Skip to main content

Viewing MySQL Metadata

The INFORMATION_SCHEMA is a virtual database that is automatically created and populated by
MySQL, there is no need to create an INFORMATION_SCHEMA database. There also is no associated
file structure due to the fact that the contents of the data are actual views, rather than logical data being
stored in any one location. Only SELECT statements are allowed against the tables in the
INFORMATION_SCHEMA database. The following SELECT example demonstrates some of the
metadata that can be viewed:

<?php
// Load variables used in mysql_connect and connect to server
include "connect_info.php";
$linkID1 = mysql_connect($dbhost,$dbuser,$dbpass) or
die("Could not connect to MySQL server");
// Execute Query to Collect Metadata
$query = "SELECT TABLE_NAME, ENGINE, TABLE_ROWS, UPDATE_TIME FROM
INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='world'";
$results = mysql_query($query, $linkID1);
// Build HTML Table of Results
print "<table width='700' border='1'>\n";
print "<tr>\n<th>TABLE_NAME</th>\n<th>ENGINE</th>\n";
print "<th>TABLE_ROWS</th>\n<th>UPDATE_TIME</th>\n</tr>\n";
while ($row = mysql_fetch_array($results, MYSQL_BOTH)) {
print "<tr>\n<th>".$row[0]."</th>\n<th>".$row[1]."</th>\n";
print "<th>".$row[2]."</th>\n<th>".$row[3]."</th>\n</tr>\n ";
}
print "</table>";
// Close the connection to the MySQL server
mysql_close($linkID1);
?>
Labels:

Comments

Post a Comment

Popular posts from this blog

PHP INTRODUCTION

                     PHP  (recursive acronym for  PHP: Hypertext Preprocessor ) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. PHP stands for  P HP:  H ypertext  P reprocessor PHP is a server-side scripting language, like ASP PHP scripts are executed on the server PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.) PHP is an open source software PHP is free to download and use Why PHP? PHP runs on different platforms (Windows, Linux, Unix, etc.) PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP is FREE to download from the official PHP resource:  www.php.net PHP is easy to learn and runs efficiently on the server side What can PHP do? Anything. PHP is mainly focused on server-side scripting, so you can...
6 comments
Read more

Data Encryption

Data encryption is the process of scrambling stored or transmitted information so that it is unintelligible until it is unscrambled by the intended recipient. The intended recipient can then decode (or decrypt) the information. PHP offers multiple means to make this happen. However, none of these solutions are very effective without the applications running on secure servers and connections. The following are a list of the more common encryption functions in PHP: • md5() - MD5 is a third-party hash algorithm that PHP can use to create a digital fingerprint of a piece of data. It is next to impossible to (efficiently) recover the original text when a piece of data has been encrypted with the md5 hash algorithm. It is also vastly unlikely that any different text string will create an identical hash - a 'hash collision'. These properties make hashes ideally suited for storing an application's passwords because although an attacker may compromise a part of the system...
2 comments
Read more

Delimiting PHP Code

                           PHP was originally designed to be used in conjunction with a web server, and in the case of the LAMP architecture, the Apache Web Server.  PHP applications are designed embedding PHP scripts within a web page along with its HTML.  Unlike standard HTML pages which are sent directly from the web server to the end user, PHP files are first interpreted by the PHP application which then converts the PHP script into another form for display.  This process eliminates the end user from being able to see the original PHP script that was embedded in the HTML and provides  true interaction in HTML files.  This process is similar to proprietary applications such as ASP and Coldfusion; however, PHP is Open Source and cross- platform. PHP Tags             PHP scripts are distinguished from the HTML scripts by using delimiting characters ...
1 comment
Read more