PHP与Oracle数据库连接
通过PHP你可以轻松的连接到数据库,请求数据并将其显示在你的web站点中,甚至修改数据库中的数据,MySQL是一种很流行的数据库,并且在互联网中有许多有关PHP与MySQL的教程,MySQL是免费的,这一点也许就吸引了不少人.
由于其广泛应用,我就不想在这里赘述MySQL的使用方法了,Oracle被大量在企业应用中采用,因此我们就利用Oracle来介绍PHP与数据库的连接,我们当然不会提及Oracle数据库的设计原理,原因是这已经超出了我们的讨论范围.
PHP提供了两套函数与Oracle连接,分别是ORA_和OCI函数,其中ORA_函数略显陈旧,OCI函数更新据说更好一些,两者的使用语法几乎相差无几,如前所述,你的PHP安装选项应该可以支持两者的使用.
PHP与Oracle数据库连接:
- <?php
- if ($conn=Ora_Logon("user@TNSNAME","password"))
- {
- echo "<B>SUCCESS ! Connected to database<B> ";
- }
- else
- {
- echo "<B>Failed :-( Could not connect to database<B> ";
- }
- Ora_Logoff($conn);
- phpinfo();
- ?>
以上代码使用TNSNAME,在你的tnsnames.ora文件中指明,定义的Oracle数据库名称、用户名称和密码连接数据库,在成功连接的基础上,ora_logon函数返回一个非零的连接ID并储存在变量$conn中.
PHP与oracle数据库查询.
假设与数据库已经连接就绪,下面我们就来实际的应用对数据库的查询,下面的代码演示了一个连接并查询的典型例子:
- <?php
-
-
-
- function printoraerr($in_cur)
- {
-
-
-
- if(ora_errorcode($in_cur))
- echo "Oracle code - ".ora_error($in_cur)." ";
- return;
- }
-
- if (!($conn=ora_logon("user@TNSNAME","password")))
- {
- echo "Connection to database failed ";
- exit;
- }
- echo "Connected as connection - <b>$conn</b><br> ";
- echo "Opening cursor ...<br> ";
- $cursor=ora_open($conn); printoraerr($cursor);
- echo "Opened cursor - <b>$cursor</b><br> ";
- $qry="select user,sysdate from dual";
- echo "Parsing the query <b>$qry</b> ...<br> ";
- ora_parse($cursor,$qry,0); printoraerr($cursor);
- echo "Query parsed <br> ";
- echo "Executing cursor ...<br> ";
- ora_exec($cursor); printoraerr($cursor);
- echo "Executed cursor<br> ";
- echo "Fetching cursor ...<br> ";
- while(ora_fetch($cursor))
- {
- $user=ora_getcolumn($cursor,0); printoraerr($cursor);
- $sysdate=ora_getcolumn($cursor,1); printoraerr($cursor);
- echo " row = <B>$user, $sysdate </B><br> ";
- }
- echo "Fetched all records<br> ";
- echo "Closing cursor ...<br> ";
- ora_close($cursor);
- echo "Closed cursor<br> ";
- echo "Logging off from oracle... <br> ";
- ora_logoff($conn);
- echo "Logged off from oracle <br> ";
- ?>
译者注:以上代码段缺少注释,请读者参考PHP Manual的Oracle数据库函数部分.
显示结果,以下代码演示了怎样查询数据库并将结果输出:
- <?php
- function printoraerr($in_cur, $conn)
- {
-
-
-
-
- if(ora_errorcode($in_cur))
- {
- echo "Oracle code - ".ora_error($in_cur)."<br>n";
- ora_logoff($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);
-
- echo "
- <TABLE WIDTH="100%" BORDER="0" CELLSPACING="1" CELLPADDING="2">
- <TR> ";
- for ($i=0;$i<$w_numcols;$i )
- {
- $align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
- echo " <TH VALIGN=TOP ALIGN=$align>".ora_columnname($cursor,$i)."</TH> ";
- }
- echo "</TR> ";
- while(ora_fetch($cursor))
- {
- echo "<TR> ";
- for ($i=0;$i<$w_numcols;$i )
- {
- $align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
- if(ora_columntype($cursor,$i)=="LONG")
- echo "<TD VALIGN=TOP ALIGN=$align><PRE>".
- ora_getcolumn($cursor,$i)."</PRE></TD> ";
- else
- echo "<TD VALIGN=TOP ALIGN=$align>".ora_getcolumn($cursor,$i)."</TD> ";
- printoraerr($cursor,$conn);
- }
- $numrows ;
- echo "</TR> ";
- }
- if ($numrows==0)
- echo "<TR><TD COLSPAN="$w_numcols"><B>Query returned no records
- </B></TD></TR> ";
- else
- {
- echo "<TR> ";
- echo "<TH COLSPAN="".($w_numcols-1)."" ALIGN=RIGHT>Count</TH> ";
- echo "<TH ALIGN=RIGHT>$numrows</TH> ";
- echo "</TR> ";
- }
- echo "</TABLE> ";
- ora_close($cursor);
- return;
- }
-
-
- if(!($conn=ora_logon("user@SID","password")))
- {
- echo "Error: Cannot connect to database ";
- exit;
- }
- $qry="SELECT
- deptno "Dept"
- ,empno "Emp"
- ?>