{"id":167999,"date":"2024-11-06T08:40:18","date_gmt":"2024-11-06T00:40:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/167999\/"},"modified":"2024-11-06T08:40:19","modified_gmt":"2024-11-06T00:40:19","slug":"%e8%81%8a%e8%81%8apg%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e9%98%b2%e8%aa%a4%e5%88%aa%e9%99%a4%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/167999\/","title":{"rendered":"\u804a\u804aPG\u6578\u64da\u5eab\u7684\u9632\u8aa4\u522a\u9664\u554f\u984c"},"content":{"rendered":"<h1 id=\"%e8%81%8a%e8%81%8apg%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e9%98%b2%e8%aa%a4%e5%88%aa%e9%99%a4%e5%95%8f%e9%a1%8c-gaewyyspmC\">\u804a\u804aPG\u6578\u64da\u5eab\u7684\u9632\u8aa4\u522a\u9664\u554f\u984c<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002PostgreSQL\uff08\u7c21\u7a31PG\uff09\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u4fdd\u8b77\u6578\u64da\u4e0d\u88ab\u8aa4\u522a\u9664\u3002\u672c\u6587\u5c07\u63a2\u8a0ePG\u6578\u64da\u5eab\u7684\u9632\u8aa4\u522a\u9664\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u89e3\u6c7a\u65b9\u6848\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e8%aa%a4%e5%88%aa%e9%99%a4%e7%9a%84%e9%a2%a8%e9%9a%aa-gaewyyspmC\">\u8aa4\u522a\u9664\u7684\u98a8\u96aa<\/h2>\n<p>\u8aa4\u522a\u9664\u6578\u64da\u7684\u60c5\u6cc1\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e26\u4e0d\u5c11\u898b\u3002\u7121\u8ad6\u662f\u56e0\u70ba\u64cd\u4f5c\u5931\u8aa4\u3001\u932f\u8aa4\u7684SQL\u67e5\u8a62\uff0c\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u7684bug\uff0c\u9019\u4e9b\u90fd\u53ef\u80fd\u5c0e\u81f4\u91cd\u8981\u6578\u64da\u7684\u4e1f\u5931\u3002\u5c0d\u65bc\u4f01\u696d\u4f86\u8aaa\uff0c\u6578\u64da\u7684\u4e1f\u5931\u53ef\u80fd\u6703\u9020\u6210\u91cd\u5927\u7684\u7d93\u6fdf\u640d\u5931\u548c\u4fe1\u8b7d\u640d\u5bb3\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u9632\u6b62\u8aa4\u522a\u9664\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<h2 id=\"postgresql%e7%9a%84%e9%98%b2%e8%aa%a4%e5%88%aa%e9%99%a4%e6%a9%9f%e5%88%b6-gaewyyspmC\">PostgreSQL\u7684\u9632\u8aa4\u522a\u9664\u6a5f\u5236<\/h2>\n<p>PostgreSQL\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5167\u5efa\u7684\u6a5f\u5236\u4f86\u5e6b\u52a9\u7528\u6236\u9632\u6b62\u8aa4\u522a\u9664\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u4e3b\u8981\u7684\u9632\u8b77\u63aa\u65bd\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e4%ba%8b%e5%8b%99-gaewyyspmC\">1. \u4f7f\u7528\u4e8b\u52d9<\/h3>\n<p>PostgreSQL\u652f\u6301\u4e8b\u52d9\uff0c\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u5c07\u591a\u500b\u64cd\u4f5c\u5305\u88dd\u5728\u4e00\u500b\u4e8b\u52d9\u4e2d\u3002\u5982\u679c\u5728\u4e8b\u52d9\u4e2d\u767c\u751f\u932f\u8aa4\uff0c\u5247\u53ef\u4ee5\u56de\u6efe\u6240\u6709\u64cd\u4f5c\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u7684\u640d\u5931\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u4e8b\u52d9\u793a\u4f8b\uff1a<\/p>\n<pre><code>BEGIN;\n\nDELETE FROM users WHERE id = 1;\n\n-- \u5982\u679c\u767c\u751f\u932f\u8aa4\uff0c\u53ef\u4ee5\u56de\u6efe\nROLLBACK;\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8delete%e8%aa%9e%e5%8f%a5%e7%9a%84where%e6%a2%9d%e4%bb%b6-gaewyyspmC\">2. \u4f7f\u7528DELETE\u8a9e\u53e5\u7684WHERE\u689d\u4ef6<\/h3>\n<p>\u5728\u57f7\u884cDELETE\u64cd\u4f5c\u6642\uff0c\u59cb\u7d42\u61c9\u8a72\u4f7f\u7528WHERE\u689d\u4ef6\u4f86\u9650\u5236\u522a\u9664\u7684\u7bc4\u570d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DELETE FROM orders WHERE order_date &lt; '2023-01-01';\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u53ea\u6709\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u88ab\u522a\u9664\uff0c\u5f9e\u800c\u964d\u4f4e\u8aa4\u522a\u9664\u7684\u98a8\u96aa\u3002<\/p>\n<h3 