$session = '098f6bcd4621d373cade4e832627b4f6';
// set time out to 30 minutes 
$timeout = time()+60*30;
// SELECT query showing how the datatype conversion works
$query = 'SELECT createtime, user_id FROM sessions';
$query .= ' WHERE session = '.$session;
$query .= ' AND lastaccess < '.$timeout;

// convert $timeout to the MDB timestamp format
$timeout = MDB_date::unix2Mdbstamp($timeout);
// SELECT query showing how the datatype conversion works
$query = 'SELECT createtime, user_id FROM sessions';
$query .= ' WHERE session = '.$mdb->getTextValue($session);
$query .= ' AND lastaccess < '.$mdb->getTimestampValue($timeout);

<br/>$result = $mdb->queryRow($query);

$types = array('timestamp', 'integer');
$result = $mdb->queryRow($query, $types);

$types = array('timestamp');
$result = $mdb->queryRow($query, $types);

$alldata = array(
array(1, 'one', 'un'),
array(2, 'two', 'deux'),
array(3, 'three', 'trois'),
array(4, 'four', 'quatre')
);
 
$p_query = $mdb->prepareQuery('INSERT INTO numbers VALUES (?,?,?)');
$param_types = array('integer', 'text', 'text');
 
foreach ($alldata as $row) {
$mdb->execute($p_query, NULL, $row, $param_types);
}

$binary_lob = array(
'Type' => 'inputfile',
'FileName' => './myfile.gif'
);
$blob = $mdb->createLob($binary_lob);
 
$character_lob = array(
'Type' => 'data',
'Data' => 'this would be a very long string container the CLOB data'
);
$clob = $mdb->createLob($character_lob);

$p_query = $mdb->prepareQuery('INSERT INTO files (id, b_data, c_data) VALUES (1, ?, ?)');
 
$mdb->setParamBlob($p_query, 1 , $blob, 'b_data');
$mdb->setParamClob($p_query, 2 , $clob, 'c_data');
 
$result = $mdb->executeQuery($p_query);

$mdb->query('SELECT b_data FROM files WHERE id = 1');
 
$binary_lob = array(
'Type' => 'outputfile',
'Result' => $result,
'Row' => 0,
'Field' => 'b_data',
'Binary' => 1,
'FileName' => './myfile2.gif'
);
$blob = $mdb->createLob($binary_lob);

<?xml version="1.0" encoding="ISO-8859-1" ?>
<database>
<name>auth< /name>
<create>1</create>
< /database>

<table>
<name> users</name>
<declaration><br /><field>
<name>user_id</name><br /><type>integer</type>
<notnull>1< /notnull>
<unsigned>1</unsigned><br /><default>0</default>
</field><br /><field>
<name>handle</name><br /><type>text</type>
<length>20< /length>
<notnull>1</notnull><br /><default></default>
</field><br /><field>
<name>is_active</name><br /><type>boolean</type>
<notnull>1< /notnull>
<default>N</default>
< /field>
</declaration>
</table><br />

<table>
<name> users</name>
<declaration><br /><index>
<unique>1</unique><br /><name>user_id_index</name><br /><field>
<name>user_id</name><br /><sorting>ascending</sorting>
< /field>
</index>
</declaration><br /></table>

<sequence><br/><name>users_user_id</name>
<start>1< /start>
<on>
<table>users< /table>
<field>user_id</field>
< /on>
</sequence>

<table>
<name> users</name>
<initialization><br /><insert>
<field><br /><name>user_id</name>
<value>1< /value>
</field>
<field><br /><name>handle</name>
<value>default< /value>
</field>
<field><br /><name>is_active</name>
<value>Y< /value>
</field>
</insert><br /></initialization>
</table>

$manager = new MDB_Manager;
$input_file = 'auth.schema';
// we do not have to connect to a specify a specific database at this time
$dsn = "mysql://$user:$pass@$host";
$manager->connect($dsn);
$manager->updateDatabase($input_file, $input_file. '.before');

