UPDATE zanbao.t_order 
SET 
    step = CASE stat
        WHEN '2' THEN '1'
        WHEN '4' THEN '2'
    END,
    sh_person = CASE stat
        WHEN '4' THEN '100006'
        ELSE sh_person
    END,
    sh_date = CASE stat
        WHEN '4' THEN NOW()
        ELSE sh_date
    END,
    sh_remarks = CASE stat
        WHEN '4' THEN ''
        ELSE sh_remarks
    END,
    qr_person = CASE stat
        WHEN '2' THEN '100006'
        ELSE qr_person
    END,
    qr_date = CASE stat
        WHEN '2' THEN NOW()
        ELSE qr_date
    END,
    qr_remarks = CASE stat
        WHEN '2' THEN ''
        ELSE qr_remarks
    END,
    stat = CASE stat
        WHEN '2' THEN '3'
        WHEN '4' THEN '5'
    END
WHERE
    stat IN ('2' , '4')
        AND id = 'D201504090033'