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mysql中删除字符串或字段中空格函数

Jun 07, 2016 pm 05:51 PM
Remove spaces

在mysql中提供了ltrim,rtrim函数来删除字符的首毛空格那么如果我要删除字符如\"abc fdsa\"应该如何做来,下面我们来看教程

ltrim 函数

 代码如下 复制代码
> concat('.', ltrim(' ddd '), '.'); 

rtrim函数

 代码如下 复制代码
mysql> select concat('.', rtrim(' ddd '), '.'); 

trim 字符串函数,实在是强大。它不仅能消除字符串首尾部的空格,还可以消除我们指定的任意字符。ltrim(), rtrim() 只是它的一个功能子集。

 

 代码如下 复制代码
UPDATE `tran`
SET `status` = '1'
WHERE trim( replace( `msg`, 'rn', ' ' ) ) = '我爱你';

数据中的回车换行等替换成空格之后再trim掉,就达到目的了,虽然不是特别完美,但是由于没办法在用户录入的时候控制,所以只能出此下策,好在MySQL内置函数的效率还是很有保证的

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