dimensioning guidelines

) clinet.mongoIt will be easy to locate the unique features of those MONGO. This makes your database more exchangeable (interchangeable). So if we change the main database to LEVELDB, then our MONGO-related queries will become: var client = client (LEVELDB (details));Client.put (key, value);Client.mongo.query (query); Developed togetherThe ideal database has not been built yet. Now, it's a series of high-level ideas that should be applied to this client. I am calling on the

Custom Controls of ASP. NET servers are a way to extend the functions of ASP. NET Web server controls. Some IDES (such as Microsoft Visual Studio 2005) simplify the use and development of custom controls. However, no matter which IDE you use, you must pay attention to ASP.. NET Server custom controls. The following lists the common security standards of ASP. NET Server custom controls, which are applicable to almost all ides. User-Defined controls for ASP. NET servers You can use ASP. for exampl

Page view ControllerPage view controllers use one of two styles to manage transitions between multi-page content-scrolling or flipping. This is what the page looks like in the iOS simulator:API NOTEView Page view controllers to learn more about defining Page view controller content in your code.A Page view controller: No default appearance for scrolling style Page view controllers can add a spine appearance between pages for page-flipping styles. Animate transitions betwee

Picture viewThe picture view displays a picture or a series of animated pictures.API NOTESee Uiimageview Learn more about defining picture views in your code.A picture view: No pre-defined appearance and user interaction is not allowed by default Check the properties of the picture and its top view to determine whether the picture should be stretched, matched, or nailed to a specific location In iOS 7 and later systems, a picture view with a template picture provides the current base

, but not all. In general, it is best not to put the text in some segments in a segmented control and put the picture in another segment.If necessary, adjust the content location in the custom segmented control. If you customize the background of a segmented control, make sure that the automatic centering of the content of the control still looks good. Use the Bar Metrics API to adjust the content location in the segmented control (see the Uisegmentedcontrol in the custom API to learn more about

interface is a part of another interface.do not use a page controller to display views in the hierarchy or in other complex structures. The page controller does not show how a view is associated with other views, and it does not show which view belongs to which point, so it does not help the user navigate to a particular view.do not show too many points. More than 10 points make it difficult to see the number of people at a glance, and more than 20 open views make sequential viewing a lot more

buttonsiOS offers a lot of standard toolbars and navigation bar buttons that are used in built-in apps. View Bar Button icons Learn how to design a custom icon. Elements in toolbars and navigation bars can be shaded using the Tintcolor property.Find the button description for the symbol name in table 41-1, and view the Uibarbuttonsystemitem document in Uibarbuttonitem Class reference.IMPORTANTFor all standard buttons and icons, it is necessary to use a button based on its meaning rather than th

triggers. In iOS 9, HomeKit supports triggers, which are a way to perform actions based on relationship conditions such as time, location, and the behavior of other homes. For example, a user might set a trigger to turn on the kitchen lights when the garage door opens and the sun goes down. Setting a relationship condition that contains multiple entries can become confusing, so it is important to make it as simple as possible to set up the UI. For example, displaying entries, attributes, and lo

What is the most basic thing about a website? What is the most basic thing about a website?-- Content? SEO (Search Engine Optimization )? UE (User Experience )? None! Yes speed!Websites with rich content are meaningless if they are too slow to be accessible. Seo is a good website, and it is useless if the search spider cannot catch it. ue is designed to be a user-friendly website, it is also empty talk if the user cannot even see it.Therefore, the efficiency of web pages is definitely the most

The rest architecture is a brand new development style for Web applications. It is the most successful distributed system architecture of Internet hypermedia in the world today. It makes people really understand the original appearance of the HTTP protocol. As the rest architecture becomes the mainstream technology, a brand new way of thinking for Internet network application development has become popular. Currently, 51, in-school, domestic, and Alibaba software all use the rest architecture to

on it clears the contents of the text field, regardless of the image you have displayed on it.If you can help the user understand the purpose of the text field, display a schematic. A text field can display placeholder text-such as a name (or address)-when there is no text in the text field.define the type of keyboard that matches the type of content you want the user to enter. For example, you might want to make it easier for users to enter URLs, pins, or phone numbers. iOS offers a number of

SAS and SATA Hard Drive guidelines When you add a hard disk drive to the server, follow these general rules: The system will automatically set all drive numbers If you are using only one hard drive, install the drive in the home with the smallest drive letter. When multiple drives are divided into the same drive array, these drives must have the same capacity to maximize storage space efficiency. Drives in the same logical volume must have the sa

Database design Guidelines (first, second, third paradigm description) I, relational database design Paradigm Introduction 1.1 First normal form (1NF) No duplicate columnsThe so-called First paradigm (1NF) refers to the fact that each column of a database table is an indivisible basic data item and cannot have multiple values in the same column, that is, an attribute in an entity cannot have multiple values or cannot have duplicate properties. If dupl

JavaScript guidelines This section describes other important things that need to be understood when JavaScript is used for encoding. JavaScript is case sensitive. A function named "myfunction" and a function named "myFunction" are two different functions. Similarly, variables "myVar" and variables "myvar" are different. JavaScript is case sensitive-so when you create or use variables, objects, and functions, pay attention to the Case sensitivity

It is increasingly used to access networks through mobile devices. Therefore, enterprises now need a mobile website more than ever before. But how can we create a good mobile website? To answer this question, Google partnered with AnswerLab to explore how a series of users interact with different types of mobile websites. Google has established 25 principles for designing mobile websites to help enterprises build mobile websites with excellent user experience.Articles you may be interested in

MySQL study Notes-guidelines for selecting indexes based on 17th optimization I. The index column to be searched is not necessarily the column to be selected In other words, the column most suitable for indexing is the column that appears in the WHERE clause or the column specified in the join clause, rather than the column in the selection list after the SELECT keyword, for example: SELECTCol_a distinct is not suitable for indexing columnsFROMTbl1 l

This article mainly introduces some suggestions and guidelines on the design of JavaScriptAPI. it lists many well-known jsapis for auxiliary instructions and strongly recommends them! It is a common concept for a friend who needs to refer to the design. generally, it can be understood as a plan or framework for a specific part to be prepared. In the Oxford English Dictionary, design is a main thread that binds art, system, hardware, or more. Software

SQL optimization tips and guidelines To optimize queries and avoid full table scanning, you should first consider creating an index on the columns involved in where and order. Try to avoid null value determination on the field in the where clause. Otherwise, the engine will discard the index and perform full table scan. select id from t where num is null It is best NOT to leave NULL for the database and try to use not null to fill the database. Remark

Atitit. after upgrading the class library framework API Code Compatibility Design Guide1. increase The API directly, the version number is added 1 above the comment 2. Discard APIs, use your ideas @dep13. Modify the API,14. Modify dependent import, ya Yao Add file mode. Maintain compatibility. 15. preferred to select the same file in the changes, because the file more than a bad management, the compilation speed is also slow ... 15.1. Advantages and disadvantages of adding file patterns

rendering (poor user experience), blocking onload event, using XHR Eval, XHR injection does not trigger the browser's busy indicator, whether the busy indicator is triggered by the technology and browser together. The purpose of the browser busy indicator is to let the user know that the page is running.If the download script is parallel, the browser execution script is the first to arrive at the first execution. is not performed in the order of arrangement, except document.write script Tag, sc