我正在用Python 3编写一些脚本,需要从PostgreSQL数据库中读取数据。在一种情况下,我需要将一个查询追加到另一个查询,同时还要防止SQL注入。我尝试了其他方法(格式字符串,sql.SQL),但未成功。下面是我使用的代码:
data = {
'id': 14,
'user_id': (16, 'Administrator'),
'from_date': datetime.datetime(2019, 1, 6, 5, 45, 15),
'to_date': datetime.datetime(2020, 5, 3, 5, 45, 15),
'state': 'to_be_review',
'language': 'english',
}
query = " AND hr.unit_identification_code_id IN (%s)" % ','.join(map(str, uic_ids))
user_id = data.get('user_id') and data.get('user_id')[0] or 0
if uic_ids:
if data.get('state') != 'reject_submit':
self._cr.execute(sql.SQL("""
SELECT
elh.id
FROM
employee_log_history elh
LEFT JOIN
hr_employee hr
ON elh.hr_employee_id = hr.id
WHERE
elh.create_date >= %s
AND elh.create_date <=%s
AND elh.create_uid = %s
AND elh.state = %s {}
""").format(sql.Identifier(query)), (data.get('from_date'), data.get('to_date'), user_id, data.get('state'),)
)
但是当我运行脚本作为结果时,我得到的第一个查询用双引号引起以下错误:
psycopg2.ProgrammingError: syntax error at or near "" AND hr.unit_identification_code_id IN (33,34,35,36,37,38,39,40,41,42,49,47,60,61,63,64,62,43,46,58,59,50,57,48,44,51,52)""
LINE 13: ... AND elh.state = 'to_be_review' " AND hr.u...
现在,我想知道是否有可能执行此查询并阻止SQL注入并在第二个查询中追加第一个查询?
sql.Identifier用于引用标识符,例如表名或列名,而不是用于适配SQL块。要执行所需的操作,请使用sql.SQL。
这是一个简化的示例,在WHERE
子句中添加了附加条件:
import psycopg2
from psycopg2 import sql
conn = psycopg2.connect(database='test')
cur = conn.cursor()
stmt1 = "SELECT name, password FROM users WHERE name = %s"
stmt2 = ' AND {} = %s'
composed = sql.SQL(stmt2).format('password')
print(composed)
Composed([SQL(' AND '), Identifier('password'), SQL(' = %s')])
print(repr(composed.as_string(cur)))
' AND "password" = %s'
cur.mogrify(stmt1 + composed.as_string(cur), ('Alice', 'secret'))
b'SELECT name, password FROM users WHERE name = \'Alice\' AND "password" = \'secret\''
混合字符串(stmt
)和对象(composed
)感觉有些古怪。您可能想要在代码中一致地使用对象,但这取决于您。