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mod statement_cache;
mod transaction_manager;
use backend::Backend;
use query_builder::{AsQuery, QueryFragment, QueryId};
use query_source::Queryable;
use result::*;
use types::HasSqlType;
pub use self::transaction_manager::{TransactionManager, AnsiTransactionManager};
#[doc(hidden)]
pub use self::statement_cache::{StatementCache, StatementCacheKey, MaybeCached};
pub trait SimpleConnection {
fn batch_execute(&self, query: &str) -> QueryResult<()>;
}
pub trait Connection: SimpleConnection + Sized + Send {
type Backend: Backend;
#[doc(hidden)]
type TransactionManager: TransactionManager<Self>;
fn establish(database_url: &str) -> ConnectionResult<Self>;
fn transaction<T, E, F>(&self, f: F) -> Result<T, E> where
F: FnOnce() -> Result<T, E>,
E: From<Error>,
{
let transaction_manager = self.transaction_manager();
try!(transaction_manager.begin_transaction(self));
match f() {
Ok(value) => {
try!(transaction_manager.commit_transaction(self));
Ok(value)
},
Err(e) => {
try!(transaction_manager.rollback_transaction(self));
Err(e)
},
}
}
fn begin_test_transaction(&self) -> QueryResult<()> {
let transaction_manager = self.transaction_manager();
assert_eq!(transaction_manager.get_transaction_depth(), 0);
transaction_manager.begin_transaction(self)
}
fn test_transaction<T, E, F>(&self, f: F) -> T where
F: FnOnce() -> Result<T, E>,
{
let mut user_result = None;
let _ = self.transaction::<(), _, _>(|| {
user_result = f().ok();
Err(Error::RollbackTransaction)
});
user_result.expect("Transaction did not succeed")
}
#[doc(hidden)]
fn execute(&self, query: &str) -> QueryResult<usize>;
#[doc(hidden)]
fn query_by_index<T, U>(&self, source: T) -> QueryResult<Vec<U>> where
T: AsQuery,
T::Query: QueryFragment<Self::Backend> + QueryId,
Self::Backend: HasSqlType<T::SqlType>,
U: Queryable<T::SqlType, Self::Backend>;
#[doc(hidden)]
fn execute_returning_count<T>(&self, source: &T) -> QueryResult<usize> where
T: QueryFragment<Self::Backend> + QueryId;
#[doc(hidden)] fn silence_notices<F: FnOnce() -> T, T>(&self, f: F) -> T;
#[doc(hidden)] fn transaction_manager(&self) -> &Self::TransactionManager;
#[doc(hidden)] fn setup_helper_functions(&self);
}