transactions

问题 Can anyone provide an example of how I could achieve MySQL transactions in Node.js. I am trying to get my head around using the node-mysql driver and node-mysql-queue. As far are I can tell, using node-mysql-queue greatly reduces the asynchronous nature of Node.js as new queries have to wait until existing ones have completed. To get around this, has anyone attempted to combine node-mysql-queue with node-mysql's connection-pooling capabilities. i.e starting a new mysql connection for each new

问题 Profiled with SQL Server Profiler: EF 6 wraps every single stored procedure call with BEGIN TRAN and COMMIT TRAN . Is not it a breaking change? Maybe it is not only a breaking change, but makes any transactional logic impossible in SPs as we never can rollback our transaction in the stored procedure using ROLLBACK TRAN (note: there are no nested transactions in SQL Server), so one rollback rollbacks to @@TRANCOUNT zero. As we were in a transaction because EF 6 we got "Transaction count after

问题 Profiled with SQL Server Profiler: EF 6 wraps every single stored procedure call with BEGIN TRAN and COMMIT TRAN . Is not it a breaking change? Maybe it is not only a breaking change, but makes any transactional logic impossible in SPs as we never can rollback our transaction in the stored procedure using ROLLBACK TRAN (note: there are no nested transactions in SQL Server), so one rollback rollbacks to @@TRANCOUNT zero. As we were in a transaction because EF 6 we got "Transaction count after

问题 Node.js 7 and up already support async/await syntax. How should I use async/await with sequelize transactions? 回答1: let transaction; try { // get transaction transaction = await sequelize.transaction(); // step 1 await Model.destroy({where: {id}, transaction}); // step 2 await Model.create({}, {transaction}); // step 3 await Model.update({}, {where: {id}, transaction }); // commit await transaction.commit(); } catch (err) { // Rollback transaction only if the transaction object is defined if

问题 Node.js 7 and up already support async/await syntax. How should I use async/await with sequelize transactions? 回答1: let transaction; try { // get transaction transaction = await sequelize.transaction(); // step 1 await Model.destroy({where: {id}, transaction}); // step 2 await Model.create({}, {transaction}); // step 3 await Model.update({}, {where: {id}, transaction }); // commit await transaction.commit(); } catch (err) { // Rollback transaction only if the transaction object is defined if

问题 I created a table in my SQL Server 2005 database and populated it with summary and calculated values. The purpose is to avoid extensive joins and groupings on every call to the database. I would like this table to refresh every hour, but I am not sure the best way to do this while the website is under load. If I delete every record and repopulate the table in one transaction will that do the trick or will there be deadlocks and other trouble lurking? 回答1: The way I have done this in a few

问题 If I use the command SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED and then execute a stored procedure using the EXEC storedProcedureName on the same context, will the stored procedure use the transaction level stated previously or will use a default one? If I want to force every stored procedure to use on transaction level do I have to include at the top of the code the same statement ( SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED )? PS.: the system is built on top of .NET 2.0 and

问题 I'm using Spring 3.1.1.RELEASE, Hibernate 4.1.0.Final, and JPA 2.0. Is there a way I can configure Spring transactions to commit after the transactions are executed without Java code? In other words, I would like to set flush mode to commit in either the application context file, hibernate configuration file, or persistence.xml file. My Spring transaction service class looks like @Transactional(rollbackFor = Exception.class) @Service public class ContractServiceImpl implements ContractService

问题 Consider this simplified view of some code with which I'm working: @Stateless(...) @Remote(...) @TransactionAttribute(TransactionAttributeType.MANDATORY) public class FirstEjbType { @EJB(...) private SecondEjbType secondEjb; @EJB(...) private ThirdEjbType thirdEjb; public void doSomething() { secondEjb.doSomething(); // WRITES SOMETHING TO THE DATABASE thirdEjb.doSomething(); // CAN'T SEE THAT SOMETHING IN THE DATABASE! } I've set the TransactionAttribute annotation to MANDATORY at the class

问题 When we use a transaction in Redis, it basically pipelines all the commands within the transaction. And when EXEC is fired, then all the commands are executed together, thus always maintaining the atomicity of multiple commands. Isn't this same as pipelining? How are pipelining and transaction different? Also, why does not the single threaded nature of Redis suffice? Why do we explicitly need pipelining/transaction? 回答1: Pipelining is primarily a network optimization. It essentially means the