At 8:44 AM -0400 4/25/07, Kebbel, John wrote:
I've been developing Perl/ PHP and MySQL applications on a small
scale for years, reworking my small core of knowledge over and over
again. I recently decided to hit the books and shoot for
certification as a MySQL CMDEV. Most of my questions have answers in
my books and on web sites, but I occassionally run into stuff so
weird, I don't even know how to phrase a web query. For example,
what is this? It appears at the top of a data dump. I recognize the
Create and Insert sections, but this is Greek.
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS,
FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
Those are code-containing comments, such that the code will be executed
only if the server is as recent as the version number at the beginning
of the comment.
http://dev.mysql.com/doc/refman/5.0/en/comments.html
Basically, it's version-specific code for features that are unavailable
in older servers.
--
Paul DuBois, MySQL Documentation Team
Madison, Wisconsin, USA
MySQL AB, www.mysql.com
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