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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008, EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * MySQL Utility Class
 *
 * @category    Database
 * @author              ExpressionEngine Dev Team
 * @link                http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {

        /**
         * List databases
         *
         * @access      private
         * @return      bool
         */
        function _list_databases()
        {
                return "SHOW DATABASES";
        }

        // --------------------------------------------------------------------

        /**
         * Optimize table query
         *
         * Generates a platform-specific query so that a table can be optimized
         *
         * @access      private
         * @param       string  the table name
         * @return      object
         */
        function _optimize_table($table)
        {
                return "OPTIMIZE TABLE ".$this->db->_escape_identifiers($table);
        }

        // --------------------------------------------------------------------

        /**
         * Repair table query
         *
         * Generates a platform-specific query so that a table can be repaired
         *
         * @access      private
         * @param       string  the table name
         * @return      object
         */
        function _repair_table($table)
        {
                return "REPAIR TABLE ".$this->db->_escape_identifiers($table);
        }

        // --------------------------------------------------------------------
        /**
         * MySQL Export
         *
         * @access      private
         * @param       array   Preferences
         * @return      mixed
         */
        function _backup($params = array())
        {
                if (count($params) == 0)
                {
                        return FALSE;
                }

                // Extract the prefs for simplicity
                extract($params);
        
                // Build the output
                $output = '';
                foreach ((array)$tables as $table)
                {
                        // Is the table in the "ignore" list?
                        if (in_array($table, (array)$ignore, TRUE))
                        {
                                continue;
                        }

                        // Get the table schema
                        $query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.'.$table);
                        
                        // No result means the table name was invalid
                        if ($query === FALSE)
                        {
                                continue;
                        }
                        
                        // Write out the table schema
                        $output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;

                        if ($add_drop == TRUE)
                        {
                                $output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
                        }
                        
                        $i = 0;
                        $result = $query->result_array();
                        foreach ($result[0] as $val)
                        {
                                if ($i++ % 2)
                                {                                       
                                        $output .= $val.';'.$newline.$newline;
                                }
                        }
                        
                        // If inserts are not needed we're done...
                        if ($add_insert == FALSE)
                        {
                                continue;
                        }

                        // Grab all the data from the current table
                        $query = $this->db->query("SELECT * FROM $table");
                        
                        if ($query->num_rows() == 0)
                        {
                                continue;
                        }
                
                        // Fetch the field names and determine if the field is an
                        // integer type.  We use this info to decide whether to
                        // surround the data with quotes or not
                        
                        $i = 0;
                        $field_str = '';
                        $is_int = array();
                        while ($field = mysql_fetch_field($query->result_id))
                        {
                                // Most versions of MySQL store timestamp as a string
                                $is_int[$i] = (in_array(
                                                                                strtolower(mysql_field_type($query->result_id, $i)),
                                                                                array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'), 
                                                                                TRUE)
                                                                                ) ? TRUE : FALSE;
                                                                                
                                // Create a string of field names
                                $field_str .= '`'.$field->name.'`, ';
                                $i++;
                        }
                        
                        // Trim off the end comma
                        $field_str = preg_replace( "/, $/" , "" , $field_str);
                        
                        
                        // Build the insert string
                        foreach ($query->result_array() as $row)
                        {
                                $val_str = '';
                        
                                $i = 0;
                                foreach ($row as $v)
                                {
                                        // Is the value NULL?
                                        if ($v === NULL)
                                        {
                                                $val_str .= 'NULL';
                                        }
                                        else
                                        {
                                                // Escape the data if it's not an integer
                                                if ($is_int[$i] == FALSE)
                                                {
                                                        $val_str .= $this->db->escape($v);
                                                }
                                                else
                                                {
                                                        $val_str .= $v;
                                                }                                       
                                        }                                       
                                        
                                        // Append a comma
                                        $val_str .= ', ';
                                        $i++;
                                }
                                
                                // Remove the comma at the end of the string
                                $val_str = preg_replace( "/, $/" , "" , $val_str);
                                                                
                                // Build the INSERT string
                                $output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
                        }
                        
                        $output .= $newline.$newline;
                }

                return $output;
        }

        /**
         *
         * The functions below have been deprecated as of 1.6, and are only here for backwards
         * compatibility.  They now reside in dbforge().  The use of dbutils for database manipulation
         * is STRONGLY discouraged in favour if using dbforge.
         *
         */

        /**
         * Create database
         *
         * @access      private
         * @param       string  the database name
         * @return      bool
         */
        function _create_database($name)
        {
                return "CREATE DATABASE ".$name;
        }

        // --------------------------------------------------------------------

        /**
         * Drop database
         *
         * @access      private
         * @param       string  the database name
         * @return      bool
         */
        function _drop_database($name)
        {
                return "DROP DATABASE ".$name;
        }

}

/* End of file mysql_utility.php */
/* Location: ./system/database/drivers/mysql/mysql_utility.php */