最近线上的项目总是会报出数据库连接相关的错误,比如“Command out of Sync”,“Mysql server has gone away”,“Lost databse connection”,“Package sequence out of order”等等,最终解决下来,发现以上错误可以分为两种,一种是和连接丢失有关的,一种是和连接被多个线程(进程)同时使用了有关。 我们项目基于fl...
最近在使用 Flask 中使用 SQLAlchemy 开发程序,一开始好好的,然后使用 uWSGI 部署到线上后,出现了各种 mysql 客户端的问题,如: (_mysql_exceptions.ProgrammingError) (2014, "Commands out of sync; you can't run this command now") NoSuchColumnError: "Could not locate column in row for column 'user...
nr = db.next_result() MySQLdb._exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/home/xeb/Code/Python/fastapivenv/lib/python3.10/site...
version:"3.8"services:backend:build:./backendenvironment:-POSTGRES_USER=fastapi_traefik-POSTGRES_PASSWORD=password-POSTGRES_DB=fastapi_traefik-APP_CONFIG_FILE=localcommand:bash-c'while !</dev/tcp/db/5432; do sleep 1; done; cd backend; echo "RUNNING ALEMBIC MIGRATIONS"; alembic u...
If at some point you write the command commit, that means: "merge my data-changes into main DB data". But if you need some future data, that you can get only after commit (ex. insert into a table, and you need the inserted PKID), then you use the flush command, meaning: "calcul...
init_model() is the type of the event loop that is only commanded with the CLI command for python execution of the additional arguments. 2. FastAPI Routes The fast api is the main package that comes under the separate asyncalchemy for the sqlalchemy user and asyncsessions. ...
command.upgrade(alembic_config(), revision, sql=dry_run) File "/home/mel/.local/lib/python3.8/site-packages/alembic/command.py", line 385, in upgrade script.run_env() File "/home/mel/.local/lib/python3.8/site-packages/alembic/script/base.py", line 582, in run_env util.load_python_...
To put it simply, the migrate_tables function reads the structure of models and recreates it in the database using the SQLAlchemy engine. To run this script, use the python scripts/migrate.py command. The models are now present both in the code and in the database and get_db_session ...
Kafka client is terminated with `OffsetOutOfRangeException` when trying to fetch messages... Last updated: June 1st, 2022 by vikas.yadav ABFS client hangs if incorrect client ID or wrong path used Trying to access an Azure Blob File System (ABFS) path results in a hung command when using...
pyodbc是一个Python编程语言的开源库,用于连接和操作各种数据库。它提供了一个统一的API,使得开发人员可以使用相同的代码来访问不同类型的数据库,如MySQL、Oracle、SQL Server等。 pyodbc过程执行失败可能有多种原因,下面是一些常见的可能原因和解决方法: 数据库连接问题:检查数据库连接字符串是否正确,包括主机名、端口...