### Start and Rollback Transaction Example

Source: https://docs.geldata.com/reference/reference/edgeql/tx_start.md

Demonstrates how to start a transaction, execute a command within it, and then roll back the changes.

```edgeql
start transaction;
select 'Hello World!';
rollback;
```

--------------------------------

### Project Setup and Basic Gel Usage

Source: https://docs.geldata.com/reference/using/js.md

Set up a new project, install Gel, and demonstrate basic client creation and query execution with different cardinality options.

```bash
mkdir gel-js-example
cd gel-js-example
npm init -y
npm install gel
npm install --save-dev @gel/generate
npx gel project init --non-interactive
touch index.mjs
```

```javascript
import { createClient } from "gel";
import assert from "node:assert";

const client = createClient(); // get connection details automatically

// Query always returns an array of result, even for single object queries
const queryResult = await client.query("select 1");
assert.equal(queryResult, [1]);

// querySingle will throw an error if the query returns more than one row
const singleQueryResult = await client.querySingle("select 1");
assert.equal(singleQueryResult, 1);

// queryRequired will throw an error if the query returns no rows
const requiredQueryResult = await client.queryRequired("select 1");
assert.equal(requiredQueryResult, 1);

// queryRequiredSingle will throw an error if
// - the query returns more than one row
// - the query returns no rows
const requiredSingleQueryResult = await client.queryRequiredSingle("select 1");
assert.equal(requiredSingleQueryResult, 1);
```

--------------------------------

### Install Gel Client for Go

Source: https://docs.geldata.com/learn/clients.md

Get the Gel client library for Go using go get.

```bash
$ go get github.com/geldata/gel-go
```

--------------------------------

### Full Documentation Build and Development Server

Source: https://docs.geldata.com/resources/guides/contributing/documentation.md

Clone the website repository and follow installation instructions. Run 'yarn dev' to start a development server that builds all documentation. Note that auto-reload is not supported; manual browser reloads are required.

```bash
yarn dev
```

--------------------------------

### Install Dependencies for Flask-Gel API

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_flask.md

Clone the example repository, set up a Python virtual environment, and install the necessary Python packages including gel, flask, and httpx.

```bash
git clone git@github.com:geldata/gel-examples.git
cd gel-examples/flask-crud
python -m venv myvenv
source myvenv/bin/activate
pip install gel flask 'httpx[cli]'
```

--------------------------------

### Start Development Server

Source: https://docs.geldata.com/learn/tutorials/gel_drizzle_booknotes.md

Command to start the Next.js development server.

```bash
npm run dev
```

--------------------------------

### Install Gel Client and Generator with bun

Source: https://docs.geldata.com/reference/using/js.md

Install the database client and optional generator packages using bun.

```bash
bun add gel                 # database client
bun add --dev @gel/generate # generators
```

--------------------------------

### Install Gel Client and Generator with deno

Source: https://docs.geldata.com/reference/using/js.md

Install the database client and optional generator packages using deno.

```bash
deno add npm:gel                 # database client
den add --dev npm:@gel/generate # generators
```

--------------------------------

### Example: Generate default salt

Source: https://docs.geldata.com/reference/stdlib/pgcrypto.md

This example shows how to generate a salt using the default settings.

```edgeql-repl
db> select ext::pgcrypto::gen_salt();
{'$2a$06$5D2rBj3UY5/UYvPIUNILvu'}
```

--------------------------------

### Install Dependencies

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_fastapi.md

Set up a Python virtual environment and install the necessary dependencies including gel, fastapi, httpx, and uvicorn.

```bash
python -m venv myvenv
source myvenv/bin/activate
pip install gel fastapi 'httpx[cli]' uvicorn
```

--------------------------------

### Install Gel Server CLI

Source: https://docs.geldata.com/reference/using/cli/gel_server/gel_server_install.md

Use this command to install the Gel server. Options allow for interactive installation, installing nightly builds, or specifying a particular version.

```cli
gel server install [<options>]
```

--------------------------------

### Start Gel REPL

Source: https://docs.geldata.com/learn/quickstart/setup/fastapi.md

Start the Gel REPL from the project root to explore the empty database and run initial queries.

```sh
$ uvx gel
```

--------------------------------

### Initialize Gel Client and Query Database

Source: https://docs.geldata.com/learn/quickstart/connecting/nextjs

Initializes the Gel client and executes a simple static query to the database. This example shows the basic setup for connecting and querying without needing explicit connection details, as Gel handles this through project configuration and environment variables.

```typescript
import { createClient } from "gel";

const client = createClient();

async function main() {
  console.log(await client.query("select 'Hello from Gel!';"));
}

main().then(
  () => process.exit(0),
  (err) => {
    console.error(err);
    process.exit(1);
  }
);
```

