通過PHP你可以輕松的連接到數(shù)據(jù)庫，請求數(shù)據(jù)并將其顯示在你的web站點中，甚至修改數(shù)據(jù)庫中的數(shù)據(jù)。MySQL是一種很流行的數(shù)據(jù)庫，并且在互聯(lián)網(wǎng)中有許多有關(guān)PHP與MySQL的教程。MySQL是免費的，這一點也許就吸引了不少人。由于其廣泛應(yīng)用，我就不想在這里贅述MySQL的使用方法了。Oracle被大量在企業(yè)應(yīng)用中采用，因此我們就利用Oracle來介紹PHP與數(shù)據(jù)庫的連接。我們當(dāng)然不會提及Oracle數(shù)據(jù)庫的設(shè)計原理，原因是這已經(jīng)超出了我們的討論范圍。;;;PHP提供了兩套函數(shù)與Oracle連接，分別是ORA_和OCI函數(shù)。其中ORA_函數(shù)略顯陳舊。OCI函數(shù)更新?lián)f更好一些。兩者的使用語法幾乎相差無幾。如前所述，你的PHP安裝選項應(yīng)該可以支持兩者的使用。;;;想獲得更多有關(guān)在Microsoft;;Windows平臺上安裝支持PHP3的Apache服務(wù)器的知識以及更多有關(guān)Oracle數(shù)據(jù)庫的知識，請查閱以下URL：www.csoft.net/~vsbabu/articles/oraphp.html。;;;4.1;;連接;;;if;;($conn=Ora_Logon("user@TNSNAME","password"));;;;;{;;;echo;;"SUCCESS;;!;;Connected;;to;;databasen";;;;};;;;;else;;;;;{;;;echo;;"Failed;;:-(;;Could;;not;;connect;;to;;databasen";;;;};;;Ora_Logoff($conn);;;;phpinfo();;;;?>;;;以上代碼使用TNSNAME（在你的tnsnames.ora文件中指明）定義的Oracle數(shù)據(jù)庫名稱、用戶名稱和密碼連接數(shù)據(jù)庫。在成功連接的基礎(chǔ)上，ora_logon函數(shù)返回一個非零的連接ID并儲存在變量$conn中。;;;4.2;;查詢;;;假設(shè)與數(shù)據(jù)庫已經(jīng)連接就緒，下面我們就來實際的應(yīng)用對數(shù)據(jù)庫的查詢。下面的代碼演示了一個連接并查詢的典型例子：;;;/*;;;*;;連接數(shù)據(jù)庫并執(zhí)行查詢;;;*/;;;function;;printoraerr($in_cur);;;{;;;//;;檢查Oracle是否出錯;;;//;;如果存在錯誤則顯示;;;//;;當(dāng)指針被激活時每次請求Oracle后調(diào)用該函數(shù);;;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";;;;?>;;;（譯者注：以上代碼段缺少注釋，請讀者參考PHP;;Manual的Oracle數(shù)據(jù)庫函數(shù)部分）;;;4.3;;顯示結(jié)果;;;以下代碼演示了怎樣查詢數(shù)據(jù)庫并將結(jié)果輸出：;;;function;;printoraerr($in_cur,;;$conn);;;{;;;//;;檢查Oracle是否出錯;;;//;;如果存在錯誤則顯示;;;//;;當(dāng)指針被激活時每次請求Oracle后調(diào)用該函數(shù);;;//;;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($cursor);;;;//;;顯示頭部;;;echo;;";;;;;n";;;;for;;($i=0;$i<$w_numcols;$i++);;;{;;;$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";;;;echo;;"t;;".ora_columnname($cursor,$i).";;n";;;;};;;echo;;";;;n";;;;while(ora_fetch($cursor));;;{;;;echo;;";;n";;;;for;;($i=0;$i<$w_numcols;$i++);;;;;{;;;$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";;;;if(ora_columntype($cursor,$i)=="LONG");;;echo;;";;". ora_getcolumn($cursor,$i)." ;;n";;;;else;;;echo;;";;".ora_getcolumn($cursor,$i).";;n";;;;printoraerr($cursor,$conn);;;;};;;$numrows++;;;;echo;;";;;n";;;;};;;if;;($numrows==0);;;echo;;";;Query;;returned;;no;;records;;;;;;n";;;;else;;;;;{;;;echo;;";;n";;;;echo;;";;Count;;n";;;;echo;;";;$numrows;;n";;;;echo;;";;;n";;;;};;;echo;;";;n";;;;ora_close($cursor);;;;return;;;;};;;//;;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);;;;?>;;;（譯者注：以上代碼段缺少注釋，請讀者參考PHP;;Manual的Oracle數(shù)據(jù)庫函數(shù)部分）;;;4.4;;基于HTTP的Oracle登錄;;;將以下代碼加在PHP頁面代碼之前以確認Oracle登錄。注意你必須正確設(shè)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;;;n";;;;exit;;;;};;;;;else;;;;;{;;;if;;(!($conn=ora_logon("$PHP_AUTH_USER@$SID",$PHP_AUTH_PW)));;;;;{;;;Header("WWW-authenticate:;;basic;;realm="$SID"");;;;Header("HTTP/1.0;;401;;Unauthorized");;;;$title="Login;;Instructions";;;;echo;;" You;;are;;not;;authorised;;to;;enter;;the;;site;;;n";;;;exit;;;;};;;};;;?>;;;