{"id":20647,"date":"2024-01-02T05:17:22","date_gmt":"2024-01-02T05:17:22","guid":{"rendered":"https:\/\/server.hk\/blog\/20647\/"},"modified":"2024-11-14T10:39:24","modified_gmt":"2024-11-14T02:39:24","slug":"postgresql-command-notify","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20647\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aNOTIFY"},"content":{"rendered":"

PostgreSQL \u6307\u4ee4\uff1aNOTIFY<\/h1>\n

PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u7279\u6027\u3002\u5728 PostgreSQL \u4e2d\uff0c\u4e00\u500b\u8f03\u5c11\u4eba\u77e5\u4f46\u975e\u5e38\u5be6\u7528\u7684\u6307\u4ee4\u662f NOTIFY\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e NOTIFY \u6307\u4ee4\u53ca\u5176\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n

\u4ec0\u9ebc\u662f NOTIFY\uff1f<\/h2>\n

PostgreSQL \u4e2d\u7684 NOTIFY \u6307\u4ee4\u5141\u8a31\u5728\u8cc7\u6599\u5eab\u5167\u9032\u884c\u9032\u7a0b\u9593\u901a\u4fe1\u3002\u5b83\u4f7f\u5f97\u4e00\u500b\u8cc7\u6599\u5eab\u6703\u8a71\u80fd\u5920\u901a\u77e5\u5176\u4ed6\u6703\u8a71\u6709\u95dc\u8cc7\u6599\u5eab\u4e2d\u7684\u7279\u5b9a\u4e8b\u4ef6\u6216\u8b8a\u66f4\u3002\u9019\u7a2e\u901a\u77e5\u53ef\u4ee5\u89f8\u767c\u63a5\u6536\u6703\u8a71\u4e2d\u7684\u52d5\u4f5c\u6216\u66f4\u65b0\uff0c\u4f7f\u5176\u6210\u70ba\u5be6\u6642\u6578\u64da\u540c\u6b65\u548c\u4e8b\u4ef6\u9a45\u52d5\u67b6\u69cb\u7684\u5bf6\u8cb4\u5de5\u5177\u3002<\/p>\n

NOTIFY \u5982\u4f55\u904b\u4f5c\uff1f<\/h2>\n

NOTIFY \u6307\u4ee4\u7531\u5169\u500b\u90e8\u5206\u7d44\u6210\uff1a\u767c\u9001\u8005\u548c\u63a5\u6536\u8005\u3002\u767c\u9001\u8005\u4f7f\u7528 NOTIFY \u6307\u4ee4\u5411\u8cc7\u6599\u5eab\u767c\u9001\u4e00\u500b\u6307\u5b9a\u540d\u7a31\u7684\u901a\u77e5\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u63a5\u6536\u8005\u4f7f\u7528 LISTEN \u6307\u4ee4\u4f86\u76e3\u807d\u5177\u6709\u7279\u5b9a\u540d\u7a31\u7684\u901a\u77e5\u3002\u4e00\u65e6\u63a5\u6536\u5230\u5339\u914d\u540d\u7a31\u7684\u901a\u77e5\uff0c\u63a5\u6536\u8005\u5c31\u53ef\u4ee5\u57f7\u884c\u5fc5\u8981\u7684\u52d5\u4f5c\u6216\u66f4\u65b0\u3002<\/p>\n

\u9019\u88e1\u6709\u4e00\u500b\u7bc4\u4f8b\u4f86\u8aaa\u660e NOTIFY \u7684\u7528\u6cd5\uff1a<\/p>\n

