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什么是Kotlin Kotlin翻译成中文叫"靠他灵",它是由JetBrains公司发明的一种基于JVM的编程语言,目前Google宣布kotlin为Android开发的官方语言. Kotlin的优势 全面支持Lambda表达式 数据类 (Data classes) 函数字面量和内联函数(Function literals & inline functions) 函数扩展 (Extension functions) 空安全(Null safety) 智能转换(Smart cas…
php basic syntax PHP(Hypertext Preprocessor,超文本预处理器). 一.PHP入门 1.指令分隔符“分号”         语义分为两种:一种是在程序中使用结构定义语句,例如流程控制.函数定义.类的定义等,用来定义程序结构使用的语句.在结构语句后面不能使用分号作为结束:         另一种是在程序中使用功能执行语句,例如变量的声明.内容的输出.函数的调用等,是用来在程序中执行某些特定功能的语句,这种语句也可以成为指令,php需要在每个指令后用分号结束.…
Class basic syntax Wikipedia In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods). 在面向…
mongoDB basic from:http://www.tutorialspoint.com/mongodb prject:https://github.com/chenxing12/l4mongodb overview getting-start collection dataType insert find Overview MongoDB is a cross-platform, document oriented database that provides, high perfor…
1, http://www.asp.net/web-pages/overview/getting-started/introducing-razor-syntax-c 2, Introduction to ASP.NET Web Programming Using the Razor Syntax (C#)   By          Tom FitzMackenTom FitzMacken|February 7, 2014 1751 of 1904 people found this help…
Arrow Function.md Arrow Functions The basic syntax of an arrow function is as follows var fn = data => data; The code means : var fn = function( data ) { return data; } let getNumber = () => 42; console.log(typeof getNumber); console.log(getNumber()…
SQL Fundamentals || Oracle SQL语言 Capabilities of the SELECT Statement(SELECT语句的功能) Data retrieval from data base is done through appropriate and efficient use of SQL. Three concepts from relational theory encompass the capability of the SELECT statem…
mongoDB basic from:http://www.tutorialspoint.com/mongodb prject:https://github.com/chenxing12/l4mongodb overview getting-start collection dataType insert find Overview MongoDB is a cross-platform, document oriented database that provides, high perfor…
ref: Markdown基本语法 ref: Markdown Guide ref: Markdown Cheatsheet ref: Markdown Tutorial Lists Basic Syntax The Markdown elements outlined in John Gruber's design document. Overview Nearly all Markdown applications support the basic syntax outlined in J…
往往看别人的代码会有这样的感慨: 看不懂 理还乱 是离愁 别是一番滋味在心头 为什么要使用存储过程? 在mysql开发中使用存储过程的理由: 当希望在不同的应用程序或平台上执行相同的函数,或者封装特定功能时,存储过程是非常有用的 mysql 执行语句是要先编译,然后再执行的.这样如果查询并发大的时候.会浪费很多资源和时间.造成mysql进程占用资源过多,症状就是慢.但存储过程可以把一些特别的语句封装成一个方法 ,再编译好成一个可以执行的方法,对外只要接收参数就可以了.这样就不用再编译.执行就快了…
Introduction Log files are files that contain messages about the system, including the kernel, services, and applications running on it. There are different log files for different information. For example, there is a default system log file, a log f…
Annotations They provide information that you need to fully describe your program, but that cannot be expressed in Java. In general the kind of annotations you add and what you do with them are entirely up to you. Java SE5 contains three generalpurpo…
第五章 对数据库映射使用默认规则与配置 到目前为止我们已经领略了Code First的默认规则与配置对属性.类间关系的影响.在这两个领域内,Code First不仅影响模型也影响数据库.在这一章,你将让默认规则与配置的目光聚焦在类映射到数据库上而不影响概念模型. 我们从简单的映射开始,设法指定数据库的表名,构架与属性.在此你将掌握如何让多个类映射到一个通用表中,或将单个类映射到多个表中.最后,带您漫步各种继承架构的配置. 将类名映射到数据库表名和构架名 EF框架使用模型的类名的复数形式来生成数据…
可不能小看这个简单的 finally,看似简单的问题背后,却隐藏了无数的玄机.接下来我就带您一步一步的揭开这个 finally 的神秘面纱. 问题分析 首先来问大家一个问题:finally 语句块一定会执行吗? 很多人都认为 finally 语句块是肯定要执行的,其中也包括一些很有经验的 Java 程序员.可惜并不像大多人所认为的那样,对于这个问题,答案当然是否定的,我们先来看下面这个例子. 清单 1. public class Test { public static void main(St…
smb服务器只需要yum install samba 安装起,并修改配置文件就可以匿名使用了.   smb配置文件,这里允许匿名登录.红色部分代表我共享出来文件夹参数code [root@localhost samba]# cat smb.conf # This is the main Samba configuration file. For detailed information about the # options listed here, refer to the smb.conf(…
