{"id":20790,"date":"2024-01-02T05:59:24","date_gmt":"2024-01-02T05:59:24","guid":{"rendered":"https:\/\/server.hk\/blog\/20790\/"},"modified":"2024-11-14T10:38:37","modified_gmt":"2024-11-14T02:38:37","slug":"postgresql-command-create-event-trigger","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20790\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aCREATE EVENT TRIGGER"},"content":{"rendered":"<h1 id=\"postgresql-command-create-event-trigger-qRtDQJDyQb\">PostgreSQL \u547d\u4ee4\uff1aCREATE EVENT TRIGGER<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u7279\u6027\u3002PostgreSQL \u7684\u4e00\u500b\u95dc\u9375\u529f\u80fd\u662f\u80fd\u5920\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668\uff0c\u8b93\u7528\u6236\u53ef\u4ee5\u5b9a\u7fa9\u81ea\u8a02\u52d5\u4f5c\uff0c\u7576\u6578\u64da\u5eab\u4e2d\u767c\u751f\u7279\u5b9a\u4e8b\u4ef6\u6642\uff0c\u9019\u4e9b\u52d5\u4f5c\u6703\u81ea\u52d5\u57f7\u884c\u3002<\/p>\n<h2 id=\"what-is-an-event-trigger-qRtDQJDyQb\">\u751a\u9ebc\u662f\u4e8b\u4ef6\u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u4e8b\u4ef6\u89f8\u767c\u5668\u662f PostgreSQL \u4e2d\u7684\u4e00\u500b\u5177\u540d\u5c0d\u8c61\uff0c\u8207\u7279\u5b9a\u7684\u4e8b\u4ef6\u985e\u578b\u76f8\u95dc\u806f\u3002\u7576\u6307\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u8207\u4e8b\u4ef6\u89f8\u767c\u5668\u95dc\u806f\u7684\u89f8\u767c\u51fd\u6578\u6703\u88ab\u57f7\u884c\u3002\u4e8b\u4ef6\u89f8\u767c\u5668\u63d0\u4f9b\u4e86\u4e00\u7a2e\u64f4\u5c55 PostgreSQL \u529f\u80fd\u7684\u65b9\u6cd5\uff0c\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u8a02\u52d5\u4f5c\uff0c\u9019\u4e9b\u52d5\u4f5c\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u5275\u5efa\u3001\u8868\u683c\u5275\u5efa\uff0c\u751a\u81f3\u7279\u5b9a SQL \u8a9e\u53e5\u57f7\u884c\u6642\u89f8\u767c\u3002<\/p>\n<h2 id=\"creating-an-event-trigger-qRtDQJDyQb\">\u5982\u4f55\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668<\/h2>\n<p>CREATE EVENT TRIGGER \u547d\u4ee4\u7528\u65bc\u5728 PostgreSQL \u4e2d\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668\u3002\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE EVENT TRIGGER trigger_name\r\n    ON event_type\r\n    [ WHEN filter_condition ]\r\n    EXECUTE FUNCTION trigger_function();\r\n<\/code><\/pre>\n<p>\u6211\u5011\u4f86\u5206\u89e3 CREATE EVENT TRIGGER \u547d\u4ee4\u7684\u5404\u500b\u7d44\u4ef6\uff1a<\/p>\n<ul>\n<li><code>trigger_name<\/code>\uff1a\u9019\u662f\u60a8\u8981\u5275\u5efa\u7684\u4e8b\u4ef6\u89f8\u767c\u5668\u7684\u540d\u7a31\uff0c\u61c9\u5728\u6578\u64da\u5eab\u4e2d\u552f\u4e00\u3002<\/li>\n<li><code>event_type<\/code>\uff1a\u9019\u6307\u5b9a\u4e86\u89f8\u767c\u5668\u95dc\u806f\u7684\u4e8b\u4ef6\u985e\u578b\u3002PostgreSQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u985e\u578b\u7684\u4e8b\u4ef6\uff0c\u5305\u62ec\u8207\u6578\u64da\u5eab\u76f8\u95dc\u7684\u4e8b\u4ef6\uff08\u5982\u6578\u64da\u5eab\u5275\u5efa\u3001\u6578\u64da\u5eab\u522a\u9664\uff09\u3001\u8207\u8868\u683c\u76f8\u95dc\u7684\u4e8b\u4ef6\uff08\u5982\u8868\u683c\u5275\u5efa\u3001\u8868\u683c\u522a\u9664\uff09\u4ee5\u53ca\u8207\u8a9e\u53e5\u76f8\u95dc\u7684\u4e8b\u4ef6\uff08\u5982\u7279\u5b9a SQL \u8a9e\u53e5\uff09\u3002<\/li>\n<li><code>filter_condition<\/code>\uff08\u53ef\u9078\uff09\uff1a\u9019\u5141\u8a31\u60a8\u6307\u5b9a\u4e00\u500b\u689d\u4ef6\uff0c\u8a72\u689d\u4ef6\u5fc5\u9808\u70ba\u771f\u6642\uff0c\u89f8\u767c\u51fd\u6578\u624d\u6703\u57f7\u884c\u3002\u5982\u679c\u689d\u4ef6\u8a55\u4f30\u70ba <code>TRUE<\/code>\uff0c\u5247\u57f7\u884c\u89f8\u767c\u51fd\u6578\uff1b\u5426\u5247\uff0c\u5c07\u8df3\u904e\u57f7\u884c\u3002<\/li>\n<li><code>trigger_function<\/code>\uff1a\u9019\u662f\u7576\u4e8b\u4ef6\u89f8\u767c\u5668\u89f8\u767c\u6642\u8981\u57f7\u884c\u7684\u51fd\u6578\u540d\u7a31\u3002\u8a72\u51fd\u6578\u5fc5\u9808\u5728\u6578\u64da\u5eab\u4e2d\u5b9a\u7fa9\uff0c\u4e26\u4e14\u61c9\u5177\u6709\u57fa\u65bc\u4e8b\u4ef6\u985e\u578b\u7684\u9069\u7576\u53c3\u6578\u548c\u8fd4\u56de\u985e\u578b\u3002<\/li>\n<\/ul>\n<h2 id=\"example-creating-an-event-trigger-qRtDQJDyQb\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5275\u5efa\u4e00\u500b\u4e8b\u4ef6\u89f8\u767c\u5668\uff0c\u7576\u6211\u5011\u7684 PostgreSQL \u6578\u64da\u5eab\u4e2d\u5275\u5efa\u65b0\u8868\u6642\uff0c\u81ea\u52d5\u8a18\u9304\u8a72\u64cd\u4f5c\u3002\u6211\u5011\u53ef\u4ee5\u901a\u904e\u5275\u5efa\u4e00\u500b\u8207 <code>ddl_command_end<\/code> \u4e8b\u4ef6\u985e\u578b\u76f8\u95dc\u806f\u7684\u4e8b\u4ef6\u89f8\u767c\u5668\u4f86\u5be6\u73fe\u9019\u4e00\u9ede\uff0c\u8a72\u985e\u578b\u6703\u5728\u57f7\u884c\u4efb\u4f55 DDL\uff08\u6578\u64da\u5b9a\u7fa9\u8a9e\u8a00\uff09\u547d\u4ee4\u5f8c\u89f8\u767c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE EVENT TRIGGER log_table_creation\r\n    ON ddl_command_end\r\n    EXECUTE FUNCTION log_table_creation_function();\r\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5047\u8a2d <code>log_table_creation_function()<\/code> \u51fd\u6578\u5df2\u7d93\u5728\u6578\u64da\u5eab\u4e2d\u5b9a\u7fa9\u3002\u6b64\u51fd\u6578\u53ef\u4ee5\u5be6\u73fe\u70ba\u57f7\u884c\u4efb\u4f55\u6240\u9700\u64cd\u4f5c\uff0c\u4f8b\u5982\u5c07\u8868\u683c\u5275\u5efa\u7684\u8a73\u60c5\u8a18\u9304\u5230\u53e6\u4e00\u500b\u8868\u4e2d\uff0c\u6216\u5411\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u767c\u9001\u901a\u77e5\u3002<\/p>\n<h2 id=\"summary-qRtDQJDyQb\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 CREATE EVENT TRIGGER \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u8a02\u52d5\u4f5c\uff0c\u9019\u4e9b\u52d5\u4f5c\u6703\u5728\u6578\u64da\u5eab\u4e2d\u767c\u751f\u7279\u5b9a\u4e8b\u4ef6\u6642\u81ea\u52d5\u57f7\u884c\u3002\u4e8b\u4ef6\u89f8\u767c\u5668\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5f37\u5927\u7684\u65b9\u6cd5\u4f86\u64f4\u5c55 PostgreSQL \u7684\u529f\u80fd\u4e26\u81ea\u52d5\u5316\u5404\u7a2e\u4efb\u52d9\u3002\u901a\u904e\u5275\u5efa\u4e8b\u4ef6\u89f8\u767c\u5668\uff0c\u7528\u6236\u53ef\u4ee5\u5b9a\u7fa9\u81ea\u8a02\u52d5\u4f5c\uff0c\u9019\u4e9b\u52d5\u4f5c\u53ef\u7531\u6578\u64da\u5eab\u5275\u5efa\u3001\u8868\u683c\u5275\u5efa\u6216\u7279\u5b9a\u7684 SQL \u8a9e\u53e5\u6240\u89f8\u767c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u63f4\u60a8\u7684 PostgreSQL \u6578\u64da\u5eab\uff0c\u8acb\u8003\u616e <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002Server.HK \u63d0\u4f9b\u5353\u8d8a\u7684\u6027\u80fd\u548c\u512a\u8cea\u7684\u5ba2\u6236\u652f\u63f4\uff0c\u64c1\u6709\u4e00\u7cfb\u5217\u91dd\u5c0d\u60a8\u5177\u9ad4\u9700\u6c42\u7684 VPS \u8a17\u7ba1\u8a08\u5283\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u547d\u4ee4\uff1aCR&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-20790","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20790","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=20790"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20790\/revisions"}],"predecessor-version":[{"id":24308,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20790\/revisions\/24308"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}