_time_of_day
FROM transaction_transaction
INNER JOIN store_store ON (transaction_transaction.store_id=store_store.id)
INNER JOIN payment_method_card ON (transaction_transaction.card_id=payment_method_card.id)
WHERE (
transaction_transaction.transaction_datetime BETWEEN '2017-08-31 00:00:00' AND '2017-08-31 23:59:59'
AND store_store.company_id=2
AND payment_method_card.profile_id=8
);
运行并返回以下结果(如预期的那样):
+== id ==+== average_time_of_day ==+
|= 9422 =|===== 20:42:22.8695 =====|
(这是从 HeidiSQL 运行的)
通过 Django 做类似的事情(我认为!但显然是错误的):
average_time_of_day = Transaction.objects.raw(
'''
SELECT
transaction_transaction.id,
sec_to_time(avg(time_to_sec(extract(HOUR_SECOND from transaction_transaction.transaction_datetime))))
AS average_time_of_day
FROM transaction_transaction
INNER JOIN store_store ON (transaction_transaction.store_id=store_store.id)
%s
WHERE (
transaction_transaction.transaction_datetime BETWEEN %s AND %s
AND store_store.company_id=%s
%s
);
''',
[
'INNER JOIN payment_method_card ON (transaction_transaction.card_id=payment_method_card.id) ' if profile_pk else '',
start_datetime,
end_datetime,
company_pk,
'AND payment_method_card.profile_id=' + str(profile_pk) if profile_pk else '',
]
)
正在做
print average_time_of_day.query
输出:
SELECT
transaction_transaction.id,
sec_to_time(avg(time_to_sec(extract(HOUR_SECOND from transaction_transaction.transaction_datetime))))
AS average_time_of_day
FROM transaction_transaction
INNER JOIN store_store ON (transaction_transaction.store_id=store_store.id)
INNER JOIN payment_method_card ON (transaction_transaction.card_id=payment_method_card.id)
WHERE (
transaction_transaction.transaction_datetime BETWEEN 2017-08-31 00:00:00 AND 2017-08-31 00:00:00
AND store_store.company_id=2
AND payment_method_card.profile_id=8
);
并且 Django 返回以下错误:
ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''INNER JOIN payment_method_card ON (transaction_transaction.card_id=payment_meth' at line 7")
知道我做错了什么吗?