XPath浣跨敤璺緞琛ㄨ揪寮忔潵閫夊彇XML鏂囨。涓殑鑺傜偣鎴栬妭鐐歸泦銆傝妭鐐規槸閫氳繃娌跨潃鏌愪釜璺緞(path)鎴栬呮(step)鏉ラ夊彇鐨勩?/strong>
XML瀹炰緥鏂囨。
鎴戜滑灝嗗湪涓嬮潰鐨勪緥瀛愪腑浣跨敤榪欎釜XML鏂囨。銆?/p>
<?xml version="1.0" encoding="ISO-8859-1"?> <bookstore> <book> <title lang="eng">Harry Potter</title> <price>29.99</price> </book> <book> <title lang="eng">Learning XML</title> <price>39.95</price> </book> </bookstore>
閫夊彇鑺傜偣
XPath浣跨敤璺緞琛ㄨ揪寮忓湪XML鏂囨。涓夊彇鑺傜偣銆傝妭鐐規槸閫氳繃娌跨潃鏌愪釜璺緞鎴栬卻tep鏉ラ夊彇鐨勩?/p>
涓嬮潰鍒楀嚭浜嗘渶鏈夌敤鐨勮礬寰勮〃杈懼紡錛?/h4>
| 琛ㄨ揪寮?/th> | 鎻忚堪 |
|---|---|
| nodename | 閫夊彇姝よ妭鐐圭殑鎵鏈夊瓙鑺傜偣 |
| / | 浠庢牴鑺傜偣閫夊彇 |
| // | 浠庡尮閰嶉夋嫨鐨勫綋鍓嶈妭鐐歸夋嫨鏂囨。涓殑鑺傜偣錛岃屼笉鑰冭檻瀹冧滑鐨勪綅緗?/td> |
| . | 閫夊彇褰撳墠鑺傜偣 |
| .. | 閫夊彇褰撳墠鑺傜偣鐨勭埗鑺傜偣 |
| @ | 閫夊彇灞炴?/td> |
瀹炰緥
鍦ㄤ笅闈㈢殑琛ㄦ牸涓紝鎴戜滑宸插垪鍑轟簡涓浜涜礬寰勮〃杈懼紡浠ュ強琛ㄨ揪寮忕殑緇撴灉錛?/p>
| 璺緞琛ㄨ揪寮?/th> | 緇撴灉 |
|---|---|
| bookstore | 閫夊彇bookstore鍏冪礌鐨勬墍鏈夊瓙鑺傜偣 |
| /bookstore |
閫夊彇bookstore鏍瑰厓绱?/p> 娉ㄩ噴錛氬亣濡傝礬寰勮搗濮嬩簬姝ｆ枩鏉? / )錛屽垯姝よ礬寰勪負鍒版煇鍏冪礌鐨勭粷瀵硅礬寰勶紒 |
| bookstore/book | 閫夊彇鎵鏈夊睘浜巄ookstore鐨勫瓙鍏冪礌鐨刡ook鍏冪礌銆?/td> |
| //book | 閫夊彇鎵鏈塨ook瀛愬厓绱狅紝鑰屼笉綆″畠浠湪鏂囨。涓殑浣嶇疆銆?/td> |
| bookstore//book | 閫夋嫨鎵鏈夊睘浜巄ookstore鍏冪礌鐨勫悗浠ｇ殑book鍏冪礌錛岃屼笉綆″畠浠綅浜巄ookstore涔嬩笅鐨勪粈涔堜綅緗?/td> |
| //@lang | 閫夊彇鎵鏈夊悕涓簂ang鐨勫睘鎬с?/td> |
璋撹錛圥redicates錛?/h3>
璋撹鐢ㄦ潵鏌ユ壘鏌愪釜鐗瑰畾鐨勮妭鐐規垨鑰呭寘鍚煇涓寚瀹氱殑鍊肩殑鑺傜偣銆?/p>
璋撹琚祵鍦ㄦ柟鎷彿涓?/p>
瀹炰緥
鍦ㄤ笅闈㈢殑琛ㄦ牸涓紝鎴戜滑鍒楀嚭浜嗗甫鏈夎皳璇殑涓浜涜礬寰勮〃杈懼紡錛屼互鍙婅〃杈懼紡鐨勭粨鏋滐細
| 璺緞琛ㄨ揪寮?/th> | 緇撴灉 |
|---|---|
| /bookstore/book[1] | 閫夊彇灞炰簬bookstore瀛愬厓绱犵殑絎竴涓猙ook鍏冪礌銆?/td> |
