Mysql类 自己为求方便封装了一下

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############################################################
# What’s this . This is a PHP5 CLASS to provide access utility
# for MySQL database.

# AUTHOR :: Humen1
# WEB SITE :: http://www.humen1.net
# Vision :: 1.0

############################################################

class mydb{
///start of the CLASS
 private $host;
 private $usr;
 private $pwd;
 private $db;
 private $charset = NULL;
 private $charsetArray = Array(“utf8”,“big5”,“gb2312”,“gbk”,“latin1”);
 private $link;
 private $result;
 private $error = Array();
 /**
 #ERROR = Array(
 # [0]=>,
 # 
 # )
 **/
 
 ###construct
 function mydb($DB_host,$DB_user,$DB_passwd,$DB_name = “”){
  $this->host = $DB_host;
  $this->usr = $DB_user;
  $this->pwd = $DB_passwd;
  $this->db = $DB_name;
 }
 
 ###set database name
 function set_db($DB_name){
  $this->db = $DB_name;
 }
 
 ###get connection flag
 function connection(){
  ///get connection
  $this->link = @mysql_connect($this->host,$this->usr,$this->pwd);
  if(!$this->link){
   $this->error[0] = sprintf(“Error connecting to host %s by user %s”, $this->host,$this->usr);
  }
  ///select db
  if(!mysql_select_db($this->db,$this->link)){
   $this->error[1] = sprintf(“Error in selecting %s database.\n mysql errno is %d and error message is %s”,$this->db,mysql_errno($this->link),mysql_error($this->link));
  }
 }
 
 ###set query charset
 function set_charset($Charset){
  if(in_array($Charset,$this->charsetArray)){
   $this->charset = $Charset;
  }
 }
 
 ###Quick execute the statement
 function query($SQL){
  $this->connection();
  if($this->charset !== NULL){
   mysql_query("SET NAMES ".$this->charset , $this->link);
  }
  
  $this->result = mysql_query($SQL , $this->link);
  if(!$this->result){
   $this->error[2] = sprintf(“Error query in %s database.\n mysql errno is %d and error message is %s”,$this->db,mysql_errno($this->link),mysql_error($this->link));
  }else{
   return $this->result;
  }
 }
 
 ###fetch the result as array
 function fetch($result_type = MYSQL_BOTH){
  ///MYSQL_ASSOC,MYSQL_NUM,MYSQL_BOTH
  if($result_type == “1”) $result_type = MYSQL_NUM;
  if($result_type == “A”) $result_type = MYSQL_ASSOC;
  
  if(!$this->result){
   $this->error[3] = “Error fetch array in %s database.There is no Result”;
  }else{
   return mysql_fetch_array($this->result,$result_type);
  }
 }
 
 ###fetch the result as object
 function fetch_obj(){
  return ($this->result) ? @mysql_fetch_object($this->result) : false;
 }
 
 ###return the next id
 function next_id(){
  return ($this->link) ? @mysql_insert_id($this->link) : false;
 }
 
 ###return the affectde rows
 function affected_rows(){
  return ($this->link) ? @mysql_affected_rows($this->link) : false;
 }
 
 ###return the rows number from result
 function num_rows(){
  return ($this->result) ? @mysql_num_rows($this->result) : false;
 }
 
 ###return the fields number from result
 function num_fields(){
  return ($this->result) ? @mysql_num_fields($this->result) : false;
 }
 
 ###free the result
 function free(){
  return ($this->result) ? @mysql_free_result($this->result) : false;
 }

/****************Advanced Plus************************/
 
 ###get one record only
 function getOne($SQL){
  $SQL .= " LIMIT 1";
  $this->query($SQL);
  return ($this->result) ? @mysql_fetch_row($this->result) : false;
 }

///End of the CLASS
}
?>

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