sql.php

一个用PHP编写的

<?php
/* $Id: sql.php,v 2.83.2.7 2006/04/27 08:57:09 nijel Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:

/**
 * Gets some core libraries
 */
require_once './libraries/common.lib.php';
require_once './libraries/tbl_indexes.lib.php';
require_once './libraries/check_user_privileges.lib.php';
require_once './libraries/bookmark.lib.php';

/**
 * Could be coming from a subform ("T" column expander) 
 */
if (isset($_REQUEST['dontlimitchars'])) {
    $dontlimitchars = $_REQUEST['dontlimitchars'];
}

/**
 * Defines the url to return to in case of error in a sql statement
 */
// Security checkings
if (!empty($goto)) {
    $is_gotofile     = preg_replace('@^([^?]+).*$@s', '\\1', $goto);
    if (!@file_exists('./' . $is_gotofile)) {
        unset($goto);
    } else {
        $is_gotofile = ($is_gotofile == $goto);
    }
} // end if (security checkings)

if (empty($goto)) {
    $goto = (! isset($table) || ! strlen($table)) ? $cfg['DefaultTabDatabase'] : $cfg['DefaultTabTable'];
    $is_gotofile  = true;
} // end if
if (!isset($err_url)) {
    $err_url = (!empty($back) ? $back : $goto)
             . '?' . PMA_generate_common_url(isset($db) ? $db : '')
             . ((strpos(' ' . $goto, 'db_details') != 1 && isset($table)) ? '&amp;table=' . urlencode($table) : '');
} // end if

// Coming from a bookmark dialog
if (isset($fields['query'])) {
    $sql_query = $fields['query'];
}

// This one is just to fill $db
if (isset($fields['dbase'])) {
    $db = $fields['dbase'];
}

// Default to browse if no query set an we have table (needed for browsing from DefaultTabTable)
if (!isset($sql_query) && isset($table) && isset($db)) {
    require_once './libraries/bookmark.lib.php';
    $book_sql_query = PMA_queryBookmarks($db, $GLOBALS['cfg']['Bookmark'], '\'' . PMA_sqlAddslashes($table) . '\'', 'label');
    if (!empty($book_sql_query)) {
        $sql_query = $book_sql_query;
    } else {
        $sql_query = 'SELECT * FROM ' . PMA_backquote($table);
    }
    unset($book_sql_query);

    // set $goto to what will be displayed if query returns 0 rows
    $goto = 'tbl_properties_structure.php';
} else {
    // Now we can check the parameters
    PMA_checkParameters(array('sql_query'));
}

// instead of doing the test twice
$is_drop_database = preg_match('/DROP[[:space:]]+(DATABASE|SCHEMA)[[:space:]]+/i',
    $sql_query);

/**
 * Check rights in case of DROP DATABASE
 *
 * This test may be bypassed if $is_js_confirmed = 1 (already checked with js)
 * but since a malicious user may pass this variable by url/form, we don't take
 * into account this case.
 */
if (!defined('PMA_CHK_DROP')
    && !$cfg['AllowUserDropDatabase']
    && $is_drop_database
    && !$is_superuser) {
    require_once './libraries/header.inc.php';
    PMA_mysqlDie($strNoDropDatabases, '', '', $err_url);
} // end if


/**
 * Need to find the real end of rows?
 */

if (isset($find_real_end) && $find_real_end) {
    $unlim_num_rows = PMA_countRecords($db, $table, true, true);
    $pos = @((ceil($unlim_num_rows / $session_max_rows) - 1) * $session_max_rows);
}
/**
 * Avoids undefined variables
 */
elseif (!isset($pos)) {
    $pos = 0;
}

/**
 * Bookmark add
 */
if (isset($store_bkm)) {
    PMA_addBookmarks($fields, $cfg['Bookmark'], (isset($bkm_all_users) && $bkm_all_users == 'true' ? true : false));
    PMA_sendHeaderLocation($cfg['PmaAbsoluteUri'] . $goto);
} // end if


/**
 * Gets the true sql query
 */
// $sql_query has been urlencoded in the confirmation form for drop/delete
// queries or in the navigation bar for browsing among records
if (isset($btnDrop) || isset($navig)) {
    $sql_query = urldecode($sql_query);
}

