{"id":20358,"date":"2024-01-02T04:51:19","date_gmt":"2024-01-02T04:51:19","guid":{"rendered":"https:\/\/server.hk\/blog\/20358\/"},"modified":"2024-11-14T10:39:50","modified_gmt":"2024-11-14T02:39:50","slug":"postgresql-command-drop-trigger","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20358\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aDROP TRIGGER"},"content":{"rendered":"<h1 id=\"postgresql-command-drop-trigger-LIXKyBEEYt\">PostgreSQL \u6307\u4ee4\uff1aDROP TRIGGER<\/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\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u7279\u6027\u3002<code>DROP TRIGGER<\/code> \u662f PostgreSQL \u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6307\u4ee4\uff0c\u7528\u65bc\u5f9e\u8cc7\u6599\u8868\u4e2d\u79fb\u9664\u89f8\u767c\u5668\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u63a2\u8a0e <code>DROP TRIGGER<\/code> \u6307\u4ee4\u53ca\u5176\u6709\u6548\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"understanding-triggers-in-postgresql-LIXKyBEEYt\">\u7406\u89e3 PostgreSQL \u4e2d\u7684\u89f8\u767c\u5668<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u89f8\u767c\u5668\u662f\u4e00\u7d44\u5728\u8cc7\u6599\u8868\u4e0a\u767c\u751f\u6307\u5b9a\u4e8b\u4ef6\u6642\u81ea\u52d5\u57f7\u884c\u7684\u64cd\u4f5c\u3002\u9019\u4e9b\u4e8b\u4ef6\u53ef\u4ee5\u5305\u62ec\u5c0d\u8868\u9032\u884c\u7684 <code>INSERT<\/code>\u3001<code>UPDATE<\/code> \u6216 <code>DELETE<\/code> \u64cd\u4f5c\u3002\u89f8\u767c\u5668\u5e38\u7528\u65bc\u5f37\u5236\u5be6\u73fe\u6578\u64da\u5b8c\u6574\u6027\u3001\u57f7\u884c\u8907\u96dc\u7684\u696d\u52d9\u898f\u5247\u6216\u57fa\u65bc\u7279\u5b9a\u689d\u4ef6\u57f7\u884c\u984d\u5916\u64cd\u4f5c\u3002<\/p>\n<p>\u89f8\u767c\u5668\u7531\u5169\u500b\u4e3b\u8981\u90e8\u5206\u7d44\u6210\uff1a\u89f8\u767c\u5668\u51fd\u6578\u548c\u89f8\u767c\u4e8b\u4ef6\u3002\u89f8\u767c\u5668\u51fd\u6578\u662f\u7531\u7528\u6236\u5b9a\u7fa9\u7684\u51fd\u6578\uff0c\u5305\u542b\u5728\u89f8\u767c\u4e8b\u4ef6\u767c\u751f\u6642\u8981\u57f7\u884c\u7684\u64cd\u4f5c\u3002\u89f8\u767c\u4e8b\u4ef6\u5247\u6307\u5b9a\u64cd\u4f5c\u7684\u985e\u578b\uff08<code>INSERT<\/code>\u3001<code>UPDATE<\/code> \u6216 <code>DELETE<\/code>\uff09\u4ee5\u53ca\u89f8\u767c\u5668\u61c9\u6fc0\u6d3b\u7684\u8cc7\u6599\u8868\u3002<\/p>\n<h2 id=\"the-drop-trigger-command-LIXKyBEEYt\">DROP TRIGGER \u6307\u4ee4<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>DROP TRIGGER<\/code> \u6307\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u8cc7\u6599\u8868\u4e2d\u79fb\u9664\u89f8\u767c\u5668\u3002\u8a72\u6307\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP TRIGGER [IF EXISTS] trigger_name ON table_name [CASCADE | RESTRICT];\r\n<\/code><\/pre>\n<p>\u8b93\u6211\u5011\u4f86\u5206\u89e3\u9019\u500b\u8a9e\u6cd5\uff1a<\/p>\n<ul>\n<li><code>IF