995 lines
24 KiB
PHP
995 lines
24 KiB
PHP
<?php
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/**
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* WordPress DB Class
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*
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* Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}
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*
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* @package WordPress
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* @subpackage Database
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* @since 0.71
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*/
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/**
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* @since 0.71
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*/
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define('EZSQL_VERSION', 'WP1.25');
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/**
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* @since 0.71
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*/
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define('OBJECT', 'OBJECT', true);
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/**
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* @since {@internal Version Unknown}}
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*/
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define('OBJECT_K', 'OBJECT_K', false);
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/**
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* @since 0.71
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*/
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define('ARRAY_A', 'ARRAY_A', false);
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/**
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* @since 0.71
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*/
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define('ARRAY_N', 'ARRAY_N', false);
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/**
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* WordPress Database Access Abstraction Object
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*
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* It is possible to replace this class with your own
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* by setting the $wpdb global variable in wp-content/db.php
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* file with your class. You can name it wpdb also, since
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* this file will not be included, if the other file is
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* available.
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*
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* @link http://codex.wordpress.org/Function_Reference/wpdb_Class
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*
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* @package WordPress
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* @subpackage Database
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* @since 0.71
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* @final
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*/
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class wpdb {
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/**
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* Whether to show SQL/DB errors
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*
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* @since 0.71
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* @access private
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* @var bool
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*/
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var $show_errors = false;
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/**
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* Whether to suppress errors during the DB bootstrapping.
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*
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* @access private
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* @since {@internal Version Unknown}}
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* @var bool
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*/
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var $suppress_errors = false;
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/**
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* The last error during query.
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*
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* @since {@internal Version Unknown}}
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* @var string
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*/
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var $last_error = '';
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/**
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* Amount of queries made
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*
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* @since 1.2.0
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* @access private
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* @var int
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*/
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var $num_queries = 0;
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/**
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* Saved result of the last query made
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*
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* @since 1.2.0
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* @access private
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* @var array
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*/
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var $last_query;
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/**
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* Saved info on the table column
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*
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* @since 1.2.0
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* @access private
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* @var array
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*/
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var $col_info;
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/**
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* Saved queries that were executed
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*
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* @since 1.5.0
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* @access private
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* @var array
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*/
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var $queries;
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/**
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* WordPress table prefix
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*
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* You can set this to have multiple WordPress installations
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* in a single database. The second reason is for possible
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* security precautions.
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*
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* @since 0.71
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* @access private
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* @var string
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*/
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var $prefix = '';
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/**
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* Whether the database queries are ready to start executing.
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*
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* @since 2.5.0
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* @access private
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* @var bool
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*/
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var $ready = false;
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/**
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* WordPress Posts table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $posts;
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/**
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* WordPress Users table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $users;
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/**
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* WordPress Categories table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $categories;
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/**
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* WordPress Post to Category table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $post2cat;
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/**
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* WordPress Comments table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $comments;
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/**
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* WordPress Links table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $links;
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/**
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* WordPress Options table
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*
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* @since 1.5.0
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* @access public
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* @var string
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*/
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var $options;
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/**
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* WordPress Post Metadata table
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*
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* @since {@internal Version Unknown}}
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* @access public
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* @var string
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*/
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var $postmeta;
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/**
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* WordPress User Metadata table
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*
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* @since 2.3.0
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* @access public
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* @var string
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*/
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var $usermeta;
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/**
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* WordPress Terms table
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*
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* @since 2.3.0
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* @access public
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* @var string
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*/
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var $terms;
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/**
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* WordPress Term Taxonomy table
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*
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* @since 2.3.0
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* @access public
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* @var string
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*/
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var $term_taxonomy;
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/**
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* WordPress Term Relationships table
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*
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* @since 2.3.0
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* @access public
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* @var string
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*/
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var $term_relationships;
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/**
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* List of WordPress tables
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*
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* @since {@internal Version Unknown}}
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* @access private
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* @var array
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*/
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var $tables = array('users', 'usermeta', 'posts', 'categories', 'post2cat', 'comments', 'links', 'link2cat', 'options',
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'postmeta', 'terms', 'term_taxonomy', 'term_relationships');
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/**
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* Database table columns charset
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*
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* @since 2.2.0
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* @access public
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* @var string
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*/
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var $charset;
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/**
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* Database table columns collate
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*
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* @since 2.2.0
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* @access public
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* @var string
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*/
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var $collate;
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/**
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* Connects to the database server and selects a database
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*
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* PHP4 compatibility layer for calling the PHP5 constructor.
