statement. It is the sorting of the operation results of the entire set. The column name, alias, or specified by position cannot be used for columns not displayed in the first select statement.
⑥ The first select statement receives the column name, alias, or location mark. The column name of the query result is consistent with that of the first select statement.
7. It can be used for subqueries.
2 Use Cases
Controller returns JSON data@ResponseBody // View user information? JSON @RequestMapping (value="/{username}", method=requestmethod.get) // Direct return IO stream data in response, no need to load view public map view (@ Pathvariable String username) {// return Userlist.get (username); return userlist; }JSP page Gets the value:The use of $.each () is difficult"Div"style="width:200px;height:200px;border:1px Solid Red">
DescriptionGlut_single 0x0000 refers to the order cache windowGlut_double 0x0002 specifying a double-cache windowPrincipleGlut_single single buffer, screen display call Glflush (), the image is rendered directly in the current display cache, there will be a graphics bounce (flicker) problemGlut_double double buffering, screen display call Glutswapbuffers (), the image is drawn in the other cache, after rendering, the entire cache is pasted into the current window, can eliminate flicker, general
2012-02-12 wcdjProblem description:
A dice has 6 sides with even probability. I have 7 things to choose randomly and evenly. How can I continue to throw at least?Problem Extension: If I have four things, five things, eight things, nine things, ten things ...... How can I use n cases?Minimum throwing timesTo achieveUniform Distribution?
From:The problem comes from
Ideas:
Note the keywords in the problem:
one task can be executed. after the task is completed, execute the next task. * Can I modify the default setting? Of course. * You can call asynctask.exe cuteonexecutor (Executor, Params); * The first parameter executor is set to a self-configured Metro pool. ** 2 Differences Between asynctask and thread use scenarios * asynctask is simple, flexible, and, you do not need to consider UI updates. but pay attention to the problems caused by the differen
Node. js emitter. emit method instructions, node. js Use Cases
Method description:
When an event is triggered, several optional parameters are passed to the parameter table of the event listener.
Syntax:
Copy codeThe Code is as follows:Emitter. emit (event, [arg1], [arg2], [...])
Receiving parameters:
Event Type
Arg1 ~ Parameters passed by argN (multiple)
Example:
Copy codeThe Code is as follows:Var events
[C ++ 11] _ [primary] _ [Use Cases of unique_ptr]Scenario
Std: unique_ptr is a new smart pointer provided by C ++ 11. It has the following features:A non-thread-safe alternative to auto_ptr, because it does not provide copy Constructor and Copy Assignable, that is, pointers cannot be copied. only one smart pointer has ownership of the contained instance object, meaning that only one smart pointer calls the
1. Introducing the JAR file2. Add Spring MVC Interceptor Configuration to the Springmvc-config.xml filePrinciple: The target filters all spring MVC requests, judging that the request parameters contain the callback parameter, and the response is returned in JSONP format.Note: If there is a better way, please let us know and appreciate it."Spring MVC" framework-core cross-domain use cases
declared in this scope only needs to be added to the/include/fcgio.h file #includeThe installation is finished.3, write and test fcgi program1) Demo test program fcgi_test2.c as follows: #include "fcgi_stdio.h" #include int Main (void ) {int count = 0 ; while (Fcgi_accept () >= 0 ) {printf ( "content-type:text/html\r\n" "\ r \ n" Span class= "hljs-string" > " " Request number%d running on host , ++count, getenv ());} return 0 ;} 2) compiling[Email protected] cgi-bin]# gcc-g fcgi_tes
SVN directory use case:A team plans to develop a "Mo Mo" projectPart of the base code is already in the early stages of this projectResearch and development team in this basic code after 3 months of effort, developed a relatively complete V1.0 version of the launch promotion, and achieved good results (backup to tags)As the market feedback was good, the team began to work on the development of the V2.0 versionIn the development of the V2.0 version, it
Take the MAVEN project as an example:Steps:1. Add dependency to the Maven Pom.xml file:You will then add 3 jar packages:2. Add log4j.properties under the project 3.log4j.properties File Contents4. Configure in Web. xml: "classpath:" Representative:/web-inf/classes/5. Add in the code:6. The following can be used:Classpath is the path that represents/web-inf/classes/.Classpath and classpath* differences:Classpath: Only look for files in your class path;Classpath*: Includes not only the class path,
Label.transform = Cgaffinetransformmakerotation (*m_pi/180.0);Rotate clockwise 90 degreesLabel.transform = Cgaffinetransformmakerotation (*m_pi/180.0);Rotate clockwise 180 degreesLabel.transform = Cgaffinetransformmakerotation (*m_pi/180.0);Rotate clockwise 270 degreesCgaffinetransform transform = label.transform;Transform = Cgaffinetransformscale (transform, 2,0.5);//The front 2 means twice times the horizontal magnification, and the back 0.5 means half-scaled.Label.transform = transform;View p
Today we have access to the data sharing class and now summarize how it's used1. Directly bind a menu item, the code is as followsIn fact, the icon in this can not be set, because you set up and no effect. It's actually set in the theme. item android:id = "@+id/action_share" Andro Id:icon = "@drawable/ic_menu_share_holo_light" Android:title = "@string/share" android:enabled = "true" Android:actionproviderclass = "Android.widget.ShareActionProvider" android:visible = "false"
Converts a list of strings to NumberList public static extends number> list Stringtonumlist (String str) {List new arraylist (); if (Stringutils.isnotempty (str)) {str ing[] Idarr = Str.split (",", 0); for (String Id:idarr) { Span style= "color: #0000ff;" >if (Stringutils.isnotempty (id)) {//list.add ((T) integer.valueof (ID )); }}} return list; }Generic Use Cases
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