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key-value

Are there any stable and production quality nosql datastores?

Are there are production quality nosql stores that I can use on a production system. I have looked at cassandra, tokyodb, couchdb etc but none of them seem to be ready for deployments on production like environments. I am talking thousands of requests per minute and lots of reads/writes/updates. My only concern is speed and service times. Does anybody know of production systems that use nosql stores effectively ? Does anybody know of a nosql store that is backed by a big enterprise like Google/Yahoo/ IBM ?

2021-11-29 02:31:47    分类:问答    scalability   nosql   production-environment   datastore   key-value

Is there a library or framework for setting preferences from within an iPhone application?

Using the Settings.app on the iPhone isn't that hard. In fact Xcode does the most of the work for you. Just add the Settings.bundle to your project and there you have it for nearly no cost. At the moment I'm developing an application for the iPhone which requires the user to fill out several "forms", mostly key-value pairs, some sliders and several modal views with "dropdown" menus. So similar the task is similar to what the Settings.app does. Doing the forms by myself is a heavy task in my opinion, so I'm wonding if there's a framework for this kind of tasks. Unfortunately it looks like Apple

2021-11-29 00:27:06    分类:问答    ios   iphone   forms   settings   key-value

What is the best VBA data type`key`=>`value` to save data same as PHP array

I'm working with VBA and need to save data in type key=>value to getting fastest; This data type help me cache responese text from http request, increase query speed. But I don't know what is the best way to do it? I need a data type same as php array with key=>value! Thank for help!

2021-11-28 15:46:08    分类:问答    arrays   list   vba   key-value

get Key by value, dict, python

How can I get a key from a value? my dict: countries = { "Normal UK project" : "1", "UK Omnibus project" : "1-Omni", "Nordic project" : ["11","12","13","14"], "German project" : "21", "French project" : "31" } my semi functioning code: for k, v in countries.items(): if "1" in v: print k expected output: Normal UK project actual output: French project UK Omnibus project German project Normal UK project How can I fix my code?

2021-11-28 08:17:00    分类:问答    python   dictionary   key-value

KeyEventArgs.KeyData, KeyEventArgs.KeyCode and KeyEventArgs.KeyValue

I have question about the KeyEventArgs's KeyCode and KeyData and KeyValue. KeyCode and Keydata are Keys type, but I don't know what the difference between them is. For KeyValue, I don't know what it is -- it has an int type, does it return the char value of the pressed key? I don't have much experience with Key events; any explanation of how they function and how to use them would be greatly appreciated.

2021-11-28 07:17:28    分类:问答    c#   .net   keycode   key-value   keyeventargs

Cassandra 时间序列数据(Cassandra time series data)

问题 我们正在考虑使用 Cassandra 来存储来自各种来源的信息流。 我们面临的一个问题是在两个日期之间进行查询的最佳方式。 例如,我们需要检索日期时间 dt1 和日期时间 dt2 之间的对象。 我们目前正在考虑将创建的unix时间戳作为指向实际对象的键然后使用get_key_range查询检索? 显然,如果两个项目具有相同的时间戳,这将不起作用。 一般来说,这是在 noSQL 存储中执行日期时间的最佳方法吗? 回答1 Cassandra 的行可能非常大,因此考虑将其建模为行中的列而不是 CF 中的行; 那么你可以使用列切片操作,它比行切片更快。 如果没有与此相关的“自然”键,那么您可以使用每日或每小时键,例如“2010/02/08 13:00”。 否则,是的,使用范围查询(get_key_range 在 0.5 中已弃用;使用 get_range_slice)是您的最佳选择。

2021-11-28 02:24:38    分类:技术分享    nosql   cassandra   key-value

如何为 JavaScript 对象分配多个值?(How to assign multiple values to a JavaScript object?)

问题 假设我有一个带有键/值对的对象,如下所示: var someVar = { color: "white", font_size: "30px", font_weight: "normal" ...some more variables and functions }; 有没有办法对这些键进行多重分配,而不必执行以下操作: someVar.color = "blue"; someVar.font_size = "30px"; ... 回答1 在 ES2015 中,您可以使用 Object.assign: const someVar = { color: "white", font_size: "30px", font_weight: "normal" }; const newVar = Object.assign({}, someVar, { color: "blue", font_size: "30px"}); console.log(newVar); => { color: "blue", font_size: "30px", font_weight: "normal" } 回答2 使用 ES6 扩展运算符: someVar = {...someVar, color: "blue", font_size: "30px"} 回答3 您可以遍历另一个对象: var

2021-11-28 02:23:06    分类:技术分享    javascript   object   key-value

Java 属性中的键可以包含空白字符吗?(Can the key in a Java property include a blank character?)

问题 我们正在从数据库中获取属性(我们无法影响)并希望通过键/值映射访问它们。 我们面临的问题是其中一个属性键包含一个空白字符。 foo bar = barefoot 这是 - 正确 - 解释如下 key: foo value: bar = barefoot 有没有办法在键中包含空格,使其不被解释为分隔符? 我想这种行为就像预期的那样,但我想我可以在这里尝试一下。 回答1 您可以使用 Java Unicode 转义属性文件中的所有内容: \u003d为= \u0020表示空格 例如: foo bar = barefoot 必须是: foo\u0020bar\u0020=\u0020barefoot 所以将是: key: "foo bar " value: " barefoot" 回答2 也许你可以避开空格: foo\ bar = barefoot 编辑:糟糕,我没有看到您不能更改属性。 回答3 看起来分隔符应该是= ,而不是空格。 因此 - keyValuePair.split("=")应该做。 如果您从 java .properties文件加载它,那么您可以扩展java.util.Properties并覆盖此方法 public synchronized void load(InputStream inStream) throws IOException 以便它正确解析属性。

2021-11-27 23:44:23    分类:技术分享    java   properties   key-value

PHP create key => value pairs within a foreach

I want to create a key-value pairs in an array within a foreach. Here is what I have so far: function createOfferUrlArray($Offer) { $offerArray = array(); foreach ($Offer as $key => $value) { $keyval = array($key => $value[4] ); array_push($offerArray,$keyval); } return $offerArray; } If I declare the array within the foreach, it will overwrites it on each iteration, but defining it outside the foreach doesn't work either and causes triplets: array[0] => key => value array[1] => key => value How do I make it so I only get key-value pairs like this? key => value key => value

2021-11-27 23:05:17    分类:问答    php   arrays   foreach   key-value

Assign multiple keys to same value in array

$lang = array( 'thank you'=>'You are welcome', 'thanks'=>'You are welcome', 'thank ya'=>'You are welcome' ); As you can see this is going to get tiresome writing multiple keys for the same value is there any way I can do. $lang['thanks']=>$lang['thank ya']=>$lang['thank you'] Just trying to save myself some time here from rewriting a hundred times PHP class function: function fetch_key($key, $l,$bool){ $dynamic = new l18n; if($bool == true or is_null($bool)){ return addslashes( $dynamic->convert($key,$l) ); }else{ return $dynamic->convert($key,$l); } } EX $lang = array( 'thank you'=>'You are

2021-11-27 19:44:12    分类:问答    php   arrays   key   key-value