transactions

问题 Command pattern can be used to implement Transactional behavior (and Undo ). But I could not find an example of these by googling. I could only find some trivial examples of a lamp that is switched on or off . Where can I find a coding example (preferably in Java )of this/these behaviors implemented using the Command Pattern ? 回答1: In one of our projects, we have the following requirement: Create a record in DB. Call a service to update a related record. Call another service to log a ticket.

问题 I am working on a project that is using Spring framework (4.3.3.RELEASE) and Hibernate (5.2.3.Final) and I am starting to move to using Spring Data JPA. I have just migrated the LocalSessionFactoryBean with HibernateTransactionManager config to using the JPA config of LocalContainerEntityManagerFactoryBean with JpaTransactionManager with HibernateJpaSessionFactoryBean . The existing hibernate code that uses Session s from SessionFactory s seemed to work fine until I tested some code that does

问题 I am trying to use 2 persistence units within the same transaction in a Java EE application deployed on Glassfish. The 2 persistence units are defined in persistence.xml, as follows: <persistence-unit name="BeachWater"> <jta-data-source>jdbc/BeachWater</jta-data-source> ... <persistence-unit name="LIMS"> <jta-data-source>jdbc/BeachWaterLIMS</jta-data-source> ... These persistence units correspond to JDBC resources and connection pools which I had defined in Glassfish as follows (include one

问题 Is there a way to do transactions with prepared statements? I mean can I use the following example with $mysqli->autocommit(FALSE); and $mysqli->commit( ); and $mysqli->rollback( ); //Preparing the statment $insert_stmt=$mysqli->prepare("INSERT INTO x VALUES(?,?)") or die($mysqli->error); //associate variables with the input parameters $insert_stmt->bind_param("is", $my_number,$my_string); //i=integer //Execute the statement multiple times.... for ($my_number = 1; $my_number <= 10; $my_number

问题 I was just think that now it is common to have enough RAM on your database server to cache your complete database why are the specialist in memory database (e.g TimesTen, see also Wikipedia page) that were all the rage a few years ago not being used more? It seems to be that as time go on, none disk based databases are being used less, e.g most applications are now built on conventional rational databases. I would have expected the opposite as RAM is getting close to being free for a lot of

问题 I was just think that now it is common to have enough RAM on your database server to cache your complete database why are the specialist in memory database (e.g TimesTen, see also Wikipedia page) that were all the rage a few years ago not being used more? It seems to be that as time go on, none disk based databases are being used less, e.g most applications are now built on conventional rational databases. I would have expected the opposite as RAM is getting close to being free for a lot of

问题 Configuration: Integration tests for Rails project using RSpec, Capybara, Selemium driver, SQLite database. Situation: I had few integration tests with Capybara and default rack_test driver. They create a user registration (for Devise gem) directly in database. Then they login and test a scenario using Capybara DSL like a user would do. Problem: I tried to change a driver to Selenium to test JavaScript code as well. Now the tests fail because application does not see a user registration that

问题 I have several integration tests for various services that extend the following baseclass: @ContextConfiguration(locations="classpath:applicationContext-test.xml") @TransactionConfiguration(transactionManager="txManager", defaultRollback=true) @Transactional public abstract class IntegrationTestBase extends AbstractTransactionalJUnit4SpringContextTests { //Some setup, filling test data to a HSQLDB-database etc } For most cases this works fine, but I have a service class which has transactions

问题 Using Oracle 10g Is it possible to get the value of a newly updated field within the same transaction before it is committed. I am executing a stored procedure which calls 2 other stored procedures. The first stored procedure gets a record from a table and then updates that record. The second stored procedure gets that same record but needs to use the newly updated fields from the first stored procedure. Then the commit is carried out. The commit can only be done if both procedures are

问题 Using Oracle 10g Is it possible to get the value of a newly updated field within the same transaction before it is committed. I am executing a stored procedure which calls 2 other stored procedures. The first stored procedure gets a record from a table and then updates that record. The second stored procedure gets that same record but needs to use the newly updated fields from the first stored procedure. Then the commit is carried out. The commit can only be done if both procedures are