我一直在尝试使用 Flexible Environments (vm:true) 连接到 ClouSQL

但是当我使用以下方式上传我的应用时:

gcloud preview app deploy --version MYVERSION

抛出一个错误:

OperationalError: (2013, 'Lost connection to MySQL server during query')

我发现这可能是因为查询太大，但我认为情况并非如此，因为当我不使用带有 MySQLdb 的灵活环境时，它可以在本地和生产环境中运行。

我的代码:

import os
import logging
import pymysql

class MySQL(object):
    '''
    classdocs
    '''
    # TO INSTALL LOCAL DB: http://stackoverflow.com/questions/30893734/no-module-named-mysql-google-app-engine-django


    @classmethod
    def getConnection(cls):
        # When running on Google App Engine, use the special unix socket
        # to connect to Cloud SQL.
        if os.getenv('SERVER_SOFTWARE', '').startswith('Google App Engine/'):
            logging.debug('PROJECT [%s], INSTANCE[%s] - USER [%s] - PASS [%s], SCHEMA [%s]',
                          os.getenv('CLOUDSQL_PROJECT'),
                          os.getenv('CLOUDSQL_INSTANCE'),
                          os.getenv('CLOUDSQL_USER'),
                          os.getenv('CLOUDSQL_PASS'),
                          os.getenv('CLOUDSQL_SCHEMA'))

            db = pymysql.connect(unix_socket='/cloudsql/APP:REGION:INSTANCENAME')
                    #os.getenv('CLOUDSQL_PROJECT'),
                    #os.getenv('CLOUDSQL_INSTANCE')), 
                    #user=os.getenv('CLOUDSQL_USER'),
                    #passwd=os.getenv('CLOUDSQL_PASS'),  
                    #db=os.getenv('CLOUDSQL_SCHEMA'))
        # When running locally, you can either connect to a local running
        # MySQL instance, or connect to your Cloud SQL instance over TCP.
        else:
            db = pymysql.connect(host=os.getenv('DBDEV_HOST'), user=os.getenv('DBDEV_USER'), 
                                 passwd=os.getenv('DBDEV_PASS', ''), db=os.getenv('DBDEV_SCHEMA'))

        return db

对此有什么想法吗？

谢谢!

最佳答案

查看/etc/mysql/目录下的my.cnf 并更改参数ma​​x_allowed_pa​​cket 并将值设置得更高。那么你必须重启数据库

您也可以像这样通过 SQL 更改此值:

MariaDB [yourSchema]> show GLOBAL variables like 'max_allowed_packet';
+--------------------+---------+
| Variable_name      | Value   |
+--------------------+---------+
| max_allowed_packet | 2097152 |
+--------------------+---------+
1 row in set (0.00 sec)

MariaDB [yourSchema]> SET GLOBAL max_allowed_packet=2*2097152;
Query OK, 0 rows affected (0.00 sec)

MariaDB [yourSchema]> show GLOBAL variables like 'max_allowed_packet';
+--------------------+---------+
| Variable_name      | Value   |
+--------------------+---------+
| max_allowed_packet | 4194304 |
+--------------------+---------+
1 row in set (0.00 sec)

MariaDB [yourSchema]>

MariaDB 手册:

max_allowed_packet

Description:

Maximum size in bytes of a packet or a generated/intermediate string. The packet message buffer is initialized with the value from net_buffer_length, but can grow up to max_allowed_packet bytes. Set as large as the largest BLOB, in multiples of 1024. If this value is changed, it should be changed on the client side as well. See slave_max_allowed_packet for a specific limit for replication purposes.

Commandline: --max-allowed-packet=#

Scope: Global

Dynamic: Yes

Data Type: numeric Default Value: 1048576 (1MB) <= MariaDB 10.1.6, 4M >= MariaDB 10.1.7, 1073741824 (1GB) (client-side)

Range: 1024 to 1073741824

关于python - GAE Python - 操作错误 : (2013, 'Lost connection to MySQL server during query')，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38042300/