概述 Tomcat 的三个最重要的启动脚本: startup.bat catalina.bat setclasspath.bat 上一篇咱们分析了 startup.bat 脚本 这一篇咱们来分析 catalina.bat 脚本. 至于 setclasspath.bat 这个脚本, 相信看完这一篇, 就可以自己看懂这个脚本了. 可以点击 [Tomcat 源码分析系列] (附件) : setclasspath.bat 脚本 查看附注释的 setclasspath.bat 脚本 catalina.ba…
startup.bat在最后调用catalina.bat,并且传递了start参数,设置了CATALINA_HOME和CURRENT_DIR俩个临时环境变量.那么catalina.bat都做了什么? @echo off rem Licensed to the Apache Software Foundation (ASF) under one or more rem contributor license agreements. See the NOTICE file distributed w…
0x01  JDK和Tomcat安装 到oracle官网下载jdk,当前下载的版本是Linux x64 jdk-8u101-linux-x64.tar.gz 到apache官网下载tomcat,当前最新版本 Tomcat 8.5.4 Released jdk和apache的安装都十分简单(这里不是采用源码编译,就像在windows上使用绿色软件那么方便),将下载的文件解压即可使用,然后引入几个环境变量就算是完成了.tomcat是使用java开发的,所以依赖于jdk.使用下面两个命令可以检测安装后…
自己用的测试 C:\Users\Star>adb shell monkey -p com.cmstop.android --monitor-native-crashes -- pct-touch 30 -s 1 -v -v -v --throttle 200 100000   (不容易停下来) C:\Users\Star>adb shell monkey -p com.cmstop.android -v 500 --ignore-crashes   开始—>运行—>cmd    …
前几天发现tomcat提示 Could not initialize class sun.awt.X11GraphicsEnvironment  问题.以为不验证,就没太关注,今天发现,有同事提示了个bug,验证码刷不出来,查看日志,报了很多这个个错误.才意识到问题的严重. 网上找了找资料:共两种解决方案 1:http://love-love-l.blog.163.com/blog/static/21078304200908595214/ 2:http://tcrct.iteye.com/blo…
摘自 apache-tomcat-8.0.39-src 源码包中的 catalina.bat 脚本内容 @echo off rem Licensed to the Apache Software Foundation (ASF) under one or more rem contributor license agreements. See the NOTICE file distributed with rem this work for additional information reg…
Introduction One of the greatest logging tools out there for .NET is log4net. This software is the gold standard for how logging should be done. It is simple, powerful, and extensible. The best part is that it is part of the FOSS community. What coul…
For the first time in its history, Ext JS went through a huge refactoring from the ground up with the new class system. The new architecture stands behind almost every single class written in Ext JS 4.x, hence it's important to understand it well bef…
SQL is not very flexible and it cannot be made to react differently to differing sutuations easily. In  SQL queries we normally tell database what we want but not tell it how to do it. SQL : give commands, commands complete with ; PL/SQL : follow the…
#!/bin/sh # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file t…
If you ever need to create a view that selects all fields from a particular record, then you should be using the %SelectAll meta-sql construct. Why? Because %SelectAll uses the underlying record definition to select the fields - so it will always ret…
AddToDate is a PeopleCode built-in function for manipulating a date in PeopleCode. You can use it to adjust dates forwards and backwards, by a given number of years, months or days. The basic syntax is: Local date &dtExample;&dtExample = %Date;/*…
There are three major articles KB articles on Automating LR: 1. Command line arguments for the LoadRunner Controller – Previously Mercury KB 133522. How to execute Analysis with a .lrr or .lra file from DOS - Previously Mercury KB 92413. How to creat…
下文写的关于Java中的finally语句块什么时候执行的问题.什么时候执行呢?和return.continue.break.exit都有关系,尤其return语句非常有意思,于是分享给大家.谢谢Smox! 问题分析  首先来问大家一个问题:finally 语句块一定会执行吗? 很多人都认为 finally 语句块是肯定要执行的,其中也包括一些很有经验的 Java 程序员.可惜并不像大多人所认为的那样,对于这个问题,答案当然是否定的,我们先来看下面这个例子.清单 1. public class …
http://www.pascaland.org/pascall.htm Some titles (french) : Compilateurs Pascal avec sources = compiler with sourcesComposants pour Delphi = Components for DelphiCompilateurs pour autres langages avec sources en pascal = Compilers for other languages…