orm | Kohana ORM | Object-Relational Mapping library
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QUESTION
I have a basic model:
...ANSWER
Answered 2021-Jun-15 at 16:27You can use a CASE / WHEN
construction.
https://docs.djangoproject.com/en/3.2/ref/models/conditional-expressions/
QUESTION
I have two tables, one for products and one for suppliers, I did a query that returns this:
...ANSWER
Answered 2021-Jun-15 at 16:08You can achieve this using annotate()
:
QUESTION
I'm trying to docerize my NodeJS API together with a MySQL image. Before the initial run, I want to run Sequelize migrations and seeds to have the tables up and ready to be served.
Here's my docker-compose.yaml
:
ANSWER
Answered 2021-Jun-15 at 15:38I solved my issue by using Docker Compose Wait. Essentially, it adds a wait loop that samples the DB container, and only when it's up, runs migrations and seeds the DB.
My next problem was: those seeds ran every time the container was run - I solved that by instead running a script that runs the seeds, and touch
s a semaphore file. If the file exists already, it skips the seeds.
QUESTION
I am trying to use JOOQ code generation from JPA Entity. I have already created a dedicated maven module where the code will be generated which has dependency on a module containing all entities as well code generation plugin with of jooq.
To add more clarify on project structure, here are the modules:(The names are made up but the structure reflects the current project i am working on)
...ANSWER
Answered 2021-Jun-02 at 07:53I'm assuming you have missing dependencies on your code generation class path. Once you update your question, I'll update my answer.
Regarding jOOQ code generation support for@TypeDef
etc.
jOOQ won't support your generated composite types in generated code out of the box, you'll still have to add forced type configurations for that, possibly embeddable type configurations:
- https://www.jooq.org/doc/latest/manual/code-generation/codegen-advanced/codegen-config-database/codegen-database-forced-types/
- https://www.jooq.org/doc/latest/manual/code-generation/codegen-embeddable-types/
Note that the JPADatabase
offers a quick win by integrating with simple JPA defined schemas very quickly. It has its caveats. For best results, I recommend going DDL first (and generate both jOOQ code and JPA model from that), because it will be much easier to put your schema change management under version control, e.g. via Flyway or Liquibase.
QUESTION
I am connecting to a PostgreSQL database with python using os.Popen(cmd). How can I an write the SQL statement without using an ORM?
...ANSWER
Answered 2021-May-14 at 19:10Use psql
to issue your statements to the database via the pipe.
QUESTION
I'm generating POJO from Derby 10.14.2.0 database in NetBeans IDE 11.3, Hibernate ORM 5.4.31.
It does not generate any relationship-mappings
in hbm.xml
or in entity classes like many-to-one/one-to-one
).
I used Derby sample project for mcve.
I've used two tables from Derby sample database.
Product and PurchaseOrder
Product table is referenced in PurchaseOrder.
Table PurchaseOrder
has FOREIGN_KEY_PRODUCT_ID.
can see in image below.
hibernate.cfg
...ANSWER
Answered 2021-Jun-13 at 10:11You were close to solving it. The short answer is: just add this line to your hibernate.cfg.xml
config file (add empty catalog):
QUESTION
Profile.py
...ANSWER
Answered 2021-Jun-13 at 09:25You can filter the queryset with:
QUESTION
ANSWER
Answered 2021-Jun-13 at 03:15I think you might be causing yourself angst because of how you are handling the relationships.
Considering StateWithFacilities
You appear to be saying get the school who's id is equal to the schoolId column in the state.
While the realtionship should be from a column in the School that stores the appropriate StateId.
You appear to be using the reverse.
Example
Perhaps consider this example based upon what you appear to be wanting to do: (States, Schools and Locations have been given a name column to make the output easier to understand)-
State class (Entity and therefore Table) which is top of the hierarchy.
QUESTION
So
Console:
...ANSWER
Answered 2021-Apr-22 at 20:32I have had the same issue. This is what I did:
- I deleted the
migrations
folder as well as thedist
folder - I ran
npx mikro-orm migration:create --initial
After that, I restarted yarn watch
and yarn dev
and it worked for me.
Notice the --initial
flag. I would recommend to check the official documentation. The migrations table is used to keep track of already executed migrations. When you only run npx mikro-orm migration:create
, the table will not be created and therefore MikroORM is unable to check if the migration for the Post entity has already been performed (which includes creating the respective table on the database).
Ben does not use the --initial
flag in his tutorial, he might have already ran it prior to the tutorial.
QUESTION
I'm trying to annotate my data with their count in a case-insensitive manner. I found this similar question: django-orm case-insensitive order by and tried this:
...ANSWER
Answered 2021-Jun-12 at 14:56Try annotating you data using Lower
before Count
:
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