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Pessimistic locking is not suitable for any scenario, it also has some shortcomings in its existence, because pessimistic locks rely on the database lock mechanism in most cases to ensure the maximum degree of exclusivity of the operation. If the

Case Description:Two operators of the bank operate the same account simultaneously.For example, A, B operators simultaneously read a balance of 1000 yuan account, a operator for the account increase of 100 yuan, b operator at the same time for the

Reprint http://chenzhou123520.iteye.com/blog/1863407The previous article, "MySQL pessimistic lock summary and practice" talked about the MySQL pessimistic lock, but pessimistic lock is not suitable for any scenario, it also has some shortcomings,

The previous article, "MySQL pessimistic lock summary and practice" talked about the MySQL pessimistic lock, but the pessimistic lock is not suitable for any scenario, it also has some shortcomings of its existence,Because pessimistic locks are

The previous article, "MySQL pessimistic lock summary and practice" talked about the MySQL pessimistic lock, but pessimistic lock is not suitable for any scenario, it also has some shortcomings, because pessimistic lock in most cases rely on the

Software level: Update time:2014-05-08 00:00:00 Software classification: System Tools / system backup Software Size: 6.2MB Software Category: Domestic software Software Licensing: Free version Software language: Simplified

  Optimistic lock:   Optimistic lock example http://xmuzyq.javaeye.com/blog/295639Method 1. JDBC uses the following statement:Select a. version... from account as a where (where condition ..)Update account set version = version + 1... (another field)

Source codeThere are two projects, one is versionloader. One is mainframe.Versionloader is responsible for loadingFrame, and for version identification.Versionloader uses XML filesObtain the Server File version. Compare with the file stored locally

Reprinted from: http://www.cnblogs.com/gavincome/archive/2007/12/15/995665.html   1,Public void getfileversion (){// Get the file version for the notepad.Fileversioninfo myfileversioninfo = fileversioninfo. getversioninfo ("% SystemRoot % // notepad.

Remark Overview When downloading source code outside China, you can often see the accompanying instructions and detailed instructions. Most documents can be generated using the cross-platform software doxygen, doxygen cannot read your c ++ comments

Objective:In the previous project with nearly a year of Rap,rap is open source from Ali, very useful. GitHub Address: Https://github.com/thx/RAP.When using this tool, the project members need to be in the interface document after the change, send

Optimistic lock and pessimistic lock-solve concurrency problems and concurrencyIntroduction Why do I need to lock (Concurrency Control )? InMulti-User Environment. This is a well-known concurrency problem. Typical conflictsInclude: Update loss:

This is mainly a demonstration operation on Win7 64. Web application Building Memcached installation Configuration Start Tomcat Configuration Required JAR Packages

PHP Version Processing class For example, recording the app version, or some version of the data, if you use 1.0.0 this version format to record the storage, when you need to filter the query will be more troublesome.Instead of converting the

BackgroundAs the open source framework is becoming richer, many of the log components used by open source frameworks are different. exist in a project, different versions, different frameworks coexist. Causes the log output to be unusually chaotic.

Javadoc Annotation Specification 1. Comment classification 2. Java Documentation and Javadoc 3. Format of document annotations 3.1 Formatting of document and document annotations 3.2 Part Three of the documentation

#!/bin/bash Error_check () {if [$1-ne 0];then echo "$" Exit $ fi} copy_file () {cp-f- A-v $ Error_check $? ' Not Found '} rm_file () {for file in $@;d o if [-E "$file"];then rm-vf $file fi Done} rm_dir () {to dir in $@;d o if [d "$dir"];then

 Shellscript Common script:ForLoopsWheil Many loops can be replaced with a for loopFor loop syntax structureFor variable name in variable Value listDoinstructionDoneFor ((EXP1;EXP2;EXP3))DoinstructionDoneScript instance:For 99multiplication

First, IntroductionApplication to synchronize Oracle updates and delete data, consider using Oracle's flashback query mechanism.This mechanism first requires Oracle to enable the automatic management of the undo table space Rollback information, and

AOP is required in the project using the Runkit module, but the development environment for the team members is Windows, and the Runkit module does not provide DLL extensions in the Windows environment and compiles itself only.The following is a