{"id":96932,"date":"2024-10-20T13:34:17","date_gmt":"2024-10-20T05:34:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96932\/"},"modified":"2024-10-20T13:34:18","modified_gmt":"2024-10-20T05:34:18","slug":"postgresql%e4%b9%8b%e6%99%82%e9%96%93%e6%88%b3%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96932\/","title":{"rendered":"PostgreSQL\u4e4b\u6642\u9593\u6233\u81ea\u52d5\u66f4\u65b0"},"content":{"rendered":"<h1 id=\"postgresql%e4%b9%8b%e6%99%82%e9%96%93%e6%88%b3%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0-mbhwadrCbs\">PostgreSQL\u4e4b\u6642\u9593\u6233\u81ea\u52d5\u66f4\u65b0<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6642\u9593\u6233\uff08timestamp\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u8a18\u9304\u6578\u64da\u7684\u5275\u5efa\u548c\u66f4\u65b0\u6642\u9593\u3002\u5728PostgreSQL\u4e2d\uff0c\u6642\u9593\u6233\u7684\u81ea\u52d5\u66f4\u65b0\u529f\u80fd\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728PostgreSQL\u4e2d\u5be6\u73fe\u6642\u9593\u6233\u7684\u81ea\u52d5\u66f4\u65b0\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e6%99%82%e9%96%93%e6%88%b3%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-mbhwadrCbs\">\u6642\u9593\u6233\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6642\u9593\u6233\u662f\u4e00\u7a2e\u7528\u65bc\u8868\u793a\u7279\u5b9a\u6642\u9593\u9ede\u7684\u6578\u64da\u985e\u578b\u3002\u5728PostgreSQL\u4e2d\uff0c\u6642\u9593\u6233\u6709\u5169\u7a2e\u4e3b\u8981\u985e\u578b\uff1a<code>timestamp without time zone<\/code>\u548c<code>timestamp with time zone<\/code>\u3002\u524d\u8005\u4e0d\u5305\u542b\u6642\u5340\u4fe1\u606f\uff0c\u800c\u5f8c\u8005\u5247\u6703\u8003\u616e\u6642\u5340\u7684\u5f71\u97ff\u3002\u9019\u4f7f\u5f97\u6642\u9593\u6233\u5728\u5168\u7403\u5316\u61c9\u7528\u4e2d\u8b8a\u5f97\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0%e6%99%82%e9%96%93%e6%88%b3%e7%9a%84%e9%9c%80%e6%b1%82-mbhwadrCbs\">\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233\u7684\u9700\u6c42<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u958b\u767c\u8005\u9700\u8981\u5728\u6bcf\u6b21\u66f4\u65b0\u8a18\u9304\u6642\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u689d\u8a18\u9304\u90fd\u80fd\u6e96\u78ba\u53cd\u6620\u5176\u6700\u5f8c\u4fee\u6539\u7684\u6642\u9593\u3002\u624b\u52d5\u66f4\u65b0\u6642\u9593\u6233\u4e0d\u50c5\u7e41\u7463\uff0c\u9084\u5bb9\u6613\u51fa\u932f\uff0c\u56e0\u6b64\u81ea\u52d5\u5316\u7684\u89e3\u6c7a\u65b9\u6848\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%a7%b8%e7%99%bc%e5%99%a8%e5%af%a6%e7%8f%be%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0-mbhwadrCbs\">\u4f7f\u7528\u89f8\u767c\u5668\u5be6\u73fe\u81ea\u52d5\u66f4\u65b0<\/h2>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u89f8\u767c\u5668\uff08trigger\uff09\u4f86\u5be6\u73fe\u6642\u9593\u6233\u7684\u81ea\u52d5\u66f4\u65b0\u3002\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u51fd\u6578\uff0c\u7576\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\uff08\u5982\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\uff09\uff0c\u5b83\u6703\u81ea\u52d5\u57f7\u884c\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5275\u5efa\u4e00\u500b\u89f8\u767c\u5668\u4f86\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233\u7684\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e8%a1%a8-mbhwadrCbs\">1. \u5275\u5efa\u4e00\u500b\u8868<\/h3>\n<pre><code>CREATE TABLE example_table (\n    id SERIAL