Odd Promlem releted to querys

[eluser]Unknown[/eluser]
ok i got this modle

Code:

<?php
if (! defined ( 'BASEPATH' ))
    exit ( 'No direct script access allowed' );
if (! defined ( 'tag_sql_enables' )) {
    define ( 'tag_sql_user', '{user}' );
    define ( 'tag_sql_pass', '{pass}' );
    define ( 'tag_sql_email', '{email}' );
    define ( 'tag_sql_fullname', '{fullname}' );
    define ( 'tag_sql_prefix', '{dbPrefix}' );
    define ( 'tag_sql_enables', true );
}
class Sqlinstaller extends Model {
    private $dbFile;
    private $user;
    private $pass;
    private $email;
    private $fullName;
    private $dbPrefix;
    public function __construct() {
        parent::Model ();
        //$this->load->library('database');
        $this->load->database ();
        $this->dbFile = APPPATH . '/models/sqlinstall/dump/db.sql';
    }
    //{dbPrefix},{user},{pass},{email},{fullname}
    public function SetParams($user, $pass, $email, $fullName, $dbPrefix) {
        $this->user = $user;
        $this->pass = dohash ( $pass );
        $this->email = $email;
        $this->fullName = $fullName;
        $this->dbPrefix = $dbPrefix;
    }
    public function LoadDb() {
        $sqlContent = self::_loadDbFile ();
        $returnValue = self::_execSqlContent ( $sqlContent );
        var_dump ( $returnValue );
        return $returnValue;
    }
    
    private function _loadDbFile() {
        $fileContent = "";
        if (file_exists ( $this->dbFile ))
         self::parse_mysql_dump ( $this->dbFile );
        return ($fileContent);
    }
    
    private function _convertSql($fileContent) {
        $fileContent = eregi_replace ( tag_sql_user, $this->user, $fileContent );
        $fileContent = eregi_replace ( tag_sql_pass, $this->pass, $fileContent );
        $fileContent = eregi_replace ( tag_sql_email, $this->email, $fileContent );
        $fileContent = eregi_replace ( tag_sql_fullname, $this->fullName, $fileContent );
        $fileContent = eregi_replace ( tag_sql_prefix, $this->dbPrefix, $fileContent );
        return $fileContent;
    }
    
    private function _execSqlContent($sqlData) {
        $this->db->query ( $sqlData );
        if ($this->db->affected_rows () == 4)
            return true;
        return false;
    }
    private function parse_mysql_dump($url) {
        $handle = @fopen ( $url, "r" );
        $query = "";
        while ( ! feof ( $handle ) ) {
            $sql_line = fgets ( $handle );
            if (trim ( $sql_line ) != "" && strpos ( $sql_line, "--" ) === false) {
                $query .= $sql_line;
                if (preg_match ( "/;[\040]*\$/", $sql_line )) {
                    $query = self::_convertSql ( $query );
                    $result = self::_execSqlContent ( $query );
                    $query = "";
                }
            }
        }
    }
}

?>

when i run the function LoadDb()
i got this error

A Database Error Occurred

The query you submitted is not valid.

but the sql is running

after checked the mysql logs no errors founds if need any file let me know