Db.php

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<?php
#require_once 'Zend/Log/Writer/Abstract.php';

class Zend_Log_Writer_Db extends Zend_Log_Writer_Abstract
{
    protected $_db;

    protected $_table;

    protected $_columnMap;

    public function __construct($db, $table, $columnMap = null)
    {
        $this->_db    = $db;
        $this->_table = $table;
        $this->_columnMap = $columnMap;
    }

    static public function factory($config)
    {
        $config = self::_parseConfig($config);
        $config = array_merge(array(
            'db'        => null,
            'table'     => null,
            'columnMap' => null,
        ), $config);

        if (isset($config['columnmap'])) {
            $config['columnMap'] = $config['columnmap'];
        }

        return new self(
            $config['db'],
            $config['table'],
            $config['columnMap']
        );
    }

    public function setFormatter(Zend_Log_Formatter_Interface $formatter)
    {
        #require_once 'Zend/Log/Exception.php';
        throw new Zend_Log_Exception(get_class($this) . ' does not support formatting');
    }

    public function shutdown()
    {
        $this->_db = null;
    }

    protected function _write($event)
    {
        if ($this->_db === null) {
            #require_once 'Zend/Log/Exception.php';
            throw new Zend_Log_Exception('Database adapter is null');
        }

        if ($this->_columnMap === null) {
            $dataToInsert = $event;
        } else {
            $dataToInsert = array();
            foreach ($this->_columnMap as $columnName => $fieldKey) {
                if (isset($event[$fieldKey])) {
                    $dataToInsert[$columnName] = $event[$fieldKey];
                }
            }
        }

        $this->_db->insert($this->_table, $dataToInsert);
    }
}