<table>
<name> people</name>
<was>users</was><br /><declaration>
<field><br /><name>pwd</name>
<type>text< /type>
<length>32</length><br /><notnull>1</notnull>
<default>< /default>
</field>
< /declaration>
</table>

$input_file = 'auth.schema';
$manager->updateDatabase($input_file, $input_file.'.before');

<?xml version="1.0" encoding="ISO-8859-1" ?>
<database><br /><name><variable>name</variable>< /name>
</database>

 foreach($clients as $name) {
$variables = array('name' => $name)
$manager->updateDatabase($input_file, $input_file.'.before', $variables);
}

$result = $db->query($sql);
$row = $result->fetchRow();

$result = $mdb->query($sql);
$row = $mdb->fetchRow($result);

<?php
/**
  * 连接到MYSQL数据库
  */
  $host   = "localhost";
 
  $user   = "root";
  $passwd = "";
  $persistent = 1;
 
  if ($persisternt){
     $conn = mysql_connect($host,$user,$passwd);
  }else {
     $conn = mysql_pconnect($host,$user,$passwd);
  }
?>

<?php
function sql_exec($sql) {
    global $db_Name;
    $result = mysql_db_query($db_dbName,$sql);
    if (!$result) {
            echo mysql_errno(). ": ".mysql_error(). "<br>$sql<br>";
            exit();             
    }
    return $result;
}
$db_Name = "test";
$sql = "select * from users";
$result = sql_exec($sql);
while( $row = mysql_fetch_row($result) ){
    echo "姓名:$row[0] 性别：$row[1] 年龄 $row[2]<br>";
}
mysql_free_result($result);
?>

<?php
include_once "DB.php";
/*
* 连接到数据库
*/
   $db_host = "localhost";
   $db_user = "root";
   $db_passwd = "";
   $db_dbName = "test";
   $PersistentConnection = 1 ;
   $db_type ="mysql";
   $db_proto ="";
   $db = DB::connect("$db_type://$db_user@$db_passwd:$db_host/$db_dbName",$db_options);
   if( DB::isError($db) ){
       die "无法连接数据库，错误原因：".DB::errorMessage($db);
   }
function sql_exec($sql) {
    global $db;
    $result = $db->query($sql);
    if (DB::isError($result)){
        echo "发生数据库错误：".DB::errorMessage($result);
        exit();
    }
    return $result;
}   
/////////////////////////////////////////////
$sql = "select * from users";
$result = sql_exec($sql);
while( $row = $result->fetchRow() ){
    echo "姓名:$row[0] 性别：$row[1] 年龄 $row[2]<br>";
}
?>

   $db_type ="mysql";
变成：
   $db_type ="pgsql";

$dsn = array(
       'phptype'  => 'mysql',
       'dbsyntax' => '',
       'protocol' => '',
       'hostspec' => 'localhost',
       'database' => 'test',
       'username' => 'root',
       'password' => ''
       )

<?php
include_once "DB.php";
if ( DB::assertExtension("php_oci8") ){
    echo "oracle 8扩展加载成功！"；
}else {
    die "无法加载oracle 8扩展"；
}
?>

function DB_Error($code = DB_ERROR, $mode = PEAR_ERROR_RETURN, $level = E_USER_NOTICE, $debuginfo = null) 
//$code是DB错误代码，$mode决定错误处理的模式，缺省是返回，$level 错误级别， 
//$debuginfo是附加的调式信息，如刚刚执行的SQL语句等等。
 
 //DB_Warning 
//类似DB_Error。
 
//DB_result 
//这是非常重要的类。

function fetchRow($fetchmode = DB_FETCHMODE_DEFAULT)

function fetchInto(&$arr, $fetchmode = DB_FETCHMODE_DEFAULT)

function numCols()

function numRows()

function free()

<?php
  $db = DB::connect("$db_type://$db_user@$db_passwd:$db_host/$db_dbName",$db_options);
 
  if (DB::isError($db)){
      echo "数据库连接错误：".DB::errorMessage($db)."<br>";
      exit();
  }
  /* 查询1 */
  $sql = "select * from user_log";
  $result = $db->query($sql);
  if (DB::isError($result) ){
      echo "数据库错误：".DB::errorMessage($result);
      exit();
  }
 
