如何在 sqlalchemy 迁移脚本或 sqlite 的配置文件中打开“PRAGMA foreign_keys = ON"? [英] How to turn on 'PRAGMA foreign_keys = ON' in sqlalchemy migration script or configuration file for sqlite?

问题描述

在合适的 sqlite 版本中，我们可以通过 'PRAGMA foreign_keys = ON' 来强制执行外键约束.但是，用户无法每次建立连接时都登录数据库.所以我想知道我们如何让它在 sqlalchemy/alembic 的迁移脚本中工作?非常感谢！

In a suitable sqlite version, we can enforce foreign key constraint by 'PRAGMA foreign_keys = ON'. However user can not log in a database every time when making a connection. So I wonder how can we make it working in a migration script in sqlalchemy/alembic? Thanks very much!

推荐答案

参见 外键支持来自 SA SQLite 文档:

See Foreign Key Support from SA SQLite documentation:

import sqlite3

from sqlalchemy.engine import Engine
from sqlalchemy import event

@event.listens_for(Engine, "connect")
def set_sqlite_pragma(dbapi_connection, connection_record):
    if type(dbapi_connection) is sqlite3.Connection:  # play well with other DB backends
       cursor = dbapi_connection.cursor()
       cursor.execute("PRAGMA foreign_keys=ON")
       cursor.close()

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