Crate pg_embed[−][src]

Expand description

pg-embed

Run a Postgresql database locally on Linux, MacOS or Windows as part of another Rust application or test.

The currently supported async runtime for pg-embed is tokio.

Support for async-std and actix is planned and will be available soon.

Usage

Add pg-embed to your Cargo.toml

Library without sqlx migration support

[dependencies]
pg-embed = { version = "0.5", default-features = false, features = ["rt_tokio"] }

Library with sqlx migration support

[dependencies]
pg-embed = "0.5"

Examples


use pg_embed::postgres::{PgEmbed, PgSettings, PgAuthMethod};
use pg_embed::pg_fetch;
use pg_embed::pg_fetch::{PgFetchSettings, PG_V13};
use std::time::Duration;
use std::path::PathBuf;

/// Postgresql settings
let pg_settings = PgSettings{
// Where to store the postgresql database
database_dir: PathBuf::from("data/db"),
port: 5432,
user: "postgres".to_string(),
password: "password".to_string(),
// authentication method
auth_method: PgAuthMethod::Plain,
// If persistent is false clean up files and directories on drop, otherwise keep them
persistent: false,
// duration to wait before terminating process execution
// pg_ctl start/stop and initdb timeout
timeout: Duration::from_secs(15),
// If migration sql scripts need to be run, the directory containing those scripts can be
// specified here with `Some(PathBuf(path_to_dir)), otherwise `None` to run no migrations.
// To enable migrations view the **Usage** section for details
migration_dir: None,
};

/// Postgresql binaries download settings
let fetch_settings = PgFetchSettings{
version: PG_V13,
..Default::default()
};


/// async block only to show that these methods need to be executed in an async context
async {
     // Create a new instance
     let mut pg = PgEmbed::new(pg_settings, fetch_settings).await?;

     // Download, unpack, create password file and database cluster
     pg.setup().await;

     // start postgresql database
     pg.start_db().await;

     // create a new database
     // to enable migrations view the [Usage] section for details
     pg.create_database("database_name").await;

     // drop a database
     // to enable migrations view [Usage] for details
     pg.drop_database("database_name").await;

     // check database existence
     // to enable migrations view [Usage] for details
     pg.database_exists("database_name").await;

     // run migration sql scripts
     // to enable migrations view [Usage] for details
     pg.migrate("database_name").await;

     // stop postgresql database
     pg.stop_db().await;
};
// get the base postgresql uri
// `postgres://{username}:{password}@localhost:{port}`
let pg_uri: &str = &pg.db_uri;

// get a postgresql database uri
// `postgres://{username}:{password}@localhost:{port}/{specified_database_name}`
let pg_db_uri: String = pg.full_db_uri("database_name");

Info

The downloaded postgresql binaries are cached in the following directories:

On Linux:

$XDG_CACHE_HOME/pg-embed

or

$HOME/.cache/pg-embed
On Windows:

{FOLDERID_LocalAppData}/pg-embed
On MacOS:

$HOME/Library/Caches/pg-embed

pg-embed follows semantic versioning, so breaking changes should only happen upon major version bumps. The only exception to this rule is breaking changes that happen due to implementation that was deemed to be a bug, security concerns, or it can be reasonably proved to affect no code. For the full details, see CHANGELOG.md.