--------------------------------

### Install Gel Client

Source: https://docs.geldata.com/resources/guides/tutorials/nextjs_pages_router.md

Install the Gel client library using npm. This is required for interacting with the database.

```bash
npm install gel
```

--------------------------------

### Install Gel Client

Source: https://docs.geldata.com/resources/guides/tutorials/trpc.md

Install the Gel client package using your preferred package manager.

```bash
pnpm add gel
# or yarn add gel
# or npm install gel
# or bun add gel
```

--------------------------------

### Install Gel Client and Generator with npm

Source: https://docs.geldata.com/reference/using/js.md

Install the database client and optional generator packages using npm.

```bash
npm install --save-prod gel          # database client
npm install --save-dev @gel/generate # generators
```

--------------------------------

### Install Gel Client and Generator with yarn

Source: https://docs.geldata.com/reference/using/js.md

Install the database client and optional generator packages using yarn.

```bash
yarn add gel                 # database client
yarn add --dev @gel/generate # generators
```

--------------------------------

### Clone Gel Examples Repository

Source: https://docs.geldata.com/resources/guides/tutorials/graphql_apis_with_strawberry.md

Clone the Gel examples repository and navigate to the strawberry-gql directory to begin.

```bash
git clone git@github.com:geldata/gel-examples.git
cd gel-examples/strawberry-gql
```

--------------------------------

### Install a Standalone Extension

Source: https://docs.geldata.com/reference/datamodel/extensions.md

Install standalone extensions like `postgis` using the `gel extension install` command. Ensure to restart your instance afterward.

```bash
$ gel extension install postgis
Found extension package: postgis version 3.4.3+6b82d77
00:00:03 [====================] 22.49 MiB/22.49 MiB
Extension 'postgis' installed successfully.
```

--------------------------------

### Install @gel/generate with bun

Source: https://docs.geldata.com/reference/using/js/generation.md

Install the @gel/generate package as a development dependency using bun.

```bash
bun add --dev @gel/generate
```

--------------------------------

### Install Gel Package

Source: https://docs.geldata.com/learn/tutorials/gel_drizzle_booknotes.md

Installs the Gel library for database access in your project.

```bash
npm i gel
```

--------------------------------

### GraphQL GET Request Example

Source: https://docs.geldata.com/reference/using/graphql.md

Example of sending a GraphQL query via a GET request with URL-encoded parameters for query, variables, and globals.

```bash
$ curl \
    -H application/x-www-form-urlencoded \
    -X GET http://localhost:10787/branch/main/graphql \
    -G \
    --data-urlencode 'query=query getMovie($title: String!) { Movie(filter: {title:{eq: $title}}) { id title }}' \
    --data-urlencode 'variables={ "title": "The Batman" }' \
    --data-urlencode 'globals={ "default::current_user": "04e52807-6835-4eaa-999b-952804ab40a5" }'
{"data": {...}}
```

--------------------------------

### Install Gel Client for Node.js

Source: https://docs.geldata.com/learn/clients.md

Install the Gel client library for Node.js using npm or yarn.

```bash
$ npm install gel    # npm
$ yarn add gel       # yarn
```

--------------------------------

### Install Gel Client and Generator with pnpm

Source: https://docs.geldata.com/reference/using/js.md

Install the database client and optional generator packages using pnpm.

```bash
pnpm add --save-prod gel          # database client
pnpm add --save-dev @gel/generate # generators
```

--------------------------------

### Create Gel Client in Go

Source: https://docs.geldata.com/reference/using/clients.md

Initialize a Gel client in Go. This example demonstrates setting up the client with options and performing a single query.

```go
package main

import (
    "context"

    "github.com/geldata/gel-go"
    "github.com/geldata/gel-go/gelcfg"
)

func main() {
    ctx := context.Background()
    client, err := gel.CreateClient(gelcfg.Options{})
    if err != nil {
        log.Fatal(err)
    }
    defer client.Close()

    var (
        answer int64
    )

    query := "select 42"
    err = client.QuerySingle(ctx, query, &answer)
}
```

