transactions

问题 Does having TransactionAttributeType.NOT_SUPPORTED on every DB lookup method makes sense? I don't see the point in having the entity attached if it's not going to execute an update. @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) pubic List<AnEntity> getListEntities(){ TypedQuery<AnEntity> query = em.createNamedQuery("AnEntity.myQuery",AnEntity.class); return query.getResultList(); } Does it still end up in the cache? The only time it seems useful to use the REQUIRED transcation

问题 I have a simple transaction that updates a Firestore document. It works correctly on Android devices, Android Emulators and iOS emulators, but crashes on a physical iOS device : Firestore.instance.runTransaction((Transaction tx) async { DocumentSnapshot docSnapshot = await tx.get(docRef); tx.update( docRef, { 'title':'A Title' }, ); } Error: -[NSError init] called; this results in an invalid NSError instance. It will raise an exception in a future release. Please call errorWithDomain:code

问题 Does Ehcache 2.1 now support the transactional cache concurrency strategy in Hibernate 3.3.2GA? That is, does Hibernate, when configured to use Ehcache 2.1 as its cache provider, allow the <cache usage="transactional"/> element in a mapping file or the Hibernate entity class annotation @Cache(usage=CacheConcurrencyStrategy.READ_WRITE) ? 回答1: According to the Ehcache Home Page page, Ehcache 2.1+ does now support all Hibernate strategies: 17 May 2010: Ehcache 2.1.0 and new ehcache-nonstopcache

问题 I have following configuration. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <bean id="dataSource" class="org.springframework.jdbc.datasource

问题 I have a question regarding mysql commits and transactions. I have a couple of php statements that execute mysql queries. Do I just say the following? mysql_query("START TRANSACTION"); //more queries here mysql_query("COMMIT"); What exactly would this do? How does it help? For updates, deletes and insertions I also found this to block other queries from reading: mysql_query("LOCK TABLES t1 WRITE, t2 WRITE"); //more queries here mysql_query("UNLOCK TABLES t1, t2"); Would this block other

问题 As I understand it, all transactions are Thread-bound (i.e. with the context stored in ThreadLocal). For example if: I start a transaction in a transactional parent method Make database insert #1 in an asynchronous call Make database insert #2 in another asynchronous call Then that will yield two different transactions (one for each insert) even though they shared the same "transactional" parent. For example, let's say I perform two inserts (and using a very simple sample, i.e. not using an

问题 As I understand it, all transactions are Thread-bound (i.e. with the context stored in ThreadLocal). For example if: I start a transaction in a transactional parent method Make database insert #1 in an asynchronous call Make database insert #2 in another asynchronous call Then that will yield two different transactions (one for each insert) even though they shared the same "transactional" parent. For example, let's say I perform two inserts (and using a very simple sample, i.e. not using an

问题 In my understanding PostgreSQL use some kind of monitors to guess if there's a conflict in serializable isolation level. Many examples are about modifying same resource in concurrent transaction, and serializable transaction works great. But I want to test concurrent issue in another way. I decide to test 2 users modifying their own account balance, and wish PostgreSQL is smart enough to not detect it as conflict, but the result is not what I want. Below is my table, there're 4 accounts which

问题 So I have been playing with NodeJS/Express for a little with now and I would really like to try to rewrite a relatively large side project using a full JavaScript stack just to see how it will work. Sails.js seems to be a pretty good choice for a NodeJS backend for a REST API with support for web sockets which is exactly what I am looking for however is one more issue I am looking to resolve and that is transactional SQL within NodeJS. Most data layer/orms I have seen on the NodeJS side of

问题 So I have been playing with NodeJS/Express for a little with now and I would really like to try to rewrite a relatively large side project using a full JavaScript stack just to see how it will work. Sails.js seems to be a pretty good choice for a NodeJS backend for a REST API with support for web sockets which is exactly what I am looking for however is one more issue I am looking to resolve and that is transactional SQL within NodeJS. Most data layer/orms I have seen on the NodeJS side of