| /bookstore/book[last()] | 閫夊彇灞炰簬bookstore瀛愬厓绱犵殑鏈鍚庝竴涓猙ook鍏冪礌銆?/td> |
| /bookstore/book[last()-1] | 閫夊彇灞炰簬bookstore瀛愬厓绱犵殑鍊掓暟絎簩涓猙ook鍏冪礌銆?/td> |
| /bookstore/book[position()<3] | 閫夊彇鏈鍓嶉潰鐨勪袱涓睘浜巄ookstore鍏冪礌鐨勫瓙鍏冪礌鐨刡ook鍏冪礌銆?/td> |
| //title[@lang] | 閫夊彇鎵鏈夋嫢鏈夊悕涓簂ang鐨勫睘鎬х殑title鍏冪礌銆?/td> |
| //title[@lang='eng'] | 閫夊彇鎵鏈塼itle鍏冪礌錛屼笖榪欎簺鍏冪礌鎷ユ湁鍊間負eng鐨刲ang灞炴с?/td> |
| /bookstore/book[price>35.00] | 閫夊彇鎵鏈塨ookstore鍏冪礌鐨刡ook鍏冪礌錛屼笖鍏朵腑鐨刾rice鍏冪礌鐨勫奸』澶т簬35.00銆?/td> |
| /bookstore/book[price>35.00]/title | 閫夊彇鎵鏈塨ookstore鍏冪礌涓殑book鍏冪礌鐨則itle鍏冪礌錛屼笖鍏朵腑鐨刾rice鍏冪礌鐨勫奸』澶т簬35.00銆?/td> |
閫夊彇鏈煡鑺傜偣
XPath閫氶厤絎﹀彲鐢ㄦ潵閫夊彇鏈煡鐨刋ML鍏冪礌銆?/p>
| 閫氶厤絎?/th> | 鎻忚堪 |
|---|---|
| * | 鍖歸厤浠諱綍鍏冪礌鑺傜偣 |
| @* | 鍖歸厤浠諱綍灞炴ц妭鐐?/td> |
| node() | 鍖歸厤浠諱綍綾誨瀷鐨勮妭鐐?/td> |
瀹炰緥
鍦ㄤ笅闈㈢殑琛ㄦ牸涓紝鎴戜滑鍒楀嚭浜嗕竴浜涜礬寰勮〃杈懼紡錛屼互鍙婅繖浜涜〃杈懼紡鐨勭粨鏋滐細
| 璺緞琛ㄨ揪寮?/th> | 緇撴灉 |
|---|---|
| /bookstore/* | 閫夊彇bookstore鍏冪礌鐨勬墍鏈夊瓙鑺傜偣 |
| //* | 閫夊彇鏂囨。涓殑鎵鏈夊厓绱?/td> |
| //title[@*] | 閫夊彇鎵鏈夊甫鏈夊睘鎬х殑title鍏冪礌銆?/td> |
閫夊彇鑻ュ共璺緞
閫氳繃鍦ㄨ礬寰勮〃杈懼紡涓嬌鐢ㄢ渱鈥濊繍綆楃錛屾偍鍙互浣跨敤閫夊彇鑻ュ共涓礬寰勩?/p>
瀹炰緥
鍦ㄤ笅闈㈢殑琛ㄦ牸涓紝鎴戜滑鍒楀嚭浜嗕竴浜涜礬寰勮〃杈懼紡錛屼互鍙婅繖浜涜〃杈懼紡鐨勭粨鏋滐細
| 璺緞琛ㄨ揪寮?/th> | 緇撴灉 |
|---|---|
| //book/title | //book/price | 閫夊彇鎵鏈塨ook鍏冪礌鐨則ilte鍜宲rice鍏冪礌銆?/td> |
| //title | //price | 閫夊彇鎵鏈夋枃妗ｄ腑鐨則itle鍜宲rice鍏冪礌銆?/td> |
| /bookstore/book/title | //price | 閫夊彇鎵鏈夊睘浜巄ookstore鍏冪礌鐨刡ook鍏冪礌鐨則itle鍏冪礌錛屼互鍙婃枃妗ｄ腑鎵鏈夌殑price鍏冪礌銆?/td> |
]]>