PostgreSQL | PostgreSQL database adapter | Object-Relational Mapping library

by ZewoGraveyard Swift Version: 0.14.3 License: MIT

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kandi X-RAY | PostgreSQL Summary

PostgreSQL is a Swift library typically used in Utilities, Object-Relational Mapping, PostgresSQL applications. PostgreSQL has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

PostgreSQL adapter for Swift 3.0.

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Quality

Security

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Support

PostgreSQL has a low active ecosystem.

It has 93 star(s) with 18 fork(s). There are 17 watchers for this library.

It had no major release in the last 12 months.

PostgreSQL has no issues reported. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of PostgreSQL is 0.14.3

Quality

PostgreSQL has no bugs reported.

Security

PostgreSQL has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

PostgreSQL is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

PostgreSQL releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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PostgreSQL Key Features

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PostgreSQL Examples and Code Snippets

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Community Discussions

Trending Discussions on PostgreSQL

Aggregating all values not in the same group

Update field with Django ORM based on computed value

Syntax error at or near "DECLARE" in PostgreSQL stored procedure

PostgreSQL - Escape single quote in an column alias

npm run start won't find node_modules folder on different OS aside Windows

How to transfer data from old database to new modified database in django?

Django admin panel not showing related foreign key correctly - Postgresql

postgresql: update multiple values within one jsonb object

How to use database models in Python Flask?

How do I set the dialect for a SQLAlchemy connection pool with PostgreSQL in Django Python? Needed for pre-ping feature enabled

QUESTION

Aggregating all values not in the same group

Asked 2021-Jun-15 at 22:57

Is there a way in PostgreSQL to take this table:

ID country name values 1 USA John Smith {1,2,3} 2 USA Jane Smith {0,1,3} 3 USA Jane Doe {1,1,1} 4 USA John Doe {0,2,4}

and generate this table from it with the column agg_values:

ID country name values agg_values 1 USA John Smith {1,2,3} {0,1,3,1,1,1,0,2,4} 2 USA Jane Smith {0,1,3} {1,2,3,1,1,1,0,2,4} 3 USA Jane Doe {1,1,1} {1,2,3,0,1,3,0,2,4} 4 USA John Doe {0,2,4} {1,2,3,0,1,3,1,1,1}

Where each row aggregates all values except from the current row and its peers.
So if name = John Smith then agg_values = aggregate of all values where name not = John Smith. Is that possible?

...

ANSWER

Answered 2021-Jun-14 at 20:16

You can use a lateral join to a derived table that unnests all rows where the name is not equal and then aggregates that back into an array:

Source https://stackoverflow.com/questions/67975901

QUESTION

Update field with Django ORM based on computed value

Asked 2021-Jun-15 at 16:27

I have a basic model:

...

ANSWER

Answered 2021-Jun-15 at 16:27

You can use a CASE / WHEN construction. https://docs.djangoproject.com/en/3.2/ref/models/conditional-expressions/

Source https://stackoverflow.com/questions/67989906

QUESTION

Syntax error at or near "DECLARE" in PostgreSQL stored procedure

Asked 2021-Jun-15 at 16:20

I am creating a stored procedure in PostgreSQL 9.6 but I am getting syntax error. I am new to PostgreSQL. Are there more syntax errors in my code?

...

ANSWER

Answered 2021-Jun-15 at 15:25

Declare your function like this

Source https://stackoverflow.com/questions/67988969

QUESTION

PostgreSQL - Escape single quote in an column alias

Asked 2021-Jun-15 at 15:23

How to escape single quote in an column alias in PostgreSQL?

I tried several syntaxes without success:

...

ANSWER

Answered 2021-Jun-15 at 14:26

Use double quote for the identifier, and one single quote inside:

Source https://stackoverflow.com/questions/67988069

QUESTION

npm run start won't find node_modules folder on different OS aside Windows

Asked 2021-Jun-15 at 10:13

I made a node JS application using Hapi on Windows 10. After testing it locally, the script start would run without any problem. here is the start script inside the package.json

...

ANSWER

Answered 2021-Jun-15 at 10:13

You need to quote the *: nodemon -e "*" src/server.js.

Unlike Windows' cmd, Linux shells expand wildcards (as you can see in the command actually run, above the error). In Windows it's up to the program you are calling to expand wildcards. Since that is what you want in case of nodemon, it worked "by chance" on Windows without escaping the asterisk because it doesn't have any special meaning to cmd, but in Linux it will get expanded and that's not what you want.

Source https://stackoverflow.com/questions/67800328

QUESTION

How to transfer data from old database to new modified database in django?

