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use mysql_client::{from_row, Pool};
use super::Driver;
use errors::{Result, ResultExt};
#[derive(Debug)]
pub struct Mysql {
pool: Pool
}
impl Mysql {
pub fn new(url: &str) -> Result<Mysql> {
let pool = Pool::new(url)?;
let mut mysql = Mysql { pool: pool };
mysql.ensure_migration_table_exists();
Ok(mysql)
}
}
impl Driver for Mysql {
fn ensure_migration_table_exists(&mut self) {
let mut conn = self.pool.get_conn().unwrap();
conn.query("
CREATE TABLE IF NOT EXISTS __dbmigrate_table(id INTEGER, current INTEGER);
INSERT INTO __dbmigrate_table (id, current)
SELECT 1, 0 FROM DUAL
WHERE NOT EXISTS(SELECT * FROM __dbmigrate_table WHERE id = 1);
").unwrap();
}
fn remove_migration_table(&mut self) {
self.pool.prep_exec("DROP TABLE __dbmigrate_table;", ()).unwrap();
}
fn get_current_number(&mut self) -> i32 {
let mut result = self.pool.prep_exec("
SELECT current FROM __dbmigrate_table WHERE id = 1;
", ()).unwrap();
let row = result.next().unwrap();
from_row::<i32>(row.unwrap())
}
fn set_current_number(&mut self, number: i32) {
self.pool.prep_exec(
"UPDATE __dbmigrate_table SET current = ? WHERE id = 1;",
(&number, )
).unwrap();
}
fn migrate(&mut self, migration: String, number: i32) -> Result<()> {
let mut conn = self.pool.get_conn()?;
conn.query(migration).chain_err(|| "Migration failed")?;
self.set_current_number(number);
Ok(())
}
}