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<?php

// Класс для работы с бд

class sql_db
{

    var $db_connect_id;
    var $query_result;
    var $row = array();
    var $rowset = array();
    var $num_queries = 0;
    var $in_transaction = 0;


    // Подключение
    function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)
    {
        $this->persistency = $persistency;
        $this->user = $sqluser;
        $this->password = $sqlpassword;
        $this->server = $sqlserver;
        $this->dbname = $database;

        $this->db_connect_id = ($this->persistency) ? mysql_pconnect($this->server, $this->user, $this->password) : mysql_connect($this->server, $this->user, $this->password);

        if( $this->db_connect_id )
        {
            if( $database != "" )
            {
                $this->dbname = $database;
                $dbselect = mysql_select_db($this->dbname);

                if( !$dbselect )
                {
                    mysql_close($this->db_connect_id);
                    $this->db_connect_id = $dbselect;
                }
            }

            return $this->db_connect_id;
        }
        else
        {
            return false;
        }
    }


    // Закрытие подключения
    function sql_close()
    {
        if( $this->db_connect_id )
        {
            if( $this->in_transaction )
            {
                mysql_query("COMMIT", $this->db_connect_id);
            }

            return mysql_close($this->db_connect_id);
        }
        else
        {
            return false;
        }
    }


    // query
    function sql_query($query = "", $transaction = FALSE)
    {

        unset($this->query_result);

        if( $query != "" )
        {
            $this->num_queries++;
            if( $transaction == "BEGIN_TRANSACTION" && !$this->in_transaction )
            {
                $result = mysql_query("BEGIN", $this->db_connect_id);
                if(!$result)
                {
                    return false;
                }
                $this->in_transaction = TRUE;
            }

            $this->query_result = mysql_query($query, $this->db_connect_id);
        }
        else
        {
            if( $transaction == "END_TRANSACTION" && $this->in_transaction )
            {
                $result = mysql_query("COMMIT", $this->db_connect_id);
            }
        }

        if( $this->query_result )
        {
            unset($this->row[$this->query_result]);
            unset($this->rowset[$this->query_result]);

            if( $transaction == "END_TRANSACTION" && $this->in_transaction )
            {
                $this->in_transaction = FALSE;

                if ( !mysql_query("COMMIT", $this->db_connect_id) )
                {
                    mysql_query("ROLLBACK", $this->db_connect_id);
                    return false;
                }
            }

            return $this->query_result;
        }
        else
        {
            if( $this->in_transaction )
            {
                mysql_query("ROLLBACK", $this->db_connect_id);
                $this->in_transaction = FALSE;
            }
            return false;
        }
    }


    // mysql_num_rows
    function sql_numrows($query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        return ( $query_id ) ? mysql_num_rows($query_id) : false;
    }
   // mysql_affected_rows
    function sql_affectedrows()
    {
        return ( $this->db_connect_id ) ? mysql_affected_rows($this->db_connect_id) : false;
    }
    // mysql_num_fields
    function sql_numfields($query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        return ( $query_id ) ? mysql_num_fields($query_id) : false;
    }
    // mysql_field_name
    function sql_fieldname($offset, $query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        return ( $query_id ) ? mysql_field_name($query_id, $offset) : false;
    }
    // mysql_field_type
    function sql_fieldtype($offset, $query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        return ( $query_id ) ? mysql_field_type($query_id, $offset) : false;
    }
    // sql_fetchrow
    function sql_fetchrow($query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        if( $query_id )
        {
            $this->row[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC);
            return $this->row[$query_id];
        }
        else
        {
            return false;
        }
    }
    // sql_fetchrowset
    function sql_fetchrowset($query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        if( $query_id )
        {
            unset($this->rowset[$query_id]);
            unset($this->row[$query_id]);

            while($this->rowset[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC))
            {
                $result[] = $this->rowset[$query_id];
            }

            return $result;
        }
        else
        {
            return false;
        }
    }


    // mysql_result
    function sql_fetchfield($field, $rownum = -1)
    {


            if( $rownum > -1 )
            {
                $result = mysql_result($field, $rownum);
            }
            else
            {
                if( empty($this->row[$query_id]) && empty($this->rowset[$query_id]) )
                {
                    if( $this->sql_fetchrow() )
                    {
                        $result = $this->row[$query_id][$field];
                    }
                }
                else
                {
                    if( $this->rowset[$query_id] )
                    {
                        $result = $this->rowset[$query_id][0][$field];
                    }
                    else if( $this->row[$query_id] )
                    {
                        $result = $this->row[$query_id][$field];
                    }
                }
            }

            return $result;

    }
    // mysql_data_seek
    function sql_rowseek($rownum, $query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        return ( $query_id ) ? mysql_data_seek($query_id, $rownum) : false;
    }
    // mysql_insert_id
    function sql_nextid()
    {
        return ( $this->db_connect_id ) ? mysql_insert_id($this->db_connect_id) : false;
    }
    // mysql_query
    function sql_freeresult($query_id = 0)
    {
        if( !$query_id )
        {
            $query_id = $this->query_result;
        }

        if ( $query_id )
        {
            unset($this->row[$query_id]);
            unset($this->rowset[$query_id]);

            mysql_free_result($query_id);

            return true;
        }
        else
        {
            return false;
        }
    }
    // mysql_error и mysql_errno
    function sql_error()
    {
        $result['message'] = mysql_error($this->db_connect_id);
        $result['code'] = mysql_errno($this->db_connect_id);

        return $result;
    }

}



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