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python - 使用多个参数格式化字符串，以便 MySQL 可以处理它们

问题描述

我想知道如何格式化 API 返回的字符串，以便 Mysql 可以处理它。

这是我的 API 返回的字符串：bad_string = "History,Romance,Business & Money"

尝试1：

cursor.execute("SELECT * FROM book WHERE scrape_category IN (%s) ORDER BY RAND() LIMIT 15", bad_string)

返回此消息：

Traceback (most recent call last):
  File "C:\PATH", line 23, in <module>
    cursor.execute("SELECT * FROM book WHERE scrape_category IN (%s) ORDER BY RAND() LIMIT 15", bad_string)
  File "C:\PATH\AppData\Roaming\Python\Python37\site-packages\mysql\connector\cursor_cext.py", line 259, in execute
    "Not all parameters were used in the SQL statement")
mysql.connector.errors.ProgrammingError: Not all parameters were used in the SQL statement

尝试2：

bad_string_2 = "'Romance', 'History', 'Business & Money'"

cursor.execute("SELECT * FROM book WHERE scrape_category IN (%s) ORDER BY RAND() LIMIT 15", bad_string_2)

返回此消息：

Traceback (most recent call last):
  File "C:PATH", line 21, in <module>
    cursor.execute("SELECT * FROM book WHERE scrape_category IN (%s) ORDER BY RAND() LIMIT 15", bad_string_2)
  File "C:\PATH\AppData\Roaming\Python\Python37\site-packages\mysql\connector\cursor_cext.py", line 246, in execute
    prepared = self._cnx.prepare_for_mysql(params)
  File "C:\PATH\AppData\Roaming\Python\Python37\site-packages\mysql\connector\connection_cext.py", line 520, in prepare_for_mysql
    raise ValueError("Could not process parameters")
ValueError: Could not process parameters

这有效：

cursor.execute("SELECT * FROM book WHERE scrape_category IN ('Romance', 'History', 'Business & Money') ORDER BY RAND() LIMIT 15")

当我这样做时，查询有效：

cursor.execute("SELECT * FROM book WHERE scrape_category IN ('Romance', 'History', 'Business & Money') ORDER BY RAND() LIMIT 15")

如何格式化字符串并使 MySQL 返回结果？

标签： pythonmysqlstringwhere-in

解决方案

尝试一些这样的：

filter ="History,Romance,Business & Money".split(',')
sqlcommand = "SELECT * FROM book WHERE scrape_category IN ({0})".format(
    ', '.join(['%s'] * len(filter)))
print(sqlcommand)
cursor.execute(sqlcommand, filter)

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