Recent questions tagged orm

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I think this is a common pattern, but I can't find the elegant CakePHP way of doing it. The idea is to ... some query ideas, to no avail. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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561 views

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orm - Should JPA entities and DDD entities be the same classes?

There are classes that are entities according to DDD, and there are classes that have @javax.persistence.Entity ... as understood in DDD. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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687 views

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orm - Filtering only on Annotations in Django

Taking the example from: http://docs.djangoproject.com/en/dev/topics/db/aggregation/#filter-and-exclude Publisher. ... having a num_books=0? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

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orm - Unknown Entity namespace alias in symfony2

Hey I have two bundles in my symfony2 project. one is Bundle and the other one is PatentBundle. My app ... Internal Server Error - ORMException See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

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orm - Grails domain class: unique constraint for multiple columns

Suppose a simple Grails domain class: class Account { String countryId; String userName; String password; ... the constraints definition? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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933 views

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orm - In Doctrine 2 can the Fetch Mode (Eager/Lazy etc.) be changed at runtime?

I have entities which I would like to eagerly load , and on other ocassions lazy (or even extra lazy) ... it being an unimplemented feature)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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orm - Sequelize - subquery in where clause

I'm using Sequelize in my Express app. I need to generate a query that has a subquery in the WHERE clause. ... " way. Thanks for the feedback! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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655 views

1 answer

orm - How to limit columns returned by Django query?

That seems simple enough, but all Django Queries seems to be 'SELECT *' How do I build a query returning only a subset of fields ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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471 views

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orm - Higher level database layer for Android?

Are there any good database abstraction layers/object relational mappers/ActiveRecord implementations/whatever they are called ... (SQLite). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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458 views

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orm - django difference between - one to one, many to one and many to many

So, this is my first time learning computer language. And I chose python and django. Now, I got many of the ... I really need to know. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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753 views

1 answer

orm - Making queries using F() and timedelta at django

I have the following model: class Process(models.Model): title = models.Charfield(max_length=255) date_up = ... .db.models.query.QuerySet. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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459 views

1 answer

orm - Ordering results by computed value in Hibernate

I have a table Player with columns id, name, wins, games_played. I mapped it to a class Player. I want to ... ratio. Thanks for the answer Palo See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

1 answer

orm - Fluent NHibernate HasManyToMany() Mapping

I am having a problem in Fluent NHibernate example utilizing the Many-to-Many relationships. I tried to find out ... way, so any ideas ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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514 views

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orm - How do I map a composite primary key in Entity Framework 4 code first?

I'm getting to grips with EF4 code first, and liking it so far. But I'm having trouble mapping an ... SubscriptionUser'. What am I missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

1 answer

orm - How to configure JPA 2.0 with Hibernate 3.5.2 to use EHCache as a Level 2 cache and query cache?

I found some instructions how to configure pure hibernate to use EHCache. But I can't find any instructions ... Cache to configure the entity? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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510 views

1 answer

orm - Are SQL injection attacks possible in JPA?

I'm building a Java Web Application using Java EE 6 and JSF-2.0, using the persistence API for all ... injection attacks possible in this case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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668 views

1 answer

orm - How to use dynamic SQL query in MyBatis with annotation(how to use selectProvider)?

I am trying to avoid having an additional xml to define the mapper in mybatis3. Annotation fits right in. I am ... the code? Thanks in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

1 answer

orm - Laravel Eloquent Filter By Column of Relationship

Using the Eloquent ORM I have my models set up like so: Post belongsToMany Category Post.php public function ... anyone show me the way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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615 views

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orm - How do I query for only superclass entities in a jpql query?

I have the following entities: @Entity @Inheritance(strategy=InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="orderType" ... . thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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584 views

1 answer

orm - Hibernate hbm2ddl.auto, possible values, and what they do

I am looking at the Hibernate hbm2ddl.auto configuration property and its possible values: validate update ... the official documentation. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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820 views

1 answer

orm - Doctrine 2 ArrayCollection filter method

Can I filter out results from an arrayCollection in Doctrine 2 while using lazy loading? For example, // ... filter method is actually used. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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609 views

1 answer

orm - Memory leaks Symfony2 Doctrine2 / exceed memory limit

I have a lot of trouble with the combination of symfony2 and doctrine2. I have to deal with huge datasets (around ... may help some rookie.. cya See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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352 views

1 answer

orm - How to use JPA2's @Cacheable instead of Hibernate's @Cache

Typically , I use Hibernate's @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) to cache an @Entity class , and ... (clazz, id); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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619 views

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orm - Dapper.Rainbow VS Dapper.Contrib

Can someone please explain the difference between Dapper.Rainbow vs. Dapper.Contrib? I mean when do you use ... you use Dapper.Rainbow? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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657 views

1 answer

orm - Why does django's prefetch_related() only work with all() and not filter()?

suppose I have this model: class PhotoAlbum(models.Model): title = models.CharField(max_length=128) author = models. ... supposed to do that... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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548 views

1 answer

orm - Hibernate - why use many-to-one to represent a one-to-one?

I've seen people use many-to-one mappings to represent one-to-one relationships. I've also read this in a ... option to many-to-one? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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726 views

1 answer

orm - Unique fields that allow nulls in Django

I have model Foo which has field bar. The bar field should be unique, but allow nulls in it, ... more elegant solution. Any recommendations? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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