id=\"3-%e5%af%a6%e6%96%bd%e6%95%b8%e6%93%9a%e5%82%99%e4%bb%bd-gaewyyspmC\">3. \u5be6\u65bd\u6578\u64da\u5099\u4efd<\/h3>\n<p>\u5b9a\u671f\u5099\u4efd\u6578\u64da\u662f\u9632\u6b62\u6578\u64da\u4e1f\u5931\u7684\u6709\u6548\u65b9\u6cd5\u3002PostgreSQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u5099\u4efd\u9078\u9805\uff0c\u5305\u62ec\u908f\u8f2f\u5099\u4efd\u548c\u7269\u7406\u5099\u4efd\u3002\u7528\u6236\u53ef\u4ee5\u4f7f\u7528pg_dump\u5de5\u5177\u9032\u884c\u908f\u8f2f\u5099\u4efd\uff1a<\/p>\n<pre><code>pg_dump dbname &gt; dbname_backup.sql\n<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u5373\u4f7f\u6578\u64da\u88ab\u8aa4\u522a\u9664\uff0c\u4e5f\u53ef\u4ee5\u901a\u904e\u5099\u4efd\u6062\u5fa9\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e8%a7%b8%e7%99%bc%e5%99%a8-gaewyyspmC\">4. \u4f7f\u7528\u89f8\u767c\u5668<\/h3>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u64cd\u4f5c\u3002\u7528\u6236\u53ef\u4ee5\u5275\u5efa\u89f8\u767c\u5668\u4f86\u9632\u6b62\u522a\u9664\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5275\u5efa\u4e00\u500bBEFORE DELETE\u89f8\u767c\u5668\u4f86\u6aa2\u67e5\u522a\u9664\u689d\u4ef6\uff0c\u4e26\u6839\u64da\u9700\u8981\u963b\u6b62\u522a\u9664\uff1a<\/p>\n<pre><code>CREATE OR REPLACE FUNCTION prevent_delete()\nRETURNS TRIGGER AS $$\nBEGIN\n    IF OLD.is_protected THEN\n        RAISE EXCEPTION 'Cannot delete protected record';\n    END IF;\n    RETURN OLD;\nEND;\n$$ LANGUAGE plpgsql;\n\nCREATE TRIGGER prevent_delete_trigger\nBEFORE DELETE ON users\nFOR EACH ROW EXECUTE FUNCTION prevent_delete();\n<\/code><\/pre>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-gaewyyspmC\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u9664\u4e86\u4e0a\u8ff0\u63aa\u65bd\uff0c\u9084\u6709\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u9032\u4e00\u6b65\u6e1b\u5c11\u8aa4\u522a\u9664\u7684\u98a8\u96aa\uff1a<\/p>\n<ul>\n<li>\u5b9a\u671f\u5be9\u67e5\u548c\u66f4\u65b0\u6578\u64da\u5eab\u6b0a\u9650\uff0c\u78ba\u4fdd\u53ea\u6709\u6388\u6b0a\u7528\u6236\u53ef\u4ee5\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u4f7f\u7528\u6e2c\u8a66\u74b0\u5883\u9032\u884c\u64cd\u4f5c\uff0c\u78ba\u4fdd\u4e0d\u6703\u5c0d\u5be6\u969b\u6578\u64da\u9020\u6210\u5f71\u97ff\u3002<\/li>\n<li>\u4f7f\u7528\u65e5\u8a8c\u8a18\u9304\u6240\u6709\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u5728\u9700\u8981\u6642\u9032\u884c\u5be9\u8a08\u548c\u6062\u5fa9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gaewyyspmC\">\u7e3d\u7d50<\/h2>\n<p>\u9632\u6b62PG\u6578\u64da\u5eab\u4e2d\u7684\u8aa4\u522a\u9664\u554f\u984c\u662f\u6bcf\u500b\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5fc5\u9808\u91cd\u8996\u7684\u8ab2\u984c\u3002\u901a\u904e\u4f7f\u7528\u4e8b\u52d9\u3001WHERE\u689d\u4ef6\u3001\u5b9a\u671f\u5099\u4efd\u548c\u89f8\u767c\u5668\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u8aa4\u522a\u9664\u7684\u98a8\u96aa\u3002\u6b64\u5916\uff0c\u9075\u5faa\u6700\u4f73\u5be6\u8e10\u5c07\u9032\u4e00\u6b65\u589e\u5f37\u6578\u64da\u7684\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u5b89\u5168\u6578\u64da\u5b58\u5132\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u8a0ePG\u6578\u64da\u5eab\u4e2d\u7684\u9632\u8aa4\u522a\u9664\u554f\u984c\uff0c\u5206\u6790\u5e38\u898b\u98a8\u96aa\u53ca\u6709\u6548\u7684\u9810\u9632\u63aa\u65bd\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u8207\u5b8c\u6574\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-167999","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167999","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=167999"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167999\/revisions"}],"predecessor-version":[{"id":168000,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167999\/revisions\/168000"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=167999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=167999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=167999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}