rollback transaction

1, Pom.xml in the introduction of relevant dependencies UTF-8 1.7 1.7 - org.springframework.data 1.11.4.RELEASE -- org.hibernate 5.1.7.Final hibernate-entitymanager -- mysql mysql-connector-java 5.1.42 ju nit junit 3.8.1 test 2. JPA

Four characteristics of transaction transaction ACID MySQL operation transaction in JDBC operation transaction Transaction Overview 1, what is transaction bank transfer. John turn 1000 to Dick. Requires two SQL statements to the John account minus 10

four characteristics of the transaction (ACID):  atomicity (atomicity): All operations in a transaction are not divisible atomic units. All operations in a transaction are either successfully executed or all fail.  Consistency (consistency):

See a lot of people talking about SQL is also divided into four types, where the knowledge is popular, and summed up their differences. 1. Ddl–data Definition Language Database Definition language: Defines the structure of a database. The main

this article python version 3.5.3,mysq version 5.7.23Basic use# Imports Pymysql Module Import pymysql# Connection Database conn = Pymysql.connect ( database= "database name", user= " username", password= "password", host= "The address

#事务 & Database Connection pool &dbutils# #事务 > Transaction actually refers to a set of actions that contain many single logic. As long as there is a logic that does not execute successfully, it is a failure. All data is returned to the original

Mason today in the group of discussion, DDL or DML, I this small white or summed up their differences.1. Ddl-data Definition LanguageDatabase Definition language: Defines the structure of the database. The main orders are Create,alter,drop, and so

A transaction executes a sequence of operations as a unit, either succeeds or fails, and rolls back to its original state. In transactional terminology, a transaction is either committed or aborted. To commit a transaction, all participants must

-----------------------------The SQL statement for the database-------------------------1. DatabaseCreating the CREATE Database Data_nameOn primary(Name=, Filename=, size=, maxsize=, filegrowth=),Filegroup [Auxiliary file group name](Name=, Filename=

It is recommended that you read the stored procedure first: SQL Server stored ProcedureØ BusinessIn a database, it is sometimes necessary to run instructions from multiple steps as a whole that either succeeds or fails altogether, which requires a

I. Create a database, create tables, and add constraints. 1.1 database creationCopy codeThe Code is as follows:Use masterGoIf exists (select * from sysdatabases where name = 'mydatabas')-determine whether the database name to be created exists in

TEPHRA provides globally consistent transactional support (Tengyun technology ty300.com) based on Apache HBase. HBase (Getting Started tutorial qkxue.net) provides strong consistent row-and region-based ACID operation support, but at the expense of

1. What is a transaction? A transaction is a mechanism and a sequence of operations. It contains a set of database operation commands, and all commands are submitted to the system as a whole. Or cancel the operation request, that is, this group

The previous programming habits have never been quite good. Whether it is writing C, C ++, C #, or database scripts, debugging and testing are generally successful, and no exception handling such as try/catch is added. Now, for good programming

Common Database interview questions and database questions Paradigm 1: Each column in a database table is a basic data item that cannot be further divided. values or duplicate attributes are not allowed. For example, if a table contains a phone

1. Basic concepts of transactions A transaction is a logical unit of work composed of a series of tasks. All tasks in this logical unit must be completed or all fail as a whole. In SQL Server, no matter whether or not begin transaction is

There may be fewer explicit use of dynamic proxies, but when it comes to spring interceptor and various transaction management, you will be more familiar with them. That's right, these are at the underlying implementation level, dynamic proxies are

This article describes how to use python to operate databases. I. basic database operations 1. to allow Chinese writing in the database, run the following command when creating the database: create database zcl charset utf8; 2. view the students

In-depth analysis of dynamic proxy (on) proxy Methods There may be fewer explicit use of dynamic proxies, but when it comes to Spring Interceptor and various transaction management, you will be more familiar with them. That's right, these are at the

first, the concept of business　　a transaction is a logical set of actions that make up the units of this set of operations, either all succeed or all are unsuccessful.For example: a--b transfer, corresponding to the following two SQL