使用PHP连接多种数据库的实现代码(mysql,access,sqlserver,Oracle)

<?php  $mysql_server_name='localhost'; //改成自己的mysql数据库服务器 $mysql_username='root'; //改成自己的mysql数据库用户名 $mysql_password='12345678'; //改成自己的mysql数据库密码 $mysql_database='mycounter'; //改成自己的mysql数据库名 $conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database);  $sql='CREATE DATABASE mycounter DEFAULT CHARACTER SET gbk COLLATE gbk_chinese_ci;  ';  mysql_query($sql);  $sql='CREATE TABLE `counter` (`id` INT(255) UNSIGNED NOT NULL AUTO_INCREMENT ,`count` INT(255) UNSIGNED NOT NULL DEFAULT 0,PRIMARY KEY ( `id` ) ) TYPE = innodb;';  mysql_select_db($mysql_database,$conn);  $result=mysql_query($sql);  //echo $sql;  mysql_close($conn);  echo "Hello!数据库mycounter已经成功建立！";  ?>

<? $conn = new com("ADODB.Connection");  $connstr = "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=". realpath("data/db.mdb");  $conn->Open($connstr);  $rs = new com("ADODB.RecordSet");  $rs->Open("select * from szd_t",$conn,1,1);  while(! $rs->eof) {  $f = $rs->Fields(1);  echo $f->value;  $rs->MoveNext();  }  ?>

< ?php  $myServer = localhost; //主机 $myUser = sa; //用户名 $myPass = password; //密码 $myDB = Northwind; //MSSQL库名 $s = @mssql_connect($myServer, $myUser, $myPass)  or die(Couldnt connect to SQL Server on $myServer);  $d = @mssql_select_db($myDB, $s)  or die(Couldnt open database $myDB);  $query = SELECT TitleOfCourtesy+ +FirstName+ +LastName AS Employee ;  $query .= FROM Employees ;  $query .= WHERE Country=USA AND Left(HomePhone, 5) = (206);  $result = mssql_query($query);  $numRows = mssql_num_rows($result);  echo < h1> . $numRows . Row . ($numRows == 1 ? : s) . Returned ;  while($row = mssql_fetch_array($result))  {  echo < li> . $row[Employee] . < /li>;  }  ?>

<? if ($conn=Ora_Logon("user@TNSNAME","password"))  { echo "SUCCESS ! Connected to database/n";  }else  {echo "Failed 
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