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File://home/homepage/ebmmunjin/_mysql/libraries/relation.lib.php

<?php
/* $Id: relation.lib.php,v 2.45 2005/10/23 12:14:22 lem9 Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:

/**
 * Set of functions used with the relation and pdf feature
 */

/**
 * Executes a query as controluser if possible, otherwise as normal user
 *
 * @param   string    the query to execute
 * @param   boolean   whether to display SQL error messages or not
 *
 * @return  integer   the result id
 *
 * @global  string    the URL of the page to show in case of error
 * @global  string    the name of db to come back to
 * @global  resource  the resource id of DB connect as controluser
 * @global  array     configuration infos about the relations stuff
 *
 * @access  public
 *
 * @author  Mike Beck <mikebeck@users.sourceforge.net>
 */
 function PMA_query_as_cu($sql, $show_error = TRUE, $options = 0) {
    global $err_url_0, $db, $dbh, $cfgRelation;

    if ($dbh == $GLOBALS['userlink']) {
        PMA_DBI_select_db($cfgRelation['db'], $dbh);
    }
    if ($show_error) {
        $result = PMA_DBI_query($sql, $dbh, $options);
    } else {
        $result = @PMA_DBI_try_query($sql, $dbh, $options);
    } // end if... else...
    // It makes no sense to restore database on control user
    if ($dbh == $GLOBALS['userlink']) {
        PMA_DBI_select_db($db, $dbh);
    }

    if ($result) {
        return $result;
    } else {
        return FALSE;
    }
 } // end of the "PMA_query_as_cu()" function 


/**
 * Defines the relation parameters for the current user
 * just a copy of the functions used for relations ;-)
 * but added some stuff to check what will work
 *
 * @param   boolean  whether to check validity of settings or not
 *
 * @return  array    the relation parameters for the current user
 *
 * @global  array    the list of settings for servers
 * @global  integer  the id of the current server
 * @global  string   the URL of the page to show in case of error
 * @global  string   the name of the current db
 * @global  string   the name of the current table
 * @global  array    configuration infos about the relations stuff
 *
 * @access  public
 *
 * @author  Mike Beck <mikebeck@users.sourceforge.net>
 */
function PMA_getRelationsParam($verbose = FALSE)
{
    global $cfg, $server, $err_url_0, $db, $table, $dbh;
    global $cfgRelation;

    $cfgRelation                = array();
    $cfgRelation['relwork']     = FALSE;
    $cfgRelation['displaywork'] = FALSE;
    $cfgRelation['bookmarkwork']= FALSE;
    $cfgRelation['pdfwork']     = FALSE;
    $cfgRelation['commwork']    = FALSE;
    $cfgRelation['mimework']    = FALSE;
    $cfgRelation['historywork'] = FALSE;
    $cfgRelation['allworks']    = FALSE;

    // No server selected -> no bookmark table
    // we return the array with the FALSEs in it,
    // to avoid some 'Unitialized string offset' errors later
    if ($server == 0
       || empty($cfg['Server'])
       || empty($cfg['Server']['pmadb'])) {
        if ($verbose == TRUE) {
            echo 'PMA Database ... '
                 . '<font color="red"><b>' . $GLOBALS['strNotOK'] . '</b></font>'
                 . '[ <a href="Documentation.html#pmadb">' . $GLOBALS['strDocu'] . '</a> ]<br />' . "\n"
                 . $GLOBALS['strGeneralRelationFeat']
                 . ' <font color="green">' . $GLOBALS['strDisabled'] . '</font>' . "\n";
        }
        return $cfgRelation;
    }

    $cfgRelation['user']  = $cfg['Server']['user'];
    $cfgRelation['db']    = $cfg['Server']['pmadb'];

    //  Now I just check if all tables that i need are present so I can for
    //  example enable relations but not pdf...
    //  I was thinking of checking if they have all required columns but I
    //  fear it might be too slow

