Python MySQL Parameter Query Programming Error: 1064 (42000)

Question

我想使用 python 程序查询 MySQL 表，但出现此错误：

ProgrammingError: 1064 (42000): 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 ''10' OFFSET '0'' at line 1

令人困惑的是，当我不使用变量时，查询运行完美，如下所示：

cur = connection.cursor()
query = "SELECT * FROM DB.Table LIMIT 10 OFFSET 0"

cur.execute(query)

records = cur.fetchall()

for record in records:
    print(record)

但我需要 select 逐批处理数据，并且我必须在 for 循环中执行上述命令。我需要定义变量。但是我得到了错误 1064。这是有错误的代码：

i = 0
p = str(i)
j = 10
q = str(j)

cur = connection.cursor()
query = "SELECT * FROM DB.Table LIMIT %s OFFSET %s"

cur.execute(query,(q,p,))

records = cur.fetchall()

for record in records:
    print(record)

感谢您的帮助。

Answer 1

您可以使用 cur.execute(query % (q,p)) 或

query = "SELECT * FROM DB.Table LIMIT {} OFFSET {}"
cur.execute(query.format(q, p))

Answer 2

简单地说，不要将参数化值转换为字符串，因为错误显示单引号：

i = 0
j = 10

cur = connection.cursor()
query = "SELECT * FROM DB.Table LIMIT %s OFFSET %s"

cur.execute(query, (j, i))

Python MySQL Parameter Query Programming Error: 1064 (42000)

Python MySQL Parameter Query Programming Error: 1064 (42000)

python

mysql

sql

limit

offset