前端一直使用PHP5，的确使用起来特别的爽，现在为了能在俺的虚拟主机上跑，不得不改成PHP4的。这几个库类我以前发在PHPCHIAN，地址是http://www.phpchina.com/bbs/viewthread.php?tid=5687&highlight=。（前几天在网上搜索了下，发现很多转载我的这几篇文章都没有说明出处，而且把我的版权都删除了，气晕了。）
昨天改写了数据库操作类，恰好在我简化zend Framework也能用到。
代码如下：

<?php
/**
* filename: DB_Mysql.class.php
* @package:phpbean
* @author :feifengxlq<[email][email protected][/email]>
* @copyright :Copyright 2006 feifengxlq
* @license:version 1.2
* create:2006-5-30
* modify:2006-10-19 by feifengxlq
* description:the interface of mysql.
*
* example:
* ////////////Select action (First mode)//////////////////////////////
$mysql=new DB_Mysql("localhost","root","root","root");
$rs=$mysql->query("select * from test");
for($i=0;$i<$mysql->num_rows($rs);$i++)
$record[$i]=$mysql->seek($i);
print_r($record);
$mysql->close();
* ////////////Select action (Second mode)//////////////////////////////
$mysql=new DB_Mysql("localhost","root","root","root");
$rs=$mysql->execute("select * from test");
print_r($rs);
$mysql->close();
* /////////////insert action////////////////////////////
$mysql=new DB_Mysql("localhost","root","root","root");
$mysql->query("insert into test(username) values('test from my DB_mysql')");
printf("%s",$mysql->insert_id());
$mysql->close();
*/
class mysql{
/* private: connection parameters */
var $host="localhost";
var $database="";
var $user="root";
var $password="";
/* private: configuration parameters */
var $pconnect=false;
var $debug=false;
/* private: result array and current row number */
var $link_id=0;
var $query_id=0;
var $record=array();
/**
* construct
*
* @param string $host
* @param string $user
* @param string $password
* @param string $database
*/
function __construct($host="localhost",$user="root",$password="",$database="")
{
$this->set("host",$host);
$this->set("user",$user);
$this->set("password",$password);
$this->set("database",$database);
$this->connect();
}
/**
* set the value for the param of this class
*
* @param string $var
* @param string $value
*/
function set($var,$value)
{
$this->$var=$value;
}

