Extractvalue是一個MySQL的函數，它可以用于從XML數據中提取值，并將提取的結果作為一個字符串返回。使用該函數可以解析XML和XPath表達式，并從中提取所需的數據。
它的語法結構如下：
extractvalue(xml_document, xpath_expression)
其中，xml_document是一個XML類型的數據，可以是字符串、XML類型的字段或文檔類型的對象。而xpath_expression則是要提取的值所在的XPath表達式。這個XPath表達式可以是絕對路徑，也可以是相對路徑。
我們可以通過以下示例理解該函數的用法：
SELECT ExtractValue('Harry PotterJ.K. Rowling200529.99', '/bookstore/book/title');以上代碼的結果將會是Harry Potter。它從一個XML文檔中提取了標簽中的值，這個標簽所在的路徑為/bookstore/book/title。</p><p>需要注意的是，如果XPath表達式返回多個結果，則Extractvalue函數只會提取第一個結果。如果XPath表達式未找到任何結果，則返回空字符串。</p><p>最后，我們需要注意該函數對于大型XML文件的處理速度可能會比較慢。如果需要從大型XML文件中提取值，可以考慮使用其他更適合處理大型數據的工具。</p></div><div id="gqwcw0a" class="share"></div><div id="eq0msq0" class="Prev_Next"><div id="o0ws2iq" class="box">上一篇<a href="http://52shenghuonet.cn/post/753793.html">mysql begin end</a></div><div id="uusigyg" class="box">下一篇<a href="http://52shenghuonet.cn/post/753795.html">mysql begin tran</a></div></div></div><div id="gaacoyy" class="related related-list"><h5>相關文章</h5><ul><li><a href="http://52shenghuonet.cn/post/1328271.html">c oracle 編碼</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328105.html">c l連接 oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328077.html">c 調用oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1327859.html">boot整合oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1327972.html">bw oracle連接</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328092.html">c ado oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328079.html">c 調用oracle函數</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328195.html">c oracle 存儲</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328115.html">c odbc 連接oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328072.html">c sequence oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328229.html">c oracle 報錯</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328129.html">c oracle long類型</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328094.html">c ado連接oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1327858.html">bootstrap$ Oracle</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/1328342.html">c oracle命令</a><span>07-06</span></li><li><a href="http://52shenghuonet.cn/post/912737.html">mysql中的e-r圖</a><span>05-21</span></li><li><a href="http://52shenghuonet.cn/post/530334.html">掌握mysql80新特性，提高索引效率（這些方法讓你的查詢秒回）</a><span>03-24</span></li><li><a href="http://52shenghuonet.cn/post/945752.html">mysql命令行啟動參數</a><span>05-24</span></li><li><a href="http://52shenghuonet.cn/post/493173.html">如何在C語言中實現與MySQL數據庫的連接</a><span>03-19</span></li><li><a href="http://52shenghuonet.cn/post/548793.html">mysql時間戳生成的原理（詳解mysql中時間戳的生成方式）</a><span>03-28</span></li><li><a href="http://52shenghuonet.cn/post/746304.html">lsoci mysql</a><span>04-26</span></li><li><a href="http://52shenghuonet.cn/post/1022699.html">mysql注冊登錄連數據庫</a><span>04-29</span></li><li><a href="http://52shenghuonet.cn/post/759623.html">mysql jion</a><span>04-25</span></li><li><a href="http://52shenghuonet.cn/post/1002789.html">mysql新增一列并賦值</a><span>05-02</span></li><li><a href="http://52shenghuonet.cn/post/752461.html">mysql 5.7 連接數</a><span>04-26</span></li><li><a href="http://52shenghuonet.cn/post/776976.html">mysql 商用授權</a><span>04-24</span></li><li><a href="http://52shenghuonet.cn/post/1014586.html">mysql查詢加號</a><span>04-30</span></li><li><a href="http://52shenghuonet.cn/post/627219.html">MySQL每秒數據減1怎么解決？</a><span>04-09</span></li><li><a href="http://52shenghuonet.cn/post/187215.html">什么是財務軟件</a><span>02-22</span></li><li><a href="http://52shenghuonet.cn/post/516772.html">如何設置MySQL賬號密碼（簡單易懂的教程）</a><span>03-22</span></li></ul></div></div></div></div><div class="0oqwcqc" id="footer"><div id="sqc2eoy" class="copyright"><div id="kwm2cee" class="container"><p>老白網絡 (http://52shenghuonet.cn/) 前端 后端 zblog主題.<a href="http://52shenghuonet.cn/sitemap/post.html">網站地圖</a><a href="http://52shenghuonet.cn/sitemap/post.xml">xml</a></p><span>Powered By Z-BlogPHP</span></div></div></div><div id="c2uck0o" class="bottom_tools"><a id="scrollUp" href="javascript:;" title="返回頂部"><i class="fa fa-angle-up"></i></a></div><script type="text/javascript" src="http://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script><script src="http://cdn.yzktw.com.cn/zb_users/theme/ydproduct/script/ads.js" type="text/javascript"></script><script src="http://cdn.yzktw.com.cn/zb_users/theme/ydproduct/script/common.min.js" type="text/javascript"></script><script src="http://cdn.staticfile.org/prettify/r298/prettify.min.js" type="text/javascript"></script><script>jQuery(window).load(function(){jQuery("pre").addClass("prettyprint");prettyPrint();});</script><div class="2wqyee0" id="ly_cache" data-id="736628"></div>
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