6068a3cf95bf_remigrate_again.py 文件源码

def downgrade():
    ### commands auto generated by Alembic - please adjust! ###
    op.alter_column('statistic_visitor', 'referred',
               existing_type=mysql.VARCHAR(collation=u'utf8_unicode_ci', length=128),
               nullable=False,
               existing_server_default=sa.text(u"''"))
    ### end Alembic commands ###