    PMA_DBI_select_db($cfgRelation['db'], $dbh);
    $tab_query = 'SHOW TABLES FROM ' . PMA_backquote($cfgRelation['db']);
    $tab_rs    = PMA_query_as_cu($tab_query, FALSE, PMA_DBI_QUERY_STORE);

    if ($tab_rs) {
        while ($curr_table = @PMA_DBI_fetch_row($tab_rs)) {
            if ($curr_table[0] == $cfg['Server']['bookmarktable']) {
                $cfgRelation['bookmark']        = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['relation']) {
                $cfgRelation['relation']        = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['table_info']) {
                $cfgRelation['table_info']      = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['table_coords']) {
                $cfgRelation['table_coords']    = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['column_info']) {
                $cfgRelation['column_info'] = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['pdf_pages']) {
                $cfgRelation['pdf_pages']       = $curr_table[0];
            } else if ($curr_table[0] == $cfg['Server']['history']) {
                $cfgRelation['history'] = $curr_table[0];
            }
        } // end while
    }

    if (isset($cfgRelation['relation'])) {
        $cfgRelation['relwork']         = TRUE;
        if (isset($cfgRelation['table_info'])) {
                $cfgRelation['displaywork'] = TRUE;
        }
    }
    if (isset($cfgRelation['table_coords']) && isset($cfgRelation['pdf_pages'])) {
        $cfgRelation['pdfwork']     = TRUE;
    }
    if (isset($cfgRelation['column_info'])) {
        $cfgRelation['commwork']    = TRUE;

        if ($cfg['Server']['verbose_check']) {
            $mime_query  = 'SHOW FIELDS FROM ' . PMA_backquote($cfgRelation['db']) . '.' . PMA_backquote($cfgRelation['column_info']);
            $mime_rs     = PMA_query_as_cu($mime_query, FALSE);

            $mime_field_mimetype                = FALSE;
            $mime_field_transformation          = FALSE;
            $mime_field_transformation_options  = FALSE;
            while ($curr_mime_field = @PMA_DBI_fetch_row($mime_rs)) {
                if ($curr_mime_field[0] == 'mimetype') {
                    $mime_field_mimetype               = TRUE;
                } else if ($curr_mime_field[0] == 'transformation') {
                    $mime_field_transformation         = TRUE;
                } else if ($curr_mime_field[0] == 'transformation_options') {
                    $mime_field_transformation_options = TRUE;
                }
            }
            PMA_DBI_free_result($mime_rs);

            if ($mime_field_mimetype == TRUE
                && $mime_field_transformation == TRUE
                && $mime_field_transformation_options == TRUE) {
                $cfgRelation['mimework'] = TRUE;
            }
        } else {
            $cfgRelation['mimework'] = TRUE;
        }
    }

    if (isset($cfgRelation['history'])) {
        $cfgRelation['historywork']     = TRUE;
    }

    if (isset($cfgRelation['bookmark'])) {
        $cfgRelation['bookmarkwork']     = TRUE;
    }

    if ($cfgRelation['relwork'] == TRUE && $cfgRelation['displaywork'] == TRUE
        && $cfgRelation['pdfwork'] == TRUE && $cfgRelation['commwork'] == TRUE
        && $cfgRelation['mimework'] == TRUE && $cfgRelation['historywork'] == TRUE
        && $cfgRelation['bookmarkwork'] == TRUE) {
        $cfgRelation['allworks'] = TRUE;
    }
    if ($tab_rs) {
        PMA_DBI_free_result($tab_rs);
    } else {
        $cfg['Server']['pmadb'] = FALSE;
    }

    if ($verbose == TRUE) {
        $shit     = '<font color="red"><b>' . $GLOBALS['strNotOK'] . '</b></font> [ <a href="Documentation.html#%s">' . $GLOBALS['strDocu'] . '</a> ]';
        $hit      = '<font color="green"><b>' . $GLOBALS['strOK'] . '</b></font>';
        $enabled  = '<font color="green">' . $GLOBALS['strEnabled'] . '</font>';
        $disabled = '<font color="red">'   . $GLOBALS['strDisabled'] . '</font>';

        echo '<table>' . "\n";
        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'pmadb\'] ... </th><td align="right">'
             . (($cfg['Server']['pmadb'] == FALSE) ? sprintf($shit, 'pmadb') : $hit)
             . '</td></tr>' . "\n";
        echo '    <tr><td>&nbsp;</td></tr>' . "\n";