/**
 * Reformat the query
 */

$GLOBALS['unparsed_sql'] = $sql_query;
$parsed_sql = PMA_SQP_parse($sql_query);
$analyzed_sql = PMA_SQP_analyze($parsed_sql);

// Bug #641765 - Robbat2 - 12 January 2003, 10:49PM
// Reverted - Robbat2 - 13 January 2003, 2:40PM

// lem9: for bug 780516: now that we use case insensitive preg_match
// or flags from the analyser, do not put back the reformatted query
// into $sql_query, to make this kind of query work without
// capitalizing keywords:
//
// CREATE TABLE SG_Persons (
//  id int(10) unsigned NOT NULL auto_increment,
//  first varchar(64) NOT NULL default '',
//  PRIMARY KEY  (`id`)
// )
//
// Note: now we probably do not need to fill and use $GLOBALS['unparsed_sql']
// but I let this intact for now.
//
//$sql_query = PMA_SQP_formatHtml($parsed_sql, 'query_only');


// check for a real SELECT ... FROM
$is_select = isset($analyzed_sql[0]['queryflags']['select_from']);

// If the query is a Select, extract the db and table names and modify
// $db and $table, to have correct page headers, links and left frame.
// db and table name may be enclosed with backquotes, db is optionnal,
// query may contain aliases.

// (TODO: if there are more than one table name in the Select:
// - do not extract the first table name
// - do not show a table name in the page header
// - do not display the sub-pages links)

if ($is_select) {
    $prev_db = $db;
    if (isset($analyzed_sql[0]['table_ref'][0]['table_true_name'])) {
        $table = $analyzed_sql[0]['table_ref'][0]['table_true_name'];
    }
    if (isset($analyzed_sql[0]['table_ref'][0]['db'])
      && strlen($analyzed_sql[0]['table_ref'][0]['db'])) {
        $db    = $analyzed_sql[0]['table_ref'][0]['db'];
    } else {
        $db = $prev_db;
    }
    // Nijel: don't change reload, if we already decided to reload in import
    if (empty($reload)) {
        $reload  = ($db == $prev_db) ? 0 : 1;
    }
}

/**
 * Sets or modifies the $goto variable if required
 */
if ($goto == 'sql.php') {
    $is_gotofile = false;
    $goto = 'sql.php?'
          . PMA_generate_common_url($db, $table)
          . '&amp;pos=' . $pos
          . '&amp;sql_query=' . urlencode($sql_query);
} // end if


/**
 * Go back to further page if table should not be dropped
 */
if (isset($btnDrop) && $btnDrop == $strNo) {
    if (!empty($back)) {
        $goto = $back;
    }
    if ($is_gotofile) {
        if (strpos(' ' . $goto, 'db_details') == 1 && isset($table) && strlen($table)) {
            unset($table);
        }
        $active_page = $goto;
        require './' . PMA_securePath($goto);
    } else {
        PMA_sendHeaderLocation($cfg['PmaAbsoluteUri'] . str_replace('&amp;', '&', $goto));
    }
    exit();
} // end if


/**
 * Displays the confirm page if required
 *
 * This part of the script is bypassed if $is_js_confirmed = 1 (already checked
 * with js) because possible security issue is not so important here: at most,
 * the confirm message isn't displayed.
 *
 * Also bypassed if only showing php code.or validating a SQL query
 */
if (!$cfg['Confirm']
    || (isset($is_js_confirmed) && $is_js_confirmed)
    || isset($btnDrop)

    // if we are coming from a "Create PHP code" or a "Without PHP Code"
    // dialog, we won't execute the query anyway, so don't confirm
    //|| !empty($GLOBALS['show_as_php'])
    || isset($GLOBALS['show_as_php'])

    || !empty($GLOBALS['validatequery'])) {
    $do_confirm = false;
} else {
    $do_confirm = isset($analyzed_sql[0]['queryflags']['need_confirm']);
}

