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use std::str::FromStr;
use native_tls::TlsConnector;
use postgres_client::{Client, Config};
use postgres_native_tls::MakeTlsConnector;
use super::Driver;
use errors::{Result, ResultExt};
pub struct Postgres {
client: Client,
}
impl Postgres {
pub fn new(url: &str) -> Result<Postgres> {
let config = Config::from_str(url)?;
let connector = TlsConnector::new().unwrap();
let connector = MakeTlsConnector::new(connector);
let client = config.connect(connector)?;
Postgres::from_client(client)
}
pub fn from_client(client: Client) -> Result<Postgres> {
let mut pg = Postgres { client };
pg.ensure_migration_table_exists();
Ok(pg)
}
}
impl Driver for Postgres {
fn ensure_migration_table_exists(&mut self) {
self.client
.simple_query(
"
CREATE TABLE IF NOT EXISTS __dbmigrate_table(id INTEGER, current INTEGER);
INSERT INTO __dbmigrate_table (id, current)
SELECT 1, 0
WHERE NOT EXISTS(SELECT * FROM __dbmigrate_table WHERE id = 1);
",
)
.unwrap();
}
fn remove_migration_table(&mut self) {
self.client
.execute("DROP TABLE __dbmigrate_table;", &[])
.unwrap();
}
fn get_current_number(&mut self) -> i32 {
let stmt = self
.client
.prepare(
"
SELECT current FROM __dbmigrate_table WHERE id = 1;
",
)
.unwrap();
let results = self.client.query(&stmt, &[]).unwrap();
results.first().unwrap().get("current")
}
fn set_current_number(&mut self, number: i32) {
let stmt = self
.client
.prepare("UPDATE __dbmigrate_table SET current = $1 WHERE id = 1;")
.unwrap();
self.client.execute(&stmt, &[&number]).unwrap();
}
fn migrate(&mut self, migration: String, number: i32) -> Result<()> {
self.client
.simple_query(&migration)
.chain_err(|| "Migration failed")?;
self.set_current_number(number);
Ok(())
}
}