[转] 转一个SQL Ralay数据库连接池的PHP操作类

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　　转一个由于 秋衫客的一亩三分地上看的一个由秋衫客写的SQL Ralay数据库连接池的PHP操作类，给那些想利用SQL Ralay 做连接池的同志们。（好像只支持Sybase，不过应该很简单的就能够支持Mysql、Oracle等）
关于SQL Relay的介绍看这里：http://blog.csdn.net/heiyeshuwu/archive/2006/05/17/743303.aspx
　　原文链接：http://tobylee.cnblogs.com/archive/2006/02/15/330999.html
数据库类下载：http://www.cnblogs.com/Files/tobylee/sqlr.rar
　　原文说明：目前此类只支持Sybase，稍加扩展就可以同时支持其它多种数据库，功能还不完善，但是基本上够用
，另外，还没有写说明文档，先放上来，有需要的朋友可以拿去看看，需要SQL Relay支持哦。
【操作类代码】
　　// pdbconn.inc.php

　　<?php
/**
* 全局常量定义
*
*/
define("SYBASE", 0);
define("ORACLE", 1);
define("SUCCESS", 1);
define("FAILED", -1);

define("DEBUG", 1);

/**
* 数据库连接类
* 开始于：2006年1月10日
* 作者：秋衫客 (cntoby@gmail.com)
*
* 功能描述：数据库查询及连接池维护
* 暂时不支持ORACLE
*/
class dbconn {
var $_conn;// 当前连接ID
var $_cur;//
var $_dbhost = "localhost";// 数据库服务器名
var $_dbport = 9000;// 数据库端口号
var $_dbuser = "dev";// 登录数据库的用户名
var $_dbpass = "dev";// 登录数据库的密码
var $_dbsock = "null"; // 数据库连接的Unix套接字
var $_dbflag = SYBASE;// 数据库类型
var $_dbflagS = "sybase";// SQLRelay中数据库类型标志
var $_dbrtrt = 0;// 连接失败后间接多长时间重试
var $_dbtries = 1;// 重试次数
var $_debug = false;// 是否为DEBUG模式
var $_cursql = "";// 当前存在的SQL文
var $_lastrt = true;// 最后一次执行的结果，成功与否boolean
var $_queryrs = null;// 查询过程中的结果
var $rs = null;// 最后一次执行结果
var $recordcount = 0;// 当次返回记录总数
var $absolute = 0;// 当前页码
var $pagesize = 0;// 每页显示记录数
var $pagecount = 1;// 本次查询总页数
var $total = 0;// 总记录数

/**
* 构造函数，在本函数内初始化连接及连接池
* 构造函数的参数说明：
*不用任何参数可使用默认参数连接数据库
*当使用参数时，可以使用1到5个参数，顺序为
*dbhost数据库服务器名
*dbuser登录数据库用户名
*dbpass登录数据库密码
*dbsock数据库连接的Unix套接字
*dbport数据库端口号
*dbflag数据库类型，可选类型为SYBASE或ORACLE
*
* @return dbconn
*/
function dbconn() {
$argc = func_num_args();
$argv = func_get_args();
$this->_dbhost = (!empty($argv[0]))?$argv[0]:$this->_dbhost;
$this->_dbuser = (!empty($argv[1]))?$argv[1]:$this->_dbuser;
$this->_dbpass = (!empty($argv[2]))?$argv[2]:$this->_dbpass;
$this->_dbsock = (!empty($argv[3]))?$argv[3]:$this->_dbsock;
$this->_dbport = (!empty($argv[4]))?$argv[4]:$this->_dbport;
$this->_dbflag = (!empty($argv[5]))?$argv[5]:$this->_dbflag;
$this->_dbrtrt = (!empty($argv[6]))?$argv[6]:$this->_dbrtrt;
$this->_dbtries = (!empty($argv[7]))?$argv[7]:$this->_dbtries;
$this->_debug = defined("DEBUG");