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*
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* @uses wpdb::__construct() Passes parameters and returns result
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* @since 0.71
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*
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* @param string $dbuser MySQL database user
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* @param string $dbpassword MySQL database password
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* @param string $dbname MySQL database name
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* @param string $dbhost MySQL database host
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*/
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function wpdb($dbuser, $dbpassword, $dbname, $dbhost) {
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return $this->__construct($dbuser, $dbpassword, $dbname, $dbhost);
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}
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/**
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* Connects to the database server and selects a database
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*
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* PHP5 style constructor for compatibility with PHP5. Does
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* the actual setting up of the class properties and connection
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* to the database.
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*
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* @since 2.0.8
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*
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* @param string $dbuser MySQL database user
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* @param string $dbpassword MySQL database password
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* @param string $dbname MySQL database name
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* @param string $dbhost MySQL database host
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*/
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function __construct($dbuser, $dbpassword, $dbname, $dbhost) {
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register_shutdown_function(array(&$this, "__destruct"));
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if ( defined('WP_DEBUG') and WP_DEBUG == true )
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$this->show_errors();
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if ( defined('DB_CHARSET') )
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$this->charset = DB_CHARSET;
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if ( defined('DB_COLLATE') )
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$this->collate = DB_COLLATE;
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$this->dbh = @mysql_connect($dbhost, $dbuser, $dbpassword, true);
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if (!$this->dbh) {
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$this->bail(sprintf(/*WP_I18N_DB_CONN_ERROR*/"
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<h1>Error establishing a database connection</h1>
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<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>%s</code>. This could mean your host's database server is down.</p>
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<ul>
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<li>Are you sure you have the correct username and password?</li>
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<li>Are you sure that you have typed the correct hostname?</li>
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<li>Are you sure that the database server is running?</li>
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</ul>
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<p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
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"/*/WP_I18N_DB_CONN_ERROR*/, $dbhost));
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return;
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}
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$this->ready = true;
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if ( $this->has_cap( 'collation' ) ) {
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$collation_query = '';
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if ( !empty($this->charset) ) {
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$collation_query = "SET NAMES '{$this->charset}'";
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if (!empty($this->collate) )
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$collation_query .= " COLLATE '{$this->collate}'";
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}
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if ( !empty($collation_query) )
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$this->query($collation_query);
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}
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$this->select($dbname);
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}
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/**
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* PHP5 style destructor and will run when database object is destroyed.
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*
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* @since 2.0.8
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*
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* @return bool Always true
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*/
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function __destruct() {
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return true;
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}
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/**
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* Sets the table prefix for the WordPress tables.
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*
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* Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
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* override the WordPress users and usersmeta tables.
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*
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* @since 2.5.0
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*
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* @param string $prefix Alphanumeric name for the new prefix.
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* @return string Old prefix
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*/
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function set_prefix($prefix) {
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if ( preg_match('|[^a-z0-9_]|i', $prefix) )
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return new WP_Error('invalid_db_prefix', /*WP_I18N_DB_BAD_PREFIX*/'Invalid database prefix'/*/WP_I18N_DB_BAD_PREFIX*/);
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$old_prefix = $this->prefix;
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$this->prefix = $prefix;
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foreach ( (array) $this->tables as $table )
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$this->$table = $this->prefix . $table;
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if ( defined('CUSTOM_USER_TABLE') )
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$this->users = CUSTOM_USER_TABLE;
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if ( defined('CUSTOM_USER_META_TABLE') )
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$this->usermeta = CUSTOM_USER_META_TABLE;
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return $old_prefix;
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}
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/**
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* Selects a database using the current database connection.
