<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Tracking changes on databases, tables and views
 *
 * @package PhpMyAdmin
 */
namespace PMA\libraries;

use PMA\libraries\plugins\export\ExportSql;

/**
 * This class tracks changes on databases, tables and views.
 *
 * @package PhpMyAdmin
 *
 * @todo use stristr instead of strstr
 */
class Tracker
{
    /**
     * Whether tracking is ready.
     */
    static protected $enabled = false;

    /**
     * Cache to avoid quering tracking status multiple times.
     */
    static protected $_tracking_cache = array();

    /**
     * Actually enables tracking. This needs to be done after all
     * underlaying code is initialized.
     *
     * @static
     *
     * @return void
     */
    static public function enable()
    {
        self::$enabled = true;
    }

    /**
     * Gets the on/off value of the Tracker module, starts initialization.
     *
     * @static
     *
     * @return boolean (true=on|false=off)
     */
    static public function isActive()
    {
        if (! self::$enabled) {
            return false;
        }
        /* We need to avoid attempt to track any queries
         * from PMA_getRelationsParam
         */
        self::$enabled = false;
        $cfgRelation = PMA_getRelationsParam();
        /* Restore original state */
        self::$enabled = true;
        if (! $cfgRelation['trackingwork']) {
            return false;
        }

        $pma_table = self::_getTrackingTable();
        if (isset($pma_table)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Parses the name of a table from a SQL statement substring.
     *
     * @param string $string part of SQL statement
     *
     * @static
     *
     * @return string the name of table
     */
    static protected function getTableName($string)
    {
        if (mb_strstr($string, '.')) {
            $temp = explode('.', $string);
            $tablename = $temp[1];
        } else {
            $tablename = $string;
        }

        $str = explode("\n", $tablename);
        $tablename = $str[0];

        $tablename = str_replace(';', '', $tablename);
        $tablename = str_replace('`', '', $tablename);
        $tablename = trim($tablename);

        return $tablename;
    }


    /**
     * Gets the tracking status of a table, is it active or deactive ?
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     *
     * @static
     *
     * @return boolean true or false
     */
    static public function isTracked($dbname, $tablename)
    {
        if (! self::$enabled) {
            return false;
        }

        if (isset(self::$_tracking_cache[$dbname][$tablename])) {
            return self::$_tracking_cache[$dbname][$tablename];
        }
        /* We need to avoid attempt to track any queries
         * from PMA_getRelationsParam
         */
        self::$enabled = false;
        $cfgRelation = PMA_getRelationsParam();
        /* Restore original state */
        self::$enabled = true;
        if (! $cfgRelation['trackingwork']) {
            return false;
        }

        $sql_query = " SELECT tracking_active FROM " . self::_getTrackingTable() .
        " WHERE db_name = '" . $GLOBALS['dbi']->escapeString($dbname) . "' " .
        " AND table_name = '" . $GLOBALS['dbi']->escapeString($tablename) . "' " .
        " ORDER BY version DESC LIMIT 1";

        $result = $GLOBALS['dbi']->fetchValue($sql_query, 0, 0, $GLOBALS['controllink']) == 1;

        self::$_tracking_cache[$dbname][$tablename] = $result;

        return $result;
    }

    /**
     * Returns the comment line for the log.
     *
     * @return string Comment, contains date and username
     */
    static public function getLogComment()
    {
        $date = date('Y-m-d H:i:s');
        $user = preg_replace('/\s+/', ' ', $GLOBALS['cfg']['Server']['user']);

        return "# log " . $date . " " . $user . "\n";
    }

    /**
     * Creates tracking version of a table / view
     * (in other words: create a job to track future changes on the table).
     *
     * @param string $dbname       name of database
     * @param string $tablename    name of table
     * @param string $version      version
     * @param string $tracking_set set of tracking statements
     * @param bool   $is_view      if table is a view
     *
     * @static
     *
     * @return int result of version insertion
     */
    static public function createVersion($dbname, $tablename, $version,
        $tracking_set = '', $is_view = false
    ) {
        global $sql_backquotes, $export_type;

        if ($tracking_set == '') {
            $tracking_set
                = $GLOBALS['cfg']['Server']['tracking_default_statements'];
        }

        // get Export SQL instance
        include_once "libraries/plugin_interface.lib.php";
        /* @var $export_sql_plugin \PMA\libraries\plugins\export\ExportSql */
        $export_sql_plugin = PMA_getPlugin(
            "export",
            "sql",
            'libraries/plugins/export/',
            array(
                'export_type' => $export_type,
                'single_table' => false,
            )
        );

