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//! Firebird transaction types
//!
//! More info about transactions in firebird:
//! <https://firebirdsql.org/file/documentation/html/en/refdocs/fblangref30/firebird-30-language-reference.html#fblangref30-transacs>
use crate::*;
/// Transaction isolation level
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub enum TrIsolationLevel {
/// Transactions can't see alterations commited after they started
Concurrency,
/// Table locking
Consistency,
/// Transactions can see alterations commited after they started
ReadCommited(TrRecordVersion),
}
impl Default for TrIsolationLevel {
fn default() -> Self {
Self::ReadCommited(TrRecordVersion::default())
}
}
impl From<TrIsolationLevel> for u8 {
fn from(tp: TrIsolationLevel) -> Self {
match tp {
TrIsolationLevel::Concurrency => ibase::isc_tpb_concurrency as u8,
TrIsolationLevel::Consistency => ibase::isc_tpb_consistency as u8,
TrIsolationLevel::ReadCommited(_) => ibase::isc_tpb_read_committed as u8,
}
}
}
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
/// Commit / Rollback operations
pub enum TrOp {
Commit,
CommitRetaining,
Rollback,
RollbackRetaining,
}
/// Lock resolution modes
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub enum TrLockResolution {
/// In the NO WAIT mode, a transaction will immediately throw a database exception if a conflict occurs
NoWait,
/// In the WAIT model, transaction will wait till the other transaction has finished.
///
/// If a TIMEOUT is specified for the WAIT transaction, waiting will continue only for the number of seconds specified
Wait(Option<u32>),
}
impl Default for TrLockResolution {
fn default() -> Self {
Self::Wait(None)
}
}
impl From<TrLockResolution> for u8 {
fn from(tp: TrLockResolution) -> Self {
match tp {
TrLockResolution::NoWait => ibase::isc_tpb_nowait as u8,
TrLockResolution::Wait(_) => ibase::isc_tpb_wait as u8,
}
}
}
/// Data access mode
#[repr(u8)]
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub enum TrDataAccessMode {
/// Operations in the context of this transaction can be both read operations and data update operations
ReadWrite = ibase::isc_tpb_write as u8,
/// Only SELECT operations can be executed in the context of this transaction
ReadOnly = ibase::isc_tpb_read as u8,
}
impl Default for TrDataAccessMode {
fn default() -> Self {
Self::ReadWrite
}
}
/// Record version isolation
#[repr(u8)]
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub enum TrRecordVersion {
/// Is a kind of two-phase locking mechanism: it will make the transaction unable to write to any row that has an update pending from another transaction
RecordVersion = ibase::isc_tpb_rec_version as u8,
/// The transaction reads the latest committed version of the row, regardless of other pending versions of the row.
NoRecordVersion = ibase::isc_tpb_no_rec_version as u8,
}
impl Default for TrRecordVersion {
fn default() -> Self {
Self::NoRecordVersion
}
}
/// Parameters of a new transaction
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub struct TransactionConfiguration {
pub data_access: TrDataAccessMode,
pub isolation: TrIsolationLevel,
pub lock_resolution: TrLockResolution,
}
impl Default for TransactionConfiguration {
fn default() -> Self {
Self {
data_access: TrDataAccessMode::default(),
isolation: TrIsolationLevel::default(),
lock_resolution: TrLockResolution::default(),
}
}
}