Function lmdb_master_sys::mdb_cursor_count

source · 
pub unsafe extern "C" fn mdb_cursor_count(
    cursor: *mut MDB_cursor,
    countp: *mut mdb_size_t,
) -> c_int
Expand description

Return count of duplicates for current key.

This call is only valid on databases that support sorted duplicate data items #MDB_DUPSORT.

§Arguments

  • cursor (direction in) - A cursor handle returned by #mdb_cursor_open()
  • countp (direction out) - Address where the count will be stored

§Returns

A non-zero error value on failure and 0 on success. Some possible errors are:

  • EINVAL - cursor is not initialized, or an invalid parameter was specified.