        $sql_backquotes = true;

        $date = date('Y-m-d H:i:s');

        // Get data definition snapshot of table

        $columns = $GLOBALS['dbi']->getColumns($dbname, $tablename, null, true);
        // int indices to reduce size
        $columns = array_values($columns);
        // remove Privileges to reduce size
        for ($i = 0, $nb = count($columns); $i < $nb; $i++) {
            unset($columns[$i]['Privileges']);
        }

        $indexes = $GLOBALS['dbi']->getTableIndexes($dbname, $tablename);

        $snapshot = array('COLUMNS' => $columns, 'INDEXES' => $indexes);
        $snapshot = serialize($snapshot);

        // Get DROP TABLE / DROP VIEW and CREATE TABLE SQL statements
        $sql_backquotes = true;

        $create_sql  = "";

        if ($GLOBALS['cfg']['Server']['tracking_add_drop_table'] == true
            && $is_view == false
        ) {
            $create_sql .= self::getLogComment()
                . 'DROP TABLE IF EXISTS ' . Util::backquote($tablename) . ";\n";

        }

        if ($GLOBALS['cfg']['Server']['tracking_add_drop_view'] == true
            && $is_view == true
        ) {
            $create_sql .= self::getLogComment()
                . 'DROP VIEW IF EXISTS ' . Util::backquote($tablename) . ";\n";
        }

        $create_sql .= self::getLogComment() .
            $export_sql_plugin->getTableDef($dbname, $tablename, "\n", "");

        // Save version

        $sql_query = "/*NOTRACK*/\n" .
        "INSERT INTO " . self::_getTrackingTable() . " (" .
        "db_name, " .
        "table_name, " .
        "version, " .
        "date_created, " .
        "date_updated, " .
        "schema_snapshot, " .
        "schema_sql, " .
        "data_sql, " .
        "tracking " .
        ") " .
        "values (
        '" . $GLOBALS['dbi']->escapeString($dbname) . "',
        '" . $GLOBALS['dbi']->escapeString($tablename) . "',
        '" . $GLOBALS['dbi']->escapeString($version) . "',
        '" . $GLOBALS['dbi']->escapeString($date) . "',
        '" . $GLOBALS['dbi']->escapeString($date) . "',
        '" . $GLOBALS['dbi']->escapeString($snapshot) . "',
        '" . $GLOBALS['dbi']->escapeString($create_sql) . "',
        '" . $GLOBALS['dbi']->escapeString("\n") . "',
        '" . $GLOBALS['dbi']->escapeString($tracking_set)
        . "' )";

        $result = PMA_queryAsControlUser($sql_query);

        if ($result) {
            // Deactivate previous version
            self::deactivateTracking($dbname, $tablename, ($version - 1));
        }

        return $result;
    }


    /**
     * Removes all tracking data for a table or a version of a table
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     * @param string $version   version
     *
     * @static
     *
     * @return int result of version insertion
     */
    static public function deleteTracking($dbname, $tablename, $version = '')
    {
        $sql_query = "/*NOTRACK*/\n"
            . "DELETE FROM " . self::_getTrackingTable()
            . " WHERE `db_name` = '"
            . $GLOBALS['dbi']->escapeString($dbname) . "'"
            . " AND `table_name` = '"
            . $GLOBALS['dbi']->escapeString($tablename) . "'";
        if ($version) {
            $sql_query .= " AND `version` = '"
                . $GLOBALS['dbi']->escapeString($version) . "'";
        }
        $result = PMA_queryAsControlUser($sql_query);

        return $result;
    }

    /**
     * Creates tracking version of a database
     * (in other words: create a job to track future changes on the database).
     *
     * @param string $dbname       name of database
     * @param string $version      version
     * @param string $query        query
     * @param string $tracking_set set of tracking statements
     *
     * @static
     *
     * @return int result of version insertion
     */
    static public function createDatabaseVersion($dbname, $version, $query,
        $tracking_set = 'CREATE DATABASE,ALTER DATABASE,DROP DATABASE'
    ) {
        $date = date('Y-m-d H:i:s');

        if ($tracking_set == '') {
            $tracking_set
                = $GLOBALS['cfg']['Server']['tracking_default_statements'];
        }

        $create_sql  = "";

        if ($GLOBALS['cfg']['Server']['tracking_add_drop_database'] == true) {
            $create_sql .= self::getLogComment()
                . 'DROP DATABASE IF EXISTS ' . Util::backquote($dbname) . ";\n";
        }

