@azimutt/connector-postgres

PostgreSQL connector

This library allows to connect to PostgreSQL, extract its schema and more...

It lists all schemas, tables, columns, relations and types and format them in a JSON Schema.

This library is made by Azimutt to allow people to explore their PostgreSQL database. It's accessible through the Desktop app (soon), the CLI or even the website using the gateway server.

Feel free to use it and even submit PR to improve it:

• improve PostgreSQL queries (look at getSchema function)

Publish

• update package.json version
• update lib versions (pnpm -w run update + manual)
• test with pnpm run dry-publish and check azimutt-connector-postgres-x.y.z.tgz content
• launch pnpm publish --no-git-checks --access public

View it on npm.

Dev

If you need to develop on multiple libs at the same time (ex: want to update a connector and try it through the CLI), depend on local libs but publish & revert before commit.

• Depend on a local lib: pnpm add <lib>, ex: pnpm add @azimutt/models
• "Publish" lib locally by building it: pnpm run build

Local Setup

You can use the PostgreSQL Official image:

docker run --name postgres_sample -p 5433:5432 -e POSTGRES_PASSWORD=postgres postgres:latest

Connect with host (localhost), port (5433), user (postgres) and pass (postgres) or using postgresql://postgres:postgres@localhost:5433/postgres, then add some tables and data:

CREATE TABLE users (
    id              BIGSERIAL PRIMARY KEY,
    name            VARCHAR(50)             NOT NULL,
    role            VARCHAR(10)             NOT NULL,
    email           VARCHAR(255)            NOT NULL,
    email_confirmed BOOLEAN   DEFAULT false NOT NULL,
    settings        JSONB,
    created_at      TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT users_lower_email_chk CHECK (email = LOWER(email)),
    CHECK (name <> email)
);
COMMENT ON TABLE users IS 'List all users';
COMMENT ON COLUMN users.name IS 'The user name';
CREATE UNIQUE INDEX users_email_uniq ON users (email);
CREATE INDEX users_role_idx ON users (role);
CREATE INDEX users_plan_idx ON users ((settings -> 'plan' ->> 'name'));
CREATE INDEX users_full_idx ON users (name, email, (settings -> 'plan' ->> 'name'), (settings ->> 'color'));

CREATE VIEW admins AS SELECT id, name, email FROM users WHERE role = 'admin';
COMMENT ON VIEW admins IS 'Only admins';

CREATE MATERIALIZED VIEW guests AS SELECT id, name, email FROM users WHERE role = 'guest';
COMMENT ON MATERIALIZED VIEW guests IS 'Only guests';


CREATE TABLE posts (
    id         BIGSERIAL PRIMARY KEY,
    title      VARCHAR(50) NOT NULL,
    content    TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    created_by INT         NOT NULL,
    CONSTRAINT posts_created_by_fk FOREIGN KEY (created_by) REFERENCES users (id)
);

CREATE TABLE post_authors (
    post_id INT,
    user_id INT,
    CONSTRAINT post_authors_pk PRIMARY KEY (post_id, user_id),
    CONSTRAINT post_authors_post_id_fk FOREIGN KEY (post_id) REFERENCES posts (id),
    CONSTRAINT post_authors_user_id_fk FOREIGN KEY (user_id) REFERENCES users (id)
);

CREATE TABLE post_author_details (
    detail_post_id INT,
    detail_user_id INT,
    role           VARCHAR(10) NOT NULL,
    CONSTRAINT post_author_details_pk PRIMARY KEY (detail_post_id, detail_user_id),
    CONSTRAINT post_author_details_post_user_fk FOREIGN KEY (detail_post_id, detail_user_id) REFERENCES post_authors (post_id, user_id)
);

CREATE TABLE ratings (
    user_id   INT         NOT NULL,
    item_kind VARCHAR(50) NOT NULL,
    item_id   INT         NOT NULL,
    rating    INT         NOT NULL CHECK ( 0 <= rating AND rating <= 5 ),
    review    VARCHAR(255),
    CONSTRAINT ratings_pk PRIMARY KEY (user_id, item_kind, item_id),
    CONSTRAINT ratings_user_id_fk FOREIGN KEY (user_id) REFERENCES users (id)
);


-- Insert data
INSERT INTO users (name, role, email, settings) VALUES ('Loïc', 'admin', '[e-mail]', '{"color": "red", "plan": {"id": 1, "name": "pro"}}');
INSERT INTO users (name, role, email, settings) VALUES ('Jean', 'guest', '[e-mail]', null);
INSERT INTO users (name, role, email, settings) VALUES ('Luc', 'guest', '[e-mail]', null);
INSERT INTO posts (title, content, created_by) VALUES ('PostgreSQL connector', null, 1);
INSERT INTO post_authors (post_id, user_id) VALUES (1, 1);
INSERT INTO post_authors (post_id, user_id) VALUES (1, 2);
INSERT INTO post_author_details (detail_post_id, detail_user_id, role) VALUES (1, 1, 'author');
INSERT INTO ratings (user_id, item_kind, item_id, rating) VALUES (3, 'posts', 1, 4);
INSERT INTO ratings (user_id, item_kind, item_id, rating) VALUES (3, 'users', 1, 5);
INSERT INTO ratings (user_id, item_kind, item_id, rating) VALUES (3, 'users', 3, 5);

Remove everything with:

DROP MATERIALIZED VIEW guests;
DROP VIEW admins;
DROP TABLE ratings;
DROP TABLE post_author_details;
DROP TABLE post_authors;
DROP TABLE posts;
DROP TABLE users;