41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
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"""add features to product
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Revision ID: abcd1237_add_features_to_product
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Revises: 63d5e2868229
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Create Date: 2025-12-07 21:30:00.000000
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"""
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from alembic import op
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import sqlalchemy as sa
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from sqlalchemy.engine import reflection
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# revision identifiers, used by Alembic.
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revision = 'abcd1237_add_features_to_product'
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down_revision = '63d5e2868229'
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branch_labels = None
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depends_on = None
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def upgrade():
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# ### commands auto generated by Alembic - please adjust! ###
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# 检查列是否已存在
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bind = op.get_bind()
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inspector = reflection.Inspector.from_engine(bind)
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columns = inspector.get_columns('product')
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column_names = [column['name'] for column in columns]
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# 只有当列不存在时才添加
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if 'features' not in column_names:
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with op.batch_alter_table('product', schema=None) as batch_op:
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batch_op.add_column(sa.Column('features', sa.Text(), nullable=True, comment='产品功能特性'))
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# ### end Alembic commands ###
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def downgrade():
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# ### commands auto generated by Alembic - please adjust! ###
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with op.batch_alter_table('product', schema=None) as batch_op:
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batch_op.drop_column('features')
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# ### end Alembic commands ###
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