www.gusucode.com > PHP开源客户管理系统 v1.0PHP源码程序 > PHP开源客户管理系统 v1.0/khglxt_A5/khglxt_A5/system/database/DB_utility.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Database Utility Class
*
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_utility extends CI_DB_forge {
var $db;
var $data_cache = array();
/**
* Constructor
*
* Grabs the CI super object instance so we can access it.
*
*/
function __construct()
{
// Assign the main database object to $this->db
$CI =& get_instance();
$this->db =& $CI->db;
log_message('debug', "Database Utility Class Initialized");
}
// --------------------------------------------------------------------
/**
* List databases
*
* @access public
* @return bool
*/
function list_databases()
{
// Is there a cached result?
if (isset($this->data_cache['db_names']))
{
return $this->data_cache['db_names'];
}
$query = $this->db->query($this->_list_databases());
$dbs = array();
if ($query->num_rows() > 0)
{
foreach ($query->result_array() as $row)
{
$dbs[] = current($row);
}
}
$this->data_cache['db_names'] = $dbs;
return $this->data_cache['db_names'];
}
// --------------------------------------------------------------------
/**
* Determine if a particular database exists
*
* @access public
* @param string
* @return boolean
*/
function database_exists($database_name)
{
// Some databases won't have access to the list_databases() function, so
// this is intended to allow them to override with their own functions as
// defined in $driver_utility.php
if (method_exists($this, '_database_exists'))
{
return $this->_database_exists($database_name);
}
else
{
return ( ! in_array($database_name, $this->list_databases())) ? FALSE : TRUE;
}
}
// --------------------------------------------------------------------
/**
* Optimize Table
*
* @access public
* @param string the table name
* @return bool
*/
function optimize_table($table_name)
{
$sql = $this->_optimize_table($table_name);
if (is_bool($sql))
{
show_error('db_must_use_set');
}
$query = $this->db->query($sql);
$res = $query->result_array();
// Note: Due to a bug in current() that affects some versions
// of PHP we can not pass function call directly into it
return current($res);
}
// --------------------------------------------------------------------
/**
* Optimize Database
*
* @access public
* @return array
*/
function optimize_database()
{
$result = array();
foreach ($this->db->list_tables() as $table_name)
{
$sql = $this->_optimize_table($table_name);
if (is_bool($sql))
{
return $sql;
}
$query = $this->db->query($sql);
// Build the result array...
// Note: Due to a bug in current() that affects some versions
// of PHP we can not pass function call directly into it
$res = $query->result_array();
$res = current($res);
$key = str_replace($this->db->database.'.', '', current($res));
$keys = array_keys($res);
unset($res[$keys[0]]);
$result[$key] = $res;
}
return $result;
}
// --------------------------------------------------------------------
/**
* Repair Table
*
* @access public
* @param string the table name
* @return bool
*/
function repair_table($table_name)
{
$sql = $this->_repair_table($table_name);
if (is_bool($sql))
{
return $sql;
}
$query = $this->db->query($sql);
// Note: Due to a bug in current() that affects some versions
// of PHP we can not pass function call directly into it
$res = $query->result_array();
return current($res);
}
// --------------------------------------------------------------------
/**
* Generate CSV from a query result object
*
* @access public
* @param object The query result object
* @param string The delimiter - comma by default
* @param string The newline character - \n by default
* @param string The enclosure - double quote by default
* @return string
*/
function csv_from_result($query, $delim = ",", $newline = "\n", $enclosure = '"')
{
if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
{
show_error('You must submit a valid result object');
}
$out = '';
// First generate the headings from the table column names
foreach ($query->list_fields() as $name)
{
$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim;
}
$out = rtrim($out);
$out .= $newline;
// Next blast through the result array and build out the rows
foreach ($query->result_array() as $row)
{
foreach ($row as $item)
{
$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $item).$enclosure.$delim;
}
$out = rtrim($out);
$out .= $newline;
}
return $out;
}
// --------------------------------------------------------------------
/**
* Generate XML data from a query result object
*
* @access public
* @param object The query result object
* @param array Any preferences
* @return string
*/
function xml_from_result($query, $params = array())
{
if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
{
show_error('You must submit a valid result object');
}
// Set our default values
foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val)
{
if ( ! isset($params[$key]))
{
$params[$key] = $val;
}
}
// Create variables for convenience
extract($params);
// Load the xml helper
$CI =& get_instance();
$CI->load->helper('xml');
// Generate the result
$xml = "<{$root}>".$newline;
foreach ($query->result_array() as $row)
{
$xml .= $tab."<{$element}>".$newline;
foreach ($row as $key => $val)
{
$xml .= $tab.$tab."<{$key}>".xml_convert($val)."</{$key}>".$newline;
}
$xml .= $tab."</{$element}>".$newline;
}
$xml .= "</$root>".$newline;
return $xml;
}
// --------------------------------------------------------------------
/**
* Database Backup
*
* @access public
* @return void
*/
function backup($params = array())
{
// If the parameters have not been submitted as an
// array then we know that it is simply the table
// name, which is a valid short cut.