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*
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* The database name will be changed based on the current database
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* connection. On failure, the execution will bail and display an DB error.
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*
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* @since 0.71
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*
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* @param string $db MySQL database name
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* @return null Always null.
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*/
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function select($db) {
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if (!@mysql_select_db($db, $this->dbh)) {
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$this->ready = false;
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$this->bail(sprintf(/*WP_I18N_DB_SELECT_DB*/'
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<h1>Can’t select database</h1>
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<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$s</code> database.</p>
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<ul>
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<li>Are you sure it exists?</li>
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<li>Does the user <code>%2$s</code> have permission to use the <code>%1$s</code> database?</li>
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<li>On some systems the name of your database is prefixed with your username, so it would be like username_wordpress. Could that be the problem?</li>
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</ul>
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<p>If you don\'t know how to setup a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="http://wordpress.org/support/">WordPress Support Forums</a>.</p>'/*/WP_I18N_DB_SELECT_DB*/, $db, DB_USER));
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return;
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}
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}
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/**
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* Escapes content for insertion into the database, for security
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*
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* @since 0.71
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*
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* @param string $string
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* @return string query safe string
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*/
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function escape($string) {
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return addslashes( $string );
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// Disable rest for now, causing problems
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/*
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if( !$this->dbh || version_compare( phpversion(), '4.3.0' ) == '-1' )
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return mysql_escape_string( $string );
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else
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return mysql_real_escape_string( $string, $this->dbh );
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*/
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}
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/**
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* Escapes content by reference for insertion into the database, for security
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*
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* @since 2.3.0
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*
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* @param string $s
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*/
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function escape_by_ref(&$s) {
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$s = $this->escape($s);
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}
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/**
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* Prepares a SQL query for safe use, using sprintf() syntax.
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*
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* @link http://php.net/sprintf See for syntax to use for query string.
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* @since 2.3.0
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*
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* @param null|string $args If string, first parameter must be query statement
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* @param mixed $args,... If additional parameters, they will be set inserted into the query.
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* @return null|string Sanitized query string
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*/
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function prepare($args=null) {
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if ( is_null( $args ) )
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return;
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$args = func_get_args();
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$query = array_shift($args);
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$query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
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$query = str_replace('"%s"', '%s', $query); // doublequote unquoting
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$query = str_replace('%s', "'%s'", $query); // quote the strings
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array_walk($args, array(&$this, 'escape_by_ref'));
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return @vsprintf($query, $args);
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}
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/**
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* Print SQL/DB error.
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*
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* @since 0.71
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* @global array $EZSQL_ERROR Stores error information of query and error string
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*
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* @param string $str The error to display
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* @return bool False if the showing of errors is disabled.
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*/
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function print_error($str = '') {
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global $EZSQL_ERROR;
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if (!$str) $str = mysql_error($this->dbh);
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$EZSQL_ERROR[] = array ('query' => $this->last_query, 'error_str' => $str);
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if ( $this->suppress_errors )
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return false;
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if ( $caller = $this->get_caller() )
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$error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR_FULL*/'WordPress database error %1$s for query %2$s made by %3$s'/*/WP_I18N_DB_QUERY_ERROR_FULL*/, $str, $this->last_query, $caller);
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else
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$error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR*/'WordPress database error %1$s for query %2$s'/*/WP_I18N_DB_QUERY_ERROR*/, $str, $this->last_query);
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$log_error = true;
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if ( ! function_exists('error_log') )
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$log_error = false;
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$log_file = @ini_get('error_log');
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if ( !empty($log_file) && ('syslog' != $log_file) && !@is_writable($log_file) )
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$log_error = false;
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if ( $log_error )
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@error_log($error_str, 0);
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// Is error output turned on or not..