if ($do_confirm) {
    $stripped_sql_query = $sql_query;
    require_once './libraries/header.inc.php';
    if ($is_drop_database) {
        echo '<h1 class="warning">' . $strDropDatabaseStrongWarning . '</h1>';
    }
    echo '<form action="sql.php" method="post">' . "\n"
        .PMA_generate_common_hidden_inputs($db, (isset($table)?$table:''));
    ?>
    <input type="hidden" name="sql_query" value="<?php echo urlencode($sql_query); ?>" />
    <input type="hidden" name="zero_rows" value="<?php echo isset($zero_rows) ? PMA_sanitize($zero_rows) : ''; ?>" />
    <input type="hidden" name="goto" value="<?php echo $goto; ?>" />
    <input type="hidden" name="back" value="<?php echo isset($back) ? PMA_sanitize($back) : ''; ?>" />
    <input type="hidden" name="reload" value="<?php echo isset($reload) ? PMA_sanitize($reload) : 0; ?>" />
    <input type="hidden" name="purge" value="<?php echo isset($purge) ? PMA_sanitize($purge) : ''; ?>" />
    <input type="hidden" name="cpurge" value="<?php echo isset($cpurge) ? PMA_sanitize($cpurge) : ''; ?>" />
    <input type="hidden" name="purgekey" value="<?php echo isset($purgekey) ? PMA_sanitize($purgekey) : ''; ?>" />
    <input type="hidden" name="show_query" value="<?php echo isset($show_query) ? PMA_sanitize($show_query) : ''; ?>" />
    <?php
    echo '<fieldset class="confirmation">' . "\n"
        .'    <legend>' . $strDoYouReally . '</legend>'
        .'    <tt>' . htmlspecialchars($stripped_sql_query) . '</tt>' . "\n"
        .'</fieldset>' . "\n"
        .'<fieldset class="tblFooters">' . "\n";
    ?>
    <input type="submit" name="btnDrop" value="<?php echo $strYes; ?>" id="buttonYes" />
    <input type="submit" name="btnDrop" value="<?php echo $strNo; ?>" id="buttonNo" />
    <?php
    echo '</fieldset>' . "\n"
       . '</form>' . "\n";
} // end if $do_confirm


/**
 * Executes the query and displays results
 */
else {
    if (!isset($sql_query)) {
        $sql_query = '';
    }
    // Defines some variables
    // A table has to be created or renamed -> left frame should be reloaded
    // TODO: use the parser/analyzer

    if (empty($reload)
        && preg_match('/^(CREATE|ALTER|DROP)\s+(VIEW|TABLE|DATABASE|SCHEMA)\s+/i', $sql_query)) {
        $reload           = 1;
    }
    // Gets the number of rows per page
    if (empty($session_max_rows)) {
        $session_max_rows = $cfg['MaxRows'];
    } elseif ($session_max_rows != 'all') {
        $cfg['MaxRows']   = $session_max_rows;
    }
    // Defines the display mode (horizontal/vertical) and header "frequency"
    if (empty($disp_direction)) {
        $disp_direction   = $cfg['DefaultDisplay'];
    }
    if (empty($repeat_cells)) {
        $repeat_cells     = $cfg['RepeatCells'];
    }

    // SK -- Patch: $is_group added for use in calculation of total number of
    //              rows.
    //              $is_count is changed for more correct "LIMIT" clause
    //              appending in queries like
    //                "SELECT COUNT(...) FROM ... GROUP BY ..."

    // TODO: detect all this with the parser, to avoid problems finding
    // those strings in comments or backquoted identifiers

    $is_explain = $is_count = $is_export = $is_delete = $is_insert = $is_affected = $is_show = $is_maint = $is_analyse = $is_group = $is_func = $is_replace = false;
    if ($is_select) { // see line 141
        $is_group = preg_match('@(GROUP[[:space:]]+BY|HAVING|SELECT[[:space:]]+DISTINCT)[[:space:]]+@i', $sql_query);
        $is_func =  !$is_group && (preg_match('@[[:space:]]+(SUM|AVG|STD|STDDEV|MIN|MAX|BIT_OR|BIT_AND)\s*\(@i', $sql_query));
        $is_count = !$is_group && (preg_match('@^SELECT[[:space:]]+COUNT\((.*\.+)?.*\)@i', $sql_query));
        $is_export   = (preg_match('@[[:space:]]+INTO[[:space:]]+OUTFILE[[:space:]]+@i', $sql_query));
        $is_analyse  = (preg_match('@[[:space:]]+PROCEDURE[[:space:]]+ANALYSE@i', $sql_query));
    } elseif (preg_match('@^EXPLAIN[[:space:]]+@i', $sql_query)) {
        $is_explain  = true;