        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'relation\'] ... </th><td align="right">'
             . ((isset($cfgRelation['relation'])) ? $hit : sprintf($shit, 'relation'))
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">'. $GLOBALS['strGeneralRelationFeat'] . ': '
             . (($cfgRelation['relwork'] == TRUE) ? $enabled :  $disabled)
             . '</td></tr>' . "\n";
        echo '    <tr><td>&nbsp;</td></tr>' . "\n";

        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'table_info\']   ... </th><td align="right">'
             . (($cfgRelation['displaywork'] == FALSE) ? sprintf($shit, 'table_info') : $hit)
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">' . $GLOBALS['strDisplayFeat'] . ': '
             . (($cfgRelation['displaywork'] == TRUE) ? $enabled : $disabled)
             . '</td></tr>' . "\n";
        echo '    <tr><td>&nbsp;</td></tr>' . "\n";

        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'table_coords\'] ... </th><td align="right">'
             . ((isset($cfgRelation['table_coords'])) ? $hit : sprintf($shit, 'table_coords'))
             . '</td></tr>' . "\n";
        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'pdf_pages\'] ... </th><td align="right">'
             . ((isset($cfgRelation['pdf_pages'])) ? $hit : sprintf($shit, 'table_coords'))
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">' . $GLOBALS['strCreatePdfFeat'] . ': '
             . (($cfgRelation['pdfwork'] == TRUE) ? $enabled : $disabled)
             . '</td></tr>' . "\n";
        echo '    <tr><td>&nbsp;</td></tr>' . "\n";

        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'column_info\'] ... </th><td align="right">'
             . ((isset($cfgRelation['column_info'])) ? $hit : sprintf($shit, 'col_com'))
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">' . $GLOBALS['strColComFeat'] . ': '
             . (($cfgRelation['commwork'] == TRUE) ? $enabled : $disabled)
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">' . $GLOBALS['strBookmarkQuery'] . ': '
             . (($cfgRelation['bookmarkwork'] == TRUE) ? $enabled : $disabled)
             . '</td></tr>' . "\n";
        echo '    <tr><th align="left">MIME ...</th><td align="right">'
             . (($cfgRelation['mimework'] == TRUE) ? $hit : sprintf($shit, 'col_com'))
             . '</td></tr>' . "\n";

             if (($cfgRelation['commwork'] == TRUE) && ($cfgRelation['mimework'] != TRUE)) {
                 echo '<tr><td colspan=2 align="left">' . $GLOBALS['strUpdComTab'] . '</td></tr>' . "\n";
             }

        echo '    <tr><th align="left">$cfg[\'Servers\'][$i][\'history\'] ... </th><td align="right">'
             . ((isset($cfgRelation['history'])) ? $hit : sprintf($shit, 'history'))
             . '</td></tr>' . "\n";
        echo '    <tr><td colspan=2 align="center">' . $GLOBALS['strQuerySQLHistory'] . ': '
             . (($cfgRelation['historywork'] == TRUE) ? $enabled : $disabled)
             . '</td></tr>' . "\n";

        echo '</table>' . "\n";
    } // end if ($verbose == TRUE) {

    return $cfgRelation;
} // end of the 'PMA_getRelationsParam()' function


/**
 * Gets all Relations to foreign tables for a given table or
 * optionally a given column in a table
 *
 * @param   string   the name of the db to check for
 * @param   string   the name of the table to check for
 * @param   string   the name of the column to check for
 * @param   string   the source for foreign key information
 *
 * @return  array    db,table,column
 *
 * @global  array    the list of relations settings
 * @global  string   the URL of the page to show in case of error
 *
 * @access  public
 *
 * @author  Mike Beck <mikebeck@users.sourceforge.net> and Marc Delisle
 */
function PMA_getForeigners($db, $table, $column = '', $source = 'both') {
    global $cfgRelation, $err_url_0;

    if ($cfgRelation['relwork'] && ($source == 'both' || $source == 'internal')) {
        $rel_query          = 'SELECT master_field, foreign_db, foreign_table, foreign_field'
                            . ' FROM ' . PMA_backquote($cfgRelation['relation'])
                            . ' WHERE master_db =  \'' . PMA_sqlAddslashes($db) . '\' '
                            . ' AND   master_table = \'' . PMA_sqlAddslashes($table) . '\' ';
        if (!empty($column)) {
            $rel_query .= ' AND   master_field = \'' . PMA_sqlAddslashes($column) . '\'';
        }
        $relations     = PMA_query_as_cu($rel_query);
        $i = 0;
        while ($relrow = PMA_DBI_fetch_assoc($relations)) {
            $field                            = $relrow['master_field'];
            $foreign[$field]['foreign_db']    = $relrow['foreign_db'];
            $foreign[$field]['foreign_table'] = $relrow['foreign_table'];
            $foreign[$field]['foreign_field'] = $relrow['foreign_field'];
            $i++;
        } // end while
        PMA_DBI_free_result($relations);
        unset($relations);
    }