-- \u767c\u9001\u8005\u6703\u8a71\r\nNOTIFY new_order;\r\n\r\n-- \u63a5\u6536\u8005\u6703\u8a71\r\nLISTEN new_order;\r\nWAITING FOR 'new_order';\r\n-- \u63a5\u6536\u5230\u901a\u77e5\u5f8c\u57f7\u884c\u52d5\u4f5c\u6216\u66f4\u65b0\r\n<\/code><\/pre>\n
\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u767c\u9001\u8005\u6703\u8a71\u4f7f\u7528 NOTIFY \u6307\u4ee4\u767c\u9001\u540d\u70ba ‘new_order’ \u7684\u901a\u77e5\u3002\u63a5\u6536\u8005\u6703\u8a71\u5728\u4e4b\u524d\u5df2\u57f7\u884c LISTEN \u6307\u4ee4\u4f86\u76e3\u807d ‘new_order’\uff0c\u5b83\u7b49\u5f85\u901a\u77e5\u4e26\u5728\u6536\u5230\u901a\u77e5\u5f8c\u57f7\u884c\u6240\u9700\u7684\u52d5\u4f5c\u6216\u66f4\u65b0\u3002<\/p>\n
NOTIFY \u7684\u4f7f\u7528\u6848\u4f8b<\/h2>\n
NOTIFY \u6307\u4ee4\u5728\u591a\u7a2e\u60c5\u5883\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u5305\u62ec\uff1a<\/p>\n
\u5be6\u6642\u6578\u64da\u540c\u6b65<\/h3>\n
\u7576\u591a\u500b\u6703\u8a71\u6216\u61c9\u7528\u7a0b\u5f0f\u8a2a\u554f\u540c\u4e00\u8cc7\u6599\u5eab\u6642\uff0cNOTIFY \u53ef\u4ee5\u7528\u4f86\u4fdd\u6301\u5b83\u5011\u7684\u540c\u6b65\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u6703\u8a71\u5728\u8868\u4e2d\u63d2\u5165\u4e86\u4e00\u689d\u65b0\u8a18\u9304\uff0c\u5b83\u53ef\u4ee5\u767c\u9001\u901a\u77e5\u7d66\u5176\u4ed6\u6703\u8a71\uff0c\u4ee5\u4fbf\u5b83\u5011\u76f8\u61c9\u5730\u66f4\u65b0\u6578\u64da\u3002<\/p>\n
\u4e8b\u4ef6\u9a45\u52d5\u67b6\u69cb<\/h3>\n
\u4f7f\u7528 NOTIFY\uff0c\u60a8\u53ef\u4ee5\u69cb\u5efa\u4e8b\u4ef6\u9a45\u52d5\u67b6\u69cb\uff0c\u8b93\u61c9\u7528\u7a0b\u5f0f\u7684\u4e0d\u540c\u90e8\u5206\u5c0d\u7279\u5b9a\u4e8b\u4ef6\u505a\u51fa\u53cd\u61c9\u3002\u4f8b\u5982\uff0c\u7576\u7528\u6236\u5b8c\u6210\u8cfc\u8cb7\u6642\uff0c\u60a8\u53ef\u4ee5\u901a\u77e5\u5176\u4ed6\u6703\u8a71\uff0c\u89f8\u767c\u5982\u767c\u9001\u78ba\u8a8d\u96fb\u5b50\u90f5\u4ef6\u6216\u66f4\u65b0\u5eab\u5b58\u7b49\u52d5\u4f5c\u3002<\/p>\n
\u975e\u540c\u6b65\u8655\u7406<\/h3>\n
\u901a\u904e\u5c07 NOTIFY \u8207\u5176\u4ed6 PostgreSQL \u529f\u80fd\u5982 LISTEN \u548c\u89f8\u767c\u5668\u7d50\u5408\u4f7f\u7528\uff0c\u60a8\u53ef\u4ee5\u5be6\u73fe\u975e\u540c\u6b65\u8655\u7406\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u6709\u4e00\u500b\u89f8\u767c\u5668\uff0c\u5728\u8868\u4e2d\u63d2\u5165\u65b0\u8a18\u9304\u6642\u767c\u9001\u901a\u77e5\uff0c\u4e26\u6709\u4e00\u500b\u55ae\u7368\u7684\u9032\u7a0b\u4f86\u76e3\u807d\u9019\u4e9b\u901a\u77e5\uff0c\u57f7\u884c\u8cc7\u6e90\u5bc6\u96c6\u578b\u7684\u4efb\u52d9\uff0c\u800c\u4e0d\u6703\u963b\u585e\u4e3b\u61c9\u7528\u7a0b\u5f0f\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
PostgreSQL \u4e2d\u7684 NOTIFY \u6307\u4ee4\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5f37\u5927\u7684\u8cc7\u6599\u5eab\u5167\u9032\u7a0b\u9593\u901a\u4fe1\u6a5f\u5236\u3002\u5b83\u4f7f\u5be6\u6642\u6578\u64da\u540c\u6b65\u3001\u4e8b\u4ef6\u9a45\u52d5\u67b6\u69cb\u548c\u975e\u540c\u6b65\u8655\u7406\u6210\u70ba\u53ef\u80fd\u3002\u901a\u904e\u5229\u7528 NOTIFY\uff0c\u60a8\u53ef\u4ee5\u589e\u5f37\u57fa\u65bc PostgreSQL \u7684\u61c9\u7528\u7a0b\u5f0f\u7684\u529f\u80fd\u548c\u97ff\u61c9\u80fd\u529b\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7e3d\u800c\u8a00\u4e4b\uff0cPostgreSQL \u4e2d\u7684 NOTIFY \u6307\u4ee4\u5141\u8a31\u5728\u8cc7\u6599\u5eab\u5167\u9032\u884c\u9032\u7a0b\u9593\u901a\u4fe1\u3002\u5b83\u4f7f\u4e00\u500b\u6703\u8a71\u80fd\u5920\u901a\u77e5\u5176\u4ed6\u6703\u8a71\u6709\u95dc\u7279\u5b9a\u4e8b\u4ef6\u6216\u8b8a\u66f4\u3002NOTIFY \u5c0d\u65bc\u5be6\u6642\u6578\u64da\u540c\u6b65\u3001\u4e8b\u4ef6\u9a45\u52d5\u67b6\u69cb\u548c\u975e\u540c\u6b65\u8655\u7406\u975e\u5e38\u6709\u7528\u3002\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc PostgreSQL \u53ca\u5176\u529f\u80fd\u7684\u4fe1\u606f\uff0c\u8acb\u8003\u616e\u63a2\u7d22 Server.HK<\/a>\uff0c\u9019\u662f\u4e00\u5bb6\u9818\u5148\u7684 VPS \u4e3b\u6a5f\u63d0\u4f9b\u5546\uff0c\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u80fd\u7684\u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
PostgreSQL \u6307\u4ee4\uff1aNO...<\/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-20647","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20647","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=20647"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20647\/revisions"}],"predecessor-version":[{"id":24365,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20647\/revisions\/24365"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20647"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20647"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20647"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}