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The function uses the Alembic library to create a new version table for a database engine, and adds some basic fields such as version number and creation time. It also updates Alembic's version control file.
Technology Stack : Alembic, SQLAlchemy
Code Type : Function
Code Difficulty : Advanced
def generate_version_table(engine, version_table_name="version_table"):
"""
为指定的数据库引擎创建一个新的版本表。
:param engine: 数据库连接引擎
:param version_table_name: 新版本表的名字,默认为"version_table"
"""
import alembic
from alembic import op
import sqlalchemy
# 定义版本表的名称
table_name = version_table_name
# 创建一个新的版本表
op.create_table(
table_name,
sqlalchemy.Column("version_num", sqlalchemy.String(length=32), primary_key=True),
sqlalchemy.Column("created_time", sqlalchemy.DateTime, default=sqlalchemy.func.now())
)
# 将新版本表添加到Alembic的元数据中
op.alter_table(
table_name,
op.AddColumn("current", sqlalchemy.Boolean, default=True)
)
# 更新Alembic的版本控制文件
op.create_version_table()
print(f"Version table '{table_name}' created successfully.")