PRIMARY KEY,\n    data TEXT,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<h3 id=\"2-%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8%e5%87%bd%e6%95%b8-mbhwadrCbs\">2. \u5275\u5efa\u89f8\u767c\u5668\u51fd\u6578<\/h3>\n<pre><code>CREATE OR REPLACE FUNCTION update_timestamp()\nRETURNS TRIGGER AS $$\nBEGIN\n    NEW.updated_at = CURRENT_TIMESTAMP;\n    RETURN NEW;\nEND;\n$$ LANGUAGE plpgsql;<\/code><\/pre>\n<h3 id=\"3-%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8-mbhwadrCbs\">3. \u5275\u5efa\u89f8\u767c\u5668<\/h3>\n<pre><code>CREATE TRIGGER update_example_table_timestamp\nBEFORE UPDATE ON example_table\nFOR EACH ROW\nEXECUTE FUNCTION update_timestamp();<\/code><\/pre>\n<p>\u4ee5\u4e0a\u6b65\u9a5f\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba<code>example_table<\/code>\u7684\u8868\uff0c\u4e26\u5b9a\u7fa9\u4e86<code>created_at<\/code>\u548c<code>updated_at<\/code>\u5169\u500b\u6642\u9593\u6233\u5b57\u6bb5\u3002\u63a5\u8457\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u89f8\u767c\u5668\u51fd\u6578<code>update_timestamp<\/code>\uff0c\u8a72\u51fd\u6578\u5728\u6bcf\u6b21\u66f4\u65b0\u8a18\u9304\u6642\u81ea\u52d5\u5c07<code>updated_at<\/code>\u5b57\u6bb5\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\u3002\u6700\u5f8c\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u89f8\u767c\u5668\uff0c\u5c07\u5176\u8207<code>example_table<\/code>\u8868\u7684\u66f4\u65b0\u64cd\u4f5c\u95dc\u806f\u8d77\u4f86\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-mbhwadrCbs\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u5408\u9069\u7684\u6642\u9593\u6233\u985e\u578b\uff1a<\/strong>\u6839\u64da\u61c9\u7528\u9700\u6c42\u9078\u64c7<code>timestamp without time zone<\/code>\u6216<code>timestamp with time zone<\/code>\u3002<\/li>\n<li><strong>\u5b9a\u671f\u6aa2\u67e5\u6578\u64da\uff1a<\/strong>\u78ba\u4fdd\u6642\u9593\u6233\u5b57\u6bb5\u7684\u6e96\u78ba\u6027\uff0c\u5b9a\u671f\u9032\u884c\u6578\u64da\u6aa2\u67e5\u3002<\/li>\n<li><strong>\u8003\u616e\u6027\u80fd\u5f71\u97ff\uff1a<\/strong>\u5728\u9ad8\u983b\u7387\u66f4\u65b0\u7684\u60c5\u6cc1\u4e0b\uff0c\u89f8\u767c\u5668\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u9700\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-mbhwadrCbs\">\u7d50\u8ad6<\/h2>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\u3002\u901a\u904e\u4f7f\u7528\u89f8\u767c\u5668\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u5f9e\u800c\u6e1b\u5c11\u624b\u52d5\u64cd\u4f5c\u7684\u932f\u8aa4\u548c\u7e41\u7463\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u61c9\u7528\u4f86\u8aaa\uff0c\u9019\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u6280\u8853\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc<code>VPS<\/code>\u3001<code>\u9999\u6e2fVPS<\/code>\u53ca\u5176\u4ed6\u76f8\u95dc\u670d\u52d9\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3PostgreSQL\u4e2d\u6642\u9593\u6233\u81ea\u52d5\u66f4\u65b0\u7684\u529f\u80fd\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u8207\u4e00\u81f4\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-96932","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96932","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=96932"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96932\/revisions"}],"predecessor-version":[{"id":96933,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96932\/revisions\/96933"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}