414 行
无行尾
9.6 KiB
PHP
414 行
无行尾
9.6 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* Code Igniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Database Utility Class
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*
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_utility extends CI_DB_forge {
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var $db;
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var $data_cache = array();
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/**
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* Constructor
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*
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* Grabs the CI super object instance so we can access it.
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*
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*/
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function CI_DB_utility()
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{
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// Assign the main database object to $this->db
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$CI =& get_instance();
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$this->db =& $CI->db;
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log_message('debug', "Database Utility Class Initialized");
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}
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// --------------------------------------------------------------------
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/**
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* List databases
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*
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* @access public
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* @return bool
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*/
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function list_databases()
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{
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// Is there a cached result?
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if (isset($this->data_cache['db_names']))
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{
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return $this->data_cache['db_names'];
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}
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$query = $this->db->query($this->_list_databases());
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$dbs = array();
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if ($query->num_rows() > 0)
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{
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foreach ($query->result_array() as $row)
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{
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$dbs[] = current($row);
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}
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}
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$this->data_cache['db_names'] = $dbs;
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return $this->data_cache['db_names'];
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}
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// --------------------------------------------------------------------
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/**
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* Determine if a particular database exists
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*
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* @access public
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* @param string
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* @return boolean
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*/
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function database_exists($database_name)
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{
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// Some databases won't have access to the list_databases() function, so
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// this is intended to allow them to override with their own functions as
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// defined in $driver_utility.php
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if (method_exists($this, '_database_exists'))
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{
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return $this->_database_exists($database_name);
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}
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else
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{
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return ( ! in_array($database_name, $this->list_databases())) ? FALSE : TRUE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Optimize Table
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*
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* @access public
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* @param string the table name
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* @return bool
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*/
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function optimize_table($table_name)
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{
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$sql = $this->_optimize_table($table_name);
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if (is_bool($sql))
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{
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show_error('db_must_use_set');
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}
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$query = $this->db->query($sql);
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$res = $query->result_array();
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// Note: Due to a bug in current() that affects some versions
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// of PHP we can not pass function call directly into it
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return current($res);
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}
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// --------------------------------------------------------------------
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/**
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* Optimize Database
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*
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* @access public
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* @return array
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*/
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function optimize_database()
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{
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$result = array();
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foreach ($this->db->list_tables() as $table_name)
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{
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$sql = $this->_optimize_table($table_name);
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if (is_bool($sql))
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{
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return $sql;
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}
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$query = $this->db->query($sql);
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// Build the result array...
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// Note: Due to a bug in current() that affects some versions
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// of PHP we can not pass function call directly into it
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$res = $query->result_array();
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$res = current($res);
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$key = str_replace($this->db->database.'.', '', current($res));
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$keys = array_keys($res);
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unset($res[$keys[0]]);
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$result[$key] = $res;
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}
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return $result;
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}
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// --------------------------------------------------------------------
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/**
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* Repair Table
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*
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* @access public
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* @param string the table name
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* @return bool
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*/
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function repair_table($table_name)
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{
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$sql = $this->_repair_table($table_name);
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if (is_bool($sql))
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{
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return $sql;
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}
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$query = $this->db->query($sql);
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// Note: Due to a bug in current() that affects some versions
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// of PHP we can not pass function call directly into it
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$res = $query->result_array();
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return current($res);
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}
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// --------------------------------------------------------------------
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/**
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* Generate CSV from a query result object
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*
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* @access public
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* @param object The query result object
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* @param string The delimiter - comma by default
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* @param string The newline character - \n by default
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* @param string The enclosure - double quote by default
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* @return string
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*/
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function csv_from_result($query, $delim = ",", $newline = "\n", $enclosure = '"')
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{
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if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
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{
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show_error('You must submit a valid result object');
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}
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$out = '';
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// First generate the headings from the table column names
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foreach ($query->list_fields() as $name)
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{
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$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim;
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}
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$out = rtrim($out);
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$out .= $newline;
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// Next blast through the result array and build out the rows
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foreach ($query->result_array() as $row)
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{
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foreach ($row as $item)
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{
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$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $item).$enclosure.$delim;
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}
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$out = rtrim($out);
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$out .= $newline;
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}
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return $out;
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}
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// --------------------------------------------------------------------
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/**
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* Generate XML data from a query result object
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*
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* @access public
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* @param object The query result object
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* @param array Any preferences
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* @return string
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*/
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function xml_from_result($query, $params = array())
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{
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if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
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{
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show_error('You must submit a valid result object');
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}
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// Set our default values
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foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val)
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{
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if ( ! isset($params[$key]))
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{
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$params[$key] = $val;
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}
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}
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// Create variables for convenience
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extract($params);
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// Load the xml helper
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$CI =& get_instance();
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$CI->load->helper('xml');
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// Generate the result
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$xml = "<{$root}>".$newline;
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foreach ($query->result_array() as $row)
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{
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$xml .= $tab."<{$element}>".$newline;
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foreach ($row as $key => $val)
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{
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$xml .= $tab.$tab."<{$key}>".xml_convert($val)."</{$key}>".$newline;
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}
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$xml .= $tab."</{$element}>".$newline;
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}
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$xml .= "</$root>".$newline;
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return $xml;
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}
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// --------------------------------------------------------------------
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/**
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* Database Backup
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*
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* @access public
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* @return void
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*/
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function backup($params = array())
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{
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// If the parameters have not been submitted as an
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// array then we know that it is simply the table
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// name, which is a valid short cut.
