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Add MDB_SET_KEY cursor op

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Overwrites the passed in key with the DB's key
This commit is contained in:
Howard Chu 2012-09-17 02:17:25 -07:00
parent ab04c50a32
commit c542442c9f
2 changed files with 13 additions and 11 deletions
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23
libraries/libmdb/mdb.c
View file

@ -704,7 +704,7 @@ typedef struct MDB_node {
#define LEAF2KEY(p, i, ks) ((char *)(p) + PAGEHDRSZ + ((i)*(ks)))
/** Set the \b node's key into \b key, if requested. */
#define MDB_SET_KEY(node, key) { if ((key) != NULL) { \
#define MDB_GET_KEY(node, key) { if ((key) != NULL) { \
(key)->mv_size = NODEKSZ(node); (key)->mv_data = NODEKEY(node); } }
/** Information about a single database in the environment. */
@ -3895,7 +3895,7 @@ mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
}
}
MDB_SET_KEY(leaf, key);
MDB_GET_KEY(leaf, key);
return MDB_SUCCESS;
}
@ -3968,7 +3968,7 @@ mdb_cursor_prev(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
}
}
MDB_SET_KEY(leaf, key);
MDB_GET_KEY(leaf, key);
return MDB_SUCCESS;
}
@ -4000,7 +4000,7 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
nodekey.mv_data = LEAF2KEY(mp, 0, nodekey.mv_size);
} else {
leaf = NODEPTR(mp, 0);
MDB_SET_KEY(leaf, &nodekey);
MDB_GET_KEY(leaf, &nodekey);
}
rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
@ -4021,7 +4021,7 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
nkeys-1, nodekey.mv_size);
} else {
leaf = NODEPTR(mp, nkeys-1);
MDB_SET_KEY(leaf, &nodekey);
MDB_GET_KEY(leaf, &nodekey);
}
rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
@ -4039,7 +4039,7 @@ mdb_cursor_set(MDB_cursor *mc, MDB_val *key, MDB_val *data,
mc->mc_ki[mc->mc_top], nodekey.mv_size);
} else {
leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]);
MDB_SET_KEY(leaf, &nodekey);
MDB_GET_KEY(leaf, &nodekey);
}
rc = mc->mc_dbx->md_cmp(key, &nodekey);
if (rc == 0) {
@ -4111,7 +4111,7 @@ set1:
}
if (data) {
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
if (op == MDB_SET || op == MDB_SET_RANGE) {
if (op == MDB_SET || op == MDB_SET_KEY || op == MDB_SET_RANGE) {
rc = mdb_cursor_first(&mc->mc_xcursor->mx_cursor, data, NULL);
} else {
int ex2, *ex2p;
@ -4144,8 +4144,8 @@ set1:
}
/* The key already matches in all other cases */
if (op == MDB_SET_RANGE)
MDB_SET_KEY(leaf, key);
if (op == MDB_SET_RANGE || op == MDB_SET_KEY)
MDB_GET_KEY(leaf, key);
DPRINTF("==> cursor placed on key [%s]", DKEY(key));
return rc;
@ -4190,7 +4190,7 @@ mdb_cursor_first(MDB_cursor *mc, MDB_val *key, MDB_val *data)
return rc;
}
}
MDB_SET_KEY(leaf, key);
MDB_GET_KEY(leaf, key);
return MDB_SUCCESS;
}
@ -4239,7 +4239,7 @@ mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data)
}
}
MDB_SET_KEY(leaf, key);
MDB_GET_KEY(leaf, key);
return MDB_SUCCESS;
}
@ -4261,6 +4261,7 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data,
}
/* FALLTHRU */
case MDB_SET:
case MDB_SET_KEY:
case MDB_SET_RANGE:
if (key == NULL || key->mv_size == 0 || key->mv_size > MAXKEYSIZE) {
rc = EINVAL;

1
libraries/libmdb/mdb.h
View file

@ -247,6 +247,7 @@ typedef enum MDB_cursor_op {
MDB_PREV_NODUP, /**< Position at last data item of previous key.
Only for #MDB_DUPSORT */
MDB_SET, /**< Position at specified key */
MDB_SET_KEY, /**< Position at specified key, return key + data */
MDB_SET_RANGE /**< Position at first key greater than or equal to specified key. */
} MDB_cursor_op;