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Convenience tooling to perform database interactions from CI, bash scripts and automation processes.

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# ETL - SQL-First CLI, API & Web Development Framework

[![Go Report Card](https://goreportcard.com/badge/github.com/titpetric/etl)](https://goreportcard.com/report/github.com/titpetric/etl)
[![Testing coverage](https://img.shields.io/badge/coverage-54.2%25-yellowgreen)](https://raw.githubusercontent.com/titpetric/etl/main/docs/testing-coverage.md)
[![GoDoc](https://pkg.go.dev/badge/github.com/titpetric/etl.svg)](https://pkg.go.dev/github.com/titpetric/etl)

**ETL** started out as a CLI tool to interface databases with JSON from
the terminal. It became something more, with a server, where you can define
API endpoints using parametrized SQL queries in a yaml configuration.

Currently, it provides:

- A CLI for writing/reading from databases using JSON
- A server that uses a .yaml definition to provide APIs
- Web development capabilities with templating from API responses (SSR)
- CQRS support by composing definitions with `include`.

## Installation

```bash
go install github.com/titpetric/etl/cmd/etl@main
```

## Quick Navigation

- **[CLI Reference](./docs/cli.md)** – Command-line tool usage, database operations, and examples
- **[Configuration](./docs/config.md)** – Server configuration, endpoints, handlers, and options
- **[Server Development](./docs/server.md)** – API configuration, web development, and template rendering

## Overview

ETL supports these major use cases:

1. **CLI Database Interface** - Query and manipulate databases from shell scripts
2. **SQL-First API Development** - Expose database queries as json based REST/RPC API endpoints with zero boilerplate
3. **Web Development** - Responses can be templated, reusing existing APIs defined in the system as the data source
4. **CQRS Development** - Composable configuration allows trivial separation of read/write statements

## Supported Databases

- SQLite
- PostgreSQL
- MySQL

The ETL CLI aims to be database agnostic. It leans into `json` as a
portable data format, and implements compatibility drivers to talk to
each database, storing and returning JSON with a common API.

The SQL you define on your own is not portable, as it depends on the
database server in use. This allows you to use server specific syntax.

## Testing

Several test suites demonstrate core functionality:

- **[tests/git-tags](./tests/git-tags)** – CLI usage examples
- **[tests/petstore](./tests/petstore)** – SQL-as-API examples
- **[tests/users](./tests/users)** – CQRS and integrated testing

## Configuration

Set environment variables with your connection/storage details:

| Database    | Example DSN                                                         |
|-------------|---------------------------------------------------------------------|
| SQLite      | `export ETL_DB_DSN="sqlite://file:myapp.db"`                        |
| PostgreSQL  | `export ETL_DB_DSN="postgres://user:pass@localhost:5432/dbname"     |
| MySQL       | `export ETL_DB_DSN="mysql://user:pass@tcp(localhost:3306)/dbname"`  |

## Why ETL?

**Standard database clients** (`psql`, `mysql -e`) require mastering database-specific syntax and CLI arguments and flags.

**ETL provides:**

- Unified interface across SQLite, PostgreSQL, and MySQL
- First-class JSON support for input/output
- Simple insert/update operations via JSON or arguments
- Custom SQL query capability for complex operations
- Rapid API development without boilerplate
- Web application rendering alongside API servers

**Use with** `jq`, `yq`, or other standard tools for data transformation pipelines.

## License

[See LICENSE file](./LICENSE)

## References

- [go-bridget/mig](https://github.com/go-bridget/mig) – For database migrations
- [titpetric/vuego](https://github.com/titpetric/vuego) – Template engine
- [titpetric/platform](https://github.com/titpetric/platform) – HTTP server framework

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