Tag：case
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Time：2021-5-10
Now there is almost no back end of wechat applet made by. Net on the Internet, only PHP and Java. Why? Can’t it be done? It is said on the Internet that we use the web API of asp.net MVC framework to do the back-end of wechat applet, but we hardly see any cases. Is […]
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Time：2021-4-30
1introduce When a web page is loaded, the browser will create a document object model of the page. The DOM standard stipulates that each member in an HTML document is a node. The HTML DOM tree is shown in the following figure 2Find node 1. Direct search Document. Getelementbyid # get a unique tag based […]
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Time：2021-4-21
This paper is compiled from:Kangaroo cloud technology | SQL optimization case ( two ) : or condition optimization Data stack is a cloud native station data center PAAS. We have an interesting open source project on GitHub:https://github.com/DTStack/flinkx Flinkx is a Flink based batch flow unified data synchronization tool, which can collect both static data, such […]
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Time：2021-4-21
The text and pictures of this article are from the Internet, only for learning and communication, and do not have any commercial use. If you have any questions, please contact us in time. The following article is from Python practical dictionary, written by kender preface In 2014, a policeman named Ferguson killed Michael in […]
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Time：2021-4-19
Traditional data synchronization solution and Flink SQL CDC solution Business systems often encounter the need to update data to multiple storage. For example: an order system just started, just need to write to the database to complete business use. One day, the Bi team expects to do full-text indexing on the database, so we need […]
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Time：2021-4-17
Case study: Select decode (columnname, value 1, translation value 1, value 2, translation value 2,… Value n, translation value n, default) From talbename Where … practical application decode(cxcygzcg, ”, 0, null, 0, cxcygzcg) cxcygzcg
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Time：2021-4-16
recursion Maze problem (backtracking) concept In a nutshell: recursion means that a method calls itself, passing in different variables each time,Recursion helps programmers solve complex problemsAt the same time, make the code concise Case recursive call mechanism Printing problems public static void test(int n){ if(n>2){ test(n-1); } System.out.println(“n=”+n); } Recursive call rule: When a program […]
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Time：2021-4-13
Introduction to MYCATMYCAT server is equivalent to a super distributed database, supporting 100 billion dataTidb: open source distributed database designed by pingcapLogic before business transformationCase source: China Mobile Internet of things group three fee audit systemLogic after business transformationCase source: China Mobile Internet of things group three fee audit system
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Time：2021-4-2
Apicloud 3.0 released full translation cross platform App Engine deep engine 3.0 and multi terminal development framework AVM. Developers can develop Android & IOS native app, applet, H5 and IOS light app simultaneously in one technology stack. Powerful native rendering engine provides better performance and experience for app & applet. We encourage developers to develop […]
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Time：2021-4-1
If the following error occurs in your stored procedure or other scripts, it is usually caused by the error of rollback transactionlogicThere is no matching begin transaction on or a transaction has not started (or it may have been committed), but you have done the transaction rollback operation, otherwise this error may occur. Msg […]
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Time：2021-3-24
Link to the original text:http://tecdat.cn/?p=20650 Receiver operating characteristic curve (ROC) is usually used for binary logistic regression. However, the result of interest in epidemiological studies is usually the time of the event. The time-dependent ROC can be used to describe the prediction model in this case more comprehensively. Time dependent ROC definition Let Mi be […]
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Time：2021-3-24
Source code:GitHub. Click here || Gitee. Click here 1、 Overview of MapReduce 1. Basic concepts MapReduce, one of the core components of Hadoop, is a programming model for parallel computing of large-scale data sets, in which map and reduce are used. MapReduce is not only a programming model, but also a computing component. The processing […]
