{"id":20364,"date":"2024-01-02T04:57:22","date_gmt":"2024-01-02T04:57:22","guid":{"rendered":"https:\/\/server.hk\/blog\/20364\/"},"modified":"2024-11-14T10:39:45","modified_gmt":"2024-11-14T02:39:45","slug":"postgresql-command-create-type","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20364\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aCREATE TYPE"},"content":{"rendered":"

PostgreSQL \u6307\u4ee4\uff1aCREATE TYPE<\/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\u95dc\u9375\u7684\u6307\u4ee4\u662f CREATE TYPE \u6307\u4ee4\uff0c\u8a72\u6307\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u8a02\u7684\u8cc7\u6599\u985e\u578b\u3002\u672c\u6587\u5c07\u8a73\u7d30\u63a2\u8a0e CREATE TYPE \u6307\u4ee4\uff0c\u5305\u62ec\u5176\u8a9e\u6cd5\u3001\u7528\u6cd5\u548c\u793a\u4f8b\u3002<\/p>\n

\u8a9e\u6cd5<\/h2>\n

PostgreSQL \u4e2d CREATE TYPE \u6307\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE TYPE type_name AS (attribute_name data_type, ...);\r\n<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0ctype_name<\/code> \u662f\u6240\u5275\u5efa\u7684\u81ea\u8a02\u8cc7\u6599\u985e\u578b\u7684\u540d\u7a31\uff0c\u800c attribute_name<\/code> \u662f\u8cc7\u6599\u985e\u578b\u5167\u7684\u5c6c\u6027\u540d\u7a31\u3002data_type<\/code> \u6307\u5b9a\u4e86\u5c6c\u6027\u7684\u8cc7\u6599\u985e\u578b\u3002<\/p>\n
\u7528\u6cd5<\/h2>\n
CREATE TYPE \u6307\u4ee4\u4e3b\u8981\u7528\u65bc\u5728 PostgreSQL \u4e2d\u5275\u5efa\u8907\u5408\u985e\u578b\u3002\u8907\u5408\u985e\u578b\u662f\u4e00\u7a2e\u7528\u6236\u5b9a\u7fa9\u7684\u8cc7\u6599\u985e\u578b\uff0c\u53ef\u4ee5\u5305\u542b\u591a\u500b\u5c6c\u6027\u3002\u9019\u4e9b\u5c6c\u6027\u53ef\u4ee5\u662f\u4efb\u4f55\u5167\u5efa\u6216\u7528\u6236\u5b9a\u7fa9\u7684\u8cc7\u6599\u985e\u578b\u3002<\/p>\n
\u901a\u904e\u5275\u5efa\u81ea\u8a02\u7684\u8907\u5408\u985e\u578b\uff0c\u7528\u6236\u53ef\u4ee5\u5b9a\u7fa9\u7d50\u69cb\u5316\u7684\u8cc7\u6599\uff0c\u9019\u4e9b\u8cc7\u6599\u53ef\u4ee5\u7528\u65bc\u8868\u683c\u3001\u51fd\u6578\u548c\u5176\u4ed6\u8cc7\u6599\u5eab\u5c0d\u8c61\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u8cc7\u6599\u5b58\u5132\u548c\u6aa2\u7d22\u4e2d\u63d0\u4f9b\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u7d44\u7e54\u6027\u3002<\/p>\n
\u793a\u4f8b<\/h2>\n
\u8b93\u6211\u5011\u770b\u5e7e\u500b\u793a\u4f8b\uff0c\u4ee5\u66f4\u597d\u5730\u7406\u89e3 CREATE TYPE \u6307\u4ee4\u7684\u7528\u6cd5\u3002<\/p>\n
\u793a\u4f8b 1\uff1a\u5275\u5efa\u7c21\u55ae\u7684\u8907\u5408\u985e\u578b<\/h3>\n
\u5047\u8a2d\u6211\u5011\u60f3\u5275\u5efa\u4e00\u500b\u540d\u70ba person<\/code> \u7684\u8907\u5408\u985e\u578b\uff0c\u5177\u6709 name<\/code> \u548c age<\/code> \u5c6c\u6027\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n
CREATE TYPE person AS (name text, age integer);\r\n<\/code><\/pre>\n
\u9019\u689d\u6307\u4ee4\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba person<\/code> \u7684\u65b0\u8907\u5408\u985e\u578b\uff0c\u5177\u6709\u5169\u500b\u5c6c\u6027\uff1aname<\/code> \u7684\u985e\u578b\u70ba text<\/code>\uff0cage<\/code> \u7684\u985e\u578b\u70ba integer<\/code>\u3002<\/p>\n
