转一个SQL Ralay数据库连接池的PHP操作类

数据|数据库|数据库连接

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

    /**
     * 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; $i                     if (!eregi("^select", trim($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                     $tmp = @sqlrcur_sendQuery($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->absoluteabsolute=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 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->pagesizepagesize) {
                            $this->pagecount = 1;
                            $startidx = 0;
                            $endidx = $this->recordcount - 1;
                        }else {
                            if($this->absolute 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("[1-9]+", $absolute)&&$absolute>1) {
                $this->absolute = intval($absolute);
                return $this->absolute;
            }else {
                return $this->absolute;
            }
        }
    }
?>