/**
* connect to a mysql server,and choose the database.
*
* @param string $database
* @param string $host
* @param string $user
* @param string $password
* @return link_id
*/
function connect($database="",$host="",$user="",$password="")
{
if(!empty($database))$this->set("database",$database);
if(!empty($host))$this->set("host",$host);
if(!empty($user))$this->set("user",$user);
if(!empty($password))$this->set("password",$password);
if($this->link_id==0)
{
if($this->pconnect)
$this->link_id=@mysql_pconnect($this->host,$this->user,$this->password);
else
$this->link_id=@mysql_connect($this->host,$this->user,$this->password);
if(!$this->link_id)
die("Mysql Connect Error in ".__FUNCTION__."():".mysql_errno().":".mysql_error());
if(!@mysql_select_db($this->database,$this->link_id))
die("Mysql Select database Error in ".__FUNCTION__."():".mysql_errno().":".mysql_error());
}
return $this->link_id;
}
/**
* query a sql into the database
*
* @param string $strsql
* @return query_id
*/
function query($strsql="")
{
if(empty($strsql)) die("Mysql Error:".__FUNCTION__."() strsql is empty!");
if($this->link_id==0) $this->connect();
if($this->debug) printf("Debug query sql:%s",$strsql);
$this->query_id=@mysql_query($strsql,$this->link_id);
if(!$this->query_id) die("Mysql query fail,Invalid sql:".$strsql.".");
return $this->query_id;
}
/**
* query a sql into the database,while it is differernt from the query() method,
* this method will return a record(array);
*
* @param string $strsql
* @param string $style
* @return $record is a array()
*/
function Execute($strsql,$style="array")
{
$this->query($strsql);
if(!empty($this->record))$this->record=array();
$i=0;
if($style=="array"){
while ($temp=@mysql_fetch_array($this->query_id)) {
$this->record[$i]=$temp;
$i++;
}
}else{
while ($temp=@mysql_fetch_object($this->query_id)) {
$this->record[$i]=$temp;
$i++;
}
}
unset($i);
unset($temp);
return $this->record;
}
/**
* seek,but not equal to mysql_data_seek. this methord will return a list.
*
* @param int $pos
* @param string $style
* @return record
*/
function seek($pos=0,$style="array")
{
if(!@mysql_data_seek($this->query_id,$pos))
die("Error in".__FUNCTION__."():can not seek to row ".$pos."!");
$result=@($style=="array")?mysql_fetch_array($this->query_id):mysql_fetch_object($this->query_id);
if(!$result) die("Error in ".__FUNCTION__."():can not fetch data!");
return $result;
}
/**
* free the result of query
*
*/
function free()
{
if(($this->query_id)&($this->query_id!=0))@mysql_free_result($this->query_id);
}
/**
* evaluate the result (size, width)
*
* @return num
*/
function affected_rows()
{
return @mysql_affected_rows($this->link_id);
}
function num_rows()
{
return @mysql_num_rows($this->query_id);
}
function num_fields()
{
return @mysql_num_fields($this->query_id);
}
function insert_id()
{
return @mysql_insert_id($this->link_id);
}
function close()
{
$this->free();
if($this->link_id!=0)@mysql_close($this->link_id);
if(mysql_errno()!=0) die("Mysql Error:".mysql_errno().":".mysql_error());
}
function select($strsql,$number,$offset)
{
if(empty($number)){
return $this->Execute($strsql);
}else{
return $this->Execute($strsql.' limit '.$offset.','.$number);
}
}
function __destruct()
{
$this->close();
$this->set("user","");
$this->set("host","");
$this->set("password","");
$this->set("database","");
}
}
?>

在此基础上，我顺便封装SIDU(select,insert,update,delete)四种基本操作，作为简化的zend Framework的module。代码如下（这个没写注释了，懒的写。。）：

<?
class module{
var $mysql;
var $tbname;
var $debug=false;
function __construct($tbname){
if(!is_string($tbname))die('Module need a args of tablename');
$this->tbname=$tbname;
$this->mysql=phpbean::registry('db');
}
function _setDebug($debug=true){
$this->debug=$debug;
}
function add($row){
if(!is_array($row))die('module error:row should be an array');
$strsql='insert into `'.$this->tbname.'`';
$keys='';
$values='';
foreach($row as $key=>$value){
$keys.='`'.$key.'`,';
$values.='\''.$value.'\'';
}
$keys=rtrim($keys,',');
$values=rtrim($values,',');
$strsql.=' ('.$keys.') values ('.$values.')';
if($this->debug)echo '<hr>'.$strsql.'<hr>';
$this->mysql->query($strsql);
return $this->mysql->insert_id();
}
function query($strsql){
return $this->mysql->Execute($strsql);
}
function count($where=''){
$strsql='select count(*) as num from `'.$this->tbname.'` ';
if(!empty($where))$strsql.=$where;
$rs=$this->mysql->Execute($strsql);
return $rs[0]['num'];
}
function select($where=''){
$strsql='select * from `'.$this->tbname.'` ';
if(!empty($where))$strsql.=$where;
return $this->mysql->Execute($strsql);
}
function delete($where=''){
if(empty($where))die('Error:the delete method need a condition!');
return $this->mysql->query('delete from `'.$this->tbname.'` '.$where);
}
function update($set,$where){
if(empty($where))die('Error:the update method need a condition!');
if(!is_array($set))die('Error:Set must be an array!');
$strsql='update `'.$this->tbname.'` ';
//get a string of set
$strsql.='set ';
foreach($set as $key=>$value){
$strsql.='`'.$key.'`=\''.$value.'\',';
}
$strsql=rtrim($strsql,',');
return $this->mysql->query($strsql.' '.$where);
}
function detail($where){
if(empty($where))die('Error:where should not empty!');
$rs=$this->mysql->query('select * from `'.$this->tbname.'` '.$where);
return $this->mysql->seek(0);
}
}
?>

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