{"id":20648,"date":"2024-01-02T05:18:23","date_gmt":"2024-01-02T05:18:23","guid":{"rendered":"https:\/\/server.hk\/blog\/20648\/"},"modified":"2024-11-14T10:39:23","modified_gmt":"2024-11-14T02:39:23","slug":"postgresql-command-unlisten","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20648\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aUNLISTEN"},"content":{"rendered":"<h1 id=\"postgresql-command-unlisten-nDSZtXeEwO\">PostgreSQL \u6307\u4ee4\uff1aUNLISTEN<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u548c\u7279\u6027\u3002<code>UNLISTEN<\/code> \u662f PostgreSQL \u4e2d\u8f03\u5c11\u4eba\u77e5\u9053\u4f46\u975e\u5e38\u5be6\u7528\u7684\u6307\u4ee4\u4e4b\u4e00\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e <code>UNLISTEN<\/code> \u7684\u529f\u80fd\u4ee5\u53ca\u5982\u4f55\u5728\u4f60\u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u4efb\u52d9\u4e2d\u4f7f\u7528\u5b83\u3002<\/p>\n<h2 id=\"understanding-unlisten-nDSZtXeEwO\">\u4e86\u89e3 UNLISTEN<\/h2>\n<p><code>UNLISTEN<\/code> \u662f PostgreSQL \u4e2d\u7684\u4e00\u500b\u6307\u4ee4\uff0c\u5141\u8a31\u5ba2\u6236\u7aef\u505c\u6b62\u63a5\u6536\u901a\u77e5\u3002\u901a\u77e5\u662f\u4e00\u7a2e\u8cc7\u6599\u5eab\u4f3a\u670d\u5668\u5411\u5ba2\u6236\u7aef\u544a\u77e5\u7279\u5b9a\u4e8b\u4ef6\u6216\u8b8a\u66f4\u7684\u65b9\u5f0f\u3002\u900f\u904e <code>LISTEN<\/code> \u6307\u4ee4\uff0c\u5ba2\u6236\u7aef\u53ef\u4ee5\u8a02\u95b1\u7279\u5b9a\u7684\u983b\u9053\uff0c\u7576\u8207\u9019\u4e9b\u983b\u9053\u76f8\u95dc\u7684\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u5ba2\u6236\u7aef\u5c07\u6703\u6536\u5230\u901a\u77e5\u3002<\/p>\n<p>\u7136\u800c\uff0c\u53ef\u80fd\u6703\u6709\u4e00\u4e9b\u60c5\u6cc1\uff0c\u5ba2\u6236\u7aef\u4e0d\u518d\u9700\u8981\u63a5\u6536\u901a\u77e5\u6216\u5e0c\u671b\u53d6\u6d88\u8a02\u95b1\u67d0\u500b\u983b\u9053\u3002\u6b64\u6642 <code>UNLISTEN<\/code> \u6307\u4ee4\u5c31\u6d3e\u4e0a\u7528\u5834\u4e86\uff0c\u5b83\u5141\u8a31\u5ba2\u6236\u7aef\u505c\u6b62\u63a5\u6536\u4f86\u81ea\u7279\u5b9a\u983b\u9053\u6216\u6240\u6709\u983b\u9053\u7684\u901a\u77e5\u3002<\/p>\n<h2 id=\"using-unlisten-nDSZtXeEwO\">\u5982\u4f55\u4f7f\u7528 UNLISTEN<\/h2>\n<p>\u4f7f\u7528 <code>UNLISTEN<\/code> \u7684\u8a9e\u6cd5\u975e\u5e38\u7c21\u55ae\uff1a<\/p>\n<pre><code>UNLISTEN channel_name;\r\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>channel_name<\/code> \u6307\u7684\u662f\u5ba2\u6236\u7aef\u60f3\u53d6\u6d88\u8a02\u95b1\u7684\u983b\u9053\u540d\u7a31\u3002\u5982\u679c\u5ba2\u6236\u7aef\u60f3\u505c\u6b62\u63a5\u6536\u6240\u6709\u983b\u9053\u7684\u901a\u77e5\uff0c\u53ef\u4ee5\u53ea\u4f7f\u7528 <code>UNLISTEN<\/code> \u6307\u4ee4\u800c\u4e0d\u6307\u5b9a\u983b\u9053\u540d\u7a31\u3002<\/p>\n<p>\u8b93\u6211\u5011\u901a\u904e\u4e00\u500b\u7bc4\u4f8b\u4f86\u66f4\u597d\u5730\u7406\u89e3 <code>UNLISTEN<\/code> \u7684\u904b\u4f5c\u65b9\u5f0f\uff1a<\/p>\n<pre><code>LISTEN my_channel;\r\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u5ba2\u6236\u7aef\u4f7f\u7528 <code>LISTEN<\/code> \u6307\u4ee4\u8a02\u95b1\u4e86\u4e00\u500b\u540d\u70ba <code>my_channel<\/code> \u7684\u983b\u9053\u3002\u73fe\u5728\uff0c\u7576 <code>my_channel<\/code> \u4e0a\u6709\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u5ba2\u6236\u7aef\u5c07\u6703\u6536\u5230\u901a\u77e5\u3002<\/p>\n<pre><code>UNLISTEN my_channel;\r\n<\/code><\/pre>\n<p>\u900f\u904e\u57f7\u884c\u5e36\u6709\u983b\u9053\u540d\u7a31\u7684 <code>UNLISTEN<\/code> \u6307\u4ee4\uff0c\u5ba2\u6236\u7aef\u53d6\u6d88\u4e86\u5c0d <code>my_channel<\/code> \u7684\u8a02\u95b1\u3002\u56e0\u6b64\uff0c\u672a\u4f86\u767c\u751f\u5728 <code>my_channel<\/code> \u4e0a\u7684\u4e8b\u4ef6\u5c07\u4e0d\u6703\u89f8\u767c\u8a72\u5ba2\u6236\u7aef\u7684\u901a\u77e5\u3002<\/p>\n<h2 id=\"benefits-of-unlisten-nDSZtXeEwO\">UNLISTEN \u7684\u512a\u9ede<\/h2>\n<p><code>UNLISTEN<\/code> \u6307\u4ee4\u5728 PostgreSQL \u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u63d0\u4f9b\u4e86\u591a\u9805\u512a\u9ede\uff1a<\/p>\n<h3 id=\"1-efficient-resource-utilization-nDSZtXeEwO\">1. \u6709\u6548\u5229\u7528\u8cc7\u6e90<\/h3>\n<p>\u900f\u904e\u4f7f\u7528 <code>UNLISTEN<\/code>\uff0c\u5ba2\u6236\u7aef\u53ef\u4ee5\u53d6\u6d88\u8a02\u95b1\u4e0d\u518d\u9700\u8981\u7684\u983b\u9053\u3002\u9019\u6709\u52a9\u65bc\u6709\u6548\u5229\u7528\u8cc7\u6e90\uff0c\u56e0\u70ba\u8cc7\u6599\u5eab\u4f3a\u670d\u5668\u4e0d\u5fc5\u5411\u4e0d\u5e0c\u671b\u63a5\u6536\u901a\u77e5\u7684\u5ba2\u6236\u7aef\u50b3\u9001\u901a\u77e5\u3002\u9019\u6e1b\u5c11\u4e86\u4e0d\u5fc5\u8981\u7684\u7db2\u7d61\u6d41\u91cf\u4e26\u63d0\u5347\u6574\u9ad4\u6548\u80fd\u3002<\/p>\n<h3 id=\"2-flexibility-in-notification-handling-nDSZtXeEwO\">2. \u901a\u77e5\u8655\u7406\u7684\u9748\u6d3b\u6027<\/h3>\n<p><code>UNLISTEN<\/code> \u63d0\u4f9b\u4e86\u8655\u7406\u901a\u77e5\u7684\u9748\u6d3b\u6027\u3002\u5ba2\u6236\u7aef\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u52d5\u614b\u5730\u8a02\u95b1\u6216\u53d6\u6d88\u8a02\u95b1\u983b\u9053\u3002\u9019\u4f7f\u5f97\u901a\u77e5\u7684\u63a5\u6536\u66f4\u52a0\u7cbe\u7d30\u5316\uff0c\u78ba\u4fdd\u5ba2\u6236\u7aef\u53ea\u63a5\u6536\u76f8\u95dc\u7684\u8cc7\u8a0a\u3002<\/p>\n<h3 id=\"3-scalability-nDSZtXeEwO\">3. \u53ef\u64f4\u5c55\u6027<\/h3>\n<p>\u900f\u904e\u80fd\u5920\u53d6\u6d88\u8a02\u95b1\u7279\u5b9a\u983b\u9053\uff0c<code>UNLISTEN<\/code> \u63d0\u5347\u4e86 PostgreSQL \u7684\u53ef\u64f4\u5c55\u6027\u3002\u96a8\u8457\u5ba2\u6236\u7aef\u548c\u983b\u9053\u6578\u91cf\u7684\u589e\u52a0\uff0c\u8a02\u95b1\u7ba1\u7406\u8b8a\u5f97\u66f4\u52a0\u5bb9\u6613\uff0c\u7cfb\u7d71\u4e5f\u80fd\u66f4\u6709\u6548\u5730\u8655\u7406\u66f4\u9ad8\u7684\u8ca0\u8f09\u3002<\/p>\n<h2 id=\"conclusion-nDSZtXeEwO\">\u7d50\u8ad6<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>UNLISTEN<\/code> \u6307\u4ee4\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5141\u8a31\u5ba2\u6236\u7aef\u53d6\u6d88\u8a02\u95b1\u7279\u5b9a\u983b\u9053\u6216\u6240\u6709\u983b\u9053\u3002\u5b83\u63d0\u4f9b\u4e86\u6709\u6548\u7684\u8cc7\u6e90\u5229\u7528\u3001\u901a\u77e5\u8655\u7406\u7684\u9748\u6d3b\u6027\u548c\u53ef\u64f4\u5c55\u6027\u3002\u900f\u904e\u904b\u7528 <code>UNLISTEN<\/code>\uff0c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u80fd\u5920\u512a\u5316\u5176 PostgreSQL \u8cc7\u6599\u5eab\u7684\u7ba1\u7406\u4efb\u52d9\u3002<\/p>\n<p>\u82e5\u60f3\u4e86\u89e3\u66f4\u591a\u6709\u95dc PostgreSQL \u53ca\u5176\u7279\u6027\uff0c\u5efa\u8b70\u700f\u89bd <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u8a72\u516c\u53f8\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u7684 VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aUN&#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-20648","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20648","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=20648"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20648\/revisions"}],"predecessor-version":[{"id":24364,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20648\/revisions\/24364"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}