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43 lines
1.0 KiB
Python
43 lines
1.0 KiB
Python
"""2.2.15
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为下载历史增加海报字段
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Revision ID: a8c4e2f6b1d9
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Revises: f7b2d5c9a301
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Create Date: 2026-08-03
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"""
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from alembic import op
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import sqlalchemy as sa
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revision = "a8c4e2f6b1d9"
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down_revision = "f7b2d5c9a301"
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branch_labels = None
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depends_on = None
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def _has_column(table_name: str, column_name: str) -> bool:
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"""检查数据表是否已存在指定字段。"""
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inspector = sa.inspect(op.get_bind())
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if table_name not in inspector.get_table_names():
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return False
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return any(
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column["name"] == column_name
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for column in inspector.get_columns(table_name)
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)
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def upgrade() -> None:
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"""为下载历史增加可空海报字段。"""
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if not _has_column("downloadhistory", "poster"):
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op.add_column(
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"downloadhistory",
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sa.Column("poster", sa.String(), nullable=True),
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)
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def downgrade() -> None:
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"""移除下载历史海报字段。"""
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if _has_column("downloadhistory", "poster"):
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op.drop_column("downloadhistory", "poster")
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