use libc::c_uint; use std::ffi::CString; use std::ptr; use ffi; use error::{Result, lmdb_result}; /// A handle to an individual database in an environment. /// /// A database handle denotes the name and parameters of a database in an environment. #[derive(Clone, Copy, Debug, Eq, PartialEq)] pub struct Database { dbi: ffi::MDB_dbi, } impl Database { /// Opens a new database handle in the given transaction. /// /// Prefer using `Environment::open_db`, `Environment::create_db`, `TransactionExt::open_db`, /// or `RwTransaction::create_db`. pub(crate) unsafe fn new(txn: *mut ffi::MDB_txn, name: Option<&str>, flags: c_uint) -> Result { let c_name = name.map(|n| CString::new(n).unwrap()); let name_ptr = if let Some(ref c_name) = c_name { c_name.as_ptr() } else { ptr::null() }; let mut dbi: ffi::MDB_dbi = 0; lmdb_result(ffi::mdb_dbi_open(txn, name_ptr, flags, &mut dbi))?; Ok(Database { dbi: dbi }) } /// Returns the underlying LMDB database handle. /// /// The caller **must** ensure that the handle is not used after the lifetime of the /// environment, or after the database has been closed. pub fn dbi(&self) -> ffi::MDB_dbi { self.dbi } } unsafe impl Sync for Database {} unsafe impl Send for Database {}