359a34011f5e_add_default_value_in_referred_row_in_.py 文件源码

def upgrade():
    ### 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=True,
               existing_server_default=sa.text(u"''"))
    ### end Alembic commands ###