Programmer Group

On the Isolation Level of SQLThe SQL standard defines four isolation levels, as follows:1. Read UncommittedAt this isolation level, all transactions can see the execution results of other uncommitted transactions. This isolation level is seldom used in practical applications, because its performance is not much better than other levels. Reading ...

In the development process, page js often encounters the need for current login user information (menu privileges, user basic information, configuration information). Generally, we may not care too much about these information acquisition methods, but now the front end is packaged by webpack. Even if the code is partitioned, js files and css fi ...

Explain VSCode is an editor. By default, it does not have a compiler and debugging environment. It needs to install the compiler by itself. Debugging can be done with its plug-in. The compiler suite is based on TDM-GCC, which is easy to use. (Codeblocks, Dev-Cpp and other default bands are this one). Paths are automatically added to the environ ...

1. Create EntityManager with annotations: /*unitName is used to select a specific PersistenceContext and the primary data source is selected by default, which passes through the.persistenceUnit("secondaryPersistenceUnit") when creating the bean s of the data source To create it by */on the object of EntityManagerFactoryBuilder @Pe ...

Vulnerability number: CVE-2017-8464 Vulnerability Level: Serious Vulnerability profile: If a user opens a malicious LNK file carefully constructed by an attacker, it will cause remote code execution. An attacker who successfully exploits this vulnerability can gain the same user privileges as a local user. Attackers can spread malicious LNK fil ...

Date examples: SELECT TO_DATE('2006-05-01 19:25:34', 'YYYY-MM-DD HH24:MI:SS') FROM DUAL SELECT TO_DATE('2006-05-01 19:25', 'YYYY-MM-DD HH24:MI') FROM DUAL SELECT TO_DATE('2006-05-01 19', 'YYYY-MM-DD HH24') FROM DUAL SELECT TO_DATE('2006-05-01', 'YYYY-MM-DD') FROM DUAL SELECT TO_DATE('2006-05', 'YYYY-MM') FROM DUAL SELECT TO_DATE('2006', 'YYY ...

Introduction: ARKit is undoubtedly a bright spot at the WWDC 2017 conference held this morning. Apple added ARKit to its own development components, which reduced the difficulty of augmented reality development, but improved the effect a lot, and combined with its own hardware, it eventually produced a very good visual effect. This also s ...

2.7 Disclosure - Service side processing request process Target: From the source point of view, analyze a series of operations after the server receives the request, and eventually return the value that the client needs. Preface The previous article talked about the process of sending requests by the consumer side, which is about the process of ...

Original articles, reprinted please indicate the source: Establishment of NanoHttpd Android HTTP Sever:http://www.jianshu.com/p/ef6279a429d4 This article originated from the brief book, CSDN is an excellent platform, so it also appeared in CSDN. Preface Recently, I received a task to build an HTTP Server on my mobile phone for file shari ...

Has been writing server-side, recently using Netty-NIO to write chats. The web side uses JS to realize the chat interface... JS was not used very much, so I set up a JS Demo which imitated Wechat. It uses the vue.js library.   Cruel source code: About 600 lines, but it's too much for a rookie like me. There are no comments in the code, and the ...