        $create_sql .= self::getLogComment() . $query;

        // Save version
        $sql_query = "/*NOTRACK*/\n" .
        "INSERT INTO " . self::_getTrackingTable() . " (" .
        "db_name, " .
        "table_name, " .
        "version, " .
        "date_created, " .
        "date_updated, " .
        "schema_snapshot, " .
        "schema_sql, " .
        "data_sql, " .
        "tracking " .
        ") " .
        "values (
        '" . $GLOBALS['dbi']->escapeString($dbname) . "',
        '" . $GLOBALS['dbi']->escapeString('') . "',
        '" . $GLOBALS['dbi']->escapeString($version) . "',
        '" . $GLOBALS['dbi']->escapeString($date) . "',
        '" . $GLOBALS['dbi']->escapeString($date) . "',
        '" . $GLOBALS['dbi']->escapeString('') . "',
        '" . $GLOBALS['dbi']->escapeString($create_sql) . "',
        '" . $GLOBALS['dbi']->escapeString("\n") . "',
        '" . $GLOBALS['dbi']->escapeString($tracking_set)
        . "' )";

        $result = PMA_queryAsControlUser($sql_query);

        return $result;
    }



    /**
     * Changes tracking of a table.
     *
     * @param string  $dbname    name of database
     * @param string  $tablename name of table
     * @param string  $version   version
     * @param integer $new_state the new state of tracking
     *
     * @static
     *
     * @return int result of SQL query
     */
    static private function _changeTracking($dbname, $tablename,
        $version, $new_state
    ) {

        $sql_query = " UPDATE " . self::_getTrackingTable() .
        " SET `tracking_active` = '" . $new_state . "' " .
        " WHERE `db_name` = '" . $GLOBALS['dbi']->escapeString($dbname) . "' " .
        " AND `table_name` = '" . $GLOBALS['dbi']->escapeString($tablename) . "' " .
        " AND `version` = '" . $GLOBALS['dbi']->escapeString($version) . "' ";

        $result = PMA_queryAsControlUser($sql_query);

        return $result;
    }

    /**
     * Changes tracking data of a table.
     *
     * @param string       $dbname    name of database
     * @param string       $tablename name of table
     * @param string       $version   version
     * @param string       $type      type of data(DDL || DML)
     * @param string|array $new_data  the new tracking data
     *
     * @static
     *
     * @return bool result of change
     */
    static public function changeTrackingData($dbname, $tablename,
        $version, $type, $new_data
    ) {
        if ($type == 'DDL') {
            $save_to = 'schema_sql';
        } elseif ($type == 'DML') {
            $save_to = 'data_sql';
        } else {
            return false;
        }
        $date  = date('Y-m-d H:i:s');

        $new_data_processed = '';
        if (is_array($new_data)) {
            foreach ($new_data as $data) {
                $new_data_processed .= '# log ' . $date . ' ' . $data['username']
                    . $GLOBALS['dbi']->escapeString($data['statement']) . "\n";
            }
        } else {
            $new_data_processed = $new_data;
        }

        $sql_query = " UPDATE " . self::_getTrackingTable() .
        " SET `" . $save_to . "` = '" . $new_data_processed . "' " .
        " WHERE `db_name` = '" . $GLOBALS['dbi']->escapeString($dbname) . "' " .
        " AND `table_name` = '" . $GLOBALS['dbi']->escapeString($tablename) . "' " .
        " AND `version` = '" . $GLOBALS['dbi']->escapeString($version) . "' ";

        $result = PMA_queryAsControlUser($sql_query);

        return (boolean) $result;
    }

    /**
     * Activates tracking of a table.
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     * @param string $version   version
     *
     * @static
     *
     * @return int result of SQL query
     */
    static public function activateTracking($dbname, $tablename, $version)
    {
        return self::_changeTracking($dbname, $tablename, $version, 1);
    }


    /**
     * Deactivates tracking of a table.
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     * @param string $version   version
     *
     * @static
     *
     * @return int result of SQL query
     */
    static public function deactivateTracking($dbname, $tablename, $version)
    {
        return self::_changeTracking($dbname, $tablename, $version, 0);
    }


