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15 de oct. de 2018 · 首先安裝 Alembic，在終端機(Console)中輸入以下的pip指令安裝。由於Alembic 這個套件是搭配 SQLAlchemy 使用，所以若你的 Python 環境中沒有安裝 SQLAlchemy ...
合并分支. An Alembic merge is a migration file that joins two or more “head” files together. If the two branches we have right now can be said to be a “tree” structure, introducing this merge file will turn it into a “diamond” structure: Alembic 合并是将两个或多个 “head” 文件连接在一起的迁移文件 ...
Alembic 通过这些指令提供了所有基本的数据库迁移操作，这些指令设计得尽可能简单和简约； 大多数这些指令不依赖现有的表元数据。 它们利用一个全局“上下文”来指示如何获得数据库连接（如果有的话；迁移也可以将 SQL/DDL 指令转储到文件）以调用命令。
Operation Reference¶. This file provides documentation on Alembic migration directives. The directives here are used within user-defined migration files, within the upgrade() and downgrade() functions, as well as any functions further invoked by those.. All directives exist as methods on a class called Operations.When migration scripts are run, this object is made available to the script via ...
Auto Generating Migrations ¶. Alembic can view the status of the database and compare against the table metadata in the application, generating the “obvious” migrations based on a comparison. This is achieved using the --autogenerate option to the alembic revision command, which places so-called candidate migrations into our new migrations ...
INTRODUCTION. Alembic is an open computer graphics interchange framework. Alembic distills complex, animated scenes into a non-procedural, application-independent set of baked geometric results. This distillation' of scenes into baked geometry is exactly analogous to the distillation of lighting and rendering scenes into rendered image data.
运行 create 操作后，告诉 Alembic 创建一个新的版本表，并用最新的修订（即 head ）标记它：. # inside of a "create the database" script, first create # tables: # 在“创建数据库”脚本中，首先创建表. my_metadata.create_all(engine) # then, load the Alembic configuration and generate the # version table ...