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if ( !$this->show_errors )
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return false;
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$str = htmlspecialchars($str, ENT_QUOTES);
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$query = htmlspecialchars($this->last_query, ENT_QUOTES);
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// If there is an error then take note of it
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print "<div id='error'>
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<p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
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<code>$query</code></p>
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</div>";
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}
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/**
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* Enables showing of database errors.
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*
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* This function should be used only to enable showing of errors.
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* wpdb::hide_errors() should be used instead for hiding of errors. However,
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* this function can be used to enable and disable showing of database
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* errors.
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*
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* @since 0.71
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*
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* @param bool $show Whether to show or hide errors
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* @return bool Old value for showing errors.
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*/
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function show_errors( $show = true ) {
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$errors = $this->show_errors;
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$this->show_errors = $show;
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return $errors;
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}
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/**
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* Disables showing of database errors.
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*
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* @since 0.71
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*
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* @return bool Whether showing of errors was active or not
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*/
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function hide_errors() {
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$show = $this->show_errors;
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$this->show_errors = false;
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return $show;
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}
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/**
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* Whether to suppress database errors.
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*
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* @param unknown_type $suppress
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* @return unknown
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*/
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function suppress_errors( $suppress = true ) {
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$errors = $this->suppress_errors;
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$this->suppress_errors = $suppress;
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return $errors;
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}
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/**
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* Kill cached query results.
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*
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* @since 0.71
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*/
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function flush() {
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$this->last_result = array();
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$this->col_info = null;
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$this->last_query = null;
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}
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/**
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* Perform a MySQL database query, using current database connection.
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*
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* More information can be found on the codex page.
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|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string $query
|
|
* @return unknown
|
|
*/
|
|
function query($query) {
|
|
if ( ! $this->ready )
|
|
return false;
|
|
|
|
// filter the query, if filters are available
|
|
// NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
|
|
if ( function_exists('apply_filters') )
|
|
$query = apply_filters('query', $query);
|
|
|
|
// initialise return
|
|
$return_val = 0;
|
|
$this->flush();
|
|
|
|
// Log how the function was called
|
|
$this->func_call = "\$db->query(\"$query\")";
|
|
|
|
// Keep track of the last query for debug..
|
|
$this->last_query = $query;
|
|
|
|
// Perform the query via std mysql_query function..
|
|
if ( defined('SAVEQUERIES') && SAVEQUERIES )
|
|
$this->timer_start();
|
|
|
|
$this->result = @mysql_query($query, $this->dbh);
|
|
++$this->num_queries;
|
|
|
|
if ( defined('SAVEQUERIES') && SAVEQUERIES )
|
|
$this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
|
|
|
|
// If there is an error then take note of it..
|
|
if ( $this->last_error = mysql_error($this->dbh) ) {
|
|
$this->print_error();
|
|
return false;
|
|
}
|
|
|
|
if ( preg_match("/^\\s*(insert|delete|update|replace|alter) /i",$query) ) {
|
|
$this->rows_affected = mysql_affected_rows($this->dbh);
|
|
// Take note of the insert_id
|
|
if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
|
|
$this->insert_id = mysql_insert_id($this->dbh);
|
|
}
|
|
// Return number of rows affected
|
|
$return_val = $this->rows_affected;
|
|
} else {
|
|
$i = 0;
|
|
while ($i < @mysql_num_fields($this->result)) {
|
|
$this->col_info[$i] = @mysql_fetch_field($this->result);
|
|
$i++;
|
|
}
|
|
$num_rows = 0;
|
|
while ( $row = @mysql_fetch_object($this->result) ) {
|
|
$this->last_result[$num_rows] = $row;
|
|
$num_rows++;
|
|
}
|
|
|
|
@mysql_free_result($this->result);
|
|
|
|
// Log number of rows the query returned
|
|
$this->num_rows = $num_rows;
|
|
|
|
// Return number of rows selected
|
|
$return_val = $this->num_rows;
|
|
}
|
|
|
|
return $return_val;
|
|
}
|
|
|
|
/**
|
|
* Insert an array of data into a table.