EXISTS<\/code>\uff08\u53ef\u9078\uff09\uff1a\u6b64\u5b50\u53e5\u5141\u8a31\u5373\u4f7f\u89f8\u767c\u5668\u4e0d\u5b58\u5728\u6642\uff0c\u6307\u4ee4\u4e5f\u80fd\u6210\u529f\u57f7\u884c\uff0c\u9632\u6b62\u51fa\u73fe\u932f\u8aa4\u3002<\/li>\n<li><code>trigger_name<\/code>\uff1a\u6307\u5b9a\u8981\u522a\u9664\u7684\u89f8\u767c\u5668\u540d\u7a31\u3002<\/li>\n<li><code>table_name<\/code>\uff1a\u6307\u5b9a\u61c9\u5f9e\u4e2d\u79fb\u9664\u89f8\u767c\u5668\u7684\u8cc7\u6599\u8868\u540d\u7a31\u3002<\/li>\n<li><code>CASCADE | RESTRICT<\/code>\uff08\u53ef\u9078\uff09\uff1a\u6307\u5b9a\u7576\u89f8\u767c\u5668\u5b58\u5728\u4f9d\u8cf4\u95dc\u4fc2\u6642\u61c9\u63a1\u53d6\u7684\u884c\u52d5\u3002<code>CASCADE<\/code> \u6703\u79fb\u9664\u76f8\u95dc\u7684\u4f9d\u8cf4\u5c0d\u8c61\uff0c\u800c <code>RESTRICT<\/code> \u6703\u5728\u5b58\u5728\u4f9d\u8cf4\u6642\u5f15\u767c\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"examples-LIXKyBEEYt\">\u7bc4\u4f8b<\/h2>\n<p>\u8b93\u6211\u5011\u8003\u616e\u4e00\u500b\u5834\u666f\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba &#8220;employees&#8221; \u7684\u8868\uff0c\u4e26\u4e14\u6709\u4e00\u500b\u540d\u70ba &#8220;update_salary_trigger&#8221; \u7684\u89f8\u767c\u5668\uff0c\u6bcf\u7576\u54e1\u5de5\u7684\u8077\u7a31\u8b8a\u66f4\u6642\uff0c\u8a72\u89f8\u767c\u5668\u6703\u66f4\u65b0\u5176\u85aa\u8cc7\u3002\u8981\u79fb\u9664\u8a72\u89f8\u767c\u5668\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>DROP TRIGGER update_salary_trigger ON employees;\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u50c5\u5728\u89f8\u767c\u5668\u5b58\u5728\u6642\u624d\u522a\u9664\u5b83\uff0c\u6211\u5011\u53ef\u4ee5\u5c07\u6307\u4ee4\u4fee\u6539\u70ba\uff1a<\/p>\n<pre><code>DROP TRIGGER IF EXISTS update_salary_trigger ON employees;\r\n<\/code><\/pre>\n<p>\u5982\u679c\u89f8\u767c\u5668\u6709\u4f9d\u8cf4\u5c0d\u8c61\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>CASCADE<\/code> \u9078\u9805\u4f86\u4e00\u4f75\u79fb\u9664\u5b83\u5011\uff1a<\/p>\n<pre><code>DROP TRIGGER update_salary_trigger ON employees CASCADE;\r\n<\/code><\/pre>\n<h2 id=\"summary-LIXKyBEEYt\">\u6458\u8981<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>DROP TRIGGER<\/code> \u6307\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u8cc7\u6599\u8868\u4e2d\u79fb\u9664\u89f8\u767c\u5668\u3002\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6839\u64da\u7279\u5b9a\u4e8b\u4ef6\u81ea\u52d5\u57f7\u884c\u64cd\u4f5c\u3002\u901a\u904e\u4e86\u89e3\u5982\u4f55\u6709\u6548\u4f7f\u7528 <code>DROP TRIGGER<\/code> \u6307\u4ee4\uff0c\u7528\u6236\u53ef\u4ee5\u5728 PostgreSQL \u8cc7\u6599\u5eab\u4e2d\u9ad8\u6548\u7ba1\u7406\u89f8\u767c\u5668\u3002<\/p>\n<p>\u5982\u9700\u66f4\u591a\u6709\u95dc VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aDR&#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-20358","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20358","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=20358"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20358\/revisions"}],"predecessor-version":[{"id":24397,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20358\/revisions\/24397"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}