commit rollback

1pc,one phase Commit, one stage commitThis is an ordinary transaction, only a single data source is involved.The app communicates directly with the data source, starting with a transaction, then either commit, or rollback2pc,two phase Commit, two

 Thinkphp's support for Oracle is simply weak. It only performs basic operations, and even transactions are not supported. Modify DbOracle. class. php manually today to make it easier to use.First, insert. There should be no problem with the

In the Java EE application, transactions are an indispensable component model that guarantees the ACID (i.e. atomic, consistent, isolated, persistent) properties of user operations. For applications that operate only a single data source,

At the open source conference sponsored by OReilly last August, MySQL developer Monty Widenius announced a new project called Maxsql, an enhanced version of the currently popular MySQL database. Most importantly, Maxsql combines the latest Berkeley

Jar package required: mybatis-3.x.x.jar, assuming the need to integrate with spring, also need to increase the relevant package1: do not care about the red color of the project folder.2:Follow these steps:1: Add a jar package2: create a data source (

PHP Core Knowledge Essentials, PHP core points PHP: scripting language, website building, server-side running PHP Definition: A server-side HTML scripting/programming language, is a simple, object-oriented, interpreted, robust, secure, high

Http://www.cnblogs.com/jndream/archive/2012/03/20/2407955.htmlThere are two scenarios for canceling changes to your code:The first case: The change was not committed (commit). In this case, the previous modification can be canceled using SVN revert.

1.Transaction Concept _ four characteristics First, the businessThe concept of a transaction : A transaction is a logical set of operations that either completes at the same time or is not completed at the same time .Management of transactions : By

SQL is the language used to access the Oracle database. PL/SQL expands and enhances SQL functions. It also introduces stronger Program Logic. PL/SQL supports DML commands and SQL transaction control statements. DDL is not supported in PL/SQL, which

Classic SQL statements The following statements are MSSQL statements and cannot be used in access.SQL classification:DDL-Data Definition Language (create, alter, drop, declare)DML-data manipulation language (select, delete, update, insert)DCL-Data

Thoughts on Cache Design Oceanbase-hundreds of billions of databases [Distributed System Engineering Implementation] distributed transactions Acid is a feature of standalone transactions, but in a distributed system, because the two machines

oracle032The basic principle of lock1. Oracle Lock typeThe role of the lock: to protect the data, no locks, no concurrency, locks are used to limit concurrencySlow database response is not necessarily the data negative, or the cause of the lock

It is only the individual understanding of the redo operating mechanism, the wrong place, hope Cheese point out, learn together. If you want to make your understanding of redo more clear, then you can choose to continue to watch. The fundamental

Selection of table type (storage engine)Plug-in storage engine is one of the most important features of MySQL database, users can choose how to store and index data, use transactions and so on according to the needs of the application.The storage

Scene:A product is in stock, the order is checked before the inventory, if the >0, put inventory 1 and then order, if Select from the products where id=3set quantity = ($quantity-1) where id=3;In the concurrency situation, the inventory may be

This article mainly analyzes the plug-in mechanism of MyBatis, which is actually the implementation of the responsibility chain mode implemented by Java dynamic proxy.According to the official documentation. Mybatis can only intercept the following

Today, database operations are increasingly becoming the performance bottleneck of the entire application, especially for Web applications. Concerning the performance of the database, this is not just something that DBAs need to worry about, but it

DB::beginTransaction(); foreach($checkArr[0] as $v){ $id = explode('-',$v)[0]; $rank = explode('-',$v)[1] != '' ? explode('-',$v)[1] : 5; if(index_friendlink::where('id','=',$id)->pluck('online') == 1){

The difference between MySQL's storage engine MyISAM and InnoDB How do you usually choose these 2 types in a specific project? ------Solution-------------------- MyISAM: This is the default type, which is based on the traditional ISAM type, ISAM is

(Monty gave a speech at OReillyOpenSourceConvention2000.) [compile and organize Yan Zi] I. what can and should we optimize? Hardware operating system software database SQL Server (setup and query) application programming interface (API) Application -