|
|
*
|
|
* @since 2.5.0
|
|
*
|
|
* @param string $table WARNING: not sanitized!
|
|
* @param array $data Should not already be SQL-escaped
|
|
* @return mixed Results of $this->query()
|
|
*/
|
|
function insert($table, $data) {
|
|
$data = add_magic_quotes($data);
|
|
$fields = array_keys($data);
|
|
return $this->query("INSERT INTO $table (`" . implode('`,`',$fields) . "`) VALUES ('".implode("','",$data)."')");
|
|
}
|
|
|
|
/**
|
|
* Update a row in the table with an array of data.
|
|
*
|
|
* @since 2.5.0
|
|
*
|
|
* @param string $table WARNING: not sanitized!
|
|
* @param array $data Should not already be SQL-escaped
|
|
* @param array $where A named array of WHERE column => value relationships. Multiple member pairs will be joined with ANDs. WARNING: the column names are not currently sanitized!
|
|
* @return mixed Results of $this->query()
|
|
*/
|
|
function update($table, $data, $where){
|
|
$data = add_magic_quotes($data);
|
|
$bits = $wheres = array();
|
|
foreach ( (array) array_keys($data) as $k )
|
|
$bits[] = "`$k` = '$data[$k]'";
|
|
|
|
if ( is_array( $where ) )
|
|
foreach ( $where as $c => $v )
|
|
$wheres[] = "$c = '" . $this->escape( $v ) . "'";
|
|
else
|
|
return false;
|
|
|
|
return $this->query( "UPDATE $table SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres ) );
|
|
}
|
|
|
|
/**
|
|
* Retrieve one variable from the database.
|
|
*
|
|
* This combines the functionality of wpdb::get_row() and wpdb::get_col(),
|
|
* so both the column and row can be picked.
|
|
*
|
|
* It is possible to use this function without executing more queries. If
|
|
* you already made a query, you can set the $query to 'null' value and just
|
|
* retrieve either the column and row of the last query result.
|
|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string $query Can be null as well, for caching
|
|
* @param int $x Column num to return
|
|
* @param int $y Row num to return
|
|
* @return mixed Database query results
|
|
*/
|
|
function get_var($query=null, $x = 0, $y = 0) {
|
|
$this->func_call = "\$db->get_var(\"$query\",$x,$y)";
|
|
if ( $query )
|
|
$this->query($query);
|
|
|
|
// Extract var out of cached results based x,y vals
|
|
if ( !empty( $this->last_result[$y] ) ) {
|
|
$values = array_values(get_object_vars($this->last_result[$y]));
|
|
}
|
|
|
|
// If there is a value return it else return null
|
|
return (isset($values[$x]) && $values[$x]!=='') ? $values[$x] : null;
|
|
}
|
|
|
|
/**
|
|
* Retrieve one row from the database.
|
|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string $query SQL query
|
|
* @param string $output ARRAY_A | ARRAY_N | OBJECT
|
|
* @param int $y Row num to return
|
|
* @return mixed Database query results
|
|
*/
|
|
function get_row($query = null, $output = OBJECT, $y = 0) {
|
|
$this->func_call = "\$db->get_row(\"$query\",$output,$y)";
|
|
if ( $query )
|
|
$this->query($query);
|
|
else
|
|
return null;
|
|
|
|
if ( !isset($this->last_result[$y]) )
|
|
return null;
|
|
|
|
if ( $output == OBJECT ) {
|
|
return $this->last_result[$y] ? $this->last_result[$y] : null;
|
|
} elseif ( $output == ARRAY_A ) {
|
|
return $this->last_result[$y] ? get_object_vars($this->last_result[$y]) : null;
|
|
} elseif ( $output == ARRAY_N ) {
|
|
return $this->last_result[$y] ? array_values(get_object_vars($this->last_result[$y])) : null;
|
|
} else {
|
|
$this->print_error(/*WP_I18N_DB_GETROW_ERROR*/" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N"/*/WP_I18N_DB_GETROW_ERROR*/);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieve one column from the database.
