mapper中批量更新sql

 
  
        UPDATE ins_attachment
        
   
    
     
     
       when id=#{i.id} then #{i.reservationId} 
      
     
    
    
     
     
       when id=#{i.id} then #{i.fileDesc} 
      
     
    update_time = now() 
  
        where
        
  
    id=#{i.id}