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use futures::{Future, BoxFuture};
use futures_state_stream::{StateStream, BoxStateStream};
use {Connection, TransactionNew};
use error::Error;
use stmt::Statement;
use types::ToSql;
use rows::Row;
#[derive(Debug)]
pub struct Transaction(Connection);
impl TransactionNew for Transaction {
fn new(c: Connection) -> Transaction {
Transaction(c)
}
}
impl Transaction {
pub fn batch_execute(self, query: &str) -> BoxFuture<Transaction, Error<Transaction>> {
self.0
.batch_execute(query)
.map(Transaction)
.map_err(transaction_err)
.boxed()
}
pub fn prepare(self, query: &str) -> BoxFuture<(Statement, Transaction), Error<Transaction>> {
self.0
.prepare(query)
.map(|(s, c)| (s, Transaction(c)))
.map_err(transaction_err)
.boxed()
}
pub fn execute(self,
statement: &Statement,
params: &[&ToSql])
-> BoxFuture<(u64, Transaction), Error<Transaction>> {
self.0
.execute(statement, params)
.map(|(n, c)| (n, Transaction(c)))
.map_err(transaction_err)
.boxed()
}
pub fn query(self,
statement: &Statement,
params: &[&ToSql])
-> BoxStateStream<Row, Transaction, Error<Transaction>> {
self.0
.query(statement, params)
.map_state(Transaction)
.map_err(transaction_err)
.boxed()
}
pub fn commit(self) -> BoxFuture<Connection, Error> {
self.finish("COMMIT")
}
pub fn rollback(self) -> BoxFuture<Connection, Error> {
self.finish("ROLLBACK")
}
fn finish(self, query: &str) -> BoxFuture<Connection, Error> {
self.0
.simple_query(query)
.map(|(_, c)| c)
.boxed()
}
}
fn transaction_err(e: Error) -> Error<Transaction> {
match e {
Error::Io(e) => Error::Io(e),
Error::Db(e, c) => Error::Db(e, Transaction(c)),
Error::Conversion(e, c) => Error::Conversion(e, Transaction(c)),
}
}