有没有办法将 mysql-connector-python 中的“pool_reset_connection"与 MariaDB 10.4.7 一起使用? [英] Is there a way to use 'pool_reset_connection' from mysql-connector-python with MariaDB 10.4.7?

问题描述

我想将我的 python 程序从普通连接更改为连接池，以便在几个小时内没有发送查询时数据库连接不会丢失，并且数据库不会被一堆查询淹没使用高峰期.

I want to change my python program from a normal connection to a Connection Pool so that the database connection doesn't get lost when no queries are sent for some hours, as well as the database not being overwhelmed with a bunch of queries at once at peak usage.

我正在使用 Python 3.7.4、mysql-connector-python 8.0.17 和 MariaDB 10.4.7.当我使用普通连接时它工作正常，但 MariaDB 显然不支持 mysql.connector.pooling.MySQLConnectionPool

I'm using Python 3.7.4, mysql-connector-python 8.0.17, and MariaDB 10.4.7. It works fine when I use a normal connection, but MariaDB apparently doesn't support the pool_reset_session setting of mysql.connector.pooling.MySQLConnectionPool

在我的代码开始时，它会尝试创建尚不存在的数据库，这导致了我得到的错误.

At the start of my code, it tries to create the database if it doesn't yet exist, and that is causing the errors I get.

import mysql.connector as mariadb
from mysql.connector import errorcode
from mysql.connector import pooling

cnx = mariadb.pooling.MySQLConnectionPool(user='root', password='password', host='localhost', 
                                          pool_name='connectionpool', pool_size=10, pool_reset_session=True)

try:
    db = cnx.get_connection()
    cursor = db.cursor()
    cursor.execute("CREATE DATABASE IF NOT EXISTS tests")
    print("Created database")
except mariadb.Error as err:
    print(f"Failed creating database: {err}")
finally:
    print("Finally (create)")
    db.close()

我希望这个片段只会创建数据库 tests 但我得到了以下两个错误:

I expected that this snippet would just create the database tests but instead I got the following two errors:

mysql.connector.errors.NotSupportedError:MySQL 5.7.2 及更早版本不支持 COM_RESET_CONNECTION.

还有

mysql.connector.errors.OperationalError: 1047 (08S01): Unknown command

从追溯日志来看，这似乎是由于尝试在第 17 行执行 db.close() 造成的.

From the traceback logs, it looks like this gets caused by trying to execute db.close() in line 17.

带有回溯的完整输出:https://pastebin.com/H3SAvA9N

我在问我能做些什么来解决这个问题，以及是否有可能在 MariaDB 10.4.7 中使用这种连接池(我很困惑，因为它说 MySQL <= 5.7.2 不支持即使我使用 MariaDB 10.4.7，使用后也会重置连接)

I am asking what I can do to fix this and if it's possible at all to use this sort of connection pooling with MariaDB 10.4.7 (I get confused because it says that MySQL <= 5.7.2 doesn't support this reset of connections after use even though I use MariaDB 10.4.7)

我还发现 MariaDB Connector/J 确实提供了这样一个选项，称为 useResetConnection，但我不想仅仅为了这个功能而学习 Java.

I also found out that MariaDB Connector/J does provide such an option, called useResetConnection but I don't want to learn Java just for this feature.

推荐答案

我在使用 mariaDB 的 mysql-connector-python 时遇到了同样的问题，我将 mysql-connector-python 版本降级到 8.0.12，它对我有用

I was facing the same issue with mysql-connector-python for mariaDB, and I downgraded mysql-connector-python version to 8.0.12 and it worked for me

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