transaction and concurrency control

During program development, transactions are usually used to add, delete, and modify databases for all updates and rollback. A single database is relatively easy to do. If you need to operate multiple databases at the same time, you can use the following method I. TransactionScope class The TransactionScope class is a new class in framework2.0. in the Transactions namespace, you must first add System. transactions references. In addition, you need to go to the windows

void UpdateUser (user user) {userdao.updateuser (user); System.out.println (1/0); Execution-time Exception}}7. DAO Interface:Public interface Userdao {User Finduserbyid (String id); void updateUser (user user);}8. DAO Implementations:public class Userdaoimpl extends Sqlsessiondaosupport implements Userdao {@Overridepublic User Finduserbyid (String id) {S Qlsession sqlsession = Super.getsqlsession (); User user = (user) Sqlsession.selectone (User.class.getName () + ". Selectuserbyid", id); retur

ArticleThe main content is: how to control the entire transaction when an error occurs in the stored procedure, to ensure data integrity, and to match your expectations. (Because I have not used DB2 for a long time, please give me some advice on anything wrong in this article. Thank you) 1: First prepare the test environment: Table TAA and table TBB: Code Code highlighting produced by Actipro Co

) {userdao.updateuser (user); System.out.println (1/0); Run-time Exception}}7. DAO Interface:Public interface Userdao {User Finduserbyid (String id); void updateUser (user user);}8. DAO Implementations:public class Userdaoimpl extends Sqlsessiondaosupport implements Userdao {@Overridepublic User Finduserbyid (String id) {S Qlsession sqlsession = Super.getsqlsession (); User user = (user) Sqlsession.selectone (User.class.getName () + ". Selectuserbyid", id); return user;} @Overridepublic void Upd

JDBC's transaction control Select @ @tx_isolation See how the system is executed set@ @autocommit = 1 when automatically committed. When the system executes set@ @autocommit = 0, it is not autocommit Start transaction Modify the database table at this time, and execute it correctly with commit. Commit COMMIT statement. The statement following the commit will be t

Spring MVC was used as a control-layer framework in a recent project, but there was a puzzling question: transaction control.Spring MVC's configuration file is named: Springmvc-servlet.xml, which reads as follows:the spring configuration file is named: Applicationcontext.xml and reads as follows:I think everyone is familiar with both profiles, but the problem I have is that the

;import Org.springframework.beans.factory.annotation.autowired;import Org.springframework.stereotype.controller;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.responsebody;import Cn.telchina.standard.model1.service.TestService; Import Com.alibaba.fastjson.JSON; @Controllerpublic class TestController { @Autowired private Testservice Testservice; @ResponseBody @RequestMapping ("/test") public String getjsonstring (Str

The Code for demo demo, using annotations to complete the integration of spring boot and mybatis, and to control thingsConfiguration of the data source:1 spring.datasource.url=jdbc:mysql://localhost:3306/book2 Spring.datasource.username=Root3 spring.datasource.password=4 spring.datasource.driver-class-name=com.mysql.jdbc.driverDependent Packages:1 2 3 4 5 6 7 8 9 Mapper:@Configuration Public Interface Bookmapper { @Update (

--Delete Create PROCEDURE [dbo]. [Students_delete] (@ID int) With EXECUTE as Callerasbegin --check to make sure the ID does exist--if not does, return error DECLARE @exis ting as int = 0 SELECT @existing = count (ID) from Students WHERE id = @ID IF @existing UpdateCREATE PROCEDURE [dbo]. [Students_update] (@ID int, @LASTNAME varchar (), @FIRSTNAME varchar, @STATE varchar, @PHONE varcha R (), @EMAIL varchar, @GRADYEAR int, @GPA decimal (20,10), @PROGRAM varchar, @NEWSLE

"class= "Org.mybatis.spring.SqlSessionFactoryBean"> Propertyname= "DataSource"ref= "DataSource" /> Propertyname= "Mapperlocations"value= "Classpath:com/scsmsjk/mapper/*.xml"> Property> Propertyname= "Configlocation"value= "Classpath:sqlMapConfig.xml" /> Propertyname= "Typealiasespackage"value= "Com.nhinter.entity"/> - Bean> Beanclass= "Org.mybatis.spring.mapper.MapperScannerConfigurer"> Propertyname= "Sqlsessionfactorybeanname"value= "Sqlsess

step database operation, exit Else Step three: Manipulate the log database in a transactional environment If ERR Then Roll back the first step and delete the folder created in the second step Exit End If End If End If Commit transactions for the first step of the database operation Commit transactions to the second step of the database operation End Each step needs to be judged, if it fails, you need to manually rollback the previous multi-step operation, so that the program becomes

previous multi-step operation, so that the program becomes complex and difficult to understand. If you update your program in the future and add additional steps, you will need to nest more layers of If ... Else ... End If, making the program process more complex. The correct solution is to use the ASP's transaction control capabilities. By contacting the MTS Service, IIS can

%found -Sql%notfound -Sql%isopen Note here: simply using Sql%rowcount, there is no definition of the display cursor, because this is an implicit cursor that proves that Oracle uses an implicit cursor when parsing SQL statements.3. Transaction Control StatementCOMMIT [work]; SavePoint savepoint_name; ROLLBACK [work]; ROLLBACK [Work] to [savepoint] savepoint_name; Which: seemingly work is useless.4. SELECT s

In the SSM framework it is often used to invoke stored procedures in the database, as well as transaction control, to save a document as an example, to introduce the following: 1, Oracle stored procedure Code as follows (the main logic is to automatically add the document encoding 1 and return the document encoding): CREATE OR REPLACE PROCEDURE "Update_djbhzt" (P_gsid in Varchar2, p_tblname in varc