--------------------------------

### GraphQL GET Request Example

Source: https://docs.geldata.com/reference/using/graphql.md

An example of how to send a GraphQL query using an HTTP GET request. Query parameters are used for passing the query and variables.

```APIDOC
## GraphQL GET Request Example

### Description
Sends a GraphQL query using an HTTP GET request with query parameters.

### Method
GET

### Endpoint
`http://<instance-hostname><instance-port>/branch/<branch-name>/graphql`

### Query Parameters
- **query** (string) - Required - The GraphQL query string.
- **variables** (string) - Optional - A JSON string containing variables for the query.
- **globals** (string) - Optional - A JSON string containing global variables (deprecated, use `variables.__globals__` instead).
- **operationName** (string) - Optional - The name of the operation to execute.

### Request Example
```bash
$ curl \
    -H application/x-www-form-urlencoded \
    -X GET http://localhost:10787/branch/main/graphql \
    -G \
    --data-urlencode 'query=query getMovie($title: String!) { Movie(filter: {title:{eq: $title}}) { id title }}' \
    --data-urlencode 'variables={ "title": "The Batman" }' \
    --data-urlencode 'globals={ "default::current_user": "04e52807-6835-4eaa-999b-952804ab40a5" }'
```

### Response
#### Success Response (200)
- **data** (object) - Contains the result of the GraphQL query.
```

--------------------------------

### Install @gel/generate with deno

Source: https://docs.geldata.com/reference/using/js/generation.md

Install the @gel/generate package as a development dependency using deno.

```bash
deno add --dev npm:@gel/generate
```

--------------------------------

### Configure Go Environment

Source: https://docs.geldata.com/learn/clients.md

Initialize a Go module and create a hello.go file.

```bash
$ go mod init example/quickstart
$ touch hello.go
```

--------------------------------

### Install Gel Client for Python

Source: https://docs.geldata.com/learn/clients.md

Install the Gel client library for Python using pip.

```bash
$ pip install gel
```

--------------------------------

### Clone and Set Up FastAPI Project

Source: https://docs.geldata.com/learn/quickstart/setup/fastapi.md

Clone the FastAPI starter template, navigate into the project directory, create and activate a virtual environment, install dependencies, and initialize the Gel project.

```sh
$ git clone \
    git@github.com:geldata/quickstart-fastapi.git \
    flashcards
$ cd flashcards
$ python -m venv venv
$ source venv/bin/activate # or venv\Scripts\activate on Windows
$ pip install -r requirements.txt
$ uvx gel project init
```

--------------------------------

### Fetch Movie by Name Request Example

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_flask.md

Example of an HTTP GET request to fetch a movie by its name using the 'filter_name' parameter.

```bash
$ httpx -m GET http://localhost:5000/movies \
        -p 'filter_name' 'The Avengers'
```

--------------------------------

### Test Getting All Actors with httpx

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_flask.md

Example of using the httpx command-line tool to send a GET request to the /actors endpoint to retrieve all actors.

```bash
$ httpx -m GET http://localhost:5000/actors
```

--------------------------------

### Get PostGIS SVN version

Source: https://docs.geldata.com/reference/stdlib/postgis.md

Returns the SVN version of the PostGIS installation.

```eql
ext::postgis::postgis_svn_version( ) -> optional std::str
```

--------------------------------

### Initialize a Local Project Interactively via CLI

Source: https://docs.geldata.com/cloud/cli.md

Run `gel project init` without the `--server-instance` option to be prompted interactively for the Gel Cloud instance name in the format `<org-name>/<instance-name>`.

```bash
$ gel project init
```

--------------------------------

### Example Version Check Request

Source: https://docs.geldata.com/reference/using/cli/network.md

This is an example of the HTTP GET request made by the CLI to check for version updates. The User-Agent header is minimal, and platform details are inferred from the URL.

```default
GET /archive/.jsonindexes/linux-x86_64.json HTTP/1.1
host: packages.geldata.com
content-length: 0
user-agent: gel
```

--------------------------------

### Navigate and Start Next.js Dev Server

Source: https://docs.geldata.com/resources/guides/tutorials/nextjs_pages_router.md

After scaffolding, navigate into the project directory and start the development server to view the application locally.

```bash
cd nextjs-blog
yarn dev
```

--------------------------------

### Get PostGIS scripts release version

Source: https://docs.geldata.com/reference/stdlib/postgis.md

Retrieves the release version of the installed PostGIS scripts.

```eql
ext::postgis::postgis_scripts_released( ) -> optional std::str
```

--------------------------------

### Test API with cURL (GET Books)

Source: https://docs.geldata.com/learn/tutorials/gel_drizzle_booknotes.md

Example cURL command to fetch all books from the API.

```bash
curl -X GET http://localhost:3000/api/books
```

--------------------------------

### Get Default TransactionOptions

Source: https://docs.geldata.com/reference/using/python/api/advanced.md

Retrieves the default TransactionOptions object. This is useful for understanding or starting with the standard configuration.

```python
TransactionOptions.defaults()
```

