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Whether npm or other front-ent package manager tools are all writtent by node, therefor, if we want to use it, we should install node at first. After 阅读全文
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正则表达式中的特殊字符 字符含义 \ 匹配将依照下列规则: 在非特殊字符之前的反斜杠表示下一个字符是特殊的,不能从字面上解释。例如,没有前面'\'的'b'通常匹配小写'b',无论它们出现在哪里。如果加了'\',这个字符变成了一个特殊意义的字符,意思是匹配一个字符边界。 反斜杠也可以将其后的特殊字符, 阅读全文
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1. Check version number 2. Update npm 3. Installation Windows System 使用淘宝镜像命令: 4. Install modules by npm 5. 查看npm 安装的所有模块 6. Uninstall module 7. Updat 阅读全文
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When there are some property contents we want to keep, usually, we can use Property table to keep them. 2.Insert data to property table 3.Get the valu 阅读全文
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1.How to establish a databse connection using JDBC 1).Register JDBC Driver -DriverManager.registerDriver() 2).Create Connection Object -DriverManager. 阅读全文
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Problem Description When we want to create a table or insert one column data to a table,if the field of this table or the value of one field has speci 阅读全文
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ThinkingHashMap 和HashSet其实类似于具有特定存储方式的二维数组。拿Integerhashset为例,我想要往hashset里面存储一个数字5,首先先通过某一种hash算法获得一个hash值比如获得的是3,那么先纵向遍历,查看二维数组的纵列第三个位置上是否为空,如果为空,就将该二... 阅读全文
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Problem & GoalUsually, like in java, any object will implement its to_string() function. So in Plsql, there is the same requirement.We want to impleme... 阅读全文