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    <p>SequelPro and Magento both utilize the SHOW CREATE TABLE query to load the foreign key information. Magento's implementation is the one I am going to reference since it's both a PHP based system and one that both of us are very familiar with. However, the following code snippets can be applied to any PHP based system.</p> <p>The parsing is done in the <code>Varien_Db_Adapter_Pdo_Mysql::getForeignKeys()</code> method (<a href="http://svn.magentocommerce.com/source/branches/1.6/lib/Varien/Db/Adapter/Pdo/Mysql.php" rel="nofollow">the code for this class can be found here</a>) using a relatively simple RegEx:</p> <pre><code> $createSql = $this->getCreateTable($tableName, $schemaName); // collect CONSTRAINT $regExp = '#,\s+CONSTRAINT `([^`]*)` FOREIGN KEY \(`([^`]*)`\) ' . 'REFERENCES (`[^`]*\.)?`([^`]*)` \(`([^`]*)`\)' . '( ON DELETE (RESTRICT|CASCADE|SET NULL|NO ACTION))?' . '( ON UPDATE (RESTRICT|CASCADE|SET NULL|NO ACTION))?#'; $matches = array(); preg_match_all($regExp, $createSql, $matches, PREG_SET_ORDER); foreach ($matches as $match) { $ddl[strtoupper($match[1])] = array( 'FK_NAME' => $match[1], 'SCHEMA_NAME' => $schemaName, 'TABLE_NAME' => $tableName, 'COLUMN_NAME' => $match[2], 'REF_SHEMA_NAME' => isset($match[3]) ? $match[3] : $schemaName, 'REF_TABLE_NAME' => $match[4], 'REF_COLUMN_NAME' => $match[5], 'ON_DELETE' => isset($match[6]) ? $match[7] : '', 'ON_UPDATE' => isset($match[8]) ? $match[9] : '' ); } </code></pre> <p>In the doc block it describes the resulting array as follows:</p> <pre><code> /** * The return value is an associative array keyed by the UPPERCASE foreign key, * as returned by the RDBMS. * * The value of each array element is an associative array * with the following keys: * * FK_NAME => string; original foreign key name * SCHEMA_NAME => string; name of database or schema * TABLE_NAME => string; * COLUMN_NAME => string; column name * REF_SCHEMA_NAME => string; name of reference database or schema * REF_TABLE_NAME => string; reference table name * REF_COLUMN_NAME => string; reference column name * ON_DELETE => string; action type on delete row * ON_UPDATE => string; action type on update row */ </code></pre> <p>I know it's not <b>exactly</b> what you were asking for since it's using the SHOW CREATE TABLE output, but based on my findings, it seems to be the generally accepted way of doing things.</p>
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