如何增加数量到数据库表字段? [英] How to add quantity to database table field?

问题描述

示例:

文字框= 20
数量(存储在表RawMat中)= 40

新数量应为= 60

example:

textbox = 20
quantity (stored in table RawMat) = 40

new quantity should be = 60

推荐答案

尝试UPDATE语句:

Try an UPDATE statement:

UPDATE RawMat SET quantity = quantity + 20 WHERE Id=1

Try:

Try:

-- @addNewQuantity is the new value sent for update. 20 here. 
UPDATE 
  MtTable
SET
  Quantity = Quantity + @addNewQuantity

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