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//! `Transaction` is a structure representing an interactive transaction.
use crate::{Client, ResultSet, Statement, SyncClient};
use anyhow::Result;
pub struct Transaction<'a> {
pub(crate) id: u64,
pub(crate) client: &'a Client,
}
impl<'a> Transaction<'a> {
pub async fn new(client: &'a Client, id: u64) -> Result<Transaction<'a>> {
client
.execute_in_transaction(id, Statement::from("BEGIN"))
.await?;
Ok(Self { id, client })
}
/// Executes a statement within the current transaction.
/// # Example
///
/// ```rust,no_run
/// # async fn f() -> anyhow::Result<()> {
/// # use crate::libsql_client::{Statement, args};
/// let mut db = libsql_client::Client::from_env().await?;
/// let tx = db.transaction().await?;
/// tx.execute(Statement::with_args("INSERT INTO users (name) VALUES (?)", args!["John"])).await?;
/// let res = tx.execute(Statement::with_args("INSERT INTO users (name) VALUES (?)", args!["Jane"])).await;
/// if res.is_err() {
/// tx.rollback().await?;
/// } else {
/// tx.commit().await?;
/// }
/// # Ok(())
/// # }
/// ```
pub async fn execute(&self, stmt: impl Into<Statement>) -> Result<ResultSet> {
self.client
.execute_in_transaction(self.id, stmt.into())
.await
}
/// Commits the transaction to the database.
pub async fn commit(self) -> Result<()> {
self.client.commit_transaction(self.id).await
}
/// Rolls back the transaction, cancelling any of its side-effects.
pub async fn rollback(self) -> Result<()> {
self.client.rollback_transaction(self.id).await
}
}
pub struct SyncTransaction<'a> {
pub(crate) id: u64,
pub(crate) client: &'a SyncClient,
}
impl<'a> SyncTransaction<'a> {
pub fn new(client: &'a SyncClient, id: u64) -> Result<SyncTransaction<'a>> {
client.execute_in_transaction(id, Statement::from("BEGIN"))?;
Ok(Self { id, client })
}
/// Executes a statement within the current transaction.
/// # Example
///
/// ```rust,no_run
/// # fn f() -> anyhow::Result<()> {
/// # use crate::libsql_client::{Statement, args};
/// let mut db = libsql_client::SyncClient::from_env()?;
/// let tx = db.transaction()?;
/// tx.execute(Statement::with_args("INSERT INTO users (name) VALUES (?)", args!["John"]))?;
/// let res = tx.execute(Statement::with_args("INSERT INTO users (name) VALUES (?)", args!["Jane"]));
/// if res.is_err() {
/// tx.rollback()?;
/// } else {
/// tx.commit()?;
/// }
/// # Ok(())
/// # }
/// ```
pub fn execute(&self, stmt: impl Into<Statement>) -> Result<ResultSet> {
self.client.execute_in_transaction(self.id, stmt.into())
}
/// Commits the transaction to the database.
pub fn commit(self) -> Result<()> {
self.client.commit_transaction(self.id)
}
/// Rolls back the transaction, cancelling any of its side-effects.
pub fn rollback(self) -> Result<()> {
self.client.rollback_transaction(self.id)
}
}