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mysql - 计数字母(mysql - count letters)

 谁能告诉我如何计算MySQL中字符串中的字母？ 
 

 例如： 
 

SELECT numberOfLetters('abc123 def')

 

 将返回6 
 

 通过信件，我的意思是AZ和az。 
 

 numberOfLetters当然不是有效的SQL，但它说明了我想要做的事情。 
 

 我正在使用的MySQL版本是5.5.27 

Can anyone tell me how to count the letters in a string in MySQL?
 

For example:
 

SELECT numberOfLetters('abc123 def')

 

would return 6
 

By letter, I mean A-Z and a-z.
 

numberOfLetters is not valid SQL of course, but it illustrates what I am trying to do.
 

The version of MySQL that I'm using is 5.5.27

原文：https://stackoverflow.com/questions/13467901
更新时间：2021-07-11 17:07

最满意答案

 我不认为它是AS3还是AS2与它有关。 
 

 从Web浏览器的角度来看，它们都是一个黑盒子，上面写着“Flash Player插件”。 您一次只能安装一个版本的插件，因此即使您有AS2和AS3 swf，Web浏览器也会看到它有2个“Flash播放器插件版本10”的实例 
 

 将你想要做的事情归结为： 
 

     
 
  1.  创建一个页面： 
    2.  
 
  2.  坚持使用swf 
    3.  
 
  3.  在页面中添加一个div并使用CSS定位将其“覆盖”在另一个swf上 
    4.  
 
  4.  坚持另一个瑞士法郎。 
    5.  

 

 那么，这有用吗？ - 否是，非常好，但你必须在嵌入式flash对象上设置wmode="transparent" （感谢评论中的grapefrukt）。 
 

 我跑了一个测试：这是我的源代码： 
 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <style type="text/css" media="screen">
            DIV{ width: 300px; height; 300px;}
            #background{ border: 1px solid green; background-color: green; z-index: 0; }
            #foreground{ border: 1px solid red; background-color: red; z-index: 50; }
        </style>
    </head>
    <body>
        <div id="background">
            <embed height="208" width="208" quality="high" bgcolor="#fff" src="bgswf.swf" type="application/x-shockwave-flash" wmode="transparent"/>
        </div>  

        <div id="foreground" style="position: absolute; left: 30px; top: 30px;">
            <embed height="208" width="208" quality="high" bgcolor="#fff" src="fgswf.swf" type="application/x-shockwave-flash" wmode="transparent"/>
        </div>  

    </body>
</html>

 

 结果： 
 

 没有wmode=transparent ，在firefox和IE中是不一致的，并且很小。 有了它，你在IE和Firefox中的确应该做到了。 
 swf文件的行为（从布局的角度来看）就好像它们只是图像一样。 这个很酷。 

I wouldn't think that whether it's AS3 or AS2 has anything to do with it.
 

From the point of view of the web browser, they are both a black box that says "Flash Player Plugin". You can only have one version of the plugin installed at one time, so even though you have an AS2 and an AS3 swf, the web browser just sees that it has 2 instances of "Flash player plugin version 10"
 

To boil it down what you seem to be trying to do is:
 

     
 
  1. Create a page:
    2.  
 
  2. Stick a swf in it
    3.  
 
  3. Add a div to the page and use CSS positioning to put it "over" the other swf
    4.  
 
  4. Stick another swf in that div.
    5.  

 

So, does this work? - No Yes, very well, but you must set wmode="transparent" on your embedded flash objects (thanks grapefrukt in comments).
 

I ran a test: here's my source code:
 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <style type="text/css" media="screen">
            DIV{ width: 300px; height; 300px;}
            #background{ border: 1px solid green; background-color: green; z-index: 0; }
            #foreground{ border: 1px solid red; background-color: red; z-index: 50; }
        </style>
    </head>
    <body>
        <div id="background">
            <embed height="208" width="208" quality="high" bgcolor="#fff" src="bgswf.swf" type="application/x-shockwave-flash" wmode="transparent"/>
        </div>  

        <div id="foreground" style="position: absolute; left: 30px; top: 30px;">
            <embed height="208" width="208" quality="high" bgcolor="#fff" src="fgswf.swf" type="application/x-shockwave-flash" wmode="transparent"/>
        </div>  

    </body>
</html>

 

Results:
 

Without wmode=transparent, is inconsistent and minorly broken in firefox and IE. With it, does exactly what you think it should in both IE and firefox.
 The swf files behave (from a layout point of view) as if they are just images. It's cool.

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