How to design a database to store chat records, the data roughly include:
Message Send time
Sent by
Accepted by
Message ID, unique
Message type: text, picture, etc.
Message content
How the data sheet should be designed, thank you.
Reply content:
How to design a database to store chat records, the data roughly include:Message Send timeSent byAccepted byMessage ID, uniqueMessage type: text, picture, etc.Message contentHow the data sheet should be
Yes, surface. It's a tablet designed for me. It's also for reading this article.ArticleDesigned by the person. You can say that it is N or more bad (I have complained a lot), but some functions can only satisfy you by the surface, which is unmatched by tablets on other platforms.
Who am I?
Like everyone else, an IT employee is a data analyst. The usual job is to deal with business data, play the most with the database, and write the front-end i
Description of new features for custom images designed by Yifei 90 and Yifei New Features
The custom image job of yi fei 90 is designed as follows (Figure 1 ):
Figure 1
You can set multiple solution numbers for the same program.
Each solution can be applied to: all users, the following groups, and the following users (which can be set by group)Only one solution number can be set for the same group. For
The background management framework is designed like the wordpress management background, and the wordpress background managementA background management framework designed like wordpress management backend
This Markdown editor uses [StackEdit] [6] to modify it. using it to write a blog will bring a new experience:
The padding-top of html is used to move the entire down, and position: fixed is used to posi
The Splash page for Android performance optimization should be designed in this way.Current SplashActivity Design
At present, applications on the market will start a SplashActivity at startup. As a welcome interface, why is this design?Personal summary has three advantages:1. Better User Experience
For example, you can dynamically change the welcome image in the background or explicitly welcome xxx back. Sina Weibo's interaction is like this.2. The Ap
Flash memory is divided into two types: nor flash memory and nand flash memory, especially for NAND FlashMemory features faster erase time, small size, and low cost, making NAND more suitableEmbedded system. Flash memory is a storage device. To use this storage deviceUse File System on memory. The file system used on a general block device (e.g. Disk), for example:NTFS, FAT32, and ext2 can be used on flash memory, but these file systems are not designed
In the past, writing a blog did not use the directory structure. It will be used now. For details about how to use the directory structure, refer to: the use of the directory structure requires a pet store. The number of pets in the pet store can be multiple (determined by the number of users, you need to search for the pet information based on the keywords of the pet. The required pet information is designed by yourself. The knowledge interface is us
the hosting provider of ADO, then the hosting provider calls the SQL Server OLE DB Provider. The SQL server hosting provider and the OLE DB Provider operate data directly.
The significant difference between ADO. NET and ADO. net connection objects is that ADO. net connections are not supported.CursorlocationAttribute. Note that this is not a document error, but a controversial design issue. To highlight the data-centric principle, ADO. NET has no explicit implementation of cursors.
In ADO,
How to upload the content designed by the editor to the serverBy implementing this function, you can save the HTML format (including tags) text to the binary field in the server database to dynamically store and load the content.Design steps:1. add content to the Editor (including fonts, images, etc .......)2. Click the HTML button.3. Press the read button to enter the markup string designed by the editor i
Swing is a GUI toolkit designed for Java.Swing is part of the Java Foundation Class.Swing includes graphical user interface (GUI) devices such as text boxes, buttons, splitter panes, and tables.Swing offers many better screen display elements than AWT. They are written in plain Java, so they can run across platforms as well as Java itself, unlike AWT.They are part of the JFC.They support replaceable panels and themes (specific themes that are the defa
Hotspot in the source code why the Java object is designed to oop-klass this structure. Just to avoid the creation of a virtual function table for each Java object.
Http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/87ee5ee27509/src/share/vm/oops/klass.hpp
VTBL is the main feature of polymorphism, if all instances of a class are common to one vtbl? The polymorphism of this implementation will not be problematic
An instance of an object does no
relationships.So need an intermediate table, I believe we are very familiar with, naturally will not have doubts.After the application scenario has users and roles, it is necessary to design the application scenarios, such as how many modules (System modules, project management modules, sales modules) an application has.A module like this is an application scenario, with menus, operations, and so on.Let's say we've designed it now, and the applicatio
Tags: Learning city Optimization Company Object etc questions why businessThis is the last topic of the index, index coverage, of course, the better way to learn is to look at the masters of the design of the index, to see what nutrients can be extracted from the things, let us see Look at one of the core orders tables in the database. One: View the schema of the table 1--View schema information for table
2 SELECT c.column_id,c.name,t.name from Sys.columns as C
3 joins Sys.types T
4 on C.SY
Before writing a similar article, want to write too many things, the result of nothing to speak clearly. So, re-write a set of introductory tutorials, "Understanding Interaction Design", "interactive design of the functional Scope", "Interactive design common methods" ... Several chapters share my understanding and experience of the industry.
Let's start with the topic (Why interaction Design, what interaction Design can do):
1. What are the elements of a successful
In today's mobile App interface design, you can see visual effects of different creative types. Especially on Dribbble, there are a lot of app UI conceptual designs to surprise you. If you want to get inspiration, it is necessary to look at the following 12 mobile phone interface designs that will surprise you with user experience.Articles you may be interested in
Creative Design: Application of folding effect in mobile apps
45 sets of fresh and exquisite PSD webpage design materials
Share 1
8 well-designed HTML5/CSS3 applications and 8 beautiful html5css3
1. CSS3 beautiful custom Checkbox check box 9 charming styles
Today, we will share a beautiful custom Checkbox check box in CSS3 with nine fascinating styles. These checkbox styles are rich and easy to use.
Online Demo
Source code download
2. HTML5/CSS3 luminous search form awesome CSS3 form
Today, we will share another light-emitting form, a CSS3 light-emitting search form with a blac
Porting of C ++ custom controls (porting custom controls designed in other programs to the current system) and Custom Controls
The method is simple: copy the required code to the new system, and add the relevant files to the existing system, and pay special attention to the following question 1 \ If menus or other resources are used in the original design, the corresponding resources should be manually added in the new menu. no other good methods fou
Most web designers are not familiar with print control, and they tend to be more obsessed with pixels than printers. In the real world, many people rely on Web pages for reference: In this digital age, in a number of special occasions, many people hold the paper in their hands. Web developers can take steps to compensate for the gap between the printer and the LCD screen.
Style for printer instead of screen design
/* Style will be applied only to print */@media print {}
Note * You can also use
in the scan and keep the following points:1. Encounter [or {a new object and store the object in collections2. Encounter ' \ \ ' needs to be escaped, you have to jump directly over, and stored in the scanned temporary variables. Like \\{, you don't need a new object.3. Hit the "symbol, you have to mark, before the next" appears, the scanned out as a string into the temporary variable.4. Touch: Symbol, start tag is the beginning of a map, and the subsequent occurrences of the string are stored i
() + "Years"+stinfo.wmonth.tostring () +"Month"+stinfo.wday.tostring () +"Day”Time.Text = (stinfo.whour+8). ToString () + "Point"+stinfo.wminute.tostring () +"Score of"+stinfo.wsecond.tostring ()+Seconds”} Three.Conclusion. The above describesVisual C #The whole process of developing multi-functional shutdown program has some practical value. Through the study of this article, I believe that slightlyApiDevelopers using the basics can immediately comprehend by analogy and quickly masterVisualC#I
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