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14. Appendix B SQL abstraction Example

Submitted by: Gianugo Rabellino nemorino@opera.it To get this file, in the web-browser, save this file as 'Text' type as sqlabst.lib

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<?php

/*
*    SAL - SQL Abstraction Library
*           version 0.01
*/

/*
** Set the variable $dbtype to any of the following
** values: MySQL, mSQL, Postgres, ODBC before including this library
*/
// $dbtype = "MySQL"; 
// $dbtype = "mSQL"; 
// $dbtype = "PostgreSQL"; 
// $dbtype = "ODBC"; 

// SQL_connect($host, $user, $password, $db)
// returns the connection ID

function SQL_connect($host, $user, $password, $db)
{
        global $dbtype;

        switch ($dbtype) 
        {
                case  "MySQL":
                        $conn=mysql_pconnect($host, $user, $password);
                        mysql_select_db($db);
                        return $conn;
                        break;;

                case  "mSQL":
                        $conn=msql_pconnect($host);
                        msql_select_db($db);
                        return $conn;
                        break;;

                case  "PostgreSQL":
                        $conn=pg_pconnect($host, "5432", "",$db);
                        return $conn;
                        break;;

                case  "ODBC":
                        $conn=odbc_pconnect($db,$user,$password);
                        return $conn;
                        break;;

                default:
                        $conn=mysql_pconnect($host, $user, $password);
                        mysql_select_db($db);
                        return $conn;
                        break;;
        }
}

// SQL_query($host, $user, $password, $db)
// executes an SQL statement, returns a result identifier
function SQL_query($query, $id)
{
        global $dbtype;
        switch ($dbtype) 
        {
                case  "MySQL":
                        $res=mysql_query($query, $id);
                        return $res;
                        break;;

                case  "mSQL":
                        $res=msql_query($query, $id);
                        return $res;
                        break;;

                case  "PostgreSQL":
                        $res=pg_exec($id,$query);
                        return $res;
                        break;;

                case  "ODBC":
                        $rid=odbc_prepare($id,$query);
                        $res=odbc_execute($rid);
                        return $res;
                        break;;

                default:
                        $res=mysql_query($query, $id);
                        return $res;
                        break;;
        }
}

// SQL_num_rows($host, $user, $password, $db)
// given a result identifier, returns the number of affected rows
function SQL_num_rows($res)
{
        global $dbtype;

        switch ($dbtype) 
        {
                case  "MySQL":
                        $rows=mysql_num_rows($res);
                        return $rows;
                        break;;

                case  "mSQL":
                        $rows=msql_num_rows($res);
                        return $rows;
                        break;;

                case  "PostgreSQL":
                        $rows=pg_numrows($res);
                        return $rows;
                        break;;

                case  "ODBC":
                        $rows=odbc_num_rows($res);
                        return $rows;
                        break;;

                default:
                        $rows=mysql_num_rows($res);
                        return $rows;
                        break;;
        }
}


// SQL_fetchrow($res,$row)
// given a result identifier, returns an array with the resulting row
// Needs also a row number for compatibility with PostgreSQL
function SQL_fetch_row($res, $nr)
{
        global $dbtype;

        switch ($dbtype) 
        {
                case  "MySQL":
                        $row = array();
                        $row = mysql_fetch_row($res);
                        return $row;
                        break;;

                case  "mSQL":
                        $row = array();
                        $row = msql_fetch_row($res);
                        return $row;
                        break;;

                case  "PostgreSQL":
                        $row = array();
                        $row = pg_fetch_row($res,$nr);
                        return $row;
                        break;;

                case  "ODBC":
                        $row = array();
                        $cols = odbc_fetch_into($res, $nr, &$row);
                        return $row;
                        break;;

                default:
                        $row = array();
                        $row = mysql_fetch_row($res);
                        return $row;
                        break;;
        }
}

// SQL_fetch_array($res,$row)
// given a result identifier, returns an associative array
// with the resulting row using field names as keys.
// Needs also a row number for compatibility with PostgreSQL.
function SQL_fetch_array($res, $nr)
{
        global $dbtype;

        switch ($dbtype) 
        {
                case  "MySQL":
                        $row = array();
                        $row = mysql_fetch_array($res);
                        return $row;
                        break;;

                case  "mSQL":
                        $row = array();
                        $row = msql_fetch_array($res);
                        return $row;
                        break;;

                case  "PostgreSQL":
                        $row = array();
                        $row = pg_fetch_array($res,$nr);
                        return $row;
                        break;;

                /*
                * ODBC doesn't have a native _fetch_array(), so we have to
                * use a trick. Beware: this might cause HUGE loads!
                */

                case  "ODBC":
                        $row = array();
                        $result = array();
                        $result = odbc_fetch_row($res, $nr);
                        $nf = count($result)+2;  /* Field numbering starts at 1 */
                        for ($count=1; $count < $nf; $count++) 
                        {
                                $field_name = odbc_field_name($res, $count);
                                $field_value = odbc_result($res, $field_name);
                                $row[$field_name] = $field_value;
                        }
                        return $row;
                        break;;
        }
}

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