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(guī)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(guī)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(guī)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?zhèn)ㄥ彲浠ヤ娇鐢ㄩ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> |
]]>