欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

一款简单实用的php操作mysql数据库类

程序员文章站 2023-11-10 21:23:28
本文实例讲述了一款简单实用的php操作mysql数据库类。分享给大家供大家参考。具体如下: 复制代码 代码如下: /* 本款数据库连接类,他会自动加载sql防注入功...

本文实例讲述了一款简单实用的php操作mysql数据库类。分享给大家供大家参考。具体如下:

复制代码 代码如下:

/*
本款数据库连接类,他会自动加载sql防注入功能,过滤一些敏感的sql查询关键词,同时还可以增加判断字段 show table status的性质与show table类 获取数据库所有表名等。*/
@ini_set('mysql.trace_mode','off');
class mysql
{
 public $dblink;
 public $pconnect;
 private $search = array('/union(s*(/*.**/)?s*)+select/i', '/load_file(s*(/*.**/)?s*)+(/i', '/into(s*(/*.**/)?s*)+outfile/i');
 private $replace = array('union   select', 'load_file   (', 'into   outfile');
 private $rs;
 
 function __construct($hostname,$username,$userpwd,$database,$pconnect=false,$charset='utf8')
 {
  define('allowed_htmltags', '<html><embed><title><meta><body><a><p><br><hr><h1><h2><h3><h4><h5><h6><font><u><i><b><strong><div><span><ol><ul><li><img><table><tr><td><map>'); 
  $this->pconnect=$pconnect;
  $this->dblink=$pconnect?mysql_pconnect($hostname,$username,$userpwd):mysql_connect($hostname,$username,$userpwd);
  (!$this->dblink||!is_resource($this->dblink)) && fatal_error("connect to the database unsuccessfully!");
  @mysql_unbuffered_query("set names {$charset}");
  if($this->version()>'5.0.1')
  {
   @mysql_unbuffered_query("set sql_mode = ''");
  }
  @mysql_select_db($database) or fatal_error("can not select table!");
  return $this->dblink;
 }
 
 function query($sql,$unbuffered=false)
 {
  //echo $sql.'<br>';
  $this->rs=$unbuffered?mysql_unbuffered_query($sql,$this->dblink):mysql_query($sql,$this->dblink);
  //(!$this->rs||!is_resource($this->rs)) && fatal_error("execute the query unsuccessfully! error:".mysql_error());
  if(!$this->rs)fatal_error('在执行sql语句 '.$sql.' 时发生以下错误:'.mysql_error());
  return $this->rs;
 }
 
 function fetch_one($sql)
 {
  $this->rs=$this->query($sql);
  return dircms_strips教程lashes($this->filter_pass(mysql_fetch_array($this->rs,mysql_assoc)));
 }
 
 function get_maxfield($filed='id',$table) // 获取$table表中$filed字段的最大值
 {
  $r=$this->fetch_one("select {$table}.{$filed} from `{$table}` order by `{$table}`.`{$filed}` desc limit 0,1");
  return $r[$filed];
 }
 
 function fetch_all($sql)
 {
  $this->rs=$this->query($sql);
  $result=array();
  while($rows=mysql_fetch_array($this->rs,mysql_assoc))
  {
   $result[]=$rows;
  }
  
  mysql_free_result($this->rs);
  return dircms_stripslashes($this->filter_pass($result)); 
 }
 
 function fetch_all_withkey($sql,$key='id')
 {
  $this->rs=$this->query($sql);
  $result=array();
  while($rows=mysql_fetch_array($this->rs,mysql_assoc))
  {
   $result[$rows[$key]]=$rows;
  }
  
  mysql_free_result($this->rs);
  return dircms_stripslashes($this->filter_pass($result)); 
 }
 
 function last_insert_id()
 {
  if(($insertid=mysql_insert_id($this->dblink))>0)return $insertid;
  else //如果 auto_increment 的列的类型是 bigint,则 mysql_insert_id() 返回的值将不正确.
  {
   $result=$this->fetch_one('select last_insert_id() as insertid');
   return $result['insertid'];
  }
 }
 
 function insert($tbname,$varray,$replace=false)
 {
  $varray=$this->escape($varray);
  $tb_fields=$this->get_fields($tbname); // 升级一下,增加判断字段是否存在
  
  foreach($varray as $key => $value)
  {
   if(in_array($key,$tb_fields))
   {
    $fileds[]='`'.$key.'`';
    $values[]=is_string($value)?'''.$value.''':$value;
   }
  }
 
  if($fileds)
  {
   $fileds=implode(',',$fileds);
   $fileds=str_replace(''','`',$fileds);
   $values=implode(',',$values);
   $sql=$replace?"replace into {$tbname}({$fileds}) values ({$values})":"insert into {$tbname}({$fileds}) values ({$values})";
   $this->query($sql,true);
   return $this->last_insert_id();
  }
  else return false;
 }
 
 function update($tbname, $array, $where = '')
 {
  $array=$this->escape($array);
  if($where)
  {
   $tb_fields=$this->get_fields($tbname); // 增加判断字段是否存在
   
