{"id":96282,"date":"2024-10-20T08:07:16","date_gmt":"2024-10-20T00:07:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96282\/"},"modified":"2024-10-20T08:07:16","modified_gmt":"2024-10-20T00:07:16","slug":"oracle%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96282\/","title":{"rendered":"Oracle\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593"},"content":{"rendered":"<h1 id=\"oracle%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93-kMqcUMhAqw\">Oracle\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5be6\u73fe\u7279\u5b9a\u7684\u696d\u52d9\u908f\u8f2f\u3002\u7136\u800c\uff0c\u9019\u4e9b\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u53ef\u80fd\u6703\u5f71\u97ff\u6574\u9ad4\u7cfb\u7d71\u7684\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u6e2c\u91cf\u548c\u512a\u5316\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-kMqcUMhAqw\">\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u7528PL\/SQL\u8a9e\u8a00\u7de8\u5beb\u7684\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728SQL\u67e5\u8a62\u4e2d\u88ab\u8abf\u7528\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u4e26\u8fd4\u56de\u503c\uff0c\u901a\u5e38\u7528\u65bc\u6578\u64da\u8655\u7406\u548c\u8a08\u7b97\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u81ea\u5b9a\u7fa9\u51fd\u6578\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE OR REPLACE FUNCTION calculate_discount(price NUMBER, discount_rate NUMBER) \nRETURN NUMBER IS\nBEGIN\n    RETURN price * (1 - discount_rate);\nEND;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6578\u8a08\u7b97\u7d66\u5b9a\u50f9\u683c\u7684\u6298\u6263\u5f8c\u50f9\u683c\u3002<\/p>\n<h2 id=\"%e6%b8%ac%e9%87%8f%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93%e7%9a%84%e6%96%b9%e6%b3%95-kMqcUMhAqw\">\u6e2c\u91cf\u57f7\u884c\u6642\u9593\u7684\u65b9\u6cd5<\/h2>\n<p>\u8981\u6e2c\u91cf\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\uff0c\u53ef\u4ee5\u4f7f\u7528Oracle\u63d0\u4f9b\u7684\u5167\u5efa\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>DBMS_UTILITY.GET_TIME<\/strong>\uff1a\u9019\u662f\u4e00\u500b\u5167\u5efa\u7684PL\/SQL\u5305\uff0c\u53ef\u4ee5\u7528\u4f86\u7372\u53d6\u7576\u524d\u7684\u6642\u9593\u6233\u3002<\/li>\n<li><strong>EXPLAIN PLAN<\/strong>\uff1a\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u5206\u6790SQL\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u9593\u63a5\u4e86\u89e3\u51fd\u6578\u7684\u6027\u80fd\u3002<\/li>\n<li><strong>SQL Trace<\/strong>\uff1a\u555f\u7528SQL Trace\u53ef\u4ee5\u8a18\u9304\u6240\u6709SQL\u8a9e\u53e5\u7684\u57f7\u884c\u6642\u9593\uff0c\u9019\u5c0d\u65bc\u6027\u80fd\u8abf\u512a\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528DBMS_UTILITY.GET_TIME\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE\n    start_time NUMBER;\n    end_time NUMBER;\n    result NUMBER;\nBEGIN\n    start_time := DBMS_UTILITY.GET_TIME;\n    \n    result := calculate_discount(100, 0.1);\n    \n    end_time := DBMS_UTILITY.GET_TIME;\n    \n    DBMS_OUTPUT.PUT_LINE('\u57f7\u884c\u6642\u9593: ' || (end_time - start_time) || ' \u79d2');\nEND;\n<\/code><\/pre>\n<h2 id=\"%e5%84%aa%e5%8c%96%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93-kMqcUMhAqw\">\u512a\u5316\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6548\u7387\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u65b9\u9762\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97<\/strong>\uff1a\u5728\u51fd\u6578\u4e2d\uff0c\u61c9\u8a72\u907f\u514d\u91cd\u8907\u8a08\u7b97\u76f8\u540c\u7684\u503c\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u57f7\u884c\u6642\u9593\u3002<\/li>\n<li><strong>\u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/strong>\uff1a\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u4f7f\u7528NUMBER\u800c\u4e0d\u662fVARCHAR2\u4f86\u5b58\u5132\u6578\u5b57\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u4e0a\u4e0b\u6587\u5207\u63db<\/strong>\uff1a\u5728PL\/SQL\u4e2d\uff0c\u904e\u591a\u7684\u4e0a\u4e0b\u6587\u5207\u63db\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8a72\u76e1\u91cf\u6e1b\u5c11\u5c0dSQL\u7684\u8abf\u7528\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u512a\u5316\u5f8c\u7684\u51fd\u6578\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE OR REPLACE FUNCTION optimized_discount(price NUMBER, discount_rate NUMBER) \nRETURN NUMBER IS\n    discounted_price NUMBER;\nBEGIN\n    discounted_price := price * (1 - discount_rate);\n    RETURN discounted_price;\nEND;\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-kMqcUMhAqw\">\u7d50\u8ad6<\/h2>\n<p>\u81ea\u5b9a\u7fa9\u51fd\u6578\u5728Oracle\u6578\u64da\u5eab\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u4e86\u89e3\u5176\u57f7\u884c\u6642\u9593\u7684\u6e2c\u91cf\u548c\u512a\u5316\u65b9\u6cd5\u5c0d\u65bc\u63d0\u5347\u7cfb\u7d71\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528\u5408\u9069\u7684\u5de5\u5177\u548c\u6280\u8853\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u512a\u5316\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u61c9\u7528\u7a0b\u5e8f\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\uff0c\u63d0\u5347\u6027\u80fd\u512a\u5316\uff0c\u78ba\u4fdd\u6578\u64da\u8655\u7406\u6548\u7387\u8207\u7cfb\u7d71\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-96282","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96282","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=96282"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96282\/revisions"}],"predecessor-version":[{"id":96283,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96282\/revisions\/96283"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}