Asked 2021-Jun-15 at 07:00

I have old django project and new django project. I created dump file from database of old django. And also I made changes in tables and created new tables.

Now I want to load that dump file to my new django app. I am facing errors when I firstly migrate then restore data or firstly restore then migrate.. When I do migration first, it says tables already exist.

When I do restore first , it says django.db.utils.ProgrammingError: relation "django_content_type" already exists I use migrate --fake error goes but new tables are not created in database.

I spent 3-4 days but could not succeed.

Please, help me if you can.

PS: my database is postgresql

...

ANSWER

Answered 2021-Jun-15 at 07:00

This is not straightforward and will need some manual interventions and it depends on what do you want to do in the future

If the tables that already exist in the database have a stable design and won't be changed or you can do the changes manually using SQL statements then set managed = False to the models' meta, this will make Django skip making migrations for those models
If you want to keep the power of migration in the new project for all models then this will more complex
1. Delete all your migrations
2. You need to make your models equivalent to your database, you can set managed=False for new models like Users
3. Run python manage.py makemigrations, this will create the structure of the initial database.
4. Fake running the migrations python manage.py migrate --fake
5. Dump the records of django_migrations table
6. Create a new empty migration (with --empty) and add the SQL statements of the django_migrations table to it using migrations.RunSQL()
7. now fake again so you skip that new migration.
8. Now you are ready to use migrations as usual.

When installing new database, you will just need to run python manage.py migrate

Source https://stackoverflow.com/questions/67980803

QUESTION

Django admin panel not showing related foreign key correctly - Postgresql

Asked 2021-Jun-15 at 06:31

I'm new to Django. I've defined 2 tables and have set a foreign key. So I want to link the column note from table Comment to the column id from table Note.

As I'm using PostgreSQL, when I check the psql shell, the name of the column note will be displayed as note_id.

So for using in template, if I use something like comment.note, it prints the "quick_note" of the note table, which I don't want that. I want to get the "id" of the related post to the current comment, not the quick_note of the related post. But if I use something like comments.note_id, it shows the id of the related post, which is what I expect to get.

Also in the admin panel, I see a field of note: that shows related quick_note not id. How can I fix it that admin panel show the related id? So here I want the id of related post to be shown in front of note:.

This is my model.py:

...

ANSWER

Answered 2021-Jun-15 at 06:31

This is the behavior of Django, the foreignKey field points to an object while field_id maps to primary key of the object, this important in case of assignment as if you try to save

Source https://stackoverflow.com/questions/67892444

QUESTION

postgresql: update multiple values within one jsonb object

Asked 2021-Jun-15 at 06:29

I have been facing a problem recently regarding JSONB data type in my Postgresql DB.

I have a rather complex structure of my column (let's say the table is called RATING and the column name FOOD_VALUE - making it up) which goes, for example, as follows:

...

ANSWER

Answered 2021-Jun-15 at 06:29

create type t_json_val as (path text[], val jsonb);

create or replace function jsonb_mset(a jsonb, variadic b t_json_val[])
    returns jsonb
    immutable
    language plpgsql
as $$
-- Set multiple jsonb values at once
declare
    bb t_json_val;
begin
    foreach bb in array b loop
        a := jsonb_set(a, bb.path, bb.val);
    end loop;
    return a;
end $$;

Source https://stackoverflow.com/questions/67980255

QUESTION

How to use database models in Python Flask?

Asked 2021-Jun-15 at 02:32

I'm trying to learn Flask and use postgresql with it. I'm following this tutorial https://realpython.com/flask-by-example-part-2-postgres-sqlalchemy-and-alembic/, but I keep getting error.

...

ANSWER

Answered 2021-Jun-15 at 02:32

I made a new file database.py and defined db there.

database.py

Source https://stackoverflow.com/questions/67976688

QUESTION

How do I set the dialect for a SQLAlchemy connection pool with PostgreSQL in Django Python? Needed for pre-ping feature enabled

Asked 2021-Jun-15 at 02:20

What I'm trying to achieve

I need to activate the pre-ping feature for as SQLAlchemy db pool in Django Python.

Error

When I set the pre_ping property to True, I get the following error which says I need to pass a dialect to the connection pool when using the pre-ping feature:

...

ANSWER

Answered 2021-Mar-18 at 12:21

The QueuePool constructor passes all keyword arguments to the Pool constructor. This constructor supports the dialect argument. So you should be able to add a dialect to your QueuePool call:

Source https://stackoverflow.com/questions/66689035

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