C++ (Cpp) WT_IKEY_DATA Examples

Example #1

File: rec_merge.c Project: ckoolkarni/wiredtiger

/*
 * __merge_promote_key --
 *	Copy a key from a child page into the reference in its parent, so it
 *	can be found by searches.
 */
static int
__merge_promote_key(WT_SESSION_IMPL *session, WT_REF *ref)
{
	WT_IKEY *ikey;
	WT_PAGE *page;
	WT_REF *child_ref;

	page = ref->page;
	switch (page->type) {
	case WT_PAGE_COL_INT:
		child_ref = &page->u.intl.t[0];
		ref->u.recno = page->u.intl.recno = child_ref->u.recno;
		return (0);

	case WT_PAGE_ROW_INT:
		child_ref = &page->u.intl.t[0];
		ikey = child_ref->u.key;
		WT_ASSERT(session, ikey != NULL);
		return (__wt_row_ikey_incr(session,
		    page, 0, WT_IKEY_DATA(ikey), ikey->size, &ref->u.key));

	WT_ILLEGAL_VALUE(session);
	}
}

Example #2

File: bt_ret.c Project: zinuyasha/wiredtiger

/*
 * __wt_kv_return --
 *	Return a page referenced key/value pair to the application.
 */
int
__wt_kv_return(WT_SESSION_IMPL *session, WT_CURSOR_BTREE *cbt, int key_ret)
{
	WT_BTREE *btree;
	WT_CELL *cell;
	WT_CELL_UNPACK *unpack, _unpack;
	WT_CURSOR *cursor;
	WT_IKEY *ikey;
	WT_PAGE *page;
	WT_ROW *rip;
	WT_UPDATE *upd;
	uint8_t v;

	btree = session->btree;
	unpack = &_unpack;

	page = cbt->page;
	cursor = &cbt->iface;

	switch (page->type) {
	case WT_PAGE_COL_FIX:
		if (key_ret)
			cursor->recno = cbt->recno;

		/*
		 * If the cursor references a WT_INSERT item, take the related
		 * WT_UPDATE item.
		 */
		if (cbt->ins != NULL) {
			upd = cbt->ins->upd;
			cursor->value.data = WT_UPDATE_DATA(upd);
			cursor->value.size = upd->size;
			return (0);
		}
		v = __bit_getv_recno(page, cbt->iface.recno, btree->bitcnt);
		return (__wt_buf_set(session, &cursor->value, &v, 1));
	case WT_PAGE_COL_VAR:
		if (key_ret)
			cursor->recno = cbt->recno;

		/*
		 * If the cursor references a WT_INSERT item, take the related
		 * WT_UPDATE item.
		 */
		if (cbt->ins != NULL) {
			upd = cbt->ins->upd;
			cursor->value.data = WT_UPDATE_DATA(upd);
			cursor->value.size = upd->size;
			return (0);
		}
		cell = WT_COL_PTR(page, &page->u.col_var.d[cbt->slot]);
		break;
	case WT_PAGE_ROW_LEAF:
		rip = &page->u.row.d[cbt->slot];

		/*
		 * If the cursor references a WT_INSERT item, take the key and
		 * related WT_UPDATE item.   Otherwise, take the key from the
		 * original page, and the value from any related WT_UPDATE item,
		 * or the page if the key was never updated.
		 */
		if (cbt->ins == NULL) {
			if (key_ret) {
				if (__wt_off_page(page, rip->key)) {
					ikey = rip->key;
					cursor->key.data = WT_IKEY_DATA(ikey);
					cursor->key.size = ikey->size;
				} else
					WT_RET(__wt_row_key(
					    session, page, rip, &cursor->key));
			}
			upd = WT_ROW_UPDATE(page, rip);
		} else {
			if (key_ret) {
				cursor->key.data = WT_INSERT_KEY(cbt->ins);
				cursor->key.size = WT_INSERT_KEY_SIZE(cbt->ins);
			}
			upd = cbt->ins->upd;
		}
		if (upd != NULL) {
			cursor->value.data = WT_UPDATE_DATA(upd);
			cursor->value.size = upd->size;
			return (0);
		}

		/* Take the original cell (which may be empty). */
		if ((cell = __wt_row_value(page, rip)) == NULL) {
			cursor->value.size = 0;
			return (0);
		}
		break;
	WT_ILLEGAL_VALUE(session);
	}

	/* It's a cell, unpack and expand it as necessary. */
	__wt_cell_unpack(cell, unpack);
	if (btree->huffman_value == NULL && unpack->type == WT_CELL_VALUE) {
		cursor->value.data = unpack->data;
		cursor->value.size = unpack->size;
		return (0);
	} else
		return (__wt_cell_unpack_copy(session, unpack, &cursor->value));
}