transactions

问题 class DispatchAdmin(admin.ModelAdmin): def delete_model(self, request, obj): a.delete() b.delete() def save_model(self,request,obj,form,change): x.save() y.save() __ _ __ _ __ How can I _ __ _ ____ how can I make the operation to the mysql database as a atomic operation by using the transaction? what should be "import",and if the action is failed, how to rollback?(notes:since I use django admin,there is no extra views.py) 来源： https://stackoverflow.com/questions/19003442/how-to-use-transaction

问题 Can anyone show me a example for multiTenant Database with Hibernate and using spring Hibernate Txmanager for tx Mgmt. My requirements are thers master database which is always open and contains info about tenant Db. on hitting master for first time get db info of specific tenant and generate session ZFactory for the tenant and rest request shall be served via tenant Sessions. i have implementated but cudn't get my transaction manager working for tenant Dbs. <property name="packagesToScan">

问题 I have defined a function like this - ... DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK; DECLARE EXIT HANDLER FOR SQLWARNING ROLLBACK SET error_key = 1 AND error_message = 'Failed -- Rollback.'; BEGIN SELECT 'Insert Failed.'; CALL log_error(error_key, error_message); END ; START TRANSACTION; DECLARE EXIT HANDLER FOR 1062 SET error_key = 02 AND error_message = 'Insert Failed'; BEGIN SELECT 'Attempt to create a duplicate entry in the follow table.'; CALL log_error(error_key, error_message);

问题 Django’s TestCase class wraps each test in a transaction and rolls back that transaction after each test, in order to provide test isolation. Apparently, however, only operations in the default database are within the scope of the transaction. I have a multiple database setup with a router that directs ORM calls on some models to a second database. This means that in the following example, test2 fails: class MyTestCase(TestCase): def test1(self): # Let's say Foo model ORM calls are routed to

问题 I'm very new to programming and have been building my company's inventory database on MS Access 2016. I've been able to get by just fine with macros so far, but I'm trying to run a transaction made of append and delete queries and am struggling with the vba code. I figured out how to run a transaction where the queries fail on error. However, the append query I'm trying to include in the transaction is drawing values from a blank form, and as far as I can figure out, that means I need to

问题 I have been trying to create a transaction via the MarkLogic REST API (/v1/transactions) using the Developer guidance here: https://docs.marklogic.com/REST/POST/v1/transactions When I try to call the transaction REST service to create a new transaction (I am using CURL), then I receive the following HTTP Response: curl -X POST -d "" -i --anyauth --user user:password http://localhost:7010/v1/transactions HTTP/1.1 401 Unauthorized WWW-Authenticate: Digest realm="public", ... Content-type:

问题 Is it possible that if the connection to a db resource is lost during commit, which might lead to failed commit followed by failed rollback, the transaction is partially committed ? This appears to be happening in my case but wanted better clarity on this from the community. HibernateTransactionManager and Oracle are being used with JDBC drivers. 回答1: No (barring a serious bug in Oracle or unless we are talking about a distributed transaction). If a connection between the client and the

问题 In my application I use the following pattern for calling the DB: //do a transaction using (TransactionScope transaction = new TransactionScope(TransactionScopeOption.Required)) { OperationOnDb1(); //when we open the connection to the “other db” in this call, the transaction would become distributed OperationOnDb2(); //transaction is now distributed transaction.Complete(); } The problem is that Operation1 and Operation2 90% of the time use the same db ... but there are cases (bugs) when they

问题 I know about container managed transactions(CMT). I also know about the different possible values of the enumerated type TransactionAttributeType . Since the client never calls a MDB directly, the attribute types other than the REQUIRED and NOT_SUPPORTED do not make sense for MDB's as there is no client initiated transaction to join to. So when should I annotate the onMessage() method of an MDB with REQUIRED vs NOT_SUPPORTED ? What will be the default behavior in none of the two options is

问题 The question might sound vague but I'm trying to understand the general concept of the EHCache transaction ability. Assuming I configure EHCache as a memory cache and I also configure it to cache a MyObject . Does EHCache clone the instance of MyObject I'm retrieving if this is done as a part of a transaction? I'm mainly asking because I was advised (in the answer to my question) to use EHCache and I'm worried about its performance impact. MyObject is a medium-weight object and I'd rather not