--------------------------------

### Query Initial Character Data

Source: https://docs.geldata.com/resources/guides/migrations/tips.md

Example of querying the Character data after the initial migration to verify the setup.

```edgeql-repl
db> select Character {name, class};
{
  default::Character {name: 'Alice', class: warrior},
  default::Character {name: 'Billie', class: scholar},
  default::Character {name: 'Cameron', class: rogue},
}
```

--------------------------------

### Initialize Gel Project

Source: https://docs.geldata.com/resources/guides/tutorials/chatgpt_bot.md

Initializes a new Gel project in the current directory. Prompts for instance name and version.

```bash
npx gel project init
No `gel.toml` found in `/<path>/<to>/<project>/docs-chatbot`
or above

Do you want to initialize a new project? [Y/n]
> Y

Specify the name of Gel instance to use with this project
[default: docs_chatbot]:
> docs_chatbot

Checking Gel versions...
Specify the version of Gel to use with this project
[default: 3.2]:
> 3.2
```

--------------------------------

### Call Standard Library Function (len)

Source: https://docs.geldata.com/reference/reference/edgeql/functions.md

Example of calling the standard library `len` function to get the length of a string.

```edgeql-repl
db> select len('foo');
{3}
```

--------------------------------

### Initialize Gel Project

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_flask.md

Initialize a new Gel project using the 'gel project init' command and follow the prompts to name the Gel instance and configure automatic startup.

```bash
gel project init
Initializing project...

Specify the name of Gel instance to use with this project
[default: flask_crud]:
> flask_crud

Do you want to start instance automatically on login? [y/n]
> y
Checking Gel versions...
```

--------------------------------

### Analyze Query Performance

Source: https://docs.geldata.com/reference/reference/edgeql/analyze.md

Example of using the analyze command in the EdgeQL REPL to get performance metrics for a select query.

```edgeql-repl
db> analyze select Hero {
...   name,
...   secret_identity,
...   villains: {
...     name,
...     nemesis: {
...       name
...     }
...   }
... };
──────────────────────────────────────── Query ────────────────────────────────────────
analyze select ➊  Hero {name, secret_identity, ➋  villains: {name, ➌  nemesis: {name}}};

──────────────────────── Coarse-grained Query Plan ────────────────────────
                  │ Time     Cost Loops Rows Width │ Relations
➊ root            │  0.0 69709.48   1.0  0.0    32 │ Hero
╰──➋ .villains    │  0.0     92.9   0.0  0.0    32 │ Villain, Hero.villains
╰──➌ .nemesis     │  0.0     8.18   0.0  0.0    32 │ Hero
```

--------------------------------

### Get Transaction Datetime

Source: https://docs.geldata.com/reference/stdlib/datetime.md

Obtain the start time of the current transaction using `datetime_of_transaction()`. This non-volatile function can be used in schema-defined computed properties.

```edgeql
std::datetime_of_transaction() -> datetime
```

--------------------------------

### Start a Gel Instance

Source: https://docs.geldata.com/reference/using/cli/gel_instance/gel_instance_start.md

Use this command to start a Gel instance. Specify the instance name. The `--foreground` option runs the instance in the foreground, which may require stopping a non-foreground instance first.

```cli
gel instance start [--foreground] <name>
```

--------------------------------

### Get Statement Datetime

Source: https://docs.geldata.com/reference/stdlib/datetime.md

Retrieve the start time of the current statement using `datetime_of_statement()`. This non-volatile function is suitable for use in schema-defined computed properties.

```edgeql
std::datetime_of_statement() -> datetime
```

--------------------------------

### Connect and Fetch with EdgeDB JavaScript Driver

Source: https://docs.geldata.com/resources/changelog/1_0_a2.md

Example of connecting to EdgeDB and fetching data using the new JavaScript driver. Ensure you have the driver installed and EdgeDB running.

```javascript
const edgedb = require("edgedb");

async function main() {
  const conn = await edgedb.connect({
    user: "edgedb",
    host: "127.0.0.1",
  });

  try {
    console.log(await conn.fetchOne("select 1 + 1"));
  } finally {
    await conn.close();
  }
}

main();
```

--------------------------------

### Initialize a New Gel Project

Source: https://docs.geldata.com/reference/using/projects.md

Run `gel project init` in your codebase's root directory to set up a new Gel project. It prompts for Gel version and instance name, then links your directory to the specified Gel database instance.

```bash
$ gel project init
No `gel.toml` found in this repo or above.
Do you want to initialize a new project? [Y/n]
> Y
Checking Gel versions...
Specify the version of Gel to use with this project [6.4]:
> # left blank for default
Specify the name of Gel instance to use with this project:
> my_instance
Initializing Gel instance...
Bootstrap complete. Server is up and running now.
Project initialialized.

