{"id":187760,"date":"2024-11-11T16:57:19","date_gmt":"2024-11-11T08:57:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187760\/"},"modified":"2024-11-11T16:57:20","modified_gmt":"2024-11-11T08:57:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%95%b8%e7%b5%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95%e7%b0%a1%e4%bb%8b-%e6%95%b8%e7%b5%84%e4%b8%ad%e6%80%8e%e9%ba%bc%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187760\/","title":{"rendered":"\u6578\u64da\u5eab\u4e2d\u7684\u6578\u7d44\u522a\u9664\u65b9\u6cd5\u7c21\u4ecb (\u6578\u7d44\u4e2d\u600e\u9ebc\u522a\u9664\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%95%b8%e7%b5%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95%e7%b0%a1%e4%bb%8b-%e6%95%b8%e7%b5%84%e4%b8%ad%e6%80%8e%e9%ba%bc%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a-vuYtWvfkgI\">\u6578\u64da\u5eab\u4e2d\u7684\u6578\u7d44\u522a\u9664\u65b9\u6cd5\u7c21\u4ecb (\u6578\u7d44\u4e2d\u600e\u9ebc\u522a\u9664\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u7d44\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u6578\u64da\u7d50\u69cb\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u591a\u500b\u76f8\u95dc\u6578\u64da\u6642\u3002\u6578\u7d44\u7684\u522a\u9664\u64cd\u4f5c\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u90e8\u5206\uff0c\u56e0\u70ba\u5b83\u6d89\u53ca\u5230\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u6578\u64da\u5eab\u4e2d\u6578\u7d44\u7684\u522a\u9664\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e6%95%b8%e7%b5%84%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-vuYtWvfkgI\">\u6578\u7d44\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u7d44\u662f\u4e00\u7a2e\u53ef\u4ee5\u5b58\u5132\u591a\u500b\u76f8\u540c\u985e\u578b\u6578\u64da\u7684\u6578\u64da\u7d50\u69cb\u3002\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u6578\u7d44\u901a\u5e38\u7528\u65bc\u5b58\u5132\u4e00\u7d44\u76f8\u95dc\u7684\u6578\u64da\uff0c\u4f8b\u5982\u7528\u6236\u7684\u591a\u500b\u5730\u5740\u6216\u8a02\u55ae\u7684\u591a\u500b\u9805\u76ee\u3002\u6578\u7d44\u7684\u512a\u52e2\u5728\u65bc\u5b83\u80fd\u5920\u7c21\u5316\u6578\u64da\u7684\u7ba1\u7406\u548c\u67e5\u8a62\uff0c\u4f46\u5728\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u5247\u9700\u8981\u7279\u5225\u6ce8\u610f\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%95%b8%e7%b5%84%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95-vuYtWvfkgI\">\u6578\u64da\u5eab\u4e2d\u6578\u7d44\u7684\u522a\u9664\u65b9\u6cd5<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u522a\u9664\u6578\u7d44\u4e2d\u7684\u5143\u7d20\uff0c\u901a\u5e38\u6709\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u5177\u9ad4\u53d6\u6c7a\u65bc\u6240\u4f7f\u7528\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u522a\u9664\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-sql-%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e6%95%b8%e7%b5%84%e5%85%83%e7%b4%a0-vuYtWvfkgI\">1. \u4f7f\u7528 SQL \u8a9e\u53e5\u522a\u9664\u6578\u7d44\u5143\u7d20<\/h3>\n<p>\u5728\u8a31\u591a\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\uff0c\u6578\u7d44\u53ef\u4ee5\u901a\u904e SQL \u8a9e\u53e5\u9032\u884c\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 PostgreSQL \u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>UPDATE users\nSET addresses = array_remove(addresses, '\u820a\u5730\u5740')\nWHERE user_id = 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 <code>array_remove<\/code> \u51fd\u6578\u4f86\u5f9e\u7528\u6236\u7684\u5730\u5740\u6578\u7d44\u4e2d\u522a\u9664\u7279\u5b9a\u7684\u5730\u5740\u3002\u9019\u7a2e\u65b9\u6cd5\u7c21\u55ae\u660e\u4e86\uff0c\u9069\u5408\u7528\u65bc\u5c0f\u578b\u6578\u64da\u96c6\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-pl-pgsql-%e5%87%bd%e6%95%b8-vuYtWvfkgI\">2. \u4f7f\u7528 PL\/pgSQL \u51fd\u6578<\/h3>\n<p>\u5c0d\u65bc\u66f4\u8907\u96dc\u7684\u522a\u9664\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 PL\/pgSQL \u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u51fd\u6578\uff0c\u7528\u65bc\u522a\u9664\u6578\u7d44\u4e2d\u7684\u6240\u6709\u7a7a\u503c\uff1a<\/p>\n<pre><code>CREATE OR REPLACE FUNCTION remove_empty_addresses(user_id INT) RETURNS VOID AS $$\nBEGIN\n    UPDATE users\n    SET addresses = ARRAY(SELECT unnest(addresses) WHERE unnest(addresses) IS NOT NULL)\n    WHERE user_id = user_id;\nEND;\n$$ LANGUAGE plpgsql;<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u901a\u904e\u4f7f\u7528 <code>unnest<\/code> \u51fd\u6578\u4f86\u5c55\u958b\u6578\u7d44\uff0c\u7136\u5f8c\u904e\u6ffe\u6389\u7a7a\u503c\uff0c\u6700\u5f8c\u518d\u5c07\u7d50\u679c\u8f49\u63db\u56de\u6578\u7d44\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-nosql-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95-vuYtWvfkgI\">3. \u4f7f\u7528 NoSQL \u6578\u64da\u5eab\u7684\u522a\u9664\u65b9\u6cd5<\/h3>\n<p>\u5728 NoSQL \u6578\u64da\u5eab\u4e2d\uff0c\u6578\u7d44\u7684\u522a\u9664\u65b9\u6cd5\u53ef\u80fd\u6703\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u5728 MongoDB \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u522a\u9664\u6578\u7d44\u4e2d\u7684\u7279\u5b9a\u5143\u7d20\uff1a<\/p>\n<pre><code>db.users.update(\n    { user_id: 1 },\n    { $pull: { addresses: '\u820a\u5730\u5740' } }\n);<\/code><\/pre>\n<p>\u9019\u88e1\u7684 <code>$pull<\/code> \u64cd\u4f5c\u7b26\u7528\u65bc\u5f9e\u6578\u7d44\u4e2d\u522a\u9664\u5339\u914d\u7684\u5143\u7d20\uff0c\u9019\u4f7f\u5f97\u64cd\u4f5c\u8b8a\u5f97\u975e\u5e38\u7c21\u55ae\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-vuYtWvfkgI\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u6578\u7d44\u4e2d\u7684\u5143\u7d20\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u522a\u9664\u64cd\u4f5c\u4e0d\u6703\u5f71\u97ff\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u5728\u9032\u884c\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u6700\u597d\u5148\u5099\u4efd\u6578\u64da\u3002<\/li>\n<li>\u8003\u616e\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-vuYtWvfkgI\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u4e2d\u7684\u6578\u7d44\u522a\u9664\u65b9\u6cd5\u591a\u7a2e\u591a\u6a23\uff0c\u6839\u64da\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u9078\u64c7\u5408\u9069\u7684\u522a\u9664\u65b9\u5f0f\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u4f7f\u7528 SQL \u8a9e\u53e5\u3001PL\/pgSQL \u51fd\u6578\u9084\u662f NoSQL \u7684\u64cd\u4f5c\u7b26\uff0c\u4e86\u89e3\u9019\u4e9b\u65b9\u6cd5\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u7a69\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u4e2d\u6578\u7d44\u522a\u9664\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u5f9e\u6578\u7d44\u4e2d\u522a\u9664\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-187760","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187760","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=187760"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187760\/revisions"}],"predecessor-version":[{"id":187761,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187760\/revisions\/187761"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187760"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}