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use sqlite_client::Connection;
use super::Driver;
use errors::{Result, ResultExt};
#[derive(Debug)]
pub struct Sqlite {
conn: Connection
}
impl Sqlite {
pub fn new(url: &str) -> Result<Sqlite> {
let conn = Connection::open(url.replace("sqlite:/", ""))?;
let mut sqlite = Sqlite { conn: conn };
sqlite.ensure_migration_table_exists();
Ok(sqlite)
}
}
impl Driver for Sqlite {
fn ensure_migration_table_exists(&mut self) {
self.conn.execute_batch("
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.conn.execute("DROP TABLE __dbmigrate_table;", &[]).unwrap();
}
fn get_current_number(&mut self) -> i32 {
self.conn.query_row("
SELECT current FROM __dbmigrate_table WHERE id = 1;
", &[], |row| { row.get(0)}).unwrap()
}
fn set_current_number(&mut self, number: i32) {
let mut stmt = self.conn.prepare(
"UPDATE __dbmigrate_table SET current = ? WHERE id = 1;"
).unwrap();
stmt.execute(&[&number]).unwrap();
}
fn migrate(&mut self, migration: String, number: i32) -> Result<()> {
self.conn.execute_batch(&migration).chain_err(|| "Migration failed")?;
self.set_current_number(number);
Ok(())
}
}