```

--------------------------------

### Initialize Gel Client in Go

Source: https://docs.geldata.com/learn/clients.md

Create a Gel client instance in Go and execute a query. The client automatically connects to the project-linked instance.

```go
// hello.go
package main

import (
  "context"
  "fmt"
  "log"

  "github.com/geldata/gel-go"
)

func main() {
  ctx := context.Background()
  client, err := gel.CreateClient(ctx, gel.Options{})
  if err != nil {
    log.Fatal(err)
  }
  defer client.Close()

  var result float64
  err = client.
    QuerySingle(ctx, "select random();", &result)
  if err != nil {
    log.Fatal(err)
  }

  fmt.Println(result)
}
```

--------------------------------

### Filter Actors by Name with httpx

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_flask.md

Example of using the httpx command-line tool to send a GET request to the /actors endpoint with the 'filter_name' query parameter to retrieve a specific actor.

```bash
$ httpx -m GET http://localhost:5000/actors \
        -p filter_name "Robert Downey Jr."
```

--------------------------------

### String Manipulation Functions in EdgeQL

Source: https://docs.geldata.com/reference/edgeql/literals.md

Provides examples of common string manipulation operations in EdgeQL, including slicing, concatenation, getting the length, trimming whitespace, and splitting strings.

```edgeql
select 'hellothere'[5:10];
```

```edgeql
select 'hello' ++ 'there';
```

```edgeql
select len('hellothere');
```

```edgeql
select str_trim('  hello there  ');
```

```edgeql
select str_split('hello there', ' ');
```

--------------------------------

### Initialize Gel Project

Source: https://docs.geldata.com/resources/guides/tutorials/graphql_apis_with_strawberry.md

Initialize a new Gel project and configure a Gel instance named 'strawberry_crud', opting to start it automatically on login.

```bash
gel project init

Specify the name of Gel instance to use with this project
[default: strawberry_crud]:
> strawberry_crud

Do you want to start instance automatically on login? [y/n]
> y
Checking Gel versions...
```

--------------------------------

### Initialize a Local Project with a Gel Cloud Instance via CLI

Source: https://docs.geldata.com/cloud/cli.md

Use this command to initialize a local project and link it to a specific Gel Cloud instance. The instance name is provided using the `--server-instance` flag.

```bash
$ gel project init \
  --server-instance <org-name>/<instance-name>
```

--------------------------------

### Execute EdgeQL Query via cURL (GET)

Source: https://docs.geldata.com/reference/using/http.md

Example of sending an EdgeQL query using cURL with Bearer token authentication. Ensure you replace placeholders with your actual instance details and secret key.

```bash
$ curl -G https://<cloud-instance-host>:<cloud-instance-port>/branch/main/edgeql \
   -H "Authorization: Bearer <secret-key> \
   --data-urlencode "query=select Person {*};"
```

--------------------------------

### Find First Occurrence Index in Array

Source: https://docs.geldata.com/reference/stdlib/generic.md

Use `find()` to get the index of the first occurrence of an element in an array. An optional `from_pos` argument can specify the starting search position. Returns `-1` if not found.

```edgeql-repl
db> select find([2, 5, 7, 2, 100], 2);
{0}
```

```edgeql-repl
db> select find([2, 5, 7, 2, 100], 2, 1);
{3}
```

--------------------------------

### WebAuthn Client Setup and Event Handling

Source: https://docs.geldata.com/reference/auth/webauthn.md

Initializes the WebAuthnClient with necessary URLs and sets up event listeners for sign-up and sign-in buttons. Requires the email input to be present.

```javascript
import { WebAuthnClient } from "@gel/auth-core/webauthn";

const webAuthnClient = new WebAuthnClient({
  signupOptionsUrl: "http://localhost:3000/auth/webauthn/register/options",
  signupUrl: "http://localhost:3000/auth/webauthn/register",
  signinOptionsUrl: "http://localhost:3000/auth/webauthn/authenticate/options",
  signinUrl: "http://localhost:3000/auth/webauthn/authenticate",
  verifyUrl: "http://localhost:3000/auth/webauthn/verify",
});

document.addEventListener("DOMContentReady", () => {
  const signUpButton = document.querySelector("button#sign-up");
  const signInButton = document.querySelector("button#sign-in");
  const emailInput = document.querySelector("input#email");

  if (signUpButton) {
    signUpButton.addEventListener("click", async (event) => {
      event.preventDefault();
      const email = emailInput.value.trim();
      if (!email) {
        throw new Error("No email provided");
      }
      try {
        await webAuthnClient.signUp(email);
        window.location = "http://localhost:3000/signup-success";
      } catch (err) {
        console.error(err);
        window.location = "http://localhost:3000/signup-error";
      }
    });
  }

  if (signInButton) {
    signInButton.addEventListener("click", async (event) => {
      event.preventDefault();
      const email = emailInput.value.trim();
      if (!email) {
        throw new Error("No email provided");
      }
      try {
        await webAuthnClient.signIn(email);
        window.location = "http://localhost:3000";
      } catch (err) {
        console.error(err);
        window.location = "http://localhost:3000/signup-error";
      }
    })
  }
});
```

