{"id":20764,"date":"2024-01-02T05:33:20","date_gmt":"2024-01-02T05:33:20","guid":{"rendered":"https:\/\/server.hk\/blog\/20764\/"},"modified":"2024-11-14T10:39:07","modified_gmt":"2024-11-14T02:39:07","slug":"postgresql-command-create-operator","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20764\/","title":{"rendered":"PostgreSQL \u547d\u4ee4: CREATE OPERATOR"},"content":{"rendered":"

PostgreSQL \u547d\u4ee4: CREATE OPERATOR<\/h1>\n

PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u591a\u7a2e\u529f\u80fd\u548c\u7279\u6027\u3002PostgreSQL \u7684\u4e00\u500b\u95dc\u9375\u7279\u6027\u662f\u80fd\u5920\u5275\u5efa\u81ea\u5b9a\u7fa9\u64cd\u4f5c\u7b26\uff0c\u5141\u8a31\u7528\u6236\u5728\u6578\u64da\u985e\u578b\u4e0a\u5b9a\u7fa9\u81ea\u5df1\u7684\u64cd\u4f5c\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e PostgreSQL \u7684 CREATE OPERATOR<\/code> \u547d\u4ee4\u53ca\u5176\u5982\u4f55\u7528\u4f86\u64f4\u5c55\u6578\u64da\u5eab\u7684\u529f\u80fd\u3002<\/p>\n

\u4ec0\u9ebc\u662f CREATE OPERATOR\uff1f<\/h2>\n

PostgreSQL \u4e2d\u7684 CREATE OPERATOR<\/code> \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u65b0\u7684\u64cd\u4f5c\u7b26\u6216\u4fee\u6539\u73fe\u6709\u7684\u64cd\u4f5c\u7b26\u3002\u64cd\u4f5c\u7b26\u662f\u7b26\u865f\u6216\u95dc\u9375\u5b57\uff0c\u7528\u4f86\u8868\u793a SQL \u8a9e\u53e5\u4e2d\u7684\u7279\u5b9a\u64cd\u4f5c\uff0c\u4f8b\u5982\u52a0\u6cd5\u3001\u6e1b\u6cd5\u6216\u6bd4\u8f03\u3002\u901a\u904e\u5275\u5efa\u81ea\u5b9a\u7fa9\u64cd\u4f5c\u7b26\uff0c\u7528\u6236\u53ef\u4ee5\u5728 PostgreSQL \u9ed8\u8a8d\u4e0d\u652f\u6301\u7684\u6578\u64da\u985e\u578b\u4e0a\u5b9a\u7fa9\u81ea\u5df1\u7684\u64cd\u4f5c\u3002<\/p>\n

\u8a9e\u6cd5<\/h2>\n

CREATE OPERATOR<\/code> \u547d\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE OPERATOR operator_name (\r\n    PROCEDURE = function_name,\r\n    LEFTARG = left_type,\r\n    RIGHTARG = right_type\r\n);\r\n<\/code><\/pre>\n
\u5176\u4e2d\uff0coperator_name<\/code> \u662f\u8981\u5275\u5efa\u7684\u64cd\u4f5c\u7b26\u540d\u7a31\uff0cfunction_name<\/code> \u662f\u5be6\u73fe\u8a72\u64cd\u4f5c\u7b26\u7684\u51fd\u6578\u540d\u7a31\uff0cleft_type<\/code> \u548c right_type<\/code> \u5206\u5225\u662f\u5de6\u64cd\u4f5c\u6578\u548c\u53f3\u64cd\u4f5c\u6578\u7684\u6578\u64da\u985e\u578b\u3002<\/p>\n
\u7bc4\u4f8b<\/h2>\n
\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5275\u5efa\u4e00\u500b\u540d\u70ba +<\/code> \u7684\u81ea\u5b9a\u7fa9\u64cd\u4f5c\u7b26\uff0c\u7528\u4f86\u9023\u63a5\u5169\u500b\u5b57\u4e32\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 CREATE OPERATOR<\/code> \u547d\u4ee4\u4f86\u5be6\u73fe\u9019\u4e00\u9ede\uff1a<\/p>\n
CREATE OPERATOR + (\r\n    PROCEDURE = concat_strings,\r\n    LEFTARG = text,\r\n    RIGHTARG = text\r\n);\r\n<\/code><\/pre>\n
\u5728\u6b64\u7bc4\u4f8b\u4e2d\uff0cconcat_strings<\/code> \u662f\u4e00\u500b\u7528\u6236\u5b9a\u7fa9\u7684\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u9023\u63a5\u5169\u500b\u5b57\u4e32\u3002LEFTARG<\/code> \u548c RIGHTARG<\/code> \u53c3\u6578\u6307\u5b9a\u8a72\u64cd\u4f5c\u7b26\u53ea\u80fd\u7528\u65bc text<\/code> \u6578\u64da\u985e\u578b\u7684\u64cd\u4f5c\u6578\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
PostgreSQL \u4e2d\u7684 CREATE OPERATOR<\/code> \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u5b9a\u7fa9\u64cd\u4f5c\u7b26\uff0c\u5f9e\u800c\u64f4\u5c55\u6578\u64da\u5eab\u7684\u529f\u80fd\u3002\u901a\u904e\u5275\u5efa\u64cd\u4f5c\u7b26\uff0c\u7528\u6236\u53ef\u4ee5\u5c0d PostgreSQL \u9ed8\u8a8d\u4e0d\u652f\u6301\u7684\u6578\u64da\u985e\u578b\u9032\u884c\u64cd\u4f5c\u3002\u9019\u7a2e\u9748\u6d3b\u6027\u4f7f PostgreSQL \u6210\u70ba\u5404\u7a2e\u61c9\u7528\u548c\u4f7f\u7528\u6848\u4f8b\u4e2d\u7684\u591a\u529f\u80fd\u9078\u64c7\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7e3d\u4e4b\uff0cPostgreSQL \u4e2d\u7684 CREATE OPERATOR<\/code> \u547d\u4ee4\u8b93\u7528\u6236\u53ef\u4ee5\u70ba\u9ed8\u8a8d\u4e0d\u652f\u6301\u7684\u6578\u64da\u985e\u578b\u5b9a\u7fa9\u81ea\u5b9a\u7fa9\u64cd\u4f5c\u7b26\u3002\u901a\u904e\u5275\u5efa\u64cd\u4f5c\u7b26\uff0c\u7528\u6236\u53ef\u4ee5\u64f4\u5c55\u6578\u64da\u5eab\u7684\u529f\u80fd\uff0c\u4e26\u6839\u64da\u5176\u7279\u5b9a\u9700\u6c42\u9032\u884c\u8abf\u6574\u3002\u6b32\u4e86\u89e3\u66f4\u591a\u6709\u95dc VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
PostgreSQL \u547d\u4ee4: C...<\/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-20764","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20764","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=20764"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20764\/revisions"}],"predecessor-version":[{"id":24348,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20764\/revisions\/24348"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}