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一款简单实用的php操作mysql数据库类_php技巧

时间：2021-07-01 10:21:17 帮助过：4人阅读

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：

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