nosql use cases

supports list and other collection data structures with highly compatible APIs with Redis. Therefore, when migrating data from Redis to SSDB, minor changes. A zset is used to store the pop-up window history of each user. The key is the timestamp, and the corresponding score is also the timestamp, because we only care about the pop-up window history of users, the specific pop-up window information is stored by map (the timestamp is used as the key, corresponding to the pop-up window information

Use Cases and implementation methods for Android apps that do not display icons on the desktop after installation, androidapp Recently, I am working on a IOV product for the company. because the company is good at the R D of Automotive decoder, therefore, in addition to the OBD Protocol widely used in IOV products on the market, the diagnostic function of this product also uses some dedicated vehicle proto

Oracle shrinktable shrink table Use Cases There is a serious shortage of External table space in the site, and the customer does not want to resize it. To clean up some data, it is a large field blob. the tablespace is 1 TB and 0.99 TB has been used. After the blob before December 31, is deleted, GB of data is found in the basic information table of the attachment. However, the tablespace is not released (h

: {type:string,default:""}, Gender: {type:string,default:""}, });//give the user class an interfacevarUser = Mongoose.model ('User', Userschema);//The user class of Promise and its methodsPromise.promisifyall (User); Promise.promisifyall (User.prototype); Module.exports= User;In addition, the following use of the same set of the table will need to do the above processingUse the following methods:Room.findone ({type:'Pano'}) //. EXEC (). Then (

background Use TestNG to write the test cases, through the @test to execute the use case, the general local through the IDE to execute the corresponding method, continuous integration, all through Maven to execute or specify Testng.xml execution, but if you want to execute the test case through interface/interface. Steps TestNG actually provides two ways to do t

Differences and Use Cases of four reference types in java (including theory, code, and execution results) We know that the java language provides four reference types: SoftReference, WeakReference, and PhantomReference, which are closely related to references, there is also a reference queue ReferenceQueue. The relationship between reference and reference queue is very important for garbage collection. To l

Use Cases of Oracleupdate +Drop table test purge;Create table test (Id number,Code varchar (20 ),Name varchar (20));Insert into test values (1, '20170101', 'aaa ');Insert into test values (2, '20170101', 'bbb ');Insert into test values (3, '20170101', 'ccc ');Insert into test values (4, '20170101', 'ddd ');Insert into test values (5, '20170101', 'eee ');Insert into test values (6, '20170101', 'fff ');Commit

; \ while ((c = GetChar ())! = EOF c! = ' \ n ') \{\; \}int Main (){int num = 0;Char ch = "' ;scanf ("%d", num);Clear_buf ();scanf ("%c", ch);printf ("Hello bit\n");System ("pause");return 0;}Results:8SHello bitPlease press any key to continue ...Analysis: Program 3 recommended to use, keep using GetChar () gets the characters in the buffer until the obtained C is "\ n" or the end of file is EOF, this method perfectly clears the input buffer and i

The following small series will introduce the application scenarios of scipy. misc. logsumexp functions in python. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at scipy. misc. the input parameters of the logsumexp function are (a, axis = None, B = None, keepdims = False, return_sign = False). For specific configuration, see here. the returned value is np. log (np. sum (np. exp ())). Here we need to emphasize the

touch: AnyObject in touches {var t:UITouch = touch as! UITouchprintln(t.locationInView(self.view))}}override func touchesEnded(touches: SetNSObject>, withEvent event: UIEvent){//两点触摸时，计算两点间的距离if touches.count == 2{//获取触摸点let first = (touches as NSSet).allObjects[0] as! UITouchlet second = (touches as NSSet).allObjects[1] as! UITouch//获取触摸点坐标let firstPoint = first.locationInView(self.view)let secondPoint = second.locationInView(self.view)//计算两点间的距离let deltaX = secondPoint.x - firstPoint.xlet del

DubboAdd a dubbo.properties configuration file dubbo_register_address=zookeeper://10.1.1.62:2181?backup= 10.1.1.63:2182,10.1.1.64:2183,10.1.1.65:2184,10.1.1.60:2185,10.1.1.61:2186dubbo_application_name= Nbl-frameworkdubbo_scan_package=cn.bidlink.nblProducer end, add @dubboservice on the implementation: Public interface Testdubboservice {public int getnum ();} @DubboServicepublic class Testdubboserviceimpl implements Testdubboservice {@Overridepublic int getnum () {return 1;}}Consumer end: publ