PHP新手上路（十二）使用PHP来操作Oracle数据库

11.2 查询

假设与数据库已经连接就绪，下面我们就来实际的应用对数据库的查询。下面的代码演示了一个连接并查询的典型例子：
/*
* 连接数据库并执行查询
*/
function printoraerr($in_cur)
{
// 检查Oracle是否出错
// 如果存在错误则显示
// 当指针被激活时每次请求Oracle后调用该函数
if(ora_errorcode($in_cur))
echo "Oracle code - ".ora_error($in_cur)."n";
return;
}
/** 主程序 */
if (!($cOnn=ora_logon("user@TNSNAME","password")))
{
echo "Connection to database failedn";
exit;
}
echo "Connected as connection - $conn
n";
echo "Opening cursor ...
n";
$cursor=ora_open($conn); printoraerr($cursor);
echo "Opened cursor - $cursor
n";
$qry="select user,sysdate from dual";
echo "Parsing the query $qry ...
n";
ora_parse($cursor,$qry,0); printoraerr($cursor);
echo "Query parsed
n";
echo "Executing cursor ...
n";
ora_exec($cursor); printoraerr($cursor);
echo "Executed cursor
n";
echo "Fetching cursor ...
n";
while(ora_fetch($cursor))
{
$user=ora_getcolumn($cursor,0); printoraerr($cursor);
$sysdate=ora_getcolumn($cursor,1); printoraerr($cursor);
echo " row = $user, $sysdate
n";
}
echo "Fetched all records
n";
echo "Closing cursor ...
n";
ora_close($cursor);
echo "Closed cursor
n";
echo "Logging off from oracle...
n";
ora_logoff($conn);
echo "Logged off from oracle
n";
?>
（译者注：以上代码段缺少注释，请读者参考PHP Manual的Oracle数据库函数部分）

11.3 显示结果

以下代码演示了怎样查询数据库并将结果输出：
function printoraerr($in_cur, $conn)
{
// 检查Oracle是否出错
// 如果存在错误则显示
// 当指针被激活时每次请求Oracle后调用该函数
// If it encountered an error, we exit immediately
if(ora_errorcode($in_cur))
{
echo "Oracle code - ".ora_error($in_cur)."
n";
ora_logoff($conn);
exit;
}
return;
}

function exequery($w_qry,$conn)
{
$cursor=ora_open($conn); printoraerr($cursor,$conn);
ora_parse($cursor,$w_qry,0); printoraerr($cursor,$conn);
ora_exec($cursor); printoraerr($cursor,$conn);
$numrows=0;
$w_numcols=ora_numcols($cursor);
// 显示头部
echo "

". 

ora_getcolumn($cursor,$i)."

// 主程序
if(!($cOnn=ora_logon("user@SID","password")))
{
echo "Error: Cannot connect to databasen";
exit;
}
$qry="SELECT
deptno "Dept"
,empno "Emp"
,empnm "Name"
,salary "Salary"
FROM
employee
ORDER BY 1,2";
exequery($qry);
ora_logoff($conn);
?>
（译者注：以上代码段缺少注释，请读者参考PHP Manual的Oracle数据库函数部分）

11.4 基于HTTP的Oracle登录

将以下代码加在PHP页面代码之前以确认Oracle登录。注意你必须正确设定$ SID。
if(!isset($PHP_AUTH_USER))
{
Header("WWW-authenticate: basic realm="$SID"");
Header("HTTP/1.0 401 Unauthorized");
$title="Login Instructions";
echo "

You are not authorized to enter the site

You are not authorised to enter the site