ood_persistence 0.3.1

Asynchronous and synchronous interfaces and persistence implementations for your OOD architecture
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use ood_persistence::r2d2_postgres::{postgres, NoTlsManager};
pub use ood_persistence::r2d2_postgres::{
    NoTlsConnection as PostgresConnection, NoTlsPersistence as PostgresPersistence,
    NoTlsPool as PostgresPool,
};
pub use ood_persistence::{
    error::Result as QueryResult,
    syn::{ConnectionClient, PersistencePool, TransactionClient},
};

const DATABASE_URL: &str = "postgres://postgres:test@localhost:5577/x";

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // create pool to our database
    let pool = create_postgres_pool();
    // initialize persistence
    let persistence = ood_persistence::r2d2_postgres::new(&pool);
    // get connection to database
    let mut conn = persistence.get_connection()?;
    // we can query something
    let res: i32 = conn.inner().query_one("select 1", &[])?.get(0);
    assert_eq!(res, 1);

    // and we can upgrade connection to transaction
    let mut trx = conn.start_transaction()?;
    // we can query or execute something in transaction
    let res: i32 = trx.inner().query_one("select 2", &[])?.get(0);
    assert_eq!(res, 2);
    // now we close transaction
    trx.rollback()?;
    // or trx.commit()?;

    // and we can use connection again as well
    let res: i32 = conn.inner().query_one("select 3", &[])?.get(0);
    assert_eq!(res, 3);

    Ok(())
}

pub fn create_postgres_pool() -> PostgresPool {
    let db_conn_config = DATABASE_URL
        .parse()
        .expect("Failed to convert database url to database config");

    let manager = NoTlsManager::new(db_conn_config, postgres::NoTls);
    PostgresPool::builder()
        .build(manager)
        .expect("Failed to create database pool")
}