\u793a\u4f8b 2\uff1a\u5728\u8868\u4e2d\u4f7f\u7528\u8907\u5408\u985e\u578b<\/h3>\n
\u4e00\u65e6\u6211\u5011\u5275\u5efa\u4e86\u8907\u5408\u985e\u578b\uff0c\u5c31\u53ef\u4ee5\u5728\u8868\u4e2d\u4f7f\u7528\u5b83\u3002\u4f8b\u5982\uff0c\u8b93\u6211\u5011\u5275\u5efa\u4e00\u500b\u540d\u70ba employees<\/code> \u7684\u8868\uff0c\u4e26\u5305\u542b\u4e00\u500b\u985e\u578b\u70ba person<\/code> \u7684\u5217\uff1a<\/p>\n
CREATE TABLE employees (\r\n    id serial PRIMARY KEY,\r\n    employee_info person\r\n);\r\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0cemployee_info<\/code> \u5217\u7684\u985e\u578b\u70ba person<\/code>\uff0c\u9019\u662f\u6211\u5011\u7684\u81ea\u8a02\u8907\u5408\u985e\u578b\u3002\u6211\u5011\u73fe\u5728\u53ef\u4ee5\u4f7f\u7528 person<\/code> \u985e\u578b\u5411\u9019\u500b\u8868\u4e2d\u63d2\u5165\u8cc7\u6599\u3002<\/p>\n
\u793a\u4f8b 3\uff1a\u4fee\u6539\u8907\u5408\u985e\u578b<\/h3>\n
\u5982\u679c\u6211\u5011\u9700\u8981\u4fee\u6539\u8907\u5408\u985e\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528 ALTER TYPE \u6307\u4ee4\u3002\u4f8b\u5982\uff0c\u8b93\u6211\u5011\u5411 person<\/code> \u985e\u578b\u6dfb\u52a0\u4e00\u500b\u540d\u70ba email<\/code> \u7684\u65b0\u5c6c\u6027\uff1a<\/p>\n
ALTER TYPE person ADD ATTRIBUTE email text;\r\n<\/code><\/pre>\n
\u9019\u689d\u6307\u4ee4\u5c07\u4e00\u500b\u540d\u70ba email<\/code> \u7684\u65b0\u5c6c\u6027\uff08\u985e\u578b\u70ba text<\/code>\uff09\u6dfb\u52a0\u5230\u73fe\u6709\u7684 person<\/code> \u985e\u578b\u4e2d\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
PostgreSQL \u4e2d\u7684 CREATE TYPE \u6307\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u8a02\u7684\u8907\u5408\u985e\u578b\u3002\u9019\u4e9b\u985e\u578b\u53ef\u4ee5\u5305\u542b\u591a\u500b\u5c6c\u6027\uff0c\u9019\u4e9b\u5c6c\u6027\u53ef\u4ee5\u662f\u4efb\u4f55\u5167\u5efa\u6216\u7528\u6236\u5b9a\u7fa9\u7684\u8cc7\u6599\u985e\u578b\u3002\u901a\u904e\u4f7f\u7528 CREATE TYPE \u6307\u4ee4\uff0c\u7528\u6236\u53ef\u4ee5\u5275\u5efa\u53ef\u7528\u65bc\u8868\u683c\u3001\u51fd\u6578\u548c\u5176\u4ed6\u8cc7\u6599\u5eab\u5c0d\u8c61\u7684\u7d50\u69cb\u5316\u8cc7\u6599\u3002<\/p>\n
\u5982\u679c\u60a8\u6709\u8208\u8da3\u4e86\u89e3\u66f4\u591a\u6709\u95dc PostgreSQL \u53ca\u5176\u529f\u80fd\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u8003\u616e\u63a2\u7d22 Server.HK<\/a>\uff0c\u9019\u662f\u4e00\u5bb6\u9818\u5148\u7684 VPS \u4e3b\u6a5f\u516c\u53f8\uff0c\u63d0\u4f9b\u53ef\u9760\u7684\u9ad8\u6548\u80fd\u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
PostgreSQL \u6307\u4ee4\uff1aCR...<\/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-20364","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20364","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=20364"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20364\/revisions"}],"predecessor-version":[{"id":24391,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20364\/revisions\/24391"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}