if (is_string($params))
{
$params = array('tables' => $params);
}
// ------------------------------------------------------
// Set up our default preferences
$prefs = array(
'tables' => array(),
'ignore' => array(),
'filename' => '',
'format' => 'gzip', // gzip, zip, txt
'add_drop' => TRUE,
'add_insert' => TRUE,
'newline' => "\n"
);
// Did the user submit any preferences? If so set them....
if (count($params) > 0)
{
foreach ($prefs as $key => $val)
{
if (isset($params[$key]))
{
$prefs[$key] = $params[$key];
}
}
}
// ------------------------------------------------------
// Are we backing up a complete database or individual tables?
// If no table names were submitted we'll fetch the entire table list
if (count($prefs['tables']) == 0)
{
$prefs['tables'] = $this->db->list_tables();
}
// ------------------------------------------------------
// Validate the format
if ( ! in_array($prefs['format'], array('gzip', 'zip', 'txt'), TRUE))
{
$prefs['format'] = 'txt';
}
// ------------------------------------------------------
// Is the encoder supported? If not, we'll either issue an
// error or use plain text depending on the debug settings
if (($prefs['format'] == 'gzip' AND ! @function_exists('gzencode'))
OR ($prefs['format'] == 'zip' AND ! @function_exists('gzcompress')))
{
if ($this->db->db_debug)
{
return $this->db->display_error('db_unsuported_compression');
}
$prefs['format'] = 'txt';
}
// ------------------------------------------------------
// Set the filename if not provided - Only needed with Zip files
if ($prefs['filename'] == '' AND $prefs['format'] == 'zip')
{
$prefs['filename'] = (count($prefs['tables']) == 1) ? $prefs['tables'] : $this->db->database;
$prefs['filename'] .= '_'.date('Y-m-d_H-i', time());
}
// ------------------------------------------------------
// Was a Gzip file requested?
if ($prefs['format'] == 'gzip')
{
return gzencode($this->_backup($prefs));
}
// ------------------------------------------------------
// Was a text file requested?
if ($prefs['format'] == 'txt')
{
return $this->_backup($prefs);
}
// ------------------------------------------------------
// Was a Zip file requested?
if ($prefs['format'] == 'zip')
{
// If they included the .zip file extension we'll remove it
if (preg_match("|.+?\.zip$|", $prefs['filename']))
{
$prefs['filename'] = str_replace('.zip', '', $prefs['filename']);
}
// Tack on the ".sql" file extension if needed
if ( ! preg_match("|.+?\.sql$|", $prefs['filename']))
{
$prefs['filename'] .= '.sql';
}
// Load the Zip class and output it
$CI =& get_instance();
$CI->load->library('zip');
$CI->zip->add_data($prefs['filename'], $this->_backup($prefs));
return $CI->zip->get_zip();
}
}
}
/* End of file DB_utility.php */
/* Location: ./system/database/DB_utility.php */