C++ (Cpp) WT_MD_CURSOR_NEEDKEY示例

示例#1

文件： cur_metadata.c 项目： lujudy/wiredtiger

/*
 * __curmetadata_update --
 *	WT_CURSOR->update method for the metadata cursor type.
 */
static int
__curmetadata_update(WT_CURSOR *cursor)
{
	WT_CURSOR *file_cursor;
	WT_CURSOR_METADATA *mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	mdc = (WT_CURSOR_METADATA *)cursor;
	file_cursor = mdc->file_cursor;
	CURSOR_API_CALL(cursor, session,
	    update, ((WT_CURSOR_BTREE *)file_cursor)->btree);

	WT_MD_CURSOR_NEEDKEY(cursor);
	WT_MD_CURSOR_NEEDVALUE(cursor);

	/*
	 * Since the key/value formats are 's' the WT_ITEMs must contain a
	 * NULL terminated string.
	 */
	ret =
	    __wt_metadata_update(session, cursor->key.data, cursor->value.data);

err:	API_END(session, ret);
	return (ret);
}

示例#2

文件： cur_metadata.c 项目： lujudy/wiredtiger

/*
 * __curmetadata_search_near --
 *	WT_CURSOR->search_near method for the metadata cursor type.
 */
static int
__curmetadata_search_near(WT_CURSOR *cursor, int *exact)
{
	WT_CURSOR *file_cursor;
	WT_CURSOR_METADATA *mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	mdc = (WT_CURSOR_METADATA *)cursor;
	file_cursor = mdc->file_cursor;
	CURSOR_API_CALL(cursor, session,
	    search_near, ((WT_CURSOR_BTREE *)file_cursor)->btree);

	WT_MD_CURSOR_NEEDKEY(cursor);

	if (WT_STRING_MATCH(
	    (char *)cursor->key.data, "metadata:", cursor->key.size - 1)) {
		WT_ERR(__curmetadata_metadata_search(session, cursor));
		*exact = 1;
	} else {
		WT_ERR(file_cursor->search_near(file_cursor, exact));
		WT_MD_SET_KEY_VALUE(cursor, mdc, file_cursor);
	}

err:	if (ret != 0) {
		F_CLR(mdc, WT_MDC_POSITIONED | WT_MDC_ONMETADATA);
		F_CLR(cursor, WT_CURSTD_KEY_EXT | WT_CURSTD_VALUE_EXT);
	}
	API_END(session, ret);
	return (ret);
}

示例#3

文件： cur_metadata.c 项目： EaseTech/wiredtiger

/*
 * __curmetadata_search --
 *	WT_CURSOR->search method for the metadata cursor type.
 */
static int
__curmetadata_search(WT_CURSOR *cursor)
{
	WT_CURSOR *file_cursor;
	WT_CURSOR_METADATA *mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	mdc = (WT_CURSOR_METADATA *)cursor;
	file_cursor = mdc->file_cursor;
	CURSOR_API_CALL(cursor, session,
	    search, ((WT_CURSOR_BTREE *)file_cursor)->btree);

	WT_MD_CURSOR_NEEDKEY(cursor);

	if (WT_KEY_IS_METADATA(&cursor->key))
		WT_ERR(__curmetadata_metadata_search(session, cursor));
	else {
		WT_ERR(file_cursor->search(file_cursor));
		WT_MD_SET_KEY_VALUE(cursor, mdc, file_cursor);
	}

err:	if (ret != 0) {
		F_CLR(mdc, WT_MDC_POSITIONED | WT_MDC_ONMETADATA);
		F_CLR(cursor, WT_CURSTD_KEY_EXT | WT_CURSTD_VALUE_EXT);
	}
	API_END_RET(session, ret);
}

示例#4

文件： cur_metadata.c 项目： GYGit/mongo

/*
 * __curmetadata_search_near --
 *	WT_CURSOR->search_near method for the metadata cursor type.
 */
static int
__curmetadata_search_near(WT_CURSOR *cursor, int *exact)
{
	WT_CURSOR *file_cursor;
	WT_CURSOR_METADATA *mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	mdc = (WT_CURSOR_METADATA *)cursor;
	file_cursor = mdc->file_cursor;
	CURSOR_API_CALL(cursor, session,
	    search_near, ((WT_CURSOR_BTREE *)file_cursor)->btree);

	WT_MD_CURSOR_NEEDKEY(cursor);

	if (WT_KEY_IS_METADATA(&cursor->key)) {
		WT_ERR(__curmetadata_metadata_search(session, cursor));
		*exact = 1;
	} else {
		WT_WITH_TXN_ISOLATION(session, WT_ISO_READ_UNCOMMITTED,
		    ret = file_cursor->search_near(file_cursor, exact));
		WT_ERR(ret);
		WT_ERR(__curmetadata_setkv(mdc, file_cursor));
	}

err:	if (ret != 0) {
		F_CLR(mdc, WT_MDC_POSITIONED | WT_MDC_ONMETADATA);
		F_CLR(cursor, WT_CURSTD_KEY_EXT | WT_CURSTD_VALUE_EXT);
	}
	API_END_RET(session, ret);
}

示例#5

文件： cur_metadata.c 项目： lujudy/wiredtiger

/*
 * __curmetadata_compare --
 *	WT_CURSOR->compare method for the metadata cursor type.
 */
static int
__curmetadata_compare(WT_CURSOR *a, WT_CURSOR *b, int *cmpp)
{
	WT_CURSOR *a_file_cursor, *b_file_cursor;
	WT_CURSOR_METADATA *a_mdc, *b_mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	a_mdc = ((WT_CURSOR_METADATA *)a);
	b_mdc = ((WT_CURSOR_METADATA *)b);
	a_file_cursor = a_mdc->file_cursor;
	b_file_cursor = b_mdc->file_cursor;

	CURSOR_API_CALL(a, session,
	    compare, ((WT_CURSOR_BTREE *)a_file_cursor)->btree);

	if (b->compare != __curmetadata_compare)
		WT_ERR_MSG(session, EINVAL,
		    "Can only compare cursors of the same type");

	WT_MD_CURSOR_NEEDKEY(a);
	WT_MD_CURSOR_NEEDKEY(b);

	if (F_ISSET(a_mdc, WT_MDC_ONMETADATA)) {
		if (F_ISSET(b_mdc, WT_MDC_ONMETADATA))
			*cmpp = 0;
		else
			*cmpp = 1;
	} else if (F_ISSET(b_mdc, WT_MDC_ONMETADATA))
		*cmpp = -1;
	else
		ret = a_file_cursor->compare(
		    a_file_cursor, b_file_cursor, cmpp);

err:	API_END(session, ret);
	return (ret);
}

示例#6

文件： cur_metadata.c 项目： EaseTech/wiredtiger

/*
 * __curmetadata_remove --
 *	WT_CURSOR->remove method for the metadata cursor type.
 */
static int
__curmetadata_remove(WT_CURSOR *cursor)
{
	WT_CURSOR *file_cursor;
	WT_CURSOR_METADATA *mdc;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	mdc = (WT_CURSOR_METADATA *)cursor;
	file_cursor = mdc->file_cursor;
	CURSOR_API_CALL(cursor, session,
	    remove, ((WT_CURSOR_BTREE *)file_cursor)->btree);

	WT_MD_CURSOR_NEEDKEY(cursor);

	/*
	 * Since the key format is 's' the WT_ITEM must contain a NULL
	 * terminated string.
	 */
	ret = __wt_metadata_remove(session, cursor->key.data);

err:	API_END_RET(session, ret);
}