Connection sur une b donnée Mysql via odbc

Bonjour à tous,
excuser moi de nous déranger. je n'arrive dans un sript php à me connecter sur une base de donnée Mysql.
je recoit le message suivant :

Warning: SQL error: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified, SQL state IM002 in SQLConnect in e:\easyphp\www\portal_php4t\db_odbc.inc on line 35
Database error: Link-ID == false, odbc_pconnect failed
ODBC Error: 0 ()

j'ai besoin de l'aide s'il vous plait. le fichier db_odbc.inc est le suivant



class DB_Sql {
var $Host = "";
var $Database = "";
var $User = "";
var $Password = "";
var $UseODBCCursor = 0;

var $Link_ID = 0;
var $Query_ID = 0;
var $Record = array();
var $Row = 0;

var $Errno = 0;
var $Error = "";

var $Auto_Free = 0; ## set this to 1 to automatically free results

/* public: constructor */
function DB_Sql($query = "") {
$this->query($query);
}

function connect() {
if ( 0 == $this->Link_ID ) {
$this->Link_ID=odbc_pconnect($this->Database, $this->User, $this->Password, $this->UseODBCCursor);
if (!$this->Link_ID) {
$this->halt("Link-ID == false, odbc_pconnect failed");
}
}
}

function query($Query_String) {

/* No empty queries, please, since PHP4 chokes on them. */
if ($Query_String == "")
/* The empty query string is passed on from the constructor,
* when calling the class without a query, e.g. in situations
* like these: '$db = new DB_Sql_Subclass;'
*/
return 0;

$this->connect();

# printf("<br>Debug: query = %s<br>\n", $Query_String);

# rei@netone.com.br suggested that we use this instead of the odbc_exec().
# He is on NT, connecting to a Unix MySQL server with ODBC. -- KK
# $this->Query_ID = odbc_prepare($this->Link_ID,$Query_String);
# $this->Query_Ok = odbc_execute($this->Query_ID);

$this->Query_ID = odbc_exec($this->Link_ID,$Query_String);
$this->Row = 0;
odbc_binmode($this->Query_ID, 1);
odbc_longreadlen($this->Query_ID, 4096);

if (!$this->Query_ID) {
$this->Errno = 1;
$this->Error = "General Error (The ODBC interface cannot return detailed error messages).";
$this->halt("Invalid SQL: ".$Query_String);
}
return $this->Query_ID;
}

function next_record() {
$this->Record = array();
$stat = odbc_fetch_into($this->Query_ID, ++$this->Row, &$this->Record);
if (!$stat) {
if ($this->Auto_Free) {
odbc_free_result($this->Query_ID);
$this->Query_ID = 0;
};
} else {
// add to Record[<key>]
$count = odbc_num_fields($this->Query_ID);
for ($i=1; $i<=$count; $i++)
$this->Record[strtolower(odbc_field_name ($this->Query_ID, $i)) ] = $this->Record[ $i - 1 ];
}
return $stat;
}

function seek($pos) {
$this->Row = $pos;
}

function metadata($table) {
$count = 0;
$id = 0;
$res = array();

$this->connect();
$id = odbc_exec($this->Link_ID, "select * from $table");
if (!$id) {
$this->Errno = 1;
$this->Error = "General Error (The ODBC interface cannot return detailed error messages).";
$this->halt("Metadata query failed.");
}
$count = odbc_num_fields($id);

for ($i=1; $i<=$count; $i++) {
$res[$i]["table"] = $table;
$name = odbc_field_name ($id, $i);
$res[$i]["name"] = $name;
$res[$i]["type"] = odbc_field_type ($id, $name);
$res[$i]["len"] = 0; // can we determine the width of this column?
$res[$i]["flags"] = ""; // any optional flags to report?
}

odbc_free_result($id);
return $res;
}

function affected_rows() {
return odbc_num_rows($this->Query_ID);
}

function num_rows() {
# Many ODBC drivers don't support odbc_num_rows() on SELECT statements.
$num_rows = odbc_num_rows($this->Query_ID);
//printf ($num_rows."<br>");

# This is a workaround. It is intended to be ugly.
if ($num_rows < 0) {
$i=10;
while (odbc_fetch_row($this->Query_ID, $i))
$i*=10;

$j=0;
while ($i!=$j) {
$k= $j+intval(($i-$j)/2);
if (odbc_fetch_row($this->Query_ID, $k))
$j=$k;
else
$i=$k;
if (($i-$j)==1) {
if (odbc_fetch_row($this->Query_ID, $i))
$j=$i;
else
$i=$j;
};
//printf("$i $j $k <br>");
};
$num_rows=$i;
}

return $num_rows;
}

function num_fields() {
return count($this->Record)/2;
}

function nf() {
return $this->num_rows();
}

function np() {
print $this->num_rows();
}

function f($Field_Name) {
return $this->Record[strtolower($Field_Name)];
}

function p($Field_Name) {
print $this->f($Field_Name);
}

function halt($msg) {
printf("</td></tr></table><b>Database error:</b> %s<br>\n", $msg);
printf("<b>ODBC Error</b>: %s (%s)<br>\n",
$this->Errno,
$this->Error);
die("Session halted.");
}
}
?>

excusez moi une fois de plus pour la longueur et le dérangement