Python pymysql 库中如何绑定参数？

Question

如此处 https://peps.python.org/pep-0249/#paramstyle 所述，在 MySql 中应该可以使用关键字语法绑定参数，如下所示：email=:email。这不同于使用未命名的占位符语法，例如 email=%s.

但是这段代码不起作用：

import pymysql 
con = pymysql.connect(host='localhost', user='root', password=pw, database=db_name, port=4306)

stmt = "INSERT INTO `test_table` (`email`, `password`) VALUES (:email, :password)"
with con.cursor() as cursor:
    # Create a new record
    cursor.execute(stmt, {'email': "FOO", 'password': "BAR"})
con.commit()

甚至没有添加

pymysql.paramstyle = 'named'

在顶部。

错误是

(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 ':email, password=:password)' at line 1")

但不幸的是，我找不到这样的文档（此页面未记录任何内容.. https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html）

正确的语法是什么？

谢谢！

Answer 1

https://pymysql.readthedocs.io/en/latest/modules/cursors.html 说：

If args is a list or tuple, %s can be used as a placeholder in the query. If args is a dict, %(name)s can be used as a placeholder in the query.

尽管 :name 占位符格式在您引用的 PEP 中，但 pymysql 包似乎并未实现该格式。

这应该有效：

stmt = "INSERT INTO `test_table` (`email`, `password`) VALUES (%(email)s, %(password)s)"
with con.cursor() as cursor:
    # Create a new record
    cursor.execute(stmt, {'email': "FOO", 'password': "BAR"})

Python pymysql 库中如何绑定参数？

How do you bind parameters in the Python pymysql library?

python

mysql

sql