persistence

问题 I'm trying to save a simple object in the database, but it's giving me problems. This is my object class: @Entity @Table(name="lines") public class Line extends GenericModel{ @Id @Column(name="line_id") private int id; @Column(name="line_text") private String text; @Column(name="line_postid") private int postid; @Column(name="line_position") private int position; } And this is what I have in my controller: Line l = new Line(); l.setPosition(0); l.setPostid(4); l.setText("geen"); l.save(); I'm

问题 I am just trying to map a boolean value with Mybatis, but I am having a problem. Firstly, I'll show you the parts involved: XML File: <resultMap id="destinationTypeMap" type="DestinationTypeDTO"> <result property="destinationTypeId" column="education_destination_type_id" javaType="java.lang.Long" jdbcType="NUMERIC"/> <result property="description" column="description" javaType="java.lang.String" jdbcType="VARCHAR"/> <result property="available" column="is_available" javaType="boolean"

问题 I want a hash function which is fast, collision resistant and can give unique output. The primary requirement is - it should be persist-able i.e It's progress(hashing progress) could be saved on a file and then later resumed. You can also provide your own implementation with Python. Implementations in "other languages" is/are also accepted if it is possible to use that with Python without getting hands dirty going internal. Thanks in advance :) 回答1: Because of the pigeonhole principle no hash

问题 I was wondering if these is some kind of technique so persist sensitive data out of a web app. I know that you should never store sensitive data in the local storage or cookies. When logging in a website a browser usually asks if it should persist you username and password. Where is it stored? How secure is it? And the most important question, can you access it using javascript / browser built-in functions? My Scenario: I generate an rsa key pair once (I know random of javascript isn't that

问题 Following recommendations given to me in this thread I am making my DAO accessors @Singleton, @Startup, @LocalBean My question is on the good way to implement the entityManager that is supposed to execute the various queries. Knowing that there are several Dao's, but they shall all point to the same entityManager (also created from a single entityManagerFactory), what's the best practice ? This is so far my implementation, but I have a feeling that it is reeeeealy bad :) Dao's @Singleton

问题 I have three classes: PlanItem Task SubTask It has the following hierachy: public abstract class PlanItem {...} public class Task extends PlanItem { ... private Set<SubTask> subTasks; ... } public class SubTask {...} I am using hibernate to generate three tables: "PlanItem", "Task" and "SubTask". @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) public abstract class PlanItem { @Id private String id; } @Entity @SecondaryTable( name = "Task" ) public class Task extends PlanItem {

问题 I'm trying to get the persistent Jquery Mobile navbar footer working. I would like it to be drawn dynamically with javascript (it's for a PhoneGap application) rather than using PHP for templating the footer. The following is adapted from: http://the-jquerymobile-tutorial.org/jquery-mobile-tutorial-CH21.php however, the jquery styling isn't being applied to pages 2 and 3. It's as if $("#navbar").navbar() isn't being called for these pages or is being called too early. Can anyone help me out

问题 I am stuck with geting a persisted object by its id. I am getting an error: com.google.appengine.api.datastore.EntityNotFoundException: No entity was found matching the key: CNG("T78") I persist the object as below to the data store: Key cngKey = KeyFactory.createKey("CNG", jsonCNG.cNGID); Entity cngEntity = new Entity("CNG", cngKey); cngEntity.setProperty("cng_name", jsonCNG.cNGName); cngEntity.setProperty("cng_type", jsonCNG.cNGType); cngEntity.setProperty("cng_content", cng); Here cng is a

问题 I'm feeling really stupid having to ask this. But I've been looking at my code for 4 hours and can't figure it out. I have rebuild my database several times and can't get it to work. One of my tables isn't being created for some reason. I have 4 tables game, developer, gameimage and user. User isn't being created but the other are being created perfectly and working. I'm sure it's a stupid mistake but I just don't see it. If someone could just tell me why this might be happening that would be

问题 I am trying to get data from my persistencejs(this is a library!) database in javascript. I am getting the values and pushing them in the array, I'm doing this in a forEach loop. In the loop the array is being filled with values, I have confirmed this using alerts. But when I look at the array outside of the loop, it's empty. Why is this? Here's the code (I've tried putting the variable inside the function, and tried changing it to this.newDataArray as well.): var newDataArray = new Array();