i have just started working on an application in PHP. I have configured the Postgres add on in my application on Heroku. But i am still not sure how to start working on the DATABASE. what i mean is that there is a thing called DATACLIP on the POSTGRES DB window on Heroku and when i try to create a table there, it gives me some weird errors.
But no matter what query i write there, it always gives me some error. So, i am not sure whether i can create the Tables and insert my data from DATACLIP or not. and If not, from where can i do this?
Dataclips are only useful for read-only queries. Think gist for SQL and data.
To create data on your database, you can:
Use database migrations that run within the heroku platform itself
Connect to your database using the provided credentials from anywhere (you must use SSL). To get credentials, either run heroku pg:credentials <DATABASE_COLOR> --app <YOUR_APP>, or go to your database in http://postgres.heroku.com. You should be able to use pg_admin or any other postgres front end to connect and create tables.
You can connect directly using the heroku toolbelt (and assuming you have a proper psql installation in your dev box) with heroku pg:psql --app <YOUR_APP>. From there just use SQL to create your data (CREATE TABLE, etc)
Related
For security reasons i have a heroku project that should access a heroku postgresql database but user can only access some tables.
How can i do this on heroku postgresql?
The only way i can think of doing this is:
creating a web project with a postgresql dev addon. this will create a new db in a HEROKU_COLOR_X url;
creating another web project with another postgresql dev addon multiple times so that this HEROKU_COLOR_* is same as previous HEROKU_COLOR_X;
login in HEROKU_COLOR_X with user_2 (admin) create some tables as user_2 and grant access to user_1 for some tables only.
this will result in same db host (HEROKU_COLOR_X) and 2 user/pass (user_1 for web project access and user_2 for db full access).
.. but is there any better solution?
best,
I'm not sure about your theory but unfortunately, the Heroku Postgres docs state:
You cannot create or modify databases and roles on Heroku Postgres.
The SQL below is for reference only.
I'd love it if this restriction could be changed or worked around as granular permissions are a security essential.
gerryster's answer is no longer accurate as Heroku have now released support for multiple roles https://devcenter.heroku.com/articles/heroku-postgresql-credentials This should cover the OP's use case of restricting access to certain tables.
I've a simple Sinatra application which I've developed using SQLite. The database is a simple two-column table: an ID and a string entry.
I would like to deploy this app to Heroku. What's the least painful way to convert an SQLite database to PostgreSQL, understanding that PostgreSQL is required to deploy to Heroku.
For simple use cases heroku db:push will push your local sqlite database into your Heroku Postgres database.
It's worth considering then switching to using Postgres locally and then use heroku db:pull to bring the database back from Heroku to your new local postgres instance.
I'll caveat to say that whilst heroku db:pull works for SIMPLE databases once you start using more complex Postgres datatypes then you need to use something like heroku pg:transger which is Postgres > Postgres only.
Use the taps gem, as shown in this Railscast.
First you'll want to install Postgres on your local machine so you can make changes and easily deploy to heroku. Second you'll want to migrate from SQLite to Postgres. I just did the migration for my own Rails app following Heroku's instructions and it took less 5 minutes. Seems simple enough.
The instructions to migrate are here (even has instructions on installing Postgres locally). Then you can follow the Heroku getting started guide for the rest.
So when I go into "heroku pg:psql" and type \l I get this:
What's the deal with that?
On dev and basic plans, your postgresql database is shared with others on the server.
Therefore, you are not the only one on this server, there are other users.
These databases you're seeing are the other users' databases.
You can't access them. But you can know they are here.
I was making a web app to deploy using Heroku.com when I realized that the only database type they support is PostgreSQL. Up until now, my app (powered by the Ruby gem Sinatra) accessed the database via the .Sqlite method for the Sequel gem.
Here's my Ruby script from when I used Sequel to access the .db file via SQLite:
DB = Sequel.sqlite('mydatabase.db')
DB.create_table :mytable do
primary_key :id
String :column_name
end
I installed PostgreSQL after learning Heroku used only that. Here's the script via postgres (my username is literally 'postgress', though I obviously won't reveal my password in this question):
DB = Sequel.postgres('mydatabase.db',:user=>'postgres',:password=>'my_password_here',:host=>'localhost',:port=>5432,:max_connections=>10)
DB.create_table :mytable do
primary_key :id
String :column_name
end
However, when I run this code, I get the following error:
C:/Ruby193/lib/ruby/gems/1.9.1/gems/sequel-3.38.0/lib/sequel/adapters/postgres.rb:208:in 'initialize': PG::Error: FATAL: database "mydatabase.db" does not exist (Sequel::DatabaseConnectionError)
I've tried searching Google, StackOverflow, Sequel documents, and the Heroku help documents for any help, but I've found no fix to this problem.
Does anyone know what I am doing wrong?
The database mydatabase.db doesn't exist, as per the error message from Pg. Likely reasons:
You probably meant mydatabase without the SQLite-specific .db filename suffix
It's possible you created the db with different case, eg "Mydatabase.db";
You might be connecting to a different Pg server than you think you are
You never created the database. Unlke SQLite's default behaviour, Pg doesn't create databases when you try to connect to a database that doesn't exist yet.
If in doubt, connect to Pg with psql and run \l to list databases, or connect via PgAdmin-III.
The PostgreSQL documentation and tutorial are highly recommended, too. They're well written and will teach you a lot about SQL in general as well as Pg in particular.
BTW, the postgres user is a superuser. You should not be using it for your application; it's like running your server as root, ie a really bad idea. Create a new PostgreSQL user without superuser, createdb or createuser rights and use that for your application. You can either CREATE DATABASE somedb WITH OWNER myappuser - or preferably, create the database owned by a different user to your webapp user and then expicitly GRANT the webapp user the minimum required permissions. See user management and GRANT.
On heroku all you need to do is tell Sequel to connect to the content of the DATABASE_URL environment variable (which is a properly formed url that Sequel understands):
DB = Sequel.connect(ENV['DATABASE_URL'])
I'm developing an application and hosting it on Heroku. For now, I want to use the free shared database solution.
My problem is that I can't access the database.
$ heroku pg:psql
! Cannot ingress to a shared database
I've read elsewhere that I can't connect to shared databases via psql.
I can't seem to find any information on that on Heroku's Dev Center, so this leaves me with the question - how can I edit or change or do anything with my database?
If you're happy to use a beta addon then there is the Heroku Shared PostgreSQL 9.1 addon (https://addons.heroku.com/heroku-shared-postgresql) which will permit you to ingress to your database.
However, any changes to your database are usually best done with scripted migrations (in the Ruby on Rails world) rather than connecting to your database to make changes.
If you're more familiar with mySQL then there are a number of mySQL addons which permit direct access also with normal mySQL tools.