insert into enterprisecontrol
                (enterprise_id,control_id,time,status)
                SELECT #{enterprise_id},#{control_id},#{time},#{status}
    from DUAL  
where not exists(select enterprisecontrol.enterpriseControl_id from enterprisecontrol where enterprise_id = #{enterprise_id} and control_id = #{control_id} );

可能不管用，不过写了以后明显可以控制