  $colCount = $result->numCols();
  echo "<tr><td colspan=\"".$colCount."\">共找到".$result-> numRows()."位用户</td></tr>";
  while($row = $result->fetch()){
      echo "<tr><br />";
      for($i=0;$i<$colCount;$i++){
          echo "<td>".$row[$]."</td><br />";
      }
      echo "</tr><br />";
  }
  $result->free();
  $db->disconnect();
?>

function toString()

DB_mysql:(phptype=mysql,dbsyntax=)[connected]

function quoteString($string)

function provides($feature)

if($db->provider("transactions")){
      //支持事务
     }else {
      //不支持事务
     }

function errorCode($nativecode)

//在DB_mysql的构建函数中
$this-> errorcode_map = array(
            1004 => DB_ERROR_CANNOT_CREATE,
            1005 => DB_ERROR_CANNOT_CREATE,
            1006 => DB_ERROR_CANNOT_CREATE,
 
            1007 => DB_ERROR_ALREADY_EXISTS,
            1008 => DB_ERROR_CANNOT_DROP,
            1046 => DB_ERROR_NODBSELECTED,
            1050 => DB_ERROR_ALREADY_EXISTS,
            1051 => DB_ERROR_NOSUCHTABLE,
            1054 => DB_ERROR_NOSUCHFIELD,
            1062 => DB_ERROR_ALREADY_EXISTS,
            1064 => DB_ERROR_SYNTAX,
            1100 => DB_ERROR_NOT_LOCKED,
            1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
            1146 => DB_ERROR_NOSUCHTABLE,
        );

<?php
 // The pear base directory must be in your include_path
 require_once 'DB.php';
 $user = 'foo';
 $pass = 'bar';
 $host = 'localhost';
 $db_name = 'clients_db';
 
 // Data Source Name: This is the universal connection string
 $dsn = "mysql://$user:$pass@$host/$db_name";
 
 // DB::connect will return a Pear DB object on success
 // or a Pear DB Error object on error
 // You can also set to TRUE the second param
 // if you want a persistent connection:
 // $db = DB::connect($dsn, true);
 $db = DB::connect($dsn);
 
 // With DB::isError you can differentiate between an error or
 // a valid connection.
 if (DB::isError($db)) {
         die ($db->getMessage());
 }
 ....
 // You can disconnect from the database with:
 $db->disconnect();
 ?>

<?php
 // Once you have a valid DB object
 ...
 $sql = "select * from clients";
 // If the query is a "SELECT", $db->query will return
 // a DB Result object on success.
 // Else it simply will return a DB_OK
 // On failure it will return a DB Error object.
 $result = $db->query($sql);
 // Always check that $result is not an error
 if (DB::isError($result)) {
         die ($result->getMessage());
 }
 ....
 ?>

<?php
 // Once you have a valid DB Result object
 ...
 // Get each row of data on each iteration until
 // there is no more rows
 while ($row = $result->fetchRow()) {
     $id = $row[0];
 }
 ?>

<?php
 ...
 while ($result->fetchInto($row)) {
     $id = $row[0];
 }
 ?>

<?php
 $res = $db->query('select id, name, email from users');
 $row = $res->fetchRow($mode);
 
 //With $mode = DB_FETCHMODE_ORDERED
 //The default behavior is to return an ordered array.
 $row = array (
     0 => <column "id" data>,
     1 => <column "name" data>,
     2 => <column "email" data>
 );
 
 $id = $row[0];
 
 //With $mode = DB_FETCHMODE_ASSOC
 //Returns an associative array with column names as array keys:
 $row = array (
     'id'    => <column "id" data>,
     'name'  => <column "name" data>,
     'email' => <column "email" data>
 );
 
 $id = $row['id'];
 
 //With $mode = DB_FETCHMODE_OBJECT
 //Returns a DB_row object with column names as properties:
 $row = db_row Object 
 (
     [id]    => <column "id" data>,
     [name]  => <column "name" data>,
     [email] => <column "email" data>
 )
 
