foobar

首先，来看看这段 PHP 代码： view source print ? 1 function foobar() { 2 echo "Hello Golang\n" ; 3 } 4 $funcs = array ( 5 "foobar" => "foobar" , 6 "hello" => "foobar" , 7 ); 8 $funcs [ "foobar" ](); 9 $funcs [ "hello" ](); 它会输出： view source print ? 1 mikespook@mikespook-laptop:~/Desktop$ phpfoobar.php 2 HelloGolang 3 HelloGolang 用这个方法调用匹配名字的函数，非常有效。 那么，在 Golang 中是否可能用函数的名字来调用某个函数呢？ 作为一个静态、编译型语言，答案是否定的……又是肯定的！ 在 Golang 中，你不能这样做： view source print ? 01 func foobar(){ 02 //bla...bla...bla... 03 } 04 funcname := "foobar" 05 funcname() 06 不过可以： 07 08 func foobar(){ 09 //bla...bla...bla... 10 } 11 funcs :=map

Hive Tutorial 概念 Hive是什么 Hive是一个基于Hadoop的数据仓库基础架构。Hadoop在通用硬件上对数据存储和加工(使用map-reduce编程范式)提供巨大的扩张和容错能力。 Hive被设计用于简化海量数据的数据汇总，即席查询和分析。它提供了一个简单的查询语言叫做Hive QL，其基于SQL和使熟悉SQL的用户容易做即席查询，汇总和数据分析。同时，Hive QL也允许传统的map/reduce程序员插入他们自定义的mappers和reducers来做没有在语言中提供支持的更复杂的分析。 Hive不是什么 Hadoop是一个批量处理系统，Hadoop作业倾向于有高延迟和相当大的开销在作业提交和调度上。因此Hive查询的延迟通常很高(几分钟)即使数据集非常小(如几百兆)。所以其不能与实施在小数据集的多次迭代处理且迭代间的响应时间少于几分钟的Oracle系统相比较。Hive对准提供可接受(但不是最佳的)延迟于交互数据浏览，小数据查询或测试查询。 Hive并非设计用于在线事务处理和不提供实时查询和行级更新。其最好用于在大量不可变数据集(像web日志)上的批量作业。 在接下来的章节我们提供一个该系统功能的指南。我们开始于数据类型、表和分区（与你在传统关系型数据库找到的很相似）概念的描述和使用一些例子来举例说明QL语言的功能。 数据单元 按尺寸的顺序

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Having Trouble with Entity Framework. I have been populating EntityReferences with an EntityKey inorder to eliminate the need for querying the database ever time I add an Entity Reference. Now I want to do the same thing for an Association (EntityCollection) but im not sure where to start. below are the details of what I am trying to do Tables CREATE TABLE [dbo].[Foo]( [FooId] [int] IDENTITY(1,1) NOT NULL, [FooName] [nvarchar](50) NOT NULL, ) CREATE TABLE [dbo].[Bar]( [BarId] [int] IDENTITY(1,1) NOT NULL, [BarName] [nvarchar](50) NOT NULL,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I need to select a node with a id attribute that I only know part of the value. If I have several <tr> elements: <tr id = "foobar[1234]" ></td><tr id = "foobar[1235]" ></td><tr id = "foobar[1236]" ></td><tr id = "bar[1]" ></td><tr id = "foobar[1237]" ></td><tr id = "bar[12]" ></td> I only want to select the id's that start with foobar . I've tried: //tr[@id='foobar*'] but it doesn’t work. Any help? Thanks. 回答1: //tr[starts-with(@id,'foobar')] A list of XPath 1.0 functions: http://www.edankert.com/xpathfunctions.html If your

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Make a first project with gradle, so i look at spring, gradle, hibernate projects how they organize gradle files, and start make my own. But, can't find mistake, why my configuration doesn't work. (sub-projects cant resolve dependency) So project tree : Root project 'foobar' +--- Project ':foobar-app' | +--- Project ':foobar-app:people' | | +--- Project ':foobar-app:people:people-api' | | +--- Project ':foobar-app:people:people-core' | | +--- Project ':foobar-app:people:people-data' | | \--- Project ':foobar-app:people:people-rest' | \---

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a way to view a bash function's definition in bash? For example, say I defined the function foobar function foobar { echo "I'm foobar" } Is there any way to later get the code that foobar runs? $ # non-working pseudocode $ echo $foobar echo "I'm foobar" 回答1: Use type . If foobar is e.g. defined in your ~/.profile : $ type foobar foobar is a function foobar { echo "I'm foobar" } This does find out what foobar was, and if it was defined as a function it calls declare -f as explained by pmohandras. 回答2: You can display the definition

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have many rows in a database that contains xml and I'm trying to write a Python script that will go through those rows and count how many instances of a particular node attribute show up. For instance, my tree looks like: <foo> <bar> <type foobar="1"/> <type foobar="2"/> </bar> </foo> How can I access the attributes 1 and 2 in the XML using Python? 回答1: I suggest ElementTree . There are other compatible implementations of the same API, such as lxml , and cElementTree in the Python standard library itself; but, in this context, what they

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to pass some custom arguments to the console app when I install and start it as a Windows Service via TopShelf. When I use: MyService install start /fooBar: Test Console application fails: [Failure] Command Line An unknown command-line option was found: DEFINE: fooBar = Test Question: How can I make my arguments to be recognizable by TopShelf so that I can consume their values? 回答1: EDIT: This only works when running the .exe, not when running as a service. As an alternative you could add the option as a configuration value and read

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've been playing around with a very simple JPA example and am trying to tweak it to an existing database. But I can't get past this error. (Below.) It just has to be some simple thing I am not seeing. org.hibernate.hql.internal.ast.QuerySyntaxException: FooBar is not mapped [SELECT r FROM FooBar r] org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:180) org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110) org.hibernate.hql.internal.ast.tree

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: My question: Why is callNextMethod() not passing arguments as expected to the next method? Situation: Say I have two hierarchical classes foo and bar ( bar is subclass of foo ) for which I have a method foobar that can dispatch for both classes (i.e., has methods for both classes). Furthermore, the method for the (sub)class bar calls the method for foo after some calculations with callNextMethod() . Both methods have the same additional argument (with default) that should be passed to the method for foo , where only it is relevant.