{"id":20773,"date":"2024-01-02T05:42:19","date_gmt":"2024-01-02T05:42:19","guid":{"rendered":"https:\/\/server.hk\/blog\/20773\/"},"modified":"2024-11-14T10:38:57","modified_gmt":"2024-11-14T02:38:57","slug":"postgresql-command-drop-transform","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20773\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aDROP TRANSFORM"},"content":{"rendered":"<h1 id=\"postgresql-command-drop-transform-cWZIKanPvj\">PostgreSQL \u6307\u4ee4\uff1aDROP TRANSFORM<\/h1>\n<p>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\u91cd\u8981\u7684\u6307\u4ee4\u662f DROP TRANSFORM \u6307\u4ee4\uff0c\u8a72\u6307\u4ee4\u5141\u8a31\u7528\u6236\u522a\u9664\u5148\u524d\u5b9a\u7fa9\u7684\u8f49\u63db\u51fd\u6578\u3002<\/p>\n<h2 id=\"understanding-transforms-in-postgresql-cWZIKanPvj\">\u7406\u89e3 PostgreSQL \u4e2d\u7684\u8f49\u63db<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u8f49\u63db\u7528\u65bc\u5c07\u6578\u64da\u5f9e\u4e00\u7a2e\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u985e\u578b\u3002\u5b83\u5011\u4e3b\u8981\u7528\u65bc\u5168\u6587\u641c\u7d22\u5834\u666f\uff0c\u5728\u9019\u4e9b\u5834\u666f\u4e2d\uff0c\u8cc7\u6599\u5eab\u9700\u8981\u5c07\u8f38\u5165\u6578\u64da\u8f49\u63db\u70ba\u9069\u5408\u641c\u7d22\u548c\u7d22\u5f15\u7684\u683c\u5f0f\u3002<\/p>\n<p>\u8f49\u63db\u662f\u901a\u904e CREATE TRANSFORM \u6307\u4ee4\u5b9a\u7fa9\u7684\uff0c\u8a72\u6307\u4ee4\u6307\u5b9a\u4e86\u8f38\u5165\u548c\u8f38\u51fa\u985e\u578b\uff0c\u4ee5\u53ca\u8f49\u63db\u51fd\u6578\u3002\u4e00\u65e6\u5b9a\u7fa9\u4e86\u8f49\u63db\uff0c\u5b83\u53ef\u4ee5\u7528\u65bc\u5404\u7a2e\u5168\u6587\u641c\u7d22\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"the-drop-transform-command-cWZIKanPvj\">DROP TRANSFORM \u6307\u4ee4<\/h2>\n<p>DROP TRANSFORM \u6307\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u8cc7\u6599\u5eab\u4e2d\u522a\u9664\u5148\u524d\u5b9a\u7fa9\u7684\u8f49\u63db\u3002\u8a72\u6307\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP TRANSFORM [ IF EXISTS ] transform_name (type_name, type_name);\r\n<\/code><\/pre>\n<p><code>transform_name<\/code> \u53c3\u6578\u6307\u5b9a\u8981\u522a\u9664\u7684\u8f49\u63db\u540d\u7a31\uff0c\u800c <code>type_name<\/code> \u53c3\u6578\u6307\u5b9a\u8f49\u63db\u7684\u8f38\u5165\u548c\u8f38\u51fa\u985e\u578b\u3002<\/p>\n<p>\u9ed8\u8a8d\u60c5\u6cc1\u4e0b\uff0c\u5982\u679c\u8f49\u63db\u4e0d\u5b58\u5728\uff0cDROP TRANSFORM \u6307\u4ee4\u5c07\u5c0e\u81f4\u932f\u8aa4\u3002\u7136\u800c\uff0c\u901a\u904e\u4f7f\u7528 <code>IF EXISTS<\/code> \u9078\u9805\uff0c\u5373\u4f7f\u8f49\u63db\u4e0d\u5b58\u5728\uff0c\u8a72\u6307\u4ee4\u4e5f\u6703\u6210\u529f\u57f7\u884c\u3002<\/p>\n<h2 id=\"examples-cWZIKanPvj\">\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>my_transform<\/code> \u7684\u8f49\u63db\uff0c\u5b83\u5c07\u6578\u64da\u5f9e <code>text<\/code> \u985e\u578b\u8f49\u63db\u70ba <code>integer<\/code> \u985e\u578b\u3002\u8981\u522a\u9664\u6b64\u8f49\u63db\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>DROP TRANSFORM my_transform (text, integer);\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u5011\u53ea\u60f3\u5728\u8f49\u63db\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u522a\u9664\u5b83\uff0c\u53ef\u4ee5\u5c07\u6307\u4ee4\u4fee\u6539\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP TRANSFORM IF EXISTS my_transform (text, integer);\r\n<\/code><\/pre>\n<h2 id=\"summary-cWZIKanPvj\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u4e2d\u7684 DROP TRANSFORM \u6307\u4ee4\u5141\u8a31\u7528\u6236\u522a\u9664\u5148\u524d\u5b9a\u7fa9\u7684\u8f49\u63db\u3002\u8f49\u63db\u7528\u65bc\u5c07\u6578\u64da\u5f9e\u4e00\u7a2e\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u985e\u578b\uff0c\u4e3b\u8981\u7528\u65bc\u5168\u6587\u641c\u7d22\u5834\u666f\u3002\u901a\u904e\u6709\u6548\u7406\u89e3\u548c\u5229\u7528 DROP TRANSFORM \u6307\u4ee4\uff0c\u7528\u6236\u53ef\u4ee5\u5728 PostgreSQL \u4e2d\u9ad8\u6548\u7ba1\u7406\u5176\u8f49\u63db\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u6709\u95dc VPS \u4e3b\u6a5f\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u4e26\u63a2\u7d22\u6211\u5011\u4e00\u6d41\u7684 VPS \u89e3\u6c7a\u65b9\u6848\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-20773","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20773","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=20773"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20773\/revisions"}],"predecessor-version":[{"id":24332,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20773\/revisions\/24332"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}