 $id = $row->id;
 ?>

<?php
 ...
 // 1) Set the mode per call:
 while ($row = $result->fetchRow(DB_FETCHMODE_ASSOC)) {
     [..]
 }
 while ($result->fetchInto($row, DB_FETCHMODE_ASSOC)) {
     [..]
 }
 
 // 2) Set the mode for all calls:
 $db = DB::connect($dsn);
 // this will set a default fetchmode for this Pear DB instance
 // (for all queries)
 $db->setFetchMode(DB_FETCHMODE_ASSOC);
 $result = $db->query(...);
 while ($row = $result->fetchRow()) {
     $id = $row['id'];
 }
 ?>

<?php
 ...
 // the row to start fetching
 $from = 50;
 // how many results per page
 $res_per_page = 10;
 // the last row to fetch for this page
 $to = $from + $res_per_page;
 foreach (range($from, $to) as $rownum) {
     if (!$row = $res->fetchrow($fetchmode, $rownum)) {
         break;
     }
     $id = $row[0];
     ....
 }
 ?>

<?php
 ...
 $result = $db->query('SELECT * FROM clients');
 while ($row = $result->fetchRow()) {
     ...
 }
 $result->free();
 ?>

<?php
/*
 *　用于数据的的联接操作，采用Pear的DB来操纵数据库
 */
  require_once "DB.php";
  $user = 'root';//用户名
  $pass = '';//联连密码
  $host = 'localhost';//服务器名
  $db_name = 'db_name1';//数据库名
  $dsn = "mysql://$user:$pass@$host/$db_name";//
  $B_DB = DB::connect($dsn);//数据库连接操作
 
  if(DB::isError($B_DB)){
  //连接错误处理
    echo "An error occurred while trying to connect to the database server.
\n";
          echo "Error message: " . $B_DB->getMessage() . "
\n";
          echo "A more detailed error description: ";
          die($B_DB->getDebugInfo());
  }
?>

<?php<br />/*
***********************************************
*        BaseClass.php
*        Base Class of the DB Execute function
*        Version  : 1.0
*        Author   : zhxiyao (zhxiyao#gmail(dot)com)
*        Copyright: www.xixis.net
*        Writed   : 2007/07/20
*        Modified : -
***********************************************
* BaseClass作为数据库操作的基类
* 包含了大多数对数据库操作的方法
* 不要直接实例化本类，要通过继承的方法来使用
* 可以在子类中将个别方法复写以适应特定的表
***********************************************/
include_once("./conn.ini.php");
    class BC_BaseClass{
        var $BV_TableName; //对象表名在继承时负值
 
        var $BV_SelectByID;
        var $DelbyID;
        var $BV_Insert;   //继承时需负值
        var $BV_Update;   //继承时需负值
        var $Error;
 
        /*
            构造函数初始化成员变量
        */
        function __construct(){
                $this->BV_SelectByID = "select * from ".$this->BV_TableName." where ID=?";
                $this->BV_DelbyID = 'delete from '.$this->BV_TableName.' where ID = ?';
        }
 
        /*
            function  BF_SelectByID;
            参数: $ID
            查询ID为$ID的记录
            输出: 查询结果集 为Array
        */
        function BF_SelectByID($ID){
            global $B_DB;
            $array = $B_DB->query($this->BV_SelectByID,$ID);
            if (PEAR::isError($array)) {
                echo "数据库错误: "."\n";
                echo "错误信息: " . $array->getMessage() . "\n";
                echo "详细信息: " . $array->getDebugInfo() . "\n";
            }
 