    /**
     * Gets the newest version of a tracking job
     * (in other words: gets the HEAD version).
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     * @param string $statement tracked statement
     *
     * @static
     *
     * @return int (-1 if no version exists | >  0 if a version exists)
     */
    static public function getVersion($dbname, $tablename, $statement = null)
    {
        $sql_query = " SELECT MAX(version) FROM " . self::_getTrackingTable() .
        " WHERE `db_name` = '" . $GLOBALS['dbi']->escapeString($dbname) . "' " .
        " AND `table_name` = '" . $GLOBALS['dbi']->escapeString($tablename) . "' ";

        if ($statement != "") {
            $sql_query .= " AND FIND_IN_SET('"
                . $statement . "',tracking) > 0" ;
        }
        $row = $GLOBALS['dbi']->fetchArray(PMA_queryAsControlUser($sql_query));
        return isset($row[0])
            ? $row[0]
            : -1;
    }


    /**
     * Gets the record of a tracking job.
     *
     * @param string $dbname    name of database
     * @param string $tablename name of table
     * @param string $version   version number
     *
     * @static
     *
     * @return mixed record DDM log, DDL log, structure snapshot, tracked
     *         statements.
     */
    static public function getTrackedData($dbname, $tablename, $version)
    {
        $sql_query = " SELECT * FROM " . self::_getTrackingTable() .
            " WHERE `db_name` = '" . $GLOBALS['dbi']->escapeString($dbname) . "' ";
        if (! empty($tablename)) {
            $sql_query .= " AND `table_name` = '"
                . $GLOBALS['dbi']->escapeString($tablename) . "' ";
        }
        $sql_query .= " AND `version` = '" . $GLOBALS['dbi']->escapeString($version)
            . "' " . " ORDER BY `version` DESC LIMIT 1";

        $mixed = $GLOBALS['dbi']->fetchAssoc(PMA_queryAsControlUser($sql_query));

        // Parse log
        $log_schema_entries = explode('# log ',  $mixed['schema_sql']);
        $log_data_entries   = explode('# log ',  $mixed['data_sql']);

        $ddl_date_from = $date = date('Y-m-d H:i:s');

        $ddlog = array();
        $first_iteration = true;

        // Iterate tracked data definition statements
        // For each log entry we want to get date, username and statement
        foreach ($log_schema_entries as $log_entry) {
            if (trim($log_entry) != '') {
                $date      = mb_substr($log_entry, 0, 19);
                $username  = mb_substr(
                    $log_entry, 20, mb_strpos($log_entry, "\n") - 20
                );
                if ($first_iteration) {
                    $ddl_date_from = $date;
                    $first_iteration = false;
                }
                $statement = rtrim(mb_strstr($log_entry, "\n"));

                $ddlog[] = array( 'date' => $date,
                                  'username'=> $username,
                                  'statement' => $statement );
            }
        }

        $date_from = $ddl_date_from;
        $ddl_date_to = $date;

        $dml_date_from = $date_from;

        $dmlog = array();
        $first_iteration = true;

        // Iterate tracked data manipulation statements
        // For each log entry we want to get date, username and statement
        foreach ($log_data_entries as $log_entry) {
            if (trim($log_entry) != '') {
                $date      = mb_substr($log_entry, 0, 19);
                $username  = mb_substr(
                    $log_entry, 20, mb_strpos($log_entry, "\n") - 20
                );
                if ($first_iteration) {
                    $dml_date_from = $date;
                    $first_iteration = false;
                }
                $statement = rtrim(mb_strstr($log_entry, "\n"));

                $dmlog[] = array( 'date' => $date,
                                  'username' => $username,
                                  'statement' => $statement );
            }
        }

        $dml_date_to = $date;

        // Define begin and end of date range for both logs
        $data = array();
        if (strtotime($ddl_date_from) <= strtotime($dml_date_from)) {
            $data['date_from'] = $ddl_date_from;
        } else {
            $data['date_from'] = $dml_date_from;
        }
        if (strtotime($ddl_date_to) >= strtotime($dml_date_to)) {
            $data['date_to'] = $ddl_date_to;
        } else {
            $data['date_to'] = $dml_date_to;
        }
        $data['ddlog']           = $ddlog;
        $data['dmlog']           = $dmlog;
        $data['tracking']        = $mixed['tracking'];
        $data['schema_snapshot'] = $mixed['schema_snapshot'];

        return $data;
    }


    /**
     * Parses a query. Gets
     *  - statement identifier (UPDATE, ALTER TABLE, ...)
     *  - type of statement, is it part of DDL or DML ?
     *  - tablename
     *
     * @param string $query query
     *
     * @static
     * @todo: using PMA SQL Parser when possible
     * @todo: support multi-table/view drops
     *
     * @return mixed Array containing identifier, type and tablename.
     *
     */
    static public function parseQuery($query)
    {
        // Usage of PMA_SQP does not work here
        //
        // require_once("libraries/sqlparser.lib.php");
        // $parsed_sql = PMA_SQP_parse($query);
        // $sql_info = PMA_SQP_analyze($parsed_sql);

