class MySQL_class {
var $db, $id, $result, $rows, $data, $a_rows;
var $user, $pass, $host;

/* Make sure you change the USERNAME and PASSWORD to your name and
* password for the DB
*/

function Setup ($user, $pass) {
$this->user = $user;
$this->pass = $pass;
}

function Create ($db) {
if (!$this->user) {
$this->user = "USERNAME"; /* 在这里作修改 */
}
if (!$this->pass) {
$this->pass = "PASSWORD"; /* 在这里作修改 */
}
$this->db = $db;
$this->id = @mysql_pconnect($this->host, $this->user, $this->pass) or
MySQL_ErrorMsg("Unable to connect to MySQL server: $this->host : '$SERVER_NAME'");
$this->selectdb($db);
}

function SelectDB ($db) {
@mysql_select_db($db, $this->id) or
MySQL_ErrorMsg ("Unable to select database: $db");
}

# Use this function is the query will return multiple rows. Use the Fetch
# routine to loop through those rows.
function Query ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform query: $query");
$this->rows = @mysql_num_rows($this->result);
$this->a_rows = @mysql_affected_rows($this->result);
}

# Use this function if the query will only return a
# single data element.
function QueryItem ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform query: $query");
$this->rows = @mysql_num_rows($this->result);
$this->a_rows = @mysql_affected_rows($this->result);
$this->data = @mysql_fetch_array($this->result) or
MySQL_ErrorMsg ("Unable to fetch data from query: $query");
return($this->data[0]);
}

# This function is useful if the query will only return a
# single row.
function QueryRow ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform query: $query");
$this->rows = @mysql_num_rows($this->result);
$this->a_rows = @mysql_affected_rows($this->result);
$this->data = @mysql_fetch_array($this->result) or
MySQL_ErrorMsg ("Unable to fetch data from query: $query");
return($this->data);
}

function Fetch ($row) {
@mysql_data_seek($this->result, $row) or
MySQL_ErrorMsg ("Unable to seek data row: $row");
$this->data = @mysql_fetch_array($this->result) or
MySQL_ErrorMsg ("Unable to fetch row: $row");
}

function Insert ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform insert: $query");
$this->a_rows = @mysql_affected_rows($this->result);
}

function Update ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform update: $query");
$this->a_rows = @mysql_affected_rows($this->result);
}

function Delete ($query) {
$this->result = @mysql_query($query, $this->id) or
MySQL_ErrorMsg ("Unable to perform Delete: $query");
$this->a_rows = @mysql_affected_rows($this->result);
}
}

/* ********************************************************************
* MySQL_ErrorMsg
*
* Print out an MySQL error message
*
*/

function MySQL_ErrorMsg ($msg) {
# Close out a bunch of HTML constructs which might prevent
# the HTML page from displaying the error text.
echo("</ul></dl></ol>n");
echo("</table></script>n");

# Display the error message
$text = "<font color="#ff0000" size=+2><p>Error: $msg :";
$text .= mysql_error();
$text .= "</font>n";
die($text);
}
?>

原作者：不详
来源：中国PHP自由联盟

（出处：）