|
|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string $query Can be null as well, for caching
|
|
* @param int $x Col num to return. Starts from 0.
|
|
* @return array Column results
|
|
*/
|
|
function get_col($query = null , $x = 0) {
|
|
if ( $query )
|
|
$this->query($query);
|
|
|
|
$new_array = array();
|
|
// Extract the column values
|
|
for ( $i=0; $i < count($this->last_result); $i++ ) {
|
|
$new_array[$i] = $this->get_var(null, $x, $i);
|
|
}
|
|
return $new_array;
|
|
}
|
|
|
|
/**
|
|
* Retrieve an entire result set from the database.
|
|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string|null $query Can also be null to pull from the cache
|
|
* @param string $output ARRAY_A | ARRAY_N | OBJECT_K | OBJECT
|
|
* @return mixed Database query results
|
|
*/
|
|
function get_results($query = null, $output = OBJECT) {
|
|
$this->func_call = "\$db->get_results(\"$query\", $output)";
|
|
|
|
if ( $query )
|
|
$this->query($query);
|
|
else
|
|
return null;
|
|
|
|
if ( $output == OBJECT ) {
|
|
// Return an integer-keyed array of row objects
|
|
return $this->last_result;
|
|
} elseif ( $output == OBJECT_K ) {
|
|
// Return an array of row objects with keys from column 1
|
|
// (Duplicates are discarded)
|
|
foreach ( $this->last_result as $row ) {
|
|
$key = array_shift( get_object_vars( $row ) );
|
|
if ( !isset( $new_array[ $key ] ) )
|
|
$new_array[ $key ] = $row;
|
|
}
|
|
return $new_array;
|
|
} elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
|
|
// Return an integer-keyed array of...
|
|
if ( $this->last_result ) {
|
|
$i = 0;
|
|
foreach( (array) $this->last_result as $row ) {
|
|
if ( $output == ARRAY_N ) {
|
|
// ...integer-keyed row arrays
|
|
$new_array[$i] = array_values( get_object_vars( $row ) );
|
|
} else {
|
|
// ...column name-keyed row arrays
|
|
$new_array[$i] = get_object_vars( $row );
|
|
}
|
|
++$i;
|
|
}
|
|
return $new_array;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieve column metadata from the last query.
|
|
*
|
|
* @since 0.71
|
|
*
|
|
* @param string $info_type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
|
|
* @param int $col_offset 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
|
|
* @return mixed Column Results
|
|
*/
|
|
function get_col_info($info_type = 'name', $col_offset = -1) {
|
|
if ( $this->col_info ) {
|
|
if ( $col_offset == -1 ) {
|
|
$i = 0;
|
|
foreach( (array) $this->col_info as $col ) {
|
|
$new_array[$i] = $col->{$info_type};
|
|
$i++;
|
|
}
|
|
return $new_array;
|
|
} else {
|
|
return $this->col_info[$col_offset]->{$info_type};
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Starts the timer, for debugging purposes.
|
|
*
|
|
* @since 1.5.0
|
|
*
|
|
* @return bool Always returns true
|
|
*/
|
|
function timer_start() {
|
|
$mtime = microtime();
|
|
$mtime = explode(' ', $mtime);
|
|
$this->time_start = $mtime[1] + $mtime[0];
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Stops the debugging timer.
|
|
*
|
|
* @since 1.5.0
|
|
*
|
|
* @return int Total time spent on the query, in milliseconds
|
|
*/
|
|
function timer_stop() {
|
|
$mtime = microtime();
|
|
$mtime = explode(' ', $mtime);
|
|
$time_end = $mtime[1] + $mtime[0];
|
|
$time_total = $time_end - $this->time_start;
|
|
return $time_total;
|
|
}
|
|
|
|
/**
|
|
* Wraps fatal errors in a nice header and footer and dies.
