SQL中我们会见到很多的匹配符,下面解释一下 % 代表零个或者多个任意字符 _ 代表一个任意字符 [] 指定范围内的任意单个字符 [^] 不在指定范围内的任意单个字符 带有匹配符的字符串必须使用引号引起来,例如下面的示例: LIKE 'BR%'返回以“BR”开始的任意字符串. LIKE 'Br%'返回以“Br”开始的任意字符中. LIKE '%een'返回以“een”结束的任意字符串. LIKE '%en%'返回包含“en”的任意字符串. liKE 'en'返回以“en”结束的三个字符的字符串.
we have four specific casting operators:dynamic_cast, reinterpret_cast, static_cast and const_cast. Their format is to follow the new type enclosed between angle-brackets (<>) and immediately after, the expression to be converted between parentheses
学习此连接的总结http://developer.51cto.com/art/201009/226158.htmcss样式表中四种属性选择器1> 简易属性 tag[class]{ font-weight:bold } It will affect all tag with any class. e.g. <h2 class="old" > or <h2 class="new">2>精确属性值 a[href="http:/
JavaScript中四种不同的属性检测方式比较 1. 用in方法 var o = {x:1}; "x" in o; //true "y" in o; //false "toString" in o; //true,继承属性可以被检测到 "toString" in Object.prototype; //true,不可枚举的属性可以被检测到 2. hasOwnProperty()方法 var o = {x:1}; o.hasO