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MySQL exists on the update, does not exist on the new

INSERT into Newest_log_operation (ACTION, operation, Key_value, Bus_key, CONTENT, user_id, VERSION, Module,create_time)VALUES (: Action,: Operation,: KeyValue,: Buskey,: Content,: UserId, 1,: Module,now ())On DUPLICATE KEY UPDATEAction = values

Gradle Tutorial Description User Guide Chapter 7th Quick Build Java Engineering

Website address: http://www.gradle.org/docs/2.1/userguide/tutorial_java_projects.htmlUsing the Java pluginA basic Java Project with a basic Java engineeringusing the Java plugin in Build.gradle:Apply plugin: ' java 'Building The project construction

Unix/linux interprocess communication (ii): Anonymous pipe, well-known pipe pipe (), Mkfifo ()

1, pipeline overview and related API application1.1 Key concepts related to pipingThe pipeline is one of the original UNIX IPC forms supported by Linux and has the following features: The pipe is half-duplex, the data can only flow in one

Java optimistic lock vs pessimistic lock

As described in the lock mechanism of a database, the task of concurrency control in a database management system (DBMS) is to ensure that the same data in the database is accessed simultaneously without disrupting the isolation and uniformity of

A sample of stored process learning for integral acquisition and consumption _mssql

1.GM_JF Customer account Integration form 2. Gm_jf_detail customer account points consumption record 3. Gm_jf_action _rules integral Action Rules table 4.gm_jf_goods _rules integral Commodity rules table Copy Code code as follows: --=

Solution of high concurrent system data power and so on _mssql

Objective In the system development process, often encountered data repeatedly inserted, repeated updates, message resend, and so on, because the application of complex logic and network interaction uncertainty, can lead to this duplication, but

How much is the minimum configuration of a computer fleeing death island? How much is the recommended configuration?

Game Introduction: "Escape from Death Island" is a cartoon style third-person action adventure game developed by the Swedish studio Fatshark, Deep silver. The protagonist will face the danger of zombie and all kinds of difficulties and hardships,

asp.net Core MVC Configuration Global Routing prefix _ Practical tips

asp.net Core MVC configuration global route prefix Objective Hello everyone, today we introduce a new feature of ASP.net Core MVC, which adds a unified prefix to global routing. Strictly speaking, it is not a new feature, but it is unique to core

The difference between optimistic lock and pessimistic lock

the difference between optimistic lock and pessimistic lock Reference:http://www.hollischuang.com/archives/934http://m.blog.csdn.net/article/details?id=26004335 optimistic Lock In the relational database management system, optimistic concurrency

SQLi Filter Evasion cheat sheet (MySQL)

This week I presented my experiences in SQLi filter evasion techniques that I had gained during 3 years of Phpids filter Evasion at the CONFidence 2.0 conference. You can find the slides here. For a quicker reference your can use the following

The difference between MySQL 5.5 and 5.6 timestamp field DEFAULT current_timestamp on UPDATE current_timestamp

Http://www.111cn.net/database/mysql/55392.htmThis article is to give you the difference between MySQL 5.5 and 5.6 timestamp field DEFAULT current_timestamp on UPDATE current_timestamp, I hope this tutorial will be helpful to you.mysql5.6 Database:

The simultaneous creation and last update timestamp fields in MySQL solution analysis

before writing this article, make clear my MySQL version. Mysql> SELECT VERSION (); +------------+| VERSION () |+------------+| 5.5.29-log |+------------+1 row in Set (0.00 sec)There is now a requirement that a table has a field created_at records

MySQL optimistic lock

MySQL pessimistic lock is based on the lock mechanism of the database to achieve the maximum degree of exclusivity. However, because the modern web system is generally high concurrency, so pessimistic lock in such circumstances, the applicability is

Lucene Foundation (iv)--combined with database usage

DemandMost of the time we use the database needs fuzzy query, we usually use like statement to do, but this is not a lot of efficiency (I'm sorry we personally to test, many say so), then using Lucene to retrieve the words, the efficiency will be

MYSQL8 Installation Record

Operating Environment: centos6.6+mysql8.0.121. Download the official packaged binary installation package:#wget HTTPS://CDN.MYSQL.COM//DOWNLOADS/MYSQL-8.0/MYSQL-8.0.12-LINUX-GLIBC2.12-X86_64.TAR.XZYou can see that this version uses the TAR.XZ

MySQL Operations management-mysql database storage engine Knowledge 19

1.MySQL Engine Overview 1.1 What is a storage engineWhen we record a video file, it can be converted to different formats such as mp4,avi,wmv, and on the computer's disk will also exist in different types of file system Windows common Ntfs,fat32,

Build a ceph Deb installation package

first, compile the Ceph package 1.1. Clone the Ceph code and switch branches git clone--recursive https://github.com/ceph/ceph.git cd ceph git checkout v0.94.3-fNote: Recursive will clone the module together 1.2. Installing dependent Packages

Pessimistic locks and optimistic locks for database transactions

Reprint Source: http://www.hollischuang.com/archives/934As described in the lock mechanism of a database, the task of concurrency control in a database management system (DBMS) is to ensure that the same data in the database is accessed

Linux kernel Configuration and compilation

Configure the kernel: Configure the hardware and software required sections.Make config: Interactive configuration based on text mode. (One question and one answer)Make Menuconfig: Based on the text-mode menu configuration. (intuitive, simple and

InnoDB pessimistic lock, optimistic lock

Turn http://www.cnblogs.com/chenwenbiao/archive/2012/06/06/2537508.htmlCREATE TABLE ' products ' (' ID ' )int( One) not NULL auto_increment, ' name ' varchar ( the) not NULL, ' quantity 'intNot NULL, ' cityid ' varchar ( -DEFAULT NULL, PRIMARY key ('

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