An adapter enabling use of the schemer schema migration library with PostgreSQL.

Examples:

extern crate postgres;
extern crate schemer;
extern crate schemer_postgres;
extern crate uuid;

use std::collections::HashSet;

use postgres::Connection;
use postgres::transaction::Transaction;
use schemer::{Migration, Migrator};
use schemer_postgres::{PostgresAdapter, PostgresAdapterError, PostgresMigration};
use uuid::Uuid;

struct MyExampleMigration {}

impl Migration for MyExampleMigration {
    fn id(&self) -> Uuid {
        Uuid::parse_str("4885e8ab-dafa-4d76-a565-2dee8b04ef60").unwrap()
    }

    fn dependencies(&self) -> HashSet<Uuid> {
        HashSet::new()
    }

    fn description(&self) -> &'static str {
        "An example migration without dependencies."
    }
}

impl PostgresMigration for MyExampleMigration {
    fn up(&self, transaction: &Transaction) -> Result<(), PostgresAdapterError> {
        transaction.execute("CREATE TABLE my_example (id integer PRIMARY KEY);", &[])?;
        Ok(())
    }

    fn down(&self, transaction: &Transaction) -> Result<(), PostgresAdapterError> {
        transaction.execute("DROP TABLE my_example;", &[])?;
        Ok(())
    }
}

fn main() {
    let conn = Connection::connect(
        "postgresql://postgres@localhost/?search_path=pg_temp",
        postgres::TlsMode::None).unwrap();
    let adapter = PostgresAdapter::new(&conn, None);

    let mut migrator = Migrator::new(adapter);

    let migration = Box::new(MyExampleMigration {});
    migrator.register(migration);
    migrator.up(None);
}