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public function Query($sql, $data = array()) {
$sql = $this->query_process($sql, $data);
$this->count_query++;
$this->ResetError();
$this->sql = $sql;
$xtime = microtime();
$this->result = @mysql_query($this->sql, $this->mysql_link);
// start the analysis
if (TRUE === $this->result) { // simply result
$return = TRUE; // successfully (for example: INSERT INTO ...)
} else if (FALSE === $this->result) {
$this->SetError();
$return = FALSE; // error occured (for example: syntax error)
}
else // complex result
{
$num_result = mysql_num_rows($this->result);

switch( $num_result )
{
case 0:
$return = NULL; // return NULL rows
break;
case 1: // return one row ...
if(1 != mysql_num_fields( $this->result))
{
$return = array();
while( $obj = mysql_fetch_object($this->result)) array_push($return, $obj);
}
else
{
$row = mysql_fetch_row($this->result); // or as single value
$return = $row[0];
}
break;
default:
$return = array();
while( $obj = mysql_fetch_object($this->result)) array_push($return, $obj);
}
}
$ytime = microtime();
$this->delta += array_sum(explode(' ',$ytime)) - array_sum(explode(' ',$xtime));

return $return;
}