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Merge pull request #322 from traviscross/improvement/add-comment-about-mut-connection

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Add comment to justify `&mut Connection` in `Transaction`
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gwenn 2018-03-24 03:04:42 +01:00 committed by GitHub
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src/transaction.rs
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@ -94,6 +94,9 @@ pub struct Savepoint<'conn> {
impl<'conn> Transaction<'conn> { impl<'conn> Transaction<'conn> {
/// Begin a new transaction. Cannot be nested; see `savepoint` for nested transactions. /// Begin a new transaction. Cannot be nested; see `savepoint` for nested transactions.
// Even though we don't mutate the connection, we take a `&mut Connection`
// so as to prevent nested or concurrent transactions on the same
// connection.
pub fn new(conn: &mut Connection, behavior: TransactionBehavior) -> Result<Transaction> { pub fn new(conn: &mut Connection, behavior: TransactionBehavior) -> Result<Transaction> {
let query = match behavior { let query = match behavior {
TransactionBehavior::Deferred => "BEGIN DEFERRED", TransactionBehavior::Deferred => "BEGIN DEFERRED",