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if (is_string($params))
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{
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$params = array('tables' => $params);
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}
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// ------------------------------------------------------
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// Set up our default preferences
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$prefs = array(
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'tables' => array(),
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'ignore' => array(),
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'filename' => '',
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'format' => 'gzip', // gzip, zip, txt
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'add_drop' => TRUE,
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'add_insert' => TRUE,
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'newline' => "\n"
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);
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// Did the user submit any preferences? If so set them....
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if (count($params) > 0)
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{
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foreach ($prefs as $key => $val)
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{
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if (isset($params[$key]))
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{
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$prefs[$key] = $params[$key];
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}
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}
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}
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// ------------------------------------------------------
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// Are we backing up a complete database or individual tables?
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// If no table names were submitted we'll fetch the entire table list
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if (count($prefs['tables']) == 0)
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{
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$prefs['tables'] = $this->db->list_tables();
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}
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// ------------------------------------------------------
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// Validate the format
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if ( ! in_array($prefs['format'], array('gzip', 'zip', 'txt'), TRUE))
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{
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$prefs['format'] = 'txt';
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}
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// ------------------------------------------------------
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// Is the encoder supported? If not, we'll either issue an
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// error or use plain text depending on the debug settings
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if (($prefs['format'] == 'gzip' AND ! @function_exists('gzencode'))
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OR ($prefs['format'] == 'zip' AND ! @function_exists('gzcompress')))
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{
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if ($this->db->db_debug)
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{
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return $this->db->display_error('db_unsuported_compression');
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}
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$prefs['format'] = 'txt';
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}
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// ------------------------------------------------------
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// Set the filename if not provided - Only needed with Zip files
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if ($prefs['filename'] == '' AND $prefs['format'] == 'zip')
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{
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$prefs['filename'] = (count($prefs['tables']) == 1) ? $prefs['tables'] : $this->db->database;
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$prefs['filename'] .= '_'.date('Y-m-d_H-i', time());
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}
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// ------------------------------------------------------
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// Was a Gzip file requested?
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if ($prefs['format'] == 'gzip')
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{
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return gzencode($this->_backup($prefs));
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}
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// ------------------------------------------------------
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// Was a text file requested?
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if ($prefs['format'] == 'txt')
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{
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return $this->_backup($prefs);
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}
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// ------------------------------------------------------
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// Was a Zip file requested?
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if ($prefs['format'] == 'zip')
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{
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// If they included the .zip file extension we'll remove it
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if (preg_match("|.+?\.zip$|", $prefs['filename']))
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{
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$prefs['filename'] = str_replace('.zip', '', $prefs['filename']);
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}
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// Tack on the ".sql" file extension if needed
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if ( ! preg_match("|.+?\.sql$|", $prefs['filename']))
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{
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$prefs['filename'] .= '.sql';
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}
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// Load the Zip class and output it
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$CI =& get_instance();
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$CI->load->library('zip');
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$CI->zip->add_data($prefs['filename'], $this->_backup($prefs));
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return $CI->zip->get_zip();
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}
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}
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}
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/* End of file DB_utility.php */
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/* Location: ./system/database/DB_utility.php */ |