php的mysql数据库操作类
class dbconn {
var $conn = 0;
function dbconn($dbhost,$dbuser,$dbpw,$dbname){ $this->conn = mysql_connect($dbhost,$dbuser,$dbpw);
!$this->conn && $this->halt("Connect to MySQL failed");
$serverinfo = mysql_get_server_info($this->conn);
if ($serverinfo > '4.1' && $GLOBALS['charset']) {
mysql_query("SET character_set_connection=".$GLOBALS['charset'].",character_set_results=".$GLOBALS['charset'].",character_set_client=binary",$this->conn);
}
if ($serverinfo > '5.0') {
mysql_query("SET sql_mode=''",$this->conn);
}
if ($dbname && !@mysql_select_db($dbname,$this->conn)) {
$this->halt('Cannot use database');
}
}
function select_db($dbname){
if (!@mysql_select_db($dbname,$this->conn)) {
$this->halt('Cannot use database');
}
}
function server_info(){
return mysql_get_server_info($this->conn);
}
function insert_id(){
$arr = $this->fetch_array('SELECT LAST_INSERT_ID() as id');
return $arr["id"];
}
function get_value($SQL,$offset=0,$field=0){
$rt = $this->fetch_all($SQL);
if (isset($rt[$offset][$field])) {
return $rt[$offset][$field];
}
return false;
}
function query($SQL,$method = null,$error = true){
$query = mysql_query($SQL,$this->conn);
!$query && $error && $this->halt('Query Error: '.$SQL);
return $query;
}
function fetch_array($SQL){
$query = $this->query($SQL);
return mysql_fetch_array($query);
}
function fetch_all($SQL) {
$arr = array();
$query = $this->query($SQL);
while($data = mysql_fetch_array($query)) {
$arr[] = $data;
}
return $arr;
}
function affected_rows(){
return mysql_affected_rows($this->conn);
}
function num_rows($SQL){
$query = $this->query($SQL);
if (!is_bool($query)) {
return mysql_num_rows($query);
}
return 0;
}
function num_fields($SQL){
$query = $this->query($SQL);
return mysql_num_fields($query);
}
function escape_string($str){
return mysql_escape_string($str);
}
function free_result(){
$void = func_get_args();
foreach ($void as $query) {
if (is_resource($query) && get_resource_type($query)==='mysql result') {
mysql_free_result($query);
}
}
unset($void);
}
function close(){
$this->free_result();
return @mysql_close($this->conn);
}
function halt($msg=null){
exit($msg.'<br /><br />'.$sql.'<br /> '.mysql_error());
}
}
