python - ％混淆python原始sql查询

在this SO question之后，我正在尝试使用python中的以下原始sql命令来“截断”与某个django应用程序相关的所有表:

cursor.execute("set foreign_key_checks = 0")
cursor.execute("select concat('truncate table ',table_schema,'.',table_name,';') as sql_stmt from information_schema.tables where table_schema = 'my_db' and table_type = 'base table' AND table_name LIKE 'some_prefix%'")
for sql in [sql[0] for sql in cursor.fetchall()]:
    cursor.execute(sql)
cursor.execute("set foreign_key_checks = 1")

las，我收到以下错误:

C:\dev\my_project>my_script.py
Traceback (most recent call last):
  File "C:\dev\my_project\my_script.py", line 295, in <module>
    cursor.execute(r"select concat('truncate table ',table_schema,'.',table_name,';') as sql_stmt from information_schema.tables where table_schema = 'my_db' and table_type = 'base table' AND table_name LIKE 'some_prefix%'")
  File "C:\Python26\lib\site-packages\django\db\backends\util.py", line 18, in execute
    sql = self.db.ops.last_executed_query(self.cursor, sql, params)
  File "C:\Python26\lib\site-packages\django\db\backends\__init__.py", line 216, in last_executed_query
    return smart_unicode(sql) % u_params
TypeError: not enough arguments for format string

%中的LIKE是否引起麻烦？我该如何解决？

最佳答案

你有没有尝试过 ％％？这用Python字符串格式引用％。