        $parser = new \PhpMyAdmin\SqlParser\Parser($query);

        $tokens = $parser->list->tokens;

        // Parse USE statement, need it for SQL dump imports
        if ($tokens[0]->value == 'USE') {
            $GLOBALS['db'] = $tokens[2]->value;
        }

        $result = array();

        if (!empty($parser->statements)) {
            $statement = $parser->statements[0];
            $options   = isset($statement->options) ? $statement->options->options : null;

            /*
             * DDL statements
             */
            $result['type'] = 'DDL';

            // Parse CREATE statement
            if ($statement instanceof \PhpMyAdmin\SqlParser\Statements\CreateStatement) {
                if (empty($options) || !isset($options[6])) {
                    return $result;
                }

                if ($options[6] == 'VIEW' || $options[6] == 'TABLE') {
                    $result['identifier'] = 'CREATE ' . $options[6];
                    $result['tablename']  = $statement->name->table ;
                } elseif ($options[6] == 'DATABASE') {
                    $result['identifier'] = 'CREATE DATABASE' ;
                    $result['tablename']  = '' ;

                    // In case of CREATE DATABASE, table field of the CreateStatement is actually name of the database
                    $GLOBALS['db']        = $statement->name->table;
                } elseif ($options[6] == 'INDEX'
                          || $options[6] == 'UNIQUE INDEX'
                          || $options[6] == 'FULLTEXT INDEX'
                          || $options[6] == 'SPATIAL INDEX'
                ){
                    $result['identifier'] = 'CREATE INDEX';

                    // In case of CREATE INDEX, we have to get the table name from body of the statement
                    $result['tablename']  = $statement->body[3]->value == '.' ? $statement->body[4]->value
                                                                              : $statement->body[2]->value ;
                }
            }

            // Parse ALTER statement
            elseif ($statement instanceof \PhpMyAdmin\SqlParser\Statements\AlterStatement) {
                if (empty($options) || !isset($options[3])) {
                    return $result;
                }

                if ($options[3] == 'VIEW' || $options[3] == 'TABLE') {
                    $result['identifier']   = 'ALTER ' . $options[3] ;
                    $result['tablename']    = $statement->table->table ;
                } elseif ($options[3] == 'DATABASE') {
                    $result['identifier']   = 'ALTER DATABASE' ;
                    $result['tablename']    = '' ;

                    $GLOBALS['db']          = $statement->table->table ;
                }
            }

            // Parse DROP statement
            elseif ($statement instanceof \PhpMyAdmin\SqlParser\Statements\DropStatement) {
                if (empty($options) || !isset($options[1])) {
                    return $result;
                }

                if ($options[1] == 'VIEW' || $options[1] == 'TABLE') {
                    $result['identifier'] = 'DROP ' . $options[1] ;
                    $result['tablename']  = $statement->fields[0]->table;
                } elseif ($options[1] == 'DATABASE') {
                    $result['identifier'] = 'DROP DATABASE' ;
                    $result['tablename']  = '';

                    $GLOBALS['db']        = $statement->fields[0]->table;
                } elseif ($options[1] == 'INDEX') {
                    $result['identifier']   = 'DROP INDEX' ;
                    $result['tablename']    = $statement->table->table;
                }
            }

            // Prase RENAME statement
            elseif ($statement instanceof \PhpMyAdmin\SqlParser\Statements\RenameStatement) {
                $result['identifier']               = 'RENAME TABLE';
                $result['tablename']                = $statement->renames[0]->old->table;
                $result['tablename_after_rename']   = $statement->renames[0]->new->table;
            }

            if (isset($result['identifier'])) {
                return $result ;
            }

            /*
             * DML statements
             */
            $result['type'] = 'DML';

            // Parse UPDATE statement
            if ($statement instanceof \PhpMyAdmin\SqlParser\Statements\UpdateStatement) {
                $result['identifier']   = 'UPDATE';
                $result['tablename']    = $statement->tables[0]->table;
            }