switch ($this->_dbflag) {
case SYBASE:
$this->_conn = @sqlrcon_alloc($this->_dbhost, $this->_dbport, $this->_dbsock, $this->_dbuser, $this->_dbpass, $this->_dbrtrt, $this->_dbtries);
$this->_cur = @sqlrcur_alloc($this->_conn);
if(@sqlrcon_identify($this->_conn)!="sybase"||@sqlrcon_ping($this->_conn)!=1) {
return FAILED;
}
break;
case ORACLE:
$this->_conn = @sqlrcon_alloc($this->_dbhost, $this->_dbport, $this->_dbsock, $this->_dbuser, $this->_dbpass, $this->_dbrtrt, $this->_dbtries);
$this->_cur = @sqlrcur_alloc($this->_conn);
if(substring(@sqlrcon_identify($this->_conn), 0, 6)!="oracle"||@sqlrcon_ping($this->_conn)!=1) {
return FAILED;
}
break;
default:
return FAILED;
break;
}
}

/**
* 设置用于查询的SQL文
*
* @param string $sql
*/
function setsql($sql = "") {
$this->_cursql = $sql;
return SUCCESS;
}

/**
* 重置到初始状态
*
* @return bool
*/
function rset() {
$this->rs = null;
$this->pagecount = 1;
$this->recordcount = 0;
$this->_queryrs = null;
$this->_lastrt = true;

return SUCCESS;
}

/**
* 执行查询，返回查询是否成功，参数可以为一条SQL文，或者一个SQL文数组
*
* @param string $sql
* @return bool
*/
function doexec($sql = "") {
$tran = false;
$isa = false;
$this->rset();
if(""==$sql||empty($sql)) {
$sql = $this->_cursql;
}
if(!is_array($sql)) {
if(!eregi("^select", trim($sql))) {
$tran = true;
}
}else {
$isa = true;
for($i = 0; $i < count($sql); $i++) {
if (!eregi("^select", trim($sql[$i]))) {
$tran = true;
break;
}
}
}
if ($tran) {
$tmp = @sqlrcur_sendQuery($this->_cur, "Begin Transaction");
if($tmp!=1) {
$this->_lastrt = false;
return FAILED;
}
}
if(!$isa) {
$tmp = @sqlrcur_sendQuery($this->_cur, $sql);
}else {
for ($i = 0; $i < count($sql); $i++) {
$tmp = @sqlrcur_sendQuery($this->_cur, $sql[$i]);
if($tmp!=1) break;
}
}
$this->setsql();
if($tmp==1) {
if($tran) @sqlrcur_sendQuery($this->_cur, "Commit Transaction");
$this->_lastrt = true;
}else {
if($tran) @sqlrcur_sendQuery($this->_cur, "Rollback Transaction");
$this->_lastrt = false;
return FAILED;
}
return SUCCESS;
}

/**
* 记录查询，只返回一条记录
*
* @return bool
*/
function doquery_row() {
$this->rset();
if((""==trim($this->_cursql))||empty($this->_cursql)) {
return false;
}
if(SYBASE==$this->_dbflag) {
@sqlrcur_sendQuery($this->_cur, "set rowcount 1");
$tmp = @sqlrcur_sendQuery($this->_cur, $this->_cursql);
if($tmp==1) {
$this->recordcount = @sqlrcur_rowCount($this->_cur);
$this->total = $this->recordcount;
if ($this->recordcount>0) {
$this->rs = @sqlrcur_getRow($this->_cur, 0);
}
}else {
$this->recordcount = -1;
$this->total = $this->recordcount;
@sqlrcur_sendQuery($this->_cur, "set rowcount 0");
return FAILED;
}
@sqlrcur_sendQuery($this->_cur, "set rowcount 0");
}elseif(ORACLE==$this->_dbflag) {
// 暂时不支持ORACLE
$sfmt = @ociparse($this->_conn, $this->_cursql);
$ret = @ociexecute($sfmt, OCI_DEFAULT);
if($ret) {
$this->recordcount = @oci_num_rows($sfmt);
$this->total = $this->recordcount;
if($this->recordcount>0) {
@ocifetchinto($sfmt, &$this->rs);
}
}else {
$this->recordcount = -1;
$this->total = $this->recordcount;
return FAILED;
}
}
$this->setsql();
return SUCCESS;
}

