Struct lmdb_sys::MDB_val

#[repr(C)]
pub struct MDB_val {
    pub mv_size: usize,
    pub mv_data: *mut c_void,
}

@brief Generic structure used for passing keys and data in and out of the database.

Values returned from the database are valid only until a subsequent update operation, or the end of the transaction. Do not modify or free them, they commonly point into the database itself.

Key sizes must be between 1 and #mdb_env_get_maxkeysize() inclusive. The same applies to data sizes in databases with the #MDB_DUPSORT flag. Other data items can in theory be from 0 to 0xffffffff bytes long.

Fields

mv_size: usize

< size of the data item

mv_data: *mut c_void

< address of the data item

Trait Implementations

impl Clone for MDB_val

fn clone(&self) -> MDB_val

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MDB_val

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for MDB_val