一款实用的php mysql数据库连接类_PHP教程-php教程-PHP中文網

');
  $this->pconnect=$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.'
';
  $this->rs=$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); // mb.bKjia.c0m 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;
}

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_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 drop_table($tbname)
{
return $this->query("drop table if exists `{$tbname}`",true);
}

function version()
{
return mysql_get_server_info($this->dblink);
}
}

一款实用的php mysql数据库连接类_PHP教程

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