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https://github.com/andywer/postguard
🐛 Statically validate Postgres SQL queries in JS / TS code and derive schemas.
https://github.com/andywer/postguard
babel database database-schema nodejs postgresql query-builder schema sql sql-query typescript validation
Last synced: 20 days ago
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🐛 Statically validate Postgres SQL queries in JS / TS code and derive schemas.
- Host: GitHub
- URL: https://github.com/andywer/postguard
- Owner: andywer
- License: gpl-3.0
- Created: 2018-12-18T05:15:32.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2023-02-28T05:50:03.000Z (over 1 year ago)
- Last Synced: 2024-05-02T06:16:41.837Z (7 months ago)
- Topics: babel, database, database-schema, nodejs, postgresql, query-builder, schema, sql, sql-query, typescript, validation
- Language: TypeScript
- Homepage:
- Size: 2.17 MB
- Stars: 165
- Watchers: 3
- Forks: 8
- Open Issues: 16
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
postguard
Validate SQL queries in JavaScript and TypeScript code against your schema at build time 🚀
Locates SQL template strings and schema definitions in your code. Evaluates the queries, matching them against your database schema. Supports type-checking via TypeScript, so you get **statically typed SQL queries validated against your database schema** 😱😱
Use with [squid](https://github.com/andywer/squid). It provides SQL tagged template strings, auto-escapes dynamic expressions to prevent SQL injections and comes with some syntactic sugar to write short, explicit SQL queries.
🦄 Validates SQL template strings in code
🚀 Checks SQL queries [syntax and semantics](#validations)
⚡️ Works statically, without additional runtime overhead
⚙️ Built on top of Babel & TypeScript
🛠 Uses `libpg_query`, the actual Postgres SQL parser
---
## Installation
```sh
npm install --save-dev postguard
# or using yarn:
yarn add --dev postguard
```
## CLI
Run the tool like this:
```sh
postguard src/models/*
```
We can use npm's [npx tool](https://blog.npmjs.org/post/162869356040/introducing-npx-an-npm-package-runner) to run the locally installed package:
```sh
npx postguard src/models/*
```
## Command line options
```
Usage
$ postguard ./path/to/source/*.ts
Options
--help Print this help
-w, --watch Watch files and re-evaluate on change
```
## Guide
- **[Usage](./docs/usage.md)** - Hands-on examples how to use the tool
- **[Validations](./docs/validations.md)** - List of validations that will be performed
## Motivation
Let's quickly compare the options you got when writing code that uses a relational database.
Our sample use case is updating project rows that are owned by a certain user.
### Plain SQL
Sample:
```js
const { rows } = await database.query(`
UPDATE projects SET
last_opened = NOW(),
open_count = open_count + 1
WHERE
projects.id IN (
SELECT project_id FROM project_members WHERE user_id = $1
)
RETURNING *
`,
[ userId ]
)
```
Pro:
- Efficient queries
- Explicit - No magic, full control
- Functional stateless data flow, atomic updates
Con:
- Very easy to make mistakes
- No way of telling if correct unless code is run
- Can be quite verbose
- Requires knowledge about SQL & your database
- No type safety
### ORMs (Sequelize, TypeORM, ...)
Sample:
```js
// (Model definitions not included)
const user = await User.findById(userId)
const projects = await user.getProjects()
const updatedProjects = await Promise.all(
projects.map(async project => {
project.last_opened = new Date(Date.now())
project.open_count++
return project.save()
})
)
```
Pro:
- Easy to get started
- Type-safety
- Less error-prone than writing raw SQL
- Requires no SQL knowledge
Con:
- Implicit - Actual database queries barely visible
- Usually leads to inefficient queries
- Update operations based on potentially stale local data
- Virtually limits you to a primitive subset of your database's features
### Query builder (Knex.js, Prisma, ...)
Sample:
```js
// (Model definitions not included)
const usersProjects = await prisma.user({ id: userId }).projects()
const updatedProjects = await Promise.all(
projects.map(project =>
prisma.updateProject({
data: {
last_opened: new Date(Date.now()),
open_count: project.open_count + 1
},
where: {
id: project.id
}
})
)
)
```
Pro:
- Explicit - Full control over queries
- Functional stateless data flow
- Type-safety
Con:
- Additional abstraction layer with its own API
- Atomic updates still hardly possible
- Requires knowledge about both, SQL & your database plus the query builder API
### SQL with squid & postguard 🚀
Sample:
```ts
// (Schema definition not included)
const { rows } = await database.query(sql`
UPDATE projects SET
last_opened = NOW(),
open_count = open_count + 1
WHERE
projects.id IN (
SELECT project_id FROM project_members WHERE user_id = ${userId}
)
RETURNING *
`)
```
Pro:
- Explicit - Full control, no implicit magic
- Fast due to absence of abstraction layers
- Functional stateless data flow, atomic updates
- Full query validation at build time
- Type-safety
Con:
- Requires knowledge about SQL & your database
## Debugging
Set the environment variable `DEBUG` to `postguard:*` to enable debug logging. You can also narrow debug logging down by setting `DEBUG` to `postguard:table` or `postguard:query`, for instance.
## Questions? Feedback?
Feedback is welcome, as always. Feel free to comment what's on your mind 👉 [here](https://github.com/andywer/postguard/issues/1).
## License
MIT