    if (($source == 'both' || $source == 'innodb') && !empty($table)) {
        $show_create_table_query = 'SHOW CREATE TABLE '
            . PMA_backquote($db) . '.' . PMA_backquote($table);
        $show_create_table_res = PMA_DBI_query($show_create_table_query);
        list(,$show_create_table) = PMA_DBI_fetch_row($show_create_table_res);
        PMA_DBI_free_result($show_create_table_res);
        unset($show_create_table_res, $show_create_table_query);
        $analyzed_sql = PMA_SQP_analyze(PMA_SQP_parse($show_create_table));

        foreach ($analyzed_sql[0]['foreign_keys'] AS $one_key) {

        // the analyzer may return more than one column name in the
        // index list or the ref_index_list
            foreach ($one_key['index_list'] AS $i => $field) {

        // If a foreign key is defined in the 'internal' source (pmadb)
        // and in 'innodb', we won't get it twice if $source='both'
        // because we use $field as key

                // The parser looks for a CONSTRAINT clause just before
                // the FOREIGN KEY clause. It finds it (as output from
                // SHOW CREATE TABLE) in MySQL 4.0.13, but not in older
                // versions like 3.23.58. 
                // In those cases, the FOREIGN KEY parsing will put numbers
                // like -1, 0, 1... instead of the constraint number.

                if (isset($one_key['constraint'])) {
                    $foreign[$field]['constraint'] = $one_key['constraint'];
                }

                if (isset($one_key['ref_db_name'])) {
                    $foreign[$field]['foreign_db']    = $one_key['ref_db_name'];
                } else {
                    $foreign[$field]['foreign_db']    = $db;
                }
                $foreign[$field]['foreign_table'] = $one_key['ref_table_name'];
                $foreign[$field]['foreign_field'] = $one_key['ref_index_list'][$i];
                if (isset($one_key['on_delete'])) {
                    $foreign[$field]['on_delete'] = $one_key['on_delete'];
                }
                if (isset($one_key['on_update'])) {
                    $foreign[$field]['on_update'] = $one_key['on_update'];
                }
            }
        }
    }

    /**
     * Emulating relations for some information_schema tables
     */
    if (PMA_MYSQL_INT_VERSION >= 50002 && $db == 'information_schema'
        && ($source == 'internal' || $source == 'both')) {

        require_once('./libraries/information_schema_relations.lib.php');

        if (!isset($foreign)) {
            $foreign = array();
        }

        if (isset($GLOBALS['information_schema_relations'][$table])) {
            foreach ($GLOBALS['information_schema_relations'][$table] as $field => $relations) {
                if ((empty($column) || $column == $field) && empty($foreign[$field])) {
                    $foreign[$field] = $relations;
                }
            }
        }
    }

    if (!empty($foreign) && is_array($foreign)) {
       return $foreign;
    } else {
        return FALSE;
    }

} // end of the 'PMA_getForeigners()' function


/**
 * Gets the display field of a table
 *
 * @param   string   the name of the db to check for
 * @param   string   the name of the table to check for
 *
 * @return  string   field name
 *
 * @global  array    the list of relations settings
 *
 * @access  public
 *
 * @author  Mike Beck <mikebeck@users.sourceforge.net>
 */
function PMA_getDisplayField($db, $table) {
    global $cfgRelation;

    /**
     * Try to fetch the display field from DB.
     */
    if (trim(@$cfgRelation['table_info']) != '') {

        $disp_query = 'SELECT display_field FROM ' . PMA_backquote($cfgRelation['table_info'])
                    . ' WHERE db_name    = \'' . PMA_sqlAddslashes($db) . '\''
                    . ' AND   table_name = \'' . PMA_sqlAddslashes($table) . '\'';