--------------------------------

### Initialize Gel Project

Source: https://docs.geldata.com/resources/guides/tutorials/trpc.md

Run this command to initialize a new Gel project and set up a default schema.

```bash
pnpm dlx gel project init # or `npx gel project init`
```

--------------------------------

### EdgeQL Transaction with Savepoint Rollback Example

Source: https://docs.geldata.com/reference/reference/edgeql/tx_sp_rollback.md

Demonstrates starting a transaction, declaring a savepoint, rolling back to that savepoint, and then committing the transaction. Note that 'rollback to savepoint' implicitly destroys savepoints created after the named one.

```edgeql
start transaction;
# ...
declare savepoint f1;
# ...
rollback to savepoint f1;
# ...
rollback;
```

--------------------------------

### Start Development Server

Source: https://docs.geldata.com/resources/guides/contributing/code.md

Starts the Gel development server using the `edb server` command. This server can then be connected to using the `gel` REPL or language bindings.

```bash
$ edb server
```

--------------------------------

### Find First Occurrence Index in String or Bytes

Source: https://docs.geldata.com/reference/stdlib/generic.md

Use `find()` to get the starting index of the first occurrence of a substring or byte sequence within a larger string or byte sequence. Returns `-1` if not found.

```edgeql-repl
db> select find('qwerty', 'we');
{1}
```

```edgeql-repl
db> select find(b'qwerty', b'42');
{-1}
```

--------------------------------

### JSON Credentials File Example

Source: https://docs.geldata.com/learn/clients.md

Use a JSON file to store connection details like host, port, user, password, branch, and TLS certificate data. This is useful for local development and Docker setups.

```json
{
  "host": "localhost",
  "port": 10700,
  "user": "testuser",
  "password": "testpassword",
  "branch": "main",
  "tls_cert_data": "-----BEGIN CERTIFICATE-----\nabcdef..."
}
```

--------------------------------

### View Gel Instance CLI Help

Source: https://docs.geldata.com/learn/instances.md

Access the help text for the `gel instance` command to find more options and details on managing instances.

```bash
$ gel instance --help
```

--------------------------------

### Initialize a Gel Project

Source: https://docs.geldata.com/learn/clients.md

Create a new directory and initialize a Gel project. This is the first step before configuring the environment and installing client libraries.

```bash
$ mydir myproject
$ cd myproject
$ gel project init
```

--------------------------------

### Initialize Gel Project

Source: https://docs.geldata.com/resources/guides/tutorials/nextjs_app_router.md

Run this command in your project's root directory to initialize a new Gel project. It will prompt for instance name and version, then set up the necessary configuration files.

```bash
$ npx gel project init
No `gel.toml` found in `~/nextjs-blog` or above
Do you want to initialize a new project? [Y/n]
> Y
Specify the name of Gel instance to use with this project [default:
nextjs_blog]:
> nextjs_blog
Checking Gel versions...
Specify the version of Gel to use with this project [default: x.x]:
> 
┌─────────────────────┬──────────────────────────────────────────────┐
│ Project directory   │ ~/nextjs-blog                                │
│ Project config      │ ~/nextjs-blog/gel.toml                       │
│ Schema dir (empty)  │ ~/nextjs-blog/dbschema                       │
│ Installation method │ portable package                             │
│ Start configuration │ manual                                       │
│ Version             │ x.x                                          │
│ Instance name       │ nextjs_blog                                  │
└─────────────────────┴──────────────────────────────────────────────┘
Initializing Gel instance...
Applying migrations...
Everything is up to date. Revision initial.
Project initialized.
```

--------------------------------

### Start Migration with Desired Schema

Source: https://docs.geldata.com/resources/guides/migrations/guide.md

Starts a migration by providing the target schema within a `start migration to {}` block.

```edgeql-repl
db> start migration to {
...   module default {
...     type User {
...       nam: str;
...     }
...   }
... };
```

--------------------------------

### Clone and Initialize Next.js Project

Source: https://docs.geldata.com/learn/quickstart/setup/nextjs

Clone the Gel Next.js starter template and install dependencies. Then, initialize your local Gel project.

```bash
git clone \
    git@github.com:geldata/quickstart-nextjs.git \
    flashcards
$ cd flashcards
$ npm install
$ npx gel project init
```

