transactions

问题 Good day! I've run into a head burner. My client requires me to repurpose a python program to work with MySQL instead of Microsoft's SQL Server. I'm having trouble finding an equivalent solution in SQL. I can't seem to create a proper update lock on a row. When two identical transactions execute simultaneously, they both read the row despite opening a transaction at the serialize isolation level, and with SELECT ... FOR UPDATE. Maybe my code will explain it better: execute("SET TRANSACTION

问题 I am deploying on cloud functions, and getting this error Error: Cannot modify a WriteBatch that has been committed. at WriteBatch.verifyNotCommitted (/user_code/node_modules/firebase-admin/node_modules/@google-cloud/firestore/build/src/write-batch.js:112:19) at WriteBatch.update (/user_code/node_modules/firebase-admin/node_modules/@google-cloud/firestore/build/src/write-batch.js:299:14) at Transaction.update (/user_code/node_modules/firebase-admin/node_modules/@google-cloud/firestore/build

问题 To test some database pieces of a work project, I decided test it using triggers due to a nightly job. The nightly job Wipes everything from temporary tables repopulates those tables from an outside database merges the temp tables into primary tables a couple other jobs For the purposes of these tests I am not inclined to alter the source databases, but as the nightly job wipes the tables I cant just put values in which would work for my tests. Due to the load processes, once they are

问题 Good day, This is an update to my old post at SQL Simultaneous transactions ignore each other's locks??? DEADLOCK [InnoDB, Python], as I realized later that the issue had nothing to do with what I thought the problem was. I'm trying to create the MySQL equivilent to a T-SQL based script for a client. I have two identical scripts, Alice and Barry running concurrently. Their goal is to SELECT * FROM job WHERE status = 0 LIMIT 1 FOR UPDATE UPDATE job SET status = 1 where jobIDs match, do some

问题 Please explain me if I understood correctly Spring documentation. Spring docs states: https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#jms-tx (...)When you use the JmsTemplate in an unmanaged environment, you can specify these values ( transaction and acknowledgment modes ) through the use of the properties sessionTransacted and sessionAcknowledgeMode. When you use a PlatformTransactionManager with JmsTemplate, the template is always given a transactional

问题 I'm trying to track down why a db query got screwed in SQL Server (just the one time). dbcc log(mydb,2) is not filterable by date(?). And the ldf file I can't access directly without going through 2 layers of bureaucracy Any suggestions? Other than installing some 3rd party proprietary log file viewer. 回答1: You may apply ORDER BY, WHERE et al usual SQL (is not it filtering language?) to SELECT * FROM fn_dblog(null,null) It is undocumented (not in BOL) feature but google gives a plethora of

问题 I have recently migrated to JPA 2.0 (EclipseLink 2.4.2 Juno) in TomEE 1.7 in Eclipse IDE, As i am storing the values they are getting stored and retrieved fine, but they are not persisting into the database when is use entitymanager.flush() it is showing javax.persistence.TransactionRequiredException Here is my code Create.java (register method) public static int register(String first, String last, String email, String date, String phone, String address, String pin, Login login) { try {

问题 I have written a bit of code that allows a user to upvote / downvote recipes in a manner similar to Reddit. Each individual vote is stored in a Firestore collection named votes , with a structure like this: {username,recipeId,value} (where value is either -1 or 1) The recipes are stored in the recipes collection, with a structure somewhat like this: {title,username,ingredients,instructions,score} Each time a user votes on a recipe, I need to record their vote in the votes collection, and

问题 I am making an app in java that uses Netsuite's SuiteTalk web services to create a report. I defined a transaction saved search in which I use as a criteria the date and I print in the results the default Transaction columns plus the Department external ID and the sum of the amount. I run the saved search via UI and I get what I am expecting, however, when I try to get the information in my java code I keep getting null results. I have tried the java versions of the following solutions: C#

问题 I have a the following use case where I'm receiving a message via JMS regarding an entity, via a unique property of it (not PK) and it requires me to update the state of the entity: HibernateUtil.beginSession(); HibernateUtil.beginTransaction(); try{ Entity entity = dao.getEntityByUniqueProperty(propertyValue); if (entity==null){ entity = dao.addEntityByUniqueProperty(propertyValue) } entity.setSomeProperty(otherPropertyValue); HibernateUtil.commitTransaction(); } catch