        $disp_res   = PMA_query_as_cu($disp_query);
        $row        = ($disp_res ? PMA_DBI_fetch_assoc($disp_res) : '');
        PMA_DBI_free_result($disp_res);
        if (isset($row['display_field'])) {
            return $row['display_field'];
        }

    }

    /**
     * Emulating the display field for some information_schema tables.
     */
    if (PMA_MYSQL_INT_VERSION >= 50002 && $db == 'information_schema') {
        switch ($table) {
            case 'CHARACTER_SETS': return 'DESCRIPTION';
            case 'TABLES':         return 'TABLE_COMMENT';
        }
    }

    /**
     * No Luck...
     */
    return FALSE;

} // end of the 'PMA_getDisplayField()' function


/**
 * Gets the comments for all rows of a table
 *
 * @param   string   the name of the db to check for
 * @param   string   the name of the table to check for
 *
 * @return  array    [field_name] = comment
 *
 * @global  array    the list of relations settings
 *
 * @access  public
 *
 * @authors  Mike Beck <mikebeck@users.sourceforge.net>
 *           and lem9
 */
function PMA_getComments($db, $table = '') {
    global $cfgRelation;

    if ($table != '') {

        // MySQL 4.1.x native column comments
        if (PMA_MYSQL_INT_VERSION >= 40100) {
            $fields = PMA_DBI_get_fields($db, $table);
            if ($fields) {
                foreach($fields as $key=>$field) {
                    $tmp_col = $field['Field'];
                    if (!empty($field['Comment'])) {
                        $native_comment[$tmp_col] = $field['Comment'];
                    }
                }
                if (isset($native_comment)) {
                    $comment = $native_comment;
                }
            }
        }

        // pmadb internal column comments
        // (this function can be called even if $cfgRelation['commwork'] is
        // FALSE, to get native column comments, so recheck here)
        if ($cfgRelation['commwork']) {
            $com_qry = 'SELECT column_name, comment FROM ' . PMA_backquote($cfgRelation['db']) . '.' .PMA_backquote($cfgRelation['column_info'])
                     . ' WHERE db_name    = \'' . PMA_sqlAddslashes($db) . '\''
                     . ' AND   table_name = \'' . PMA_sqlAddslashes($table) . '\'';
            $com_rs   = PMA_query_as_cu($com_qry, TRUE, PMA_DBI_QUERY_STORE);
        }
    } else {
        // pmadb internal db comments
        $com_qry = 'SELECT ' . PMA_backquote('comment') . ' FROM ' . PMA_backquote($cfgRelation['db']) . '.' . PMA_backquote($cfgRelation['column_info'])
                 . ' WHERE db_name     = \'' . PMA_sqlAddslashes($db) . '\''
                 . ' AND   table_name  = \'\''
                 . ' AND   column_name = \'(db_comment)\'';
        $com_rs   = PMA_query_as_cu($com_qry, TRUE, PMA_DBI_QUERY_STORE);
    }


    if (isset($com_rs) && PMA_DBI_num_rows($com_rs) > 0) {
        $i = 0;
        while ($row = PMA_DBI_fetch_assoc($com_rs)) {
            $i++;
            $col           = ($table != '' ? $row['column_name'] : $i);

            if (strlen($row['comment']) > 0) {
                $comment[$col] = $row['comment'];
                // if this version supports native comments and this function
                // was called with a table parameter 
                if (PMA_MYSQL_INT_VERSION >= 40100 && !empty($table)) {
                    // if native comment found, use it instead of pmadb
                    if (!empty($native_comment[$col])) {
                        $comment[$col] = $native_comment[$col];
                    } else {
                        // no native comment, so migrate pmadb-style to native
                        PMA_setComment($db, $table, $col, $comment[$col],'','native');
                        // and erase the pmadb-style comment
                        PMA_setComment($db, $table, $col, '','','pmadb');
                    }
                }
            }
        } // end while

        PMA_DBI_free_result($com_rs);
        unset($com_rs);
    }

    if (isset($comment) && is_array($comment)) {
        return $comment;
     } else {
        return FALSE;
     }
 } // end of the 'PMA_getComments()' function

