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extern crate r2d2;
extern crate rusqlite;
use std::error::{self, Error as StdError};
use std::fmt;
use std::convert;
use rusqlite::{Connection, Error as RusqliteError, OpenFlags};
#[derive(Debug)]
pub enum Error {
Connect(RusqliteError),
}
impl convert::From<RusqliteError> for Error {
fn from(e: RusqliteError) -> Error {
Error::Connect(e)
}
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "{}: {}", self.description(), self.cause().unwrap())
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::Connect(_) => "Error opening a connection",
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::Connect(ref err) => Some(err as &error::Error),
}
}
}
enum ConnectionConfig {
InMemory(OpenFlags),
File(String, OpenFlags),
}
pub struct SqliteConnectionManager {
config: ConnectionConfig,
}
impl SqliteConnectionManager {
pub fn new(database: &str) -> Self {
Self::new_with_flags(database, OpenFlags::default())
}
pub fn new_with_flags(database: &str, flags: OpenFlags) -> Self {
SqliteConnectionManager { config: ConnectionConfig::File(database.to_string(), flags) }
}
pub fn new_in_memory() -> Self {
Self::new_in_memory_with_flags(OpenFlags::default())
}
pub fn new_in_memory_with_flags(flags: OpenFlags) -> Self {
SqliteConnectionManager { config: ConnectionConfig::InMemory(flags) }
}
}
impl r2d2::ManageConnection for SqliteConnectionManager {
type Connection = Connection;
type Error = Error;
fn connect(&self) -> Result<Connection, Error> {
match self.config {
ConnectionConfig::InMemory(flags) => Connection::open_in_memory_with_flags(flags),
ConnectionConfig::File(ref path, flags) => Connection::open_with_flags(path, flags),
}
.map_err(Into::into)
}
fn is_valid(&self, conn: &mut Connection) -> Result<(), Error> {
conn.execute_batch("").map_err(Into::into)
}
fn has_broken(&self, _: &mut Connection) -> bool {
false
}
}