root/tags/2.0/wp-includes/wp-db.php

<?php
//  WordPress DB Class

//  ORIGINAL CODE FROM:
//  Justin Vincent (justin@visunet.ie)
//    http://php.justinvincent.com

define('EZSQL_VERSION', 'WP1.25');
define('OBJECT', 'OBJECT', true);
define('ARRAY_A', 'ARRAY_A', false);
define('ARRAY_N', 'ARRAY_N', false);

if (!defined('SAVEQUERIES'))
    define('SAVEQUERIES', false);

class wpdb {

    var $show_errors = true;
    var $num_queries = 0;    
    var $last_query;
    var $col_info;
    var $queries;

    // Our tables
    var $posts;
    var $users;
    var $categories;
    var $post2cat;
    var $comments;
    var $links;
    var $linkcategories;
    var $options;
    var $optiontypes;
    var $optionvalues;
    var $optiongroups;
    var $optiongroup_options;
    var $postmeta;

    // ==================================================================
    //    DB Constructor - connects to the server and selects a database

    function wpdb($dbuser, $dbpassword, $dbname, $dbhost) {
        $this->dbh = @mysql_connect($dbhost, $dbuser, $dbpassword);
        if (!$this->dbh) {
            $this->bail("
<h1>Error establishing a database connection</h1>
<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>$dbhost</code>. This could mean your host's database server is down.</p>
<ul>
    <li>Are you sure you have the correct username and password?</li>
    <li>Are you sure that you have typed the correct hostname?</li>
    <li>Are you sure that the database server is running?</li>
</ul>
<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>
");
        }

        $this->select($dbname);
    }

    // ==================================================================
    //    Select a DB (if another one needs to be selected)

    function select($db) {
        if (!@mysql_select_db($db, $this->dbh)) {
            $this->bail("
<h1>Can&#8217;t select database</h1>
<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>$db</code> database.</p>
<ul>
<li>Are you sure it exists?</li>
<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>
</ul>
<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>");
        }
    }

    // ====================================================================
    //    Format a string correctly for safe insert under all PHP conditions
    
    function escape($string) {
        return addslashes( $string ); // Disable rest for now, causing problems
        if( !$this->dbh || version_compare( phpversion(), '4.3.0' ) == '-1' )
            return mysql_escape_string( $string );
        else
            return mysql_real_escape_string( $string, $this->dbh );
    }

    // ==================================================================
    //    Print SQL/DB error.

    function print_error($str = '') {
        global $EZSQL_ERROR;
        if (!$str) $str = mysql_error();
        $EZSQL_ERROR[] = 
        array ('query' => $this->last_query, 'error_str' => $str);

        // Is error output turned on or not..
        if ( $this->show_errors ) {
            // If there is an error then take note of it
            print "<div id='error'>
            <p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
            <code>$this->last_query</code></p>
            </div>";
        } else {
            return false;    
        }
    }

    // ==================================================================
    //    Turn error handling on or off..

    function show_errors() {
        $this->show_errors = true;
    }
    
    function hide_errors() {
        $this->show_errors = false;
    }

    // ==================================================================
    //    Kill cached query results

    function flush() {
        $this->last_result = null;
        $this->col_info = null;
        $this->last_query = null;
    }

    // ==================================================================
    //    Basic Query    - see docs for more detail

    function 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 (SAVEQUERIES)
            $this->timer_start();
        
        $this->result = @mysql_query($query, $this->dbh);
        ++$this->num_queries;

        if (SAVEQUERIES)
            $this->queries[] = array( $query, $this->timer_stop() );

        // If there is an error then take note of it..
        if ( mysql_error() ) {
            $this->print_error();
            return false;
        }

        if ( preg_match("/^\\s*(insert|delete|update|replace) /i",$query) ) {
            $this->rows_affected = mysql_affected_rows();
            // Take note of the insert_id
            if ( preg_match("/^\\s*(insert|replace) /i",$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;
    }

    // ==================================================================
    //    Get one variable from the DB - see docs for more detail

    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 ( $this->last_result[$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;
    }

    // ==================================================================
    //    Get one row from the DB - see docs for more detail

    function get_row($query = null, $output = OBJECT, $y = 0) {
        $this->func_call = "\$db->get_row(\"$query\",$output,$y)";
        if ( $query )
            $this->query($query);

        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(" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N");
        }
    }

    // ==================================================================
    //    Function to get 1 column from the cached result set based in X index
    // se docs for usage and info

    function get_col($query = null , $x = 0) {
        if ( $query )
            $this->query($query);

        // 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;
    }

    // ==================================================================
    // Return the the query as a result set - see docs for more details

    function get_results($query = null, $output = OBJECT) {
        $this->func_call = "\$db->get_results(\"$query\", $output)";

        if ( $query )
            $this->query($query);

        // Send back array of objects. Each row is an object
        if ( $output == OBJECT ) {
            return $this->last_result;
        } elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
            if ( $this->last_result ) {
                $i = 0;
                foreach( $this->last_result as $row ) {
                    $new_array[$i] = (array) $row;
                    if ( $output == ARRAY_N ) {
                        $new_array[$i] = array_values($new_array[$i]);
                    }
                    $i++;
                }
                return $new_array;
            } else {
                return null;
            }
        }
    }


    // ==================================================================
    // Function to get column meta data info pertaining to the last query
    // see docs for more info and usage

    function get_col_info($info_type = 'name', $col_offset = -1) {
        if ( $this->col_info ) {
            if ( $col_offset == -1 ) {
                $i = 0;
                foreach($this->col_info as $col ) {
                    $new_array[$i] = $col->{$info_type};
                    $i++;
                }
                return $new_array;
            } else {
                return $this->col_info[$col_offset]->{$info_type};
            }
        }
    }

    function timer_start() {
        $mtime = microtime();
        $mtime = explode(' ', $mtime);
        $this->time_start = $mtime[1] + $mtime[0];
        return true;
    }
    
    function timer_stop($precision = 3) {
        $mtime = microtime();
        $mtime = explode(' ', $mtime);
        $time_end = $mtime[1] + $mtime[0];
        $time_total = $time_end - $this->time_start;
        return $time_total;
    }

    function bail($message) { // Just wraps errors in a nice header and footer
    if ( !$this->show_errors )
        return false;
    header( 'Content-Type: text/html; charset=utf-8');        
    echo <<<HEAD
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>WordPress &rsaquo; Error</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <style media="screen" type="text/css">
        <!--
        html {
            background: #eee;
        }
        body {
            background: #fff;
            color: #000;
            font-family: Georgia, "Times New Roman", Times, serif;
            margin-left: 25%;
            margin-right: 25%;
            padding: .2em 2em;
        }
        
        h1 {
            color: #006;
            font-size: 18px;
            font-weight: lighter;
        }
        
        h2 {
            font-size: 16px;
        }
        
        p, li, dt {
            line-height: 140%;
            padding-bottom: 2px;
        }
    
        ul, ol {
            padding: 5px 5px 5px 20px;
        }
        #logo {
            margin-bottom: 2em;
        }
        -->
        </style>
    </head>
    <body>
    <h1 id="logo"><img alt="WordPress" src="http://static.wordpress.org/logo.png" /></h1>
HEAD;
    echo $message;
    echo "</body></html>";
    die();
    }
}

$wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
?>