/**
 * Adds/removes slashes if required
 *
 * @param   string  the string to slash
 *
 * @return  string  the slashed string
 *
 * @access  public
 */
function PMA_handleSlashes($val) {
  return (get_magic_quotes_gpc() ? str_replace('\\"', '"', $val) : PMA_sqlAddslashes($val));
} // end of the "PMA_handleSlashes()" function

/**
 * Set a single comment to a certain value.
 *
 * @param   string   the name of the db
 * @param   string   the name of the table (may be empty in case of a db comment)
 * @param   string   the name of the column
 * @param   string   the value of the column
 * @param   string   (optional) if a column is renamed, this is the name of the former key which will get deleted
 * @param   string   whether we set pmadb comments, native comments or both
 *
 * @return  boolean  true, if comment-query was made.
 *
 * @global  array    the list of relations settings
 *
 * @access  public
 */
function PMA_setComment($db, $table, $col, $comment, $removekey = '', $mode='auto') {
    global $cfgRelation;

    if ($mode=='auto') {
        if (PMA_MYSQL_INT_VERSION >= 40100) {
            $mode='native';
        } else {
            $mode='pmadb';
        }
    }

    // native mode is only for column comments so we need a table name
    if ($mode == 'native' && !empty($table)) {
        $query = 'ALTER TABLE ' . PMA_backquote($table) . ' CHANGE '
            . PMA_generateAlterTable($col, $col, '', '', '', '', FALSE, '', FALSE, '', $comment, '', '');
        PMA_DBI_try_query($query, NULL, PMA_DBI_QUERY_STORE);
        return TRUE;
    }

    // $mode == 'pmadb' section: 
    
    $cols = array(
        'db_name'     => 'db_name    ',
        'table_name'  => 'table_name ',
        'column_name' => 'column_name'
    );

    if ($removekey != '' AND $removekey != $col) {
        $remove_query = 'DELETE FROM ' . PMA_backquote($cfgRelation['column_info'])
                      . ' WHERE ' . $cols['db_name']     . ' = \'' . PMA_sqlAddslashes($db) . '\''
                      . ' AND   ' . $cols['table_name']  . ' = \'' . PMA_sqlAddslashes($table) . '\''
                      . ' AND   ' . $cols['column_name'] . ' = \'' . PMA_sqlAddslashes($removekey) . '\'';
        PMA_query_as_cu($remove_query);
        unset($remove_query);
    }

    $test_qry = 'SELECT ' . PMA_backquote('comment') . ', mimetype, transformation, transformation_options FROM ' . PMA_backquote($cfgRelation['column_info'])
              . ' WHERE ' . $cols['db_name']     . ' = \'' . PMA_sqlAddslashes($db) . '\''
              . ' AND   ' . $cols['table_name']  . ' = \'' . PMA_sqlAddslashes($table) . '\''
              . ' AND   ' . $cols['column_name'] . ' = \'' . PMA_sqlAddslashes($col) . '\'';
    $test_rs   = PMA_query_as_cu($test_qry, TRUE, PMA_DBI_QUERY_STORE);

    if ($test_rs && PMA_DBI_num_rows($test_rs) > 0) {
        $row = PMA_DBI_fetch_assoc($test_rs);
        PMA_DBI_free_result($test_rs);

        if (strlen($comment) > 0 || strlen($row['mimetype']) > 0 || strlen($row['transformation']) > 0 || strlen($row['transformation_options']) > 0) {
            $upd_query = 'UPDATE ' . PMA_backquote($cfgRelation['column_info'])
                       . ' SET ' . PMA_backquote('comment') . ' = \'' . PMA_sqlAddslashes($comment) . '\''
                       . ' WHERE ' . $cols['db_name']     . ' = \'' . PMA_sqlAddslashes($db) . '\''
                       . ' AND   ' . $cols['table_name']  . ' = \'' . PMA_sqlAddslashes($table) . '\''
                       . ' AND   ' . $cols['column_name'] . ' = \'' . PMA_sqlAddSlashes($col) . '\'';
        } else {
            $upd_query = 'DELETE FROM ' . PMA_backquote($cfgRelation['column_info'])
                       . ' WHERE ' . $cols['db_name']     . ' = \'' . PMA_sqlAddslashes($db) . '\''
                       . ' AND   ' . $cols['table_name']  . ' = \'' . PMA_sqlAddslashes($table) . '\''
                       . ' AND   ' . $cols['column_name'] . ' = \'' . PMA_sqlAddslashes($col) . '\'';
        }
    } else if (strlen($comment) > 0) {
        $upd_query = 'INSERT INTO ' . PMA_backquote($cfgRelation['column_info'])
                   . ' (db_name, table_name, column_name, ' . PMA_backquote('comment') . ') '
                   . ' VALUES('
                   . '\'' . PMA_sqlAddslashes($db) . '\','
                   . '\'' . PMA_sqlAddslashes($table) . '\','
                   . '\'' . PMA_sqlAddslashes($col) . '\','
                   . '\'' . PMA_sqlAddslashes($comment) . '\')';
    }