|
|
*
|
|
* @since 1.5.0
|
|
*
|
|
* @param string $message
|
|
* @return unknown
|
|
*/
|
|
function bail($message) {
|
|
if ( !$this->show_errors ) {
|
|
if ( class_exists('WP_Error') )
|
|
$this->error = new WP_Error('500', $message);
|
|
else
|
|
$this->error = $message;
|
|
return false;
|
|
}
|
|
wp_die($message);
|
|
}
|
|
|
|
/**
|
|
* Whether or not MySQL database is minimal required version.
|
|
*
|
|
* @since 2.5.0
|
|
* @uses $wp_version
|
|
*
|
|
* @return WP_Error
|
|
*/
|
|
function check_database_version()
|
|
{
|
|
global $wp_version;
|
|
// Make sure the server has MySQL 4.0
|
|
if ( version_compare($this->db_version(), '4.0.0', '<') )
|
|
return new WP_Error('database_version',sprintf(__('<strong>ERROR</strong>: WordPress %s requires MySQL 4.0.0 or higher'), $wp_version));
|
|
}
|
|
|
|
/**
|
|
* Whether of not the database version supports collation.
|
|
*
|
|
* Called when WordPress is generating the table scheme.
|
|
*
|
|
* @since 2.5.0
|
|
*
|
|
* @return bool True if collation is supported, false if version does not
|
|
*/
|
|
function supports_collation()
|
|
{
|
|
return $this->has_cap( 'collation' );
|
|
}
|
|
|
|
/**
|
|
* Generic function to determine if a database supports a particular feature
|
|
* @param string $db_cap the feature
|
|
* @param false|string|resource $dbh_or_table the databaese (the current database, the database housing the specified table, or the database of the mysql resource)
|
|
* @return bool
|
|
*/
|
|
function has_cap( $db_cap ) {
|
|
$version = $this->db_version();
|
|
|
|
switch ( strtolower( $db_cap ) ) :
|
|
case 'collation' : // @since 2.5.0
|
|
case 'group_concat' : // @since 2.7
|
|
case 'subqueries' : // @since 2.7
|
|
return version_compare($version, '4.1', '>=');
|
|
break;
|
|
endswitch;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Retrieve the name of the function that called wpdb.
|
|
*
|
|
* Requires PHP 4.3 and searches up the list of functions until it reaches
|
|
* the one that would most logically had called this method.
|
|
*
|
|
* @since 2.5.0
|
|
*
|
|
* @return string The name of the calling function
|
|
*/
|
|
function get_caller() {
|
|
// requires PHP 4.3+
|
|
if ( !is_callable('debug_backtrace') )
|
|
return '';
|
|
|
|
$bt = debug_backtrace();
|
|
$caller = array();
|
|
|
|
$bt = array_reverse( $bt );
|
|
foreach ( (array) $bt as $call ) {
|
|
if ( @$call['class'] == __CLASS__ )
|
|
continue;
|
|
$function = $call['function'];
|
|
if ( isset( $call['class'] ) )
|
|
$function = $call['class'] . "->$function";
|
|
$caller[] = $function;
|
|
}
|
|
$caller = join( ', ', $caller );
|
|
|
|
return $caller;
|
|
}
|
|
|
|
/**
|
|
* The database version number
|
|
* @return false|string false on failure, version number on success
|
|
*/
|
|
function db_version() {
|
|
return preg_replace('/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ));
|
|
}
|
|
}
|
|
|
|
if ( ! isset($wpdb) ) {
|
|
/**
|
|
* WordPress Database Object, if it isn't set already in wp-content/db.php
|
|
* @global object $wpdb Creates a new wpdb object based on wp-config.php Constants for the database
|
|
* @since 0.71
|
|
*/
|
|
$wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
|
|
}
|
|
?>
|