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Add MDB_{FIRST,LAST}_DUP for cursor_get

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This commit is contained in:
Howard Chu 2011-09-03 15:19:24 -07:00
parent 9d821c26c3
commit f6edbd7793
2 changed files with 76 additions and 0 deletions
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20
libraries/libmdb/mdb.c
View file

@ -2781,9 +2781,29 @@ fetchm:
case MDB_FIRST:
rc = mdb_cursor_first(cursor, key, data);
break;
case MDB_FIRST_DUP:
if (data == NULL ||
!(cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPSORT) ||
!cursor->mc_initialized ||
!cursor->mc_xcursor->mx_cursor.mc_initialized) {
rc = EINVAL;
break;
}
rc = mdb_cursor_first(&cursor->mc_xcursor->mx_cursor, data, NULL);
break;
case MDB_LAST:
rc = mdb_cursor_last(cursor, key, data);
break;
case MDB_LAST_DUP:
if (data == NULL ||
!(cursor->mc_txn->mt_dbs[cursor->mc_dbi].md_flags & MDB_DUPSORT) ||
!cursor->mc_initialized ||
!cursor->mc_xcursor->mx_cursor.mc_initialized) {
rc = EINVAL;
break;
}
rc = mdb_cursor_last(&cursor->mc_xcursor->mx_cursor, data, NULL);
break;
default:
DPRINTF("unhandled/unimplemented cursor operation %u", op);
rc = EINVAL;

56
libraries/libmdb/mdb.h
View file

@ -175,11 +175,15 @@ typedef void (MDB_rel_func)(void *newptr, void *oldptr, size_t size);
/** Cursor operations */
typedef enum MDB_cursor_op {
MDB_FIRST, /**< Position at first key/data item */
MDB_FIRST_DUP, /**< Position at first data item of current key.
Only for #MDB_DUPSORT */
MDB_GET_BOTH, /**< Position at key/data pair. Only for #MDB_DUPSORT */
MDB_GET_BOTH_RANGE, /**< position at key, nearest data. Only for #MDB_DUPSORT */
MDB_GET_MULTIPLE, /**< Return all the duplicate data items at the current
cursor position. Only for #MDB_DUPFIXED */
MDB_LAST, /**< Position at last key/data item */
MDB_LAST_DUP, /**< Position at last data item of current key.
Only for #MDB_DUPSORT */
MDB_NEXT, /**< Position at next data item */
MDB_NEXT_DUP, /**< Position at next data item of current key.
Only for #MDB_DUPSORT */
@ -761,6 +765,58 @@ void mdb_cursor_close(MDB_cursor *cursor);
int mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
MDB_cursor_op op);
/** Store by cursor.
* This function stores key/data pairs into the database.
* If the function fails for any reason, the state of the cursor will be
* unchanged. If the function succeeds and an item is inserted into the
* database, the cursor is always positioned to refer to the newly inserted item.
* @param[in] cursor A cursor handle returned by #mdb_cursor_open()
* @param[in] key The key operated on.
* @param[in] data The data operated on.
* @param[in] flags Options for this operation. This parameter
* must be set to 0 or one of the values described here.
* <ul>
* <li>#MDB_CURRENT - overwrite the data of the key/data pair to which
* the cursor refers with the specified data item. The \b key
* parameter is ignored.
* <li>#MDB_NODUPDATA - enter the new key/data pair only if it does not
* already appear in the database. This flag may only be specified
* if the database was opened with #MDB_DUPSORT. The function will
* return #MDB_KEYEXIST if the key/data pair already appears in the
* database.
* <li>#MDB_NOOVERWRITE - enter the new key/data pair only if the key
* does not already appear in the database. The function will return
* #MDB_KEYEXIST if the key already appears in the database, even if
* the database supports duplicates (#MDB_DUPSORT).
* </ul>
* @return A non-zero error value on failure and 0 on success. Some possible
* errors are:
* <ul>
* <li>EACCES - an attempt was made to modify a read-only database.
* <li>EINVAL - an invalid parameter was specified.
* </ul>
*/
int mdb_cursor_put(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
unsigned int flags);
/** Delete current key/data pair
* This function deletes the key/data pair to which the cursor refers.
* @param[in] cursor A cursor handle returned by #mdb_cursor_open()
* @param[in] flags Options for this operation. This parameter
* must be set to 0 or one of the values described here.
* <ul>
* <li>#MDB_NODUPDATA - delete all of the data items for the current key.
* This flag may only be specified if the database was opened with #MDB_DUPSORT.
* </ul>
* @return A non-zero error value on failure and 0 on success. Some possible
* errors are:
* <ul>
* <li>EACCES - an attempt was made to modify a read-only database.
* <li>EINVAL - an invalid parameter was specified.
* </ul>
*/
int mdb_cursor_del(MDB_cursor *cursor, unsigned int flags);
/** Return count of duplicates for current key.
* This call is only valid on databases that support sorted duplicate
* data items #MDB_DUPSORT.