    if (isset($upd_query)){
        $upd_rs    = PMA_query_as_cu($upd_query);
        unset($upd_query);
        return true;
    } else {
        return false;
    }
} // end of 'PMA_setComment()' function

/**
 * Set a SQL history entry
 *
 * @param   string   the name of the db
 * @param   string   the name of the table
 * @param   string   the username
 * @param   string   the sql query
 *
 * @global  array    the list of relations settings
 *
 * @return  boolean  true
 *
 * @access  public
 */
function PMA_setHistory($db, $table, $username, $sqlquery) {
    global $cfgRelation;

    $hist_rs    = PMA_query_as_cu('INSERT INTO ' . PMA_backquote($cfgRelation['history']) . ' ('
                . PMA_backquote('username') . ','
                . PMA_backquote('db') . ','
                . PMA_backquote('table') . ','
                . PMA_backquote('timevalue') . ','
                . PMA_backquote('sqlquery')
                . ') VALUES ('
                . '\'' . PMA_sqlAddslashes($username) . '\','
                . '\'' . PMA_sqlAddslashes($db) . '\','
                . '\'' . PMA_sqlAddslashes($table) . '\','
                . 'NOW(),'
                . '\'' . PMA_sqlAddslashes($sqlquery) . '\')');
    return true;
} // end of 'PMA_setHistory()' function

/**
 * Gets a SQL history entry
 *
 * @param   string   the username
 *
 * @global  array    the list of relations settings
 *
 * @return  array    list of history items
 *
 * @access  public
 */
function PMA_getHistory($username) {
    global $cfgRelation;

    $hist_query = 'SELECT '
                . PMA_backquote('db') . ','
                . PMA_backquote('table') . ','
                . PMA_backquote('sqlquery')
                . ' FROM ' . PMA_backquote($cfgRelation['history'])
                . ' WHERE username = \'' . PMA_sqlAddslashes($username) . '\''
                . ' ORDER BY id DESC';

    $hist_rs = PMA_query_as_cu($hist_query);
    unset($hist_query);

    $history = array();

    while ($row = PMA_DBI_fetch_assoc($hist_rs)) {
        $history[] = $row;
    }
    PMA_DBI_free_result($hist_rs);

    return $history;

} // end of 'PMA_getHistory()' function

/**
 * Set a SQL history entry
 *
 * @param   string   the name of the db
 * @param   string   the name of the table
 * @param   string   the username
 * @param   string   the sql query
 *
 * @global  array    the list of relations settings
 * @global  array    global phpMyAdmin configuration
 *
 * @return  boolean  true
 *
 * @access  public
 */
function PMA_purgeHistory($username) {
    global $cfgRelation, $cfg;

    $purge_query = 'SELECT timevalue FROM ' . PMA_backquote($cfgRelation['history'])
                 . ' WHERE username = \'' . PMA_sqlAddSlashes($username) . '\''
                 . ' ORDER BY timevalue DESC LIMIT ' . $cfg['QueryHistoryMax'] . ', 1';
    $purge_rs = PMA_query_as_cu($purge_query);
    $i = 0;
    $row = PMA_DBI_fetch_row($purge_rs);
    PMA_DBI_free_result($purge_rs);

    if (is_array($row) && isset($row[0]) && $row[0] > 0) {
        $maxtime = $row[0];
        // quotes added around $maxtime to prevent a difficult to
        // reproduce problem
        $remove_rs = PMA_query_as_cu('DELETE FROM ' . PMA_backquote($cfgRelation['history']) . ' WHERE timevalue <= "' . $maxtime . '"');
    }

    return true;
} // end of 'PMA_purgeHistory()' function


/**
 * Prepares the dropdown for one mode 
 *
 * @param   array    the keys and values for foreigns
 * @param   string   the current data of the dropdown
 * @param   string   the needed mode 
 *
 * @global  array    global phpMyAdmin configuration
 *
 * @return  array   the <option value=""><option>s
 *
 * @access  private
 */
function PMA_foreignDropdownBuild($foreign, $data, $mode) {
    global $cfg;

