transactions

问题 I had tried to add or remove the '@' before variables or params but nothing happened. QUERY start transaction; set @recordClient = (select ClientId from by_test_db1.recordcd where SN = 'abc' ); set @logClient = (select ClientId from by_test_db1.log where SN = 'abc' ); select concat(@recordClient,@logClient); commit; SP delimiter $$ create procedure TEST(newSN varchar(50)) begin start transaction; set @recordClient = (select ClientId from by_test_db1.recordcd where SN = newSN ); set @logClient

问题 I'm a bit stuck here trying to copy lots of data (a million records total) from three related tables to other three related tables in the same database. My table design is as follows: What I need is to be able to copy data from the draft tables over to the non-draft tables in one transaction which I'm able to roll back if anything goes wrong. This is needed because we don't want i.e. Billing and BillingPriceLine records to exist in the database, if the bulk insertion of

问题 I have 2 data source and in a method, I need to write and read from the 2 databases. The database is PostgreSQL and my EAR app runs on wildfly-16. I can't use 2 database connection in the same method Ok, I know that because the system can't manage a transaction across the different database. So I splitted the methods in my ejb : @TransactionAttribute(TransactionAttributeType.NEVER) public Response mainMethod(String parameter) { method1(); method2() } @TransactionAttribute

问题 I have 2 data source and in a method, I need to write and read from the 2 databases. The database is PostgreSQL and my EAR app runs on wildfly-16. I can't use 2 database connection in the same method Ok, I know that because the system can't manage a transaction across the different database. So I splitted the methods in my ejb : @TransactionAttribute(TransactionAttributeType.NEVER) public Response mainMethod(String parameter) { method1(); method2() } @TransactionAttribute

问题 I am quite not understanding the lock functionality with SELECT FOR UPDATE. Here is what I've tried. CREATE TABLE ACCOUNT_TAB ( ACC_ID int NOT NULL PRIMARY KEY, BALANCE int NOT NULL ); INSERT INTO ACCOUNT_TAB VALUES(1, 100); SELECT * FROM ACCOUNT_TAB FOR UPDATE; SELECT * FROM ACCOUNT_TAB; Both SELECT will retrieve the row, but shouldn't the first query lock the row in the ACCOUNT_TAB table? I have read something about sessions: queries from the same session don't care about the lock. Can I

问题 I'm writing an application in Node.js using PostgreSQL as database. But I have some problems. I have a table with information about resources in region: CREATE TABLE regions_indexes ( id integer NOT NULL, resource_type integer NOT NULL, current_resource integer, maximum_resource integer, CONSTRAINT regions_indexes_pkey PRIMARY KEY (id, resource_type) ) Users clicks on button, application calculates various parameters based on current_resource and then do current_resource - $calc_value.

问题 I'm writing an application in Node.js using PostgreSQL as database. But I have some problems. I have a table with information about resources in region: CREATE TABLE regions_indexes ( id integer NOT NULL, resource_type integer NOT NULL, current_resource integer, maximum_resource integer, CONSTRAINT regions_indexes_pkey PRIMARY KEY (id, resource_type) ) Users clicks on button, application calculates various parameters based on current_resource and then do current_resource - $calc_value.

问题 I'm writing an application in Node.js using PostgreSQL as database. But I have some problems. I have a table with information about resources in region: CREATE TABLE regions_indexes ( id integer NOT NULL, resource_type integer NOT NULL, current_resource integer, maximum_resource integer, CONSTRAINT regions_indexes_pkey PRIMARY KEY (id, resource_type) ) Users clicks on button, application calculates various parameters based on current_resource and then do current_resource - $calc_value.

问题 Which informations obtained from IPN you should keep inside your local Database ? Is the $_POST['txn_id'] field the only field needed to assure you a retrack of all the transaction informations from paypal? Or is it better to insert all informations obtained from the IPN/PDT postback? Basically i'm trying to figure out wich info I need to store in case of a transaction problem and/or a user complaint. 回答1: No, the txn_id isn't enough. According to the documentation PayPal provides on their

问题 I am currently implementing a REST API web service using the Dropwizard framework together with dropwizard-hibernate respectively JPA/Hibernate (using a PostgreSQL database). I have a method inside a resource which I annotated with @UnitOfWork to get one transaction for the whole request. The resource method calls a method of one of my DAOs which extends AbstractDAO<MyEntity> and is used to communicate retrieval or modification of my entities (of type MyEntity ) with the database. This DAO