transactions

问题 Is it possible to use multi.incr(value) with multi.hmset ? I mean: var name = 'Josh'; var multi = client.multi(); multi.incr('id'); // incr => 1 multi.hmset('user:' + <need incr value here>, 'username', name); // I want multi.hmset('user:1', 'username', 'Josh'); multi.exec(function(err,data){ .. }); My objective is to increment 'id', and then set it to a user id in a transaction. I have read, that i need to do client.watch('id') , but i don't understand how to use it. PD: Please, post your

问题 Is it possible to use multi.incr(value) with multi.hmset ? I mean: var name = 'Josh'; var multi = client.multi(); multi.incr('id'); // incr => 1 multi.hmset('user:' + <need incr value here>, 'username', name); // I want multi.hmset('user:1', 'username', 'Josh'); multi.exec(function(err,data){ .. }); My objective is to increment 'id', and then set it to a user id in a transaction. I have read, that i need to do client.watch('id') , but i don't understand how to use it. PD: Please, post your

问题 My Grails service is having an issue where a swallowed exception unrelated to a transaction is causing the transaction to rollback even when it is unrelated to the persistance of the domain object. In my service I have something along the lines of updateSomething(domainObj) { def oldFilename = domainObj.filename def newFilename = getNewFilename() domainObj.filename = newFilename domainObj.save(flush: true) try { cleanUpOldFile(oldFilename) } catch (cleanupException) { // oh well, log and

问题 My Grails service is having an issue where a swallowed exception unrelated to a transaction is causing the transaction to rollback even when it is unrelated to the persistance of the domain object. In my service I have something along the lines of updateSomething(domainObj) { def oldFilename = domainObj.filename def newFilename = getNewFilename() domainObj.filename = newFilename domainObj.save(flush: true) try { cleanUpOldFile(oldFilename) } catch (cleanupException) { // oh well, log and

问题 I've been working with importing large CSV files of data; usually less than 100,000 records. I'm working with PHP and MySQL (InnoDB tables). I needed to use PHP to transform some fields and do some text processing prior to the MySQL INSERT s (part of process_note_data() in code below). MySQL's LOAD DATA was not feasible, so please do not suggest it. I recently tried to improve the speed of this process by using MySQL transactions using START TRANSACTION and COMMIT . The performance increase

问题 I've been working with importing large CSV files of data; usually less than 100,000 records. I'm working with PHP and MySQL (InnoDB tables). I needed to use PHP to transform some fields and do some text processing prior to the MySQL INSERT s (part of process_note_data() in code below). MySQL's LOAD DATA was not feasible, so please do not suggest it. I recently tried to improve the speed of this process by using MySQL transactions using START TRANSACTION and COMMIT . The performance increase

问题 Based on this article here as well as the question: Difference Between Transaction and TransactionScope we know that TransactionScope The TransactionScope class provides a simple way to mark a block of code as participating in a transaction, without requiring you to interact with the transaction itself. A transaction scope can select and manage the ambient transaction automatically. Due to its ease of use and efficiency, it is recommended that you use the TransactionScope class when

问题 I have the following transaction using Firestore: mDb.runTransaction(new Transaction.Function<Void>() { @Override public Void apply(final Transaction transaction) throws FirebaseFirestoreException { DocumentReference documentReference = mDb.collection("collectionOne").document("documentOne"); /* some code */ transaction.update(documentReference, App.getResourses().getString(R.string.field_one), FieldValue.increment(1)); transaction.update(documentReference, App.getResourses().getString(R

问题 I have the following transaction using Firestore: mDb.runTransaction(new Transaction.Function<Void>() { @Override public Void apply(final Transaction transaction) throws FirebaseFirestoreException { DocumentReference documentReference = mDb.collection("collectionOne").document("documentOne"); /* some code */ transaction.update(documentReference, App.getResourses().getString(R.string.field_one), FieldValue.increment(1)); transaction.update(documentReference, App.getResourses().getString(R

问题 I'm currently using Mysql with InnoDB storage engine for all tables. So, I'm wondering if this is a real problem and if there's a solution for it. For example, I will charge a user using a database transaction: 1. check his balance 2. subtract his balance 3. credit this balance somewhere 4. commit What would happen if an update happens just after #1 and before 2 & 3. If the user withdraws or purchases something else that results his balance to be zero. This would have led to to lose that