--------------------------------

### Install Geldata CLI with Powershell

Source: https://docs.geldata.com/learn/installation.md

Use this command to install the Geldata CLI globally using a Powershell script. Ensure you have Powershell installed.

```powershell
PS> irm https://www.geldata.com/ps1 | iex
```

--------------------------------

### Example: Set Module

Source: https://docs.geldata.com/reference/reference/edgeql/sess_set_alias.md

Demonstrates setting the default module for the current session.

```edgeql
set module foo;
```

--------------------------------

### Install Geldata CLI with Bash

Source: https://docs.geldata.com/learn/installation.md

Use this command to install the Geldata CLI globally using a bash script. Ensure you have curl installed.

```bash
$ curl https://www.geldata.com/sh --proto "=https" -sSf1 | sh
```

--------------------------------

### Create Project Directory

Source: https://docs.geldata.com/resources/guides/tutorials/rest_apis_with_fastapi.md

Create a new directory for your project and navigate into it.

```bash
mkdir fastapi-crud
cd fastapi-crud
```

--------------------------------

### Install EdgeDB 4 on Debian/Ubuntu

Source: https://docs.geldata.com/resources/changelog/4_x.md

Install EdgeDB v4 on Debian/Ubuntu systems after configuring the APT repository. This command updates package lists and installs the server.

```bash
$ sudo apt-get update && sudo apt-get install edgedb-4
```

--------------------------------

### Start Next.js Development Server

Source: https://docs.geldata.com/resources/guides/tutorials/nextjs_app_router.md

Navigate to your project directory and start the Next.js development server using npm, yarn, pnpm, or bun.

```bash
cd nextjs-blog
npm dev # or yarn dev or pnpm dev or bun run dev
```

--------------------------------

### Install Gel v7 on CentOS/RHEL

Source: https://docs.geldata.com/resources/changelog/7_x.md

Install Gel v7 on CentOS/RHEL systems using the yum package manager. This command directly installs the server package.

```bash
$ sudo yum install gel-7
```

--------------------------------

### Install Gel AI Package

Source: https://docs.geldata.com/reference/ai/python.md

Install the Gel AI package using pip. This command installs the AI extension along with the core Gel library.

```bash
$ pip install 'gel[ai]'
```

--------------------------------

### Configure Python Environment

Source: https://docs.geldata.com/learn/clients.md

Set up a Python virtual environment and create a main.py file.

```bash
$ python -m venv venv
$ source venv/bin/activate
$ touch main.py
```

--------------------------------

### Install Gel CLI on Linux or macOS

Source: https://docs.geldata.com/learn/cli.md

Installs the Gel CLI using a curl script. Ensure you have `curl` installed and that your shell supports `https` and TLS 1.2.

```bash
$ curl --proto '=https' --tlsv1.2 -sSf https://www.geldata.com/sh | sh
```

--------------------------------

### Install Drizzle ORM

Source: https://docs.geldata.com/learn/guides/drizzle

Install the Drizzle ORM package for your project.

```bash
npm install drizzle-orm
```

--------------------------------

### Initialize a New Gel Project

Source: https://docs.geldata.com/learn/projects.md

This interactive command initializes a new Gel project, prompts for instance and version details, and creates necessary configuration files.

```bash
$ gel project init
No `gel.toml` found in this repo or above.
Do you want to initialize a new project? [Y/n]
> Y
Specify the name of Gel instance to use with this project
[default: my_instance]:
> my_instance
Checking Gel versions...
Specify the version of Gel to use with this project [default: x.x]:
> # (left blank for default)
... 
Successfully installed x.x+cc4f3b5
Initializing Gel instance...
Applying migrations...
Everything is up to date. Revision initial
Project initialized.
To connect to my_instance, run `gel`
```

--------------------------------

### Initialize Next.js Project

Source: https://docs.geldata.com/learn/tutorials/gel_drizzle_booknotes.md

Creates a new Next.js application with specified configurations. Ensure Node.js and npm are installed.

```bash
npx create-next-app@latest book-notes-app

# When prompted, choose:
# ✔ Would you like to use TypeScript? Yes
# ✔ Would you like to use ESLint? Yes
# ✔ Would you like to use Tailwind CSS? Yes
# ✔ Would you like to use `src/` directory? Yes
# ✔ Would you like to use App Router? Yes
# ✔ Would you like to use Turbopack for `next dev`? No
# ✔ Would you like to customize the default import alias (@/*)? No

cd book-notes-app
```