/**
* 记录查询，返回多条记录，可通过设置$rowcount来控制返回记录的最大数
*
* @param int $rowcount
* @return bool
*/
function doquery_rows($rowcount = 0) {
if(!eregi("[0-9]+", $rowcount)) {
$rowcount = 0;
}
$this->rset();
if((""==trim($this->_cursql))||empty($this->_cursql)) {
return FAILED;
}
if(SYBASE==$this->_dbflag) {
@sqlrcur_sendQuery($this->_cur, "set rowcount " .strval($rowcount));
$tmp = @sqlrcur_sendQuery($this->_cur, $this->_cursql);
if($tmp==1) {
$this->recordcount = @sqlrcur_rowCount($this->_cur);
$this->total = $this->recordcount;
if($this->recordcount > 0) {
if(0>=$this->pagesize||null==$this->pagesize) {
$this->pagecount = 1;
$startidx = 0;
$endidx = $this->recordcount - 1;
}else {
if($this->absolute<1) $this->absolute=1;
$this->pagecount = ceil($this->recordcount/$this->pagesize);
if($this->absolute>$this->pagecount) $this->absolute = $this->pagecount;
$startidx = $this->pagesize * ($this->absolute-1);
$endidx = $this->pagesize * $this->absolute -1;
}
$rcidx = 0;
// 以下保存结果到$this->rc
for($i = $startidx; $i <= $endidx&&$i<$this->total; $i++) {
if($rowcount!=0&&$rowcount==$i) break;
$this->rs[$rcidx++] = @sqlrcur_getRow($this->_cur, $i);
}
$this->recordcount = $rcidx;
}
}else {
$this->recordcount = -1;
$this->total = $this->recordcount;
@sqlrcur_sendQuery($this->_cur, "set rowcount 0");
return FAILED;
}
@sqlrcur_sendQuery($this->_cur, "set rowcount 0");
}elseif(ORACLE==$this->_dbflag) {
// 暂时不支持ORACLE
// Oracle 处理部分
$sfmt = @ociparse($this->_conn, $this->_cursql);
$ret = @ociexecute($sfmt, OCI_DEFAULT);
if($ret) {
$this->recordcount = @oci_num_rows($sfmt);
$this->total = $this->recordcount;
if($this->recordcount > 0) {
if($this->pagesize<=0||null==$this->pagesize) {
$this->pagecount = 1;
$startidx = 0;
$endidx = $this->recordcount - 1;
}else {
if($this->absolute < 1) $this->absolute = 1;
$this->pagecount = ceil($this->recordcount/$this->pagesize);
if($this->absolute>$this->pagecount) $this->absolute = $this->pagecount;
$startidx = $this->pagesize * ($this->absolute - 1);
$endidx = $this->pagesize * $this->absolute - 1;
// aaaaaaaaaaaaaa
}
}
}else {
$this->recordcount = -1;
$this->total = $this->recordcount;
return FAILED;
}
return FAILED;
}
$this->setsql();
return SUCCESS;
}

/**
* 关闭数据连接
*
* @return bool
*/
function dbclose() {
@sqlrcon_free($this->_conn);
@sqlrcur_free($this->_cur);
}

/**
* 设置或获取每页显示的记录数
*
* @param int $pagesize
* @return int
*/
function pagesize($pagesize = 0) {
if(eregi("[1-9]+", $pagesize)&&$pagesize!=0) {
$this->pagesize = intval($pagesize);
return $this->pagesize;
}else {
return $this->pagesize;
}
}

/**
* 设置或获取当前要显示的页次
*
* @param int $absolute
* @return int
*/
function absolute($absolute = 1) {
if(eregi(c