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在MYSQL语法中使用trim函数删除两侧字符_MySQL

Jun 01, 2016 pm 01:37 PM
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在实际开发中,你总是会遇到这种情况

在MYSQL语法中使用trim函数删除两侧字符_MySQL

或者遇到这种情况

在MYSQL语法中使用trim函数删除两侧字符_MySQL

 

  数据多了也会令你抓狂,如果还在用select fields from table where like '/%' 绝对是一个吃力不讨好的做法,那么,仔细研究MYSQL自带函数那绝对是首要工作。我第一时间就是想到,PHP函数中的trim是不是也可能用到mysql中呢,回答是肯定的。你可以从MYSQL手册中找到,当然,你可以百度一下,我下面说的与前人相同。

 

[sql] 
SELECT *,trim(LEADING '/' FROM `path`) as paths FROM `ts_back_pic` limit 10

隆重介绍第一个,LEADING,可以删除左侧指定的字符以及字符串

 

在MYSQL语法中使用trim函数删除两侧字符_MySQL

 

 

[sql] 

SELECT *,trim(TRAILING '/' FROM `path`) as paths FROM `ts_back_pic` limit 10

 

第二个,可以删除右侧的指定字符以及字符串

在MYSQL语法中使用trim函数删除两侧字符_MySQL
 

 

[sql] 

SELECT *,trim(BOTH '/' FROM `path`) as paths FROM `ts_back_pic` limit 10

 

第三个,可以删除两侧的指定字符以及字符串

在MYSQL语法中使用trim函数删除两侧字符_MySQL
 

最重要的,和PHP函数有区别的是,trim在PHP函数中是删除多个字符的,而在MYSQL中删除的却是字符串

在MYSQL语法中使用trim函数删除两侧字符_MySQL

 

来个简单点的

 

[sql]

SELECT *,trim(`path`) as paths FROM `ts_back_pic` limit 10;

删除两侧空格

 

来个综合复杂型的

 

[sql] 

SELECT *, trim(BOTH '/r/n' FROM trim(`path`)) as paths FROM `ts_back_pic` limit 10;

环境:一个空格后再回车了一下,要删除空格+回车
 

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