   $sql = '';
   foreach($array as $k=>$v)
   {
    if(in_array($k,$tb_fields))
    {
     $k=str_replace(''','',$k);
     $sql .= ", `$k`='$v'";
    }
   }
   $sql = substr($sql, 1);
   
   if($sql)$sql = "update `$tbname` set $sql where $where";
   else return true;
  }
  else
  {
   $sql = "replace into `$tbname`(`".implode('`,`', array_keys($array))."`) values('".implode("','", $array)."')";
  }
  return $this->query($sql,true);
 }
 
 function mysql_delete($tbname,$idarray,$filedname='id')
 {
  $idwhere=is_array($idarray)?implode(',',$idarray):intval($idarray);
  $where=is_array($idarray)?"{$tbname}.{$filedname} in ({$idwhere})":" {$tbname}.{$filedname}={$idwhere}";
 
  return $this->query("delete from {$tbname} where {$where}",true);
 }
 
 function get_fields($table)
 {
  $fields=array();
  $result=$this->fetch_all("show columns from `{$table}`");
  foreach($result as $val)
  {
   $fields[]=$val['field'];
  }
  return $fields;
 }
 
 function get_table_status($database)
 {
  $status=array();
  $r=$this->fetch_all("show table status from `".$database."`"); /////// show table status的性质与show table类似,不过,可以提供每个表的大量信息。
  foreach($r as $v)
  {
   $status[]=$v;
  }
  return $status;
 }
 
 function get_one_table_status($table)
 {
  return $this->fetch_one("show table status like '$table'");
 }
 
 function create_fields($tbname,$fieldname,$size=0,$type='varchar') // 2010-5-14 修正一下
 {  
  if($size)
  {
   $size=strtoupper($type)=='varchar'?$size:8;
   $this->query("alter table `{$tbname}` add `$fieldname` {$type}( {$size} )  not null",true);
  }
  else $this->query("alter table `{$tbname}` add `$fieldname` mediumtext  not null",true);
  return true;
 }
 
 function get_tables() //获取所有表表名
 {
  $tables=array();
  $r=$this->fetch_all("show tables");
  foreach($r as $v)
  {
   foreach($v as $v_)
   {
    $tables[]=$v_;
   }
  }
  return $tables;
 }
 
 function create_model_table($tbname) //创建一个内容模型表(start:初始只有字段contentid int(20),用于内容表,/////////////////////// update:2010-5-20     默认加入`content` mediumtext not null,字段)
 {
  if(in_array($tbname,$this->get_tables())) return false;  ///////////////////// 当表名已经存在时,返回 false
  if($this->query("create table `{$tbname}` (
`contentid` mediumint(8) not null ,
`content` mediumtext not null,
key ( `contentid` ) 
) engine = myisam default charset=utf8",true))return true;   ////////////////////  成功则返回 true
  return false; //////////////失败返回 false
 }
 
 function create_table($tbname) //创建一个会员模型空表(初始只有字段userid int(20),用于会员表,2010-4-26)
 {
  if(in_array($tbname,$this->get_tables())) return false;
  if($this->query("create table `{$tbname}` (
`userid` mediumint(8) not null ,
key ( `userid` ) 
) engine = myisam default charset=utf8",true))return true;
  return false;
 }
 
 function escape($str) // 过滤危险字符
 {
  if(!is_array($str)) return str_replace(array('n', 'r'), array(chr(10), chr(13)),mysql_real_escape_string(preg_replace($this->search,$this->replace, $str), $this->dblink));
  foreach($str as $key=>$val) $str[$key] = $this->escape($val);
  return $str;
 }
 
 function filter_pass($string, $allowedtags = '', $disabledattributes = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavaible', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragdrop', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterupdate', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmoveout', 'onmouseo教程ver', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload'))
 {
  if(is_array($string))
  {
   foreach($string as $key => $val) $string[$key] = $this->filter_pass($val, allowed_htmltags);
  }
  else
  {
   $string = preg_replace('/s('.implode('|', $disabledattributes).').*?([s>])/', '', preg_replace('/<(.*?)>/ie', "'<'.preg_replace(array('/网页特效:[^"']*/i', '/(".implode('|', $disabledattributes).")[ ]*=[ ]*["'][^"']*["']/i', '/s+/'), array('', '', ' '), stripslashes('')) . '>'", strip_tags($string, $allowedtags)));
  }
  return $string;
 }
 
 function drop_table($tbname)
 {
  return $this->query("drop table if exists `{$tbname}`",true);
 }
 
 function version()
 {
  return mysql_get_server_info($this->dblink);
 }
}

希望本文所述对大家的php程序设计有所帮助。