--------------------------------

### Install Gel Generate Dev Dependency

Source: https://docs.geldata.com/reference/using/js/interfaces.md

Install `@gel/generate` as a dev dependency.

```bash
$ npm install @gel/generate --save-dev      # npm users
$ yarn add @gel/generate --dev              # yarn users
$ pnpm add --dev @gel/generate              # pnpm users
$ bun add --dev @gel/generate               # bun users
$ deno add --dev npm:@gel/generate          # deno users
```

--------------------------------

### Install Gel Package (CentOS/RHEL)

Source: https://docs.geldata.com/reference/running/deployment/bare_metal.md

Install the Gel package using YUM.

```bash
sudo yum install gel-6
```

--------------------------------

### Initialize a Cloud instance with a specific server version

Source: https://docs.geldata.com/reference/using/cli/gel_project/gel_project_init.md

This command initializes a project and specifies the latest release within the 6.x major version.

```bash
gel project init --server-version 6.1
```

--------------------------------

### Initialize Gel Client in Python

Source: https://docs.geldata.com/learn/clients.md

Create a Gel client instance in Python and execute a simple query. The client automatically connects to the project-linked instance.

```python
from gel import create_client

client = create_client()

result = client.query_single("select random()")
print(result)
```

--------------------------------

### std::bigint Encoding Example

Source: https://docs.geldata.com/resources/protocol/dataformats.md

Example encoding for the bigint value -15000.

```c
// ndigits
0x00 0x02

// weight
0x00 0x01

// sign
0x40 0x00

// reserved
0x00 0x00

// digits
0x00 0x01 0x13 0x88
```

--------------------------------

### Install Gel Client for .NET

Source: https://docs.geldata.com/learn/clients.md

Add the Gel.Net.Driver package to your .NET project.

```bash
$ dotnet add package Gel.Net.Driver
```

--------------------------------

### EdgeQL REPL Example

Source: https://docs.geldata.com/resources/guides/contributing/documentation.md

Use `edgeql-repl` for EdgeQL interactive examples, including prompts and optional output. The copy button excludes the prompt and output.

```default
.. code-block:: edgeql-repl

    db> insert Person { name := <str>$name };
    Parameter <str>$name: Pat
    {default::Person {id: e9009b00-8d4e-11ed-a556-c7b5bdd6cf7a}}
```

```edgeql-repl
db> insert Person { name := <str>$name };
Parameter <str>$name: Pat
{default::Person {id: e9009b00-8d4e-11ed-a556-c7b5bdd6cf7a}}
```

--------------------------------

### JavaScript Query Example

Source: https://docs.geldata.com/resources/guides/contributing/documentation.md

Example of executing a query using the JavaScript client.

```default
.. code-block:: javascript

    await client.query("select 'I ❤️ " ++ <str>$name ++ "!';", {
      name: "rock and roll"
    });
```

```javascript
await client.query("select 'I ❤️ " ++ <str>$name ++ "!';", {
  name: "rock and roll"
});
```

--------------------------------

### Gel Project Configuration Example

Source: https://docs.geldata.com/reference/using/projects.md

This TOML snippet shows a typical configuration for a Gel project, including server version, schema directory, and command hooks for project initialization and schema updates.

```toml
[instance]
server-version = "6.0"

[project]
schema-dir = "db/schema"

[hooks]
project.init.after = "setup_dsn.sh"
branch.switch.after = "setup_dsn.sh"
schema.update.after = "gel-orm sqlalchemy --mod compat --out compat"

[[watch]]
files = ["queries/*.edgeql"]
script = "npx @edgedb/generate queries"

```

--------------------------------

### Enable and Start Gel Systemd Unit

Source: https://docs.geldata.com/reference/running/deployment/bare_metal.md

Enable the Gel systemd service to start automatically on boot and start it immediately. This configures the server to listen on port 5656 with data stored in /var/lib/gel/6/data.

```bash
sudo systemctl enable --now gel-server-6
```

--------------------------------

### Install Gel Package

Source: https://docs.geldata.com/reference/using/js/interfaces.md

Install the `gel` package using your preferred package manager.

```bash
$ npm install gel       # npm users
$ yarn add gel          # yarn users
$ pnpm add gel          # pnpm users
$ bun add gel           # bun users
$ deno add npm:gel      # deno users
```

--------------------------------

### Initialize Project with Gel v7

Source: https://docs.geldata.com/resources/changelog/7_x.md

Specify version 7.0 when initializing a new project to use the latest features. Pre-release versions are not stable.

```bash
$ gel project init --server-version 7.0
```

--------------------------------

### Install @gel/generate with pnpm

Source: https://docs.geldata.com/reference/using/js/generation.md

Install the @gel/generate package as a development dependency using pnpm.

```bash
pnpm add --save-dev @gel/generate
```