{"id":186730,"date":"2024-11-11T08:21:27","date_gmt":"2024-11-11T00:21:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186730\/"},"modified":"2024-11-11T08:21:29","modified_gmt":"2024-11-11T00:21:29","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8a%80%e8%a1%93%e5%af%a6%e7%94%a8%e6%8a%80%e5%b7%a7%ef%bc%9a%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e6%95%99%e7%a8%8b-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8a%80%e8%a1%93%e6%89%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186730\/","title":{"rendered":"\u6578\u64da\u5eab\u6280\u8853\u5be6\u7528\u6280\u5de7\uff1a\u6279\u91cf\u4fee\u6539\u6559\u7a0b (\u6578\u64da\u5eab\u6280\u8853\u6279\u91cf\u4fee\u6539)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%8a%80%e8%a1%93%e5%af%a6%e7%94%a8%e6%8a%80%e5%b7%a7%ef%bc%9a%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e6%95%99%e7%a8%8b-hYeDNWeidA\">\u6578\u64da\u5eab\u6280\u8853\u5be6\u7528\u6280\u5de7\uff1a\u6279\u91cf\u4fee\u6539\u6559\u7a0b<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u6280\u8853\u7684\u61c9\u7528\u8d8a\u4f86\u8d8a\u5ee3\u6cdb\u3002\u7121\u8ad6\u662f\u4f01\u696d\u7ba1\u7406\u3001\u96fb\u5b50\u5546\u52d9\u9084\u662f\u793e\u4ea4\u5a92\u9ad4\uff0c\u6578\u64da\u5eab\u90fd\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002\u6279\u91cf\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u662f\u4e00\u9805\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u66f4\u65b0\u5927\u91cf\u8a18\u9304\u6642\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5be6\u7528\u7684\u6279\u91cf\u4fee\u6539\u6280\u5de7\uff0c\u5e6b\u52a9\u60a8\u66f4\u9ad8\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%ef%bc%9f-hYeDNWeidA\">\u4ec0\u9ebc\u662f\u6279\u91cf\u4fee\u6539\uff1f<\/h2>\n<p>\u6279\u91cf\u4fee\u6539\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u540c\u6642\u66f4\u65b0\u591a\u689d\u8a18\u9304\u7684\u904e\u7a0b\u3002\u9019\u7a2e\u64cd\u4f5c\u901a\u5e38\u7528\u65bc\u9700\u8981\u5c0d\u591a\u500b\u689d\u76ee\u9032\u884c\u76f8\u540c\u66f4\u6539\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u66f4\u65b0\u50f9\u683c\u3001\u72c0\u614b\u6216\u5176\u4ed6\u5c6c\u6027\u3002\u6279\u91cf\u4fee\u6539\u4e0d\u50c5\u53ef\u4ee5\u7bc0\u7701\u6642\u9593\uff0c\u9084\u80fd\u6e1b\u5c11\u56e0\u591a\u6b21\u64cd\u4f5c\u800c\u53ef\u80fd\u5f15\u767c\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e9%80%b2%e8%a1%8c%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9-hYeDNWeidA\">\u4f7f\u7528 SQL \u9032\u884c\u6279\u91cf\u4fee\u6539<\/h2>\n<p>\u5728\u5927\u591a\u6578\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u9032\u884c\u6578\u64da\u64cd\u4f5c\u7684\u4e3b\u8981\u5de5\u5177\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u8a9e\u53e5\uff0c\u7528\u65bc\u6279\u91cf\u4fee\u6539\u6578\u64da\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-update-%e8%aa%9e%e5%8f%a5-hYeDNWeidA\">1. \u4f7f\u7528 UPDATE \u8a9e\u53e5<\/h3>\n<pre><code>UPDATE \u8868\u540d\nSET \u5217\u540d1 = \u65b0\u503c1, \u5217\u540d2 = \u65b0\u503c2\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u8981\u5c07\u6240\u6709\u7522\u54c1\u7684\u50f9\u683c\u63d0\u9ad8 10%\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE products\nSET price = price * 1.1;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-case-%e8%aa%9e%e5%8f%a5%e9%80%b2%e8%a1%8c%e6%a2%9d%e4%bb%b6%e6%9b%b4%e6%96%b0-hYeDNWeidA\">2. \u4f7f\u7528 CASE \u8a9e\u53e5\u9032\u884c\u689d\u4ef6\u66f4\u65b0<\/h3>\n<p>\u5982\u679c\u9700\u8981\u6839\u64da\u4e0d\u540c\u689d\u4ef6\u66f4\u65b0\u4e0d\u540c\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 CASE \u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u6839\u64da\u7522\u54c1\u985e\u5225\u66f4\u65b0\u50f9\u683c\uff1a<\/p>\n<pre><code>UPDATE products\nSET price = CASE\n    WHEN category = 'A' THEN price * 1.1\n    WHEN category = 'B' THEN price * 1.2\n    ELSE price\nEND;<\/code><\/pre>\n<h2 id=\"%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-hYeDNWeidA\">\u6279\u91cf\u4fee\u6539\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u6279\u91cf\u4fee\u6539\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u4efb\u4f55\u6279\u91cf\u4fee\u6539\u4e4b\u524d\uff0c\u52d9\u5fc5\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u640d\u5931\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u4fee\u6539\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u57f7\u884c\u6279\u91cf\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u6e2c\u8a66\uff0c\u4ee5\u78ba\u4fdd\u4fee\u6539\u7684\u6b63\u78ba\u6027\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9\uff1a<\/strong>\u5982\u679c\u6578\u64da\u5eab\u652f\u6301\u4e8b\u52d9\uff0c\u5efa\u8b70\u5c07\u6279\u91cf\u4fee\u6539\u5305\u88dd\u5728\u4e8b\u52d9\u4e2d\uff0c\u4ee5\u4fbf\u5728\u51fa\u73fe\u932f\u8aa4\u6642\u53ef\u4ee5\u56de\u6efe\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%85%b3%e6%9c%ac%e9%80%b2%e8%a1%8c%e6%89%b9%e9%87%8f%e4%bf%ae%e6%94%b9-hYeDNWeidA\">\u4f7f\u7528\u8173\u672c\u9032\u884c\u6279\u91cf\u4fee\u6539<\/h2>\n<p>\u5c0d\u65bc\u9700\u8981\u5b9a\u671f\u9032\u884c\u7684\u6279\u91cf\u4fee\u6539\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8003\u616e\u7de8\u5beb\u8173\u672c\u4f86\u81ea\u52d5\u5316\u9019\u4e00\u904e\u7a0b\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Python \u548c SQLAlchemy \u7684\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n<pre><code>from sqlalchemy import create_engine, update\nfrom sqlalchemy.orm import sessionmaker\nfrom models import Product  # \u5047\u8a2d\u60a8\u6709\u4e00\u500b Product \u6a21\u578b\n\nengine = create_engine('mysql+pymysql:\/\/user:password@localhost\/dbname')\nSession = sessionmaker(bind=engine)\nsession = Session()\n\n# \u6279\u91cf\u66f4\u65b0\u50f9\u683c\nproducts = session.query(Product).filter(Product.category == 'A').all()\nfor product in products:\n    product.price *= 1.1\n\nsession.commit()\nsession.close();<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hYeDNWeidA\">\u7e3d\u7d50<\/h2>\n<p>\u6279\u91cf\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u60a8\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u4e26\u6e1b\u5c11\u932f\u8aa4\u3002\u901a\u904e\u4f7f\u7528 SQL \u8a9e\u53e5\u3001CASE \u8a9e\u53e5\u4ee5\u53ca\u81ea\u52d5\u5316\u8173\u672c\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u6279\u91cf\u4fee\u6539\u3002\u5728\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\u4e4b\u524d\uff0c\u8acb\u52d9\u5fc5\u5099\u4efd\u6578\u64da\u4e26\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u6e2c\u8a66\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u652f\u6301\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u548c\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u6578\u64da\u5eab\u6280\u8853\u7684\u6279\u91cf\u4fee\u6539\u6280\u5de7\uff0c\u5b78\u7fd2\u5be6\u7528\u6559\u7a0b\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u7ba1\u7406\u6d41\u7a0b\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-186730","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186730","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=186730"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186730\/revisions"}],"predecessor-version":[{"id":186731,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186730\/revisions\/186731"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}