尝试使用mysql python连接器执行准备好的语句时出现NotImplementedError [英] I get NotImplementedError when trying to do a prepared statement with mysql python connector

问题描述

我想使用准备好的语句使用python将数据插入MySQL DB(版本5.7)，但是我一直收到NotImplementedError. 我在这里关注文档: https://dev.mysql.com/doc/connector-python/zh-CN/connector-python-api-mysqlcursorprepared.html

I want to use prepared statements to insert data into a MySQL DB (version 5.7) using python, but I keep getting a NotImplementedError. I'm following the documentation here: https://dev.mysql.com/doc/connector-python/en/connector-python-api-mysqlcursorprepared.html

使用python-2.7和mysql-connector-python库的8.0.11版:

Using Python 2.7 and version 8.0.11 of mysql-connector-python library:

pip show mysql-connector-python
---
Metadata-Version: 2.1
Name: mysql-connector-python
Version: 8.0.11
Summary: MySQL driver written in Python
Home-page: http://dev.mysql.com/doc/connector-python/en/index.html

这是我正在运行的python脚本的纯净版本(没有特定的主机名，用户名，密码，列或表):

This is a cleaned version (no specific hostname, username, password, columns, or tables) of the python script I'm running:

import mysql.connector
from mysql.connector.cursor import MySQLCursorPrepared

connection = mysql.connector.connect(user=username, password=password,
                                      host='sql_server_host',
                                      database='dbname')
print('Connected! getting cursor')
cursor = connection.cursor(cursor_class=MySQLCursorPrepared)
select = "SELECT * FROM table_name WHERE column1 = ?"
param = 'param1'
print('Executing statement')
cursor.execute(select, (param,))
rows = cursor.fetchall()
for row in rows:
    value = row.column1
print('value: '+ value)

运行此错误消息:

Traceback (most recent call last):
  File "test.py", line 18, in <module>
    cursor.execute(select, (param,))
  File "/home/user/.local/lib/python2.7/site-packages/mysql/connector/cursor.py", line 1186, in execute
    self._prepared = self._connection.cmd_stmt_prepare(operation)
  File "/home/user/.local/lib/python2.7/site-packages/mysql/connector/abstracts.py", line 969, in cmd_stmt_prepare
    raise NotImplementedError
NotImplementedError

推荐答案

如果已启用，则默认启用，并且已准备撰写本文时，CEXT不支持这些语句.

CEXT will be enabled by default if you have it, and prepared statements are not supported in CEXT at the time of writing.

您可以在连接时通过添加关键字参数use_pure=True来禁用CEXT，如下所示:

You can disable the use of CEXT when you connect by adding the keyword argument use_pure=True as follows:

connection = mysql.connector.connect(user=username, password=password,
                                     host='sql_server_host',
                                     database='dbname',
                                     use_pure=True)

对CEXT中准备好的语句的支持将包含在即将发布的mysql-connector-python 8.0.17版本中(根据 MySQL错误报告).因此，一旦可用，至少升级到8.0.17即可解决此问题，而无需use_pure=True.

Support for prepared statements in CEXT will be included in the upcoming mysql-connector-python 8.0.17 release (according to the MySQL bug report). So once that is available, upgrade to at least 8.0.17 to solve this without needing use_pure=True.

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