    $reloptions = array();
    
    foreach ($foreign as $key => $value) {

        if (PMA_strlen($value) <= $cfg['LimitChars']) {
            $vtitle = '';
            $value  = htmlspecialchars($value);
        } else {
            $vtitle  = htmlspecialchars($value);
            $value  = htmlspecialchars(substr($value, 0, $cfg['LimitChars']) . '...');
        }

        $reloption = '                <option value="' . htmlspecialchars($key) . '"';
        if ($vtitle != '') {
            $reloption .= ' title="' . $vtitle . '"';
        }

        if ($key == $data) {
           $reloption .= ' selected="selected"';
        }

        if ($mode == 'content-id') {
            $reloptions[] = $reloption . '>' . $value . '&nbsp;-&nbsp;' . htmlspecialchars($key) .  '</option>' . "\n";
        } else {
            $reloptions[] = $reloption . '>' . htmlspecialchars($key) .  '&nbsp;-&nbsp;' . $value . '</option>' . "\n";
        }
    } // end foreach

    return $reloptions;
} // end of 'PMA_foreignDropdownBuild' function

/**
 * Outputs dropdown with values of foreign fields
 *
 * @param   string   the query of the foreign keys
 * @param   string   the foreign field
 * @param   string   the foreign field to display
 * @param   string   the current data of the dropdown
 *
 * @global  array    global phpMyAdmin configuration
 *
 * @return  string   the <option value=""><option>s
 *
 * @access  public
 */
function PMA_foreignDropdown($disp, $foreign_field, $foreign_display, $data, $max) {
    global $cfg;

    // collect the data
    foreach ($disp as $relrow) {
        $key   = $relrow[$foreign_field];

        // if the display field has been defined for this foreign table
        if ($foreign_display) {
            $value  = $relrow[$foreign_display];
        } else {
            $value = '';
        } // end if ($foreign_display)

        $foreign[$key] = $value;
    } // end foreach

    // beginning of dropdown
    $ret = '<option value=""></option>' . "\n";

    // master array for dropdowns
    $reloptions = array('content-id' => array(), 'id-content' => array());

    // sort for id-content 
    if ($cfg['NaturalOrder']) {
        uksort($foreign, 'strnatcasecmp');
    } else {
        ksort($foreign);
    }

    // build id-content dropdown
    $reloptions['id-content'] = PMA_foreignDropdownBuild($foreign, $data, 'id-content');

    // sort for content-id
    if ($cfg['NaturalOrder']) {
        natcasesort($foreign);
    } else {
        asort($foreign);
    }

    // build content-id dropdown
    $reloptions['content-id'] = PMA_foreignDropdownBuild($foreign, $data, 'content-id');


    // put the dropdown sections in correct order 

    $c = count($cfg['ForeignKeyDropdownOrder']);
    if($c == 2) {
        $top = $reloptions[$cfg['ForeignKeyDropdownOrder'][0]];
        $bot = $reloptions[$cfg['ForeignKeyDropdownOrder'][1]];
    } elseif($c == 1) {
        $bot = $reloptions[$cfg['ForeignKeyDropdownOrder'][0]];
        $top = NULL;
    } else {
        $top = $reloptions['id-content'];
        $bot = $reloptions['content-id'];
    }
    $str_bot = implode('', $bot);
    if($top !== NULL) {
        $str_top = implode('', $top);
        $top_count = count($top);
        if ($max == -1 || $top_count < $max) {
            $ret .= $str_top;
            if ($top_count > 0) {
                $ret .= '                <option value=""></option>' . "\n";
                $ret .= '                <option value=""></option>' . "\n";
            }
        }
    }
    $ret .= $str_bot;

    return $ret;
} // end of 'PMA_foreignDropdown()' function

?>

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