Mysql按VARCHAR字段插入订单号 [英] Mysql Insert Order Number By VARCHAR Field

问题描述

我有一个关于按特定订单类型插入行订单号的问题.

I have a question about inserting row order number by spesific order type.

Products 表有 OrderNumber 字段.我想通过其名称以编程方式将新行添加到适当的 OrderNumber.如果引用列是整数，它必须很容易

Products table has OrderNumber field. I want to programaticly add new line to appropriate OrderNumber by its name. If the reference column would be integer it has to be easy like that

update products set OrderNumber=OrderNumber+1 where Price>555

varchar 字段是否有类似的方法

Is there similar way for varchar field like

update products set OrderNumber=OrderNumber+1 where Name>'bla%'

谢谢

推荐答案

可以使用 STRCMP('text', 'text2')

You can use STRCMP('text', 'text2')

update products 
set OrderNumber=OrderNumber+1 
where STRCMP(Name, 'bla') = 1;

我误解了你的意思.你能试试这样的吗?

I missunderstood your point. Can you try something like this?

SET @rownum:=0;
update 
set OrderNumber=@rownum:=@rownum + 1
from products
order by Name;

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