{"id":179000,"date":"2024-11-08T22:10:23","date_gmt":"2024-11-08T14:10:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179000\/"},"modified":"2024-11-08T22:10:23","modified_gmt":"2024-11-08T14:10:23","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42723-duplicate_function%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179000\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42723 – duplicate_function\uff1f"},"content":{"rendered":"

\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42723 – duplicate_function<\/h1>\n

\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u662f\u932f\u8aa4\u4ee3\u78bc 42723\uff0c\u8868\u793a\u300cduplicate_function\u300d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u5275\u5efa\u4e00\u500b\u5df2\u7d93\u5b58\u5728\u7684\u51fd\u6578\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u4fee\u5fa9\u554f\u984c\u3002<\/p>\n

\u932f\u8aa4\u539f\u56e0<\/h2>\n

PostgreSQL \u4e2d\u7684\u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u7279\u5b9a\u4efb\u52d9\u7684\u4ee3\u78bc\u584a\u3002\u7576\u4f60\u5617\u8a66\u5275\u5efa\u4e00\u500b\u51fd\u6578\u6642\uff0c\u5982\u679c\u8a72\u51fd\u6578\u7684\u540d\u7a31\u548c\u53c3\u6578\u985e\u578b\u8207\u5df2\u5b58\u5728\u7684\u51fd\u6578\u76f8\u540c\uff0c\u5247\u6703\u5f15\u767c\u932f\u8aa4 42723\u3002\u9019\u610f\u5473\u8457 PostgreSQL \u7121\u6cd5\u5340\u5206\u9019\u5169\u500b\u51fd\u6578\uff0c\u56e0\u70ba\u5b83\u5011\u7684\u7c3d\u540d\uff08\u540d\u7a31\u548c\u53c3\u6578\u985e\u578b\uff09\u662f\u76f8\u540c\u7684\u3002<\/p>\n

\u793a\u4f8b<\/h3>\n
CREATE FUNCTION calculate_area(radius FLOAT) RETURNS FLOAT AS $$\nBEGIN\n    RETURN PI() * radius * radius;\nEND;\n$$ LANGUAGE plpgsql;\n\n-- \u5617\u8a66\u518d\u6b21\u5275\u5efa\u76f8\u540c\u540d\u7a31\u7684\u51fd\u6578\nCREATE FUNCTION calculate_area(radius FLOAT) RETURNS FLOAT AS $$\nBEGIN\n    RETURN 2 * PI() * radius;\nEND;\n$$ LANGUAGE plpgsql;\n<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u7b2c\u4e8c\u6b21\u5275\u5efa\u540d\u70ba calculate_area<\/code> \u7684\u51fd\u6578\u6642\uff0c\u5c07\u6703\u5f15\u767c\u932f\u8aa4 42723\uff0c\u56e0\u70ba\u7b2c\u4e00\u500b\u51fd\u6578\u5df2\u7d93\u5b58\u5728\u3002<\/p>\n
\u89e3\u6c7a\u65b9\u6848<\/h2>\n
\u8981\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n
1. \u6aa2\u67e5\u51fd\u6578\u662f\u5426\u5df2\u5b58\u5728<\/h3>\n
\u5728\u5275\u5efa\u51fd\u6578\u4e4b\u524d\uff0c\u9996\u5148\u6aa2\u67e5\u8a72\u51fd\u6578\u662f\u5426\u5df2\u7d93\u5b58\u5728\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\uff1a<\/p>\n
SELECT * FROM pg_proc WHERE proname = 'calculate_area';\n<\/code><\/pre>\n
\u5982\u679c\u67e5\u8a62\u7d50\u679c\u986f\u793a\u8a72\u51fd\u6578\u5df2\u5b58\u5728\uff0c\u5247\u53ef\u4ee5\u9078\u64c7\u522a\u9664\u6216\u4fee\u6539\u5b83\u3002<\/p>\n
2. \u522a\u9664\u5df2\u5b58\u5728\u7684\u51fd\u6578<\/h3>\n
\u5982\u679c\u78ba\u5b9a\u4e0d\u518d\u9700\u8981\u5df2\u5b58\u5728\u7684\u51fd\u6578\uff0c\u53ef\u4ee5\u4f7f\u7528 DROP FUNCTION<\/code> \u8a9e\u53e5\u522a\u9664\u5b83\uff1a<\/p>\n
DROP FUNCTION calculate_area(FLOAT);\n<\/code><\/pre>\n
\u522a\u9664\u5f8c\uff0c\u60a8\u53ef\u4ee5\u91cd\u65b0\u5275\u5efa\u51fd\u6578\u3002<\/p>\n
3. \u4f7f\u7528\u4e0d\u540c\u7684\u51fd\u6578\u540d\u7a31<\/h3>\n
\u5982\u679c\u60a8\u5e0c\u671b\u4fdd\u7559\u5df2\u5b58\u5728\u7684\u51fd\u6578\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u4e0d\u540c\u7684\u540d\u7a31\u4f86\u5275\u5efa\u65b0\u51fd\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE FUNCTION calculate_area_v2(radius FLOAT) RETURNS FLOAT AS $$\nBEGIN\n    RETURN 2 * PI() * radius;\nEND;\n$$ LANGUAGE plpgsql;\n<\/code><\/pre>\n
4. \u4f7f\u7528\u4e0d\u540c\u7684\u53c3\u6578\u985e\u578b<\/h3>\n
\u53e6\u4e00\u7a2e\u89e3\u6c7a\u65b9\u6848\u662f\u66f4\u6539\u51fd\u6578\u7684\u53c3\u6578\u985e\u578b\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u540d\u7a31\u885d\u7a81\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE FUNCTION calculate_area(radius INT) RETURNS FLOAT AS $$\nBEGIN\n    RETURN PI() * radius * radius;\nEND;\n$$ LANGUAGE plpgsql;\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42723 – duplicate_function \u901a\u5e38\u662f\u7531\u65bc\u51fd\u6578\u540d\u7a31\u885d\u7a81\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u51fd\u6578\u662f\u5426\u5df2\u5b58\u5728\u3001\u522a\u9664\u4e0d\u9700\u8981\u7684\u51fd\u6578\u3001\u4f7f\u7528\u4e0d\u540c\u7684\u51fd\u6578\u540d\u7a31\u6216\u53c3\u6578\u985e\u578b\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u500b\u554f\u984c\u3002\u4e86\u89e3\u5982\u4f55\u8655\u7406\u9019\u4e9b\u932f\u8aa4\u4e0d\u50c5\u80fd\u63d0\u9ad8\u958b\u767c\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u60a8\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\u66f4\u52a0\u5f97\u5fc3\u61c9\u624b\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u90e8\u7f72\uff0c\u6211\u5011\u7684 \u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42723 – duplicate_function\uff0c\u89e3\u6c7a\u91cd\u8907\u51fd\u6578\u5b9a\u7fa9\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u6b63\u5e38\u904b\u884c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-179000","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179000","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=179000"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179000\/revisions"}],"predecessor-version":[{"id":179001,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179000\/revisions\/179001"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}