persistence

问题 i have a php page, on that page i have text boxes and a submit button, this button runs php in a section: if(isset($_POST['Add'])){code} This works fine here and in that section $name,$base,$location etc are calculated and used. but that section of code generates another submit button that drives another section of code. it is in this second section of code that i wish to add data to the DB. Now i already know how to do this, the problem is that the variables $name and so forth have a value

问题 When I implement this part of this python code in Azure Databricks: class clustomTransformations(Transformer): <code> custom_transformer = customTransformations() .... pipeline = Pipeline(stages=[custom_transformer, assembler, scaler, rf]) pipeline_model = pipeline.fit(sample_data) pipeline_model.save(<your path>) When I attempt to save the pipeline, I get this: AttributeError: 'customTransformations' object has no attribute '_to_java' Any work arounds? 回答1: It seems like there is no easy

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I have a java web app that makes back-end use of a third-party web service. Calling the web service creates latency, which is important to avoid whenever possible. Also, my app is only allowed to make a certain

问题 I have iCloud in my app. I've removed iCloud from my app, but on ios 6 app crashes and I get this message: -[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:](1055): CoreData: Ubiquity: Error: A persistent store which has been previously added to a coordinator using the iCloud integration options must always be added to the coordinator with the options present in the options dictionary. If you wish to use the store without iCloud , migrate the data from

问题 Is there a way to map a calculated property using JPA? Assuming I have an Invoice object with one or more InvoiceLineItems within it, I want to have a persistent calculated property on the Invoice class that gives me the total amount: class Invoice { ... @Column(name = "TOTAL_AMOUNT") public BigDecimal getTotalAmount() { BigDecimal amount = BigDecimal.ZERO; for (InvoiceLineItem lineItem : lineItems) { amount = amount.add(lineItem.getTotalAmount()); } return amount; } } Now, I could create a

问题 I am attempting to store the change made to my application's properties. The .properties file is located in resources package, which is different from the package that contains my UI and model. I opened the package using: this.getClass().getClassLoader().getResourceAsStream("resources/settings.properties") Is there a functional equivalent of this that permits me to persist changes to the Properties Class in the same .Properties file? 回答1: It sounds like you want to store user preferences.

问题 I want to know the differences/similarities between Hibernate and simple persistence in Java EE 5? I'm not clear if Hibernate implements Java EE 5 persistence implementation or if it is a totally different approach to data representation over back-end systems. I'm confused about Hibernate and its relation with the concepts about java persistence given in the Java EE 5 tutorial... could you clarify the role of Hibernate in the context of Entities and EJBs? Also, I want to know other approaches

问题 I'm writing a J2SE app (no enterprise container) that uses JPA for persistence. Here is my persistence.xml : <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="dbstats"> <!-- TODO: why is this needed? --> <class>dreambear.stats.data.GamePlayedEvent</class> <class>dreambear

问题 I am looking for ways to store data in a Windows Forms application in .NET. I want to make the input data of a system persistent, so when I close my program and open it again, the data is retrieved. Which ways of doing this exist besides creating a linked database? Examples are gladly appreciated. 回答1: There are dozens of different ways to store data. It completely depends on what data. Is it: Just a couple of configuration values? Use the built-in Settings library. Machine-wide configuration

问题 I want to read environment variables inside persistence.xml file. Idea is that i don't want my database details to be read from properties file as there is a change of getting properties file override.Instead i want to read details from environment variables. Is there any way to achieve this criteria. Iam using Spring 3 my standalone application will be deployed in unix machine. 回答1: You can update properties in a persistence unit by supplying a Map (see this). Conveniently, environment