            // Parse INSERT INTO statement
            if ($statement instanceof \PhpMyAdmin\SqlParser\Statements\InsertStatement) {
                $result['identifier']   = 'INSERT';
                $result['tablename']    = $statement->into->dest->table;
            }

            // Parse DELETE statement
            if ($statement instanceof \PhpMyAdmin\SqlParser\Statements\DeleteStatement) {
                $result['identifier']   = 'DELETE';
                $result['tablename']    = $statement->from[0]->table;
            }

            // Parse TRUNCATE statement
            if ($statement instanceof \PhpMyAdmin\SqlParser\Statements\TruncateStatement) {
                $result['identifier']   = 'TRUNCATE' ;
                $result['tablename']    = $statement->table->table;
            }
        }

        return $result;
    }


    /**
     * Analyzes a given SQL statement and saves tracking data.
     *
     * @param string $query a SQL query
     *
     * @static
     *
     * @return void
     */
    static public function handleQuery($query)
    {
        // If query is marked as untouchable, leave
        if (mb_strstr($query, "/*NOTRACK*/")) {
            return;
        }

        if (! (substr($query, -1) == ';')) {
            $query = $query . ";\n";
        }
        // Get some information about query
        $result = self::parseQuery($query);

        // Get database name
        $dbname = trim(isset($GLOBALS['db']) ? $GLOBALS['db'] : '', '`');
        // $dbname can be empty, for example when coming from Synchronize
        // and this is a query for the remote server
        if (empty($dbname)) {
            return;
        }

        // If we found a valid statement
        if (isset($result['identifier'])) {
            if (! self::isTracked($dbname, $result['tablename'])) {
                return;
            }

            $version = self::getVersion(
                $dbname, $result['tablename'], $result['identifier']
            );

            // If version not exists and auto-creation is enabled
            if ($GLOBALS['cfg']['Server']['tracking_version_auto_create'] == true
                && $version == -1
            ) {
                // Create the version

                switch ($result['identifier']) {
                case 'CREATE TABLE':
                    self::createVersion($dbname, $result['tablename'], '1');
                    break;
                case 'CREATE VIEW':
                    self::createVersion(
                        $dbname, $result['tablename'], '1', '', true
                    );
                    break;
                case 'CREATE DATABASE':
                    self::createDatabaseVersion($dbname, '1', $query);
                    break;
                } // end switch
            }

            // If version exists
            if ($version != -1) {
                if ($result['type'] == 'DDL') {
                    $save_to = 'schema_sql';
                } elseif ($result['type'] == 'DML') {
                    $save_to = 'data_sql';
                } else {
                    $save_to = '';
                }
                $date  = date('Y-m-d H:i:s');

                // Cut off `dbname`. from query
                $query = preg_replace(
                    '/`' . preg_quote($dbname, '/') . '`\s?\./',
                    '',
                    $query
                );

                // Add log information
                $query = self::getLogComment() . $query ;

                // Mark it as untouchable
                $sql_query = " /*NOTRACK*/\n"
                    . " UPDATE " . self::_getTrackingTable()
                    . " SET " . Util::backquote($save_to)
                    . " = CONCAT( " . Util::backquote($save_to) . ",'\n"
                    . $GLOBALS['dbi']->escapeString($query) . "') ,"
                    . " `date_updated` = '" . $date . "' ";

                // If table was renamed we have to change
                // the tablename attribute in pma_tracking too
                if ($result['identifier'] == 'RENAME TABLE') {
                    $sql_query .= ', `table_name` = \''
                        . $GLOBALS['dbi']->escapeString($result['tablename_after_rename'])
                        . '\' ';
                }

                // Save the tracking information only for
                //     1. the database
                //     2. the table / view
                //     3. the statements
                // we want to track
                $sql_query .=
                " WHERE FIND_IN_SET('" . $result['identifier'] . "',tracking) > 0" .
                " AND `db_name` = '" . $GLOBALS['dbi']->escapeString($dbname) . "' " .
                " AND `table_name` = '"
                . $GLOBALS['dbi']->escapeString($result['tablename']) . "' " .
                " AND `version` = '" . $GLOBALS['dbi']->escapeString($version) . "' ";

                PMA_queryAsControlUser($sql_query);
            }
        }
    }

    /**
     * Returns the tracking table
     *
     * @return string tracking table
     */
    private static function _getTrackingTable()
    {
        $cfgRelation = PMA_getRelationsParam();
        return Util::backquote($cfgRelation['db'])
            . '.' . Util::backquote($cfgRelation['tracking']);
    }
}