                $array->fetchInto($row,DB_FETCHMODE_ASSOC);
 
                if (empty($row)) {
                        $this->Error = "没有相关的记录";
                        return;
                }
                return $row;
        }
        /*
            function  BF_SelectBySql;
            参数: $SQL
            查询SQL为$SQL的记录
            输出: 查询结果集 为Array
        */
        function BF_SelectBySql($SQL){
            global $B_DB;
            $result = $B_DB->query($SQL);
            if (DB::isError($result)) {
                $this->Error = $result->getMessage();
                return;
            }
                $rows = array();
            while($result->fetchInto($row,DB_FETCHMODE_ASSOC)){
                $rows[] = $row;
            }
            if (empty($rows)) {
                $this->Error = "无记录.";
                return;
            }
            return $rows;
        }
        /*
            function  BF_Insert;
            参数: $InsertArray
            插入SQL为$Array的记录
            输出: 结果集 为true 或者false
        */
 
        function BF_Insert($InsertArray){
            global $B_DB;
            $array = $B_DB->Prepare($this->BV_Insert);
            $result = $B_DB->execute($array,$InsertArray);
            if (PEAR::isError($result)) {
                echo "数据库错误: " .: "\n";
                echo "错误信息: " . $result->getMessage() . : "\n";
                echo "详细信息: " . $result->getDebugInfo() . "\n";
                return 0;
            }
            else return 1;
        }
        /*
            function  BF_Update;
            参数: $UpdateArray,$ID
            插入对象为$UpdateArray的记录
            输出: 结果集 为true 或者false
        */
        function BF_Update($UpdateArray,$ID){
            global $B_DB;
            $temp=array();
                $temp=$UpdateArray;
                $temp[]=$ID;
 
            $array = $B_DB->Prepare($this->BV_Update);
           $result = $B_DB->execute($array,$temp);
           if (PEAR::isError($result)) {
                echo "数据库错误: " .: "\n";
                echo "错误信息: " . $result->getMessage() . : "\n";
                echo "详细信息: " . $result->getDebugInfo() . "\n";
                return 0;
           }
           else return 1;
        }
        /*
            function  BF_DeleteByID;
            参数: $ID
            插入对象为$Array的记录
            输出: 结果集 为true 或者false
        */
        function BF_DeleteByID($ID){
                global $B_DB;
                $array = $B_DB->prepare($this->BV_DelbyID);
                $result = $B_DB->execute($array,$ID);
                if (DB::isError($result)) {
                        $this->Error = $result->getMessage();
                        echo "数据库错误: " .: "\n";
                	echo "错误信息: " . $result->getMessage() . : "\n";
                	echo "详细信息: " . $result->getDebugInfo() . "\n";
                        return 0;
                }
                else if (!$B_DB->affectedRows()!=0) {
                        $this->Error = '该记录不存在';
                        echo '该记录不存在';
                        return 0;
                }
                else return 1;
    }
    }
 
?>

CREATE TABLE `test` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `Name` int(11) DEFAULT NULL,
  `Bak1` varchar(30) DEFAULT NULL,
  `Bak2` varchar(30) DEFAULT NULL,
  PRIMARY KEY  (`ID`)
) TYPE=MyISAM AUTO_INCREMENT=1 ;

<?
/**
 *类名称:BC_Test
 *类方法:
  继承自基类的方法：
 *  BF_SelectByID
 *  BF_SelectBySql
 * BF_Insert
 * BF_Update
 
 * 类开发目标:定义封装数据库中Test表所有操作
 * 作者:zhxiyao
 *
 * @version v1.0 //每修改一次,版本增加小号1.1,大的修改变为2.0
 * 每进行一次修改,一定要在开始说明修改原因,修改后性能的改进
 * @copyright 2007
 */
        include_once("./BaseClass.php");
        class   BC_Test extends BC_BaseClass{
 
                function __construct(){
                        $this->BV_TableName ='test'; //指定操作表名；
                        //初始化表含有的字段；
                        $this->BV_Insert='INSERT INTO `test` (`Name` , `Bak1` , `Bak2`) VALUES (?,?,?)'; 
                        $this->BV_Update='UPDATE `product` SET `Name` = ?,`Bak1` = ?,`Bak2` = ?  WHERE `ID` = ? ';
 
                        parent::__construct();                       
                }
                function 新方法{
 
                }
                function 基类方法名{
                   //复写方法
                }
        }
?>