{"id":179026,"date":"2024-11-08T22:23:18","date_gmt":"2024-11-08T14:23:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179026\/"},"modified":"2024-11-08T22:23:19","modified_gmt":"2024-11-08T14:23:19","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%9a42p04-duplicate_database%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179026\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P04 &#8211; duplicate_database\uff1f"},"content":{"rendered":"<h1 id=\"%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%9a42p04-duplicate_database-VSWgMzPECL\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P04 &#8211; duplicate_database<\/h1>\n<p>\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\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc <code>42P04<\/code>\uff0c\u9019\u8868\u793a\u300cduplicate_database\u300d\uff0c\u5373\u5617\u8a66\u5275\u5efa\u4e00\u500b\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c <code>CREATE DATABASE<\/code> \u547d\u4ee4\u6642\uff0c\u7576\u6307\u5b9a\u7684\u6578\u64da\u5eab\u540d\u7a31\u5df2\u7d93\u5b58\u5728\u65bc PostgreSQL \u4f3a\u670d\u5668\u4e2d\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0-VSWgMzPECL\">\u932f\u8aa4\u539f\u56e0<\/h2>\n<p>\u7576\u4f60\u5617\u8a66\u5275\u5efa\u4e00\u500b\u6578\u64da\u5eab\u6642\uff0cPostgreSQL \u6703\u6aa2\u67e5\u8a72\u6578\u64da\u5eab\u540d\u7a31\u662f\u5426\u5df2\u7d93\u5b58\u5728\u3002\u5982\u679c\u5b58\u5728\uff0c\u5247\u6703\u8fd4\u56de <code>42P04<\/code> \u932f\u8aa4\u3002\u9019\u901a\u5e38\u662f\u56e0\u70ba\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u5eab\u540d\u7a31\u62fc\u5beb\u932f\u8aa4\uff0c\u5c0e\u81f4\u8aa4\u4ee5\u70ba\u6578\u64da\u5eab\u4e0d\u5b58\u5728\u3002<\/li>\n<li>\u5728\u4e0d\u540c\u7684\u9023\u63a5\u4e2d\uff0c\u6578\u64da\u5eab\u5df2\u7d93\u88ab\u5275\u5efa\u3002<\/li>\n<li>\u5728\u57f7\u884c\u8173\u672c\u6642\uff0c\u91cd\u8907\u57f7\u884c\u4e86\u5275\u5efa\u6578\u64da\u5eab\u7684\u547d\u4ee4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e6%ad%a4%e9%8c%af%e8%aa%a4-VSWgMzPECL\">\u5982\u4f55\u4fee\u5fa9\u6b64\u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9 <code>42P04<\/code> \u932f\u8aa4\u7684\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e5%ba%ab%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8-VSWgMzPECL\">1. \u6aa2\u67e5\u6578\u64da\u5eab\u662f\u5426\u5b58\u5728<\/h3>\n<p>\u9996\u5148\uff0c\u4f60\u9700\u8981\u78ba\u8a8d\u6578\u64da\u5eab\u662f\u5426\u5df2\u7d93\u5b58\u5728\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u6aa2\u67e5\uff1a<\/p>\n<pre><code>SELECT datname FROM pg_database;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u6703\u5217\u51fa\u6240\u6709\u5b58\u5728\u7684\u6578\u64da\u5eab\u540d\u7a31\u3002\u5982\u679c\u4f60\u767c\u73fe\u4f60\u8981\u5275\u5efa\u7684\u6578\u64da\u5eab\u540d\u7a31\u5df2\u7d93\u5728\u5217\u8868\u4e2d\uff0c\u5247\u9700\u8981\u9078\u64c7\u5176\u4ed6\u540d\u7a31\u6216\u522a\u9664\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\u3002<\/p>\n<h3 id=\"2-%e5%88%aa%e9%99%a4%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%88%e5%a6%82%e6%9e%9c%e9%9c%80%e8%a6%81%ef%bc%89-VSWgMzPECL\">2. \u522a\u9664\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\uff08\u5982\u679c\u9700\u8981\uff09<\/h3>\n<p>\u5982\u679c\u4f60\u78ba\u5b9a\u8981\u522a\u9664\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>DROP DATABASE database_name;<\/code><\/pre>\n<p>\u8acb\u5c07 <code>database_name<\/code> \u66ff\u63db\u70ba\u4f60\u8981\u522a\u9664\u7684\u6578\u64da\u5eab\u540d\u7a31\u3002\u6ce8\u610f\uff0c\u522a\u9664\u6578\u64da\u5eab\u6703\u6c38\u4e45\u4e1f\u5931\u8a72\u6578\u64da\u5eab\u4e2d\u7684\u6240\u6709\u6578\u64da\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u6b64\u64cd\u4f5c\u4e4b\u524d\uff0c\u8acb\u52d9\u5fc5\u5099\u4efd\u91cd\u8981\u6578\u64da\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e4%b8%8d%e5%90%8c%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e5%90%8d%e7%a8%b1-VSWgMzPECL\">3. \u4f7f\u7528\u4e0d\u540c\u7684\u6578\u64da\u5eab\u540d\u7a31<\/h3>\n<p>\u5982\u679c\u4e0d\u60f3\u522a\u9664\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\uff0c\u5247\u53ef\u4ee5\u9078\u64c7\u4f7f\u7528\u4e0d\u540c\u7684\u540d\u7a31\u4f86\u5275\u5efa\u65b0\u7684\u6578\u64da\u5eab\u3002\u78ba\u4fdd\u65b0\u540d\u7a31\u5728\u7576\u524d PostgreSQL \u4f3a\u670d\u5668\u4e2d\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5%e8%85%b3%e6%9c%ac%e6%88%96%e6%87%89%e7%94%a8%e7%a8%8b%e5%bc%8f%e9%82%8f%e8%bc%af-VSWgMzPECL\">4. \u6aa2\u67e5\u8173\u672c\u6216\u61c9\u7528\u7a0b\u5f0f\u908f\u8f2f<\/h3>\n<p>\u5982\u679c\u4f60\u5728\u57f7\u884c\u8173\u672c\u6642\u9047\u5230\u6b64\u932f\u8aa4\uff0c\u8acb\u6aa2\u67e5\u8173\u672c\u7684\u908f\u8f2f\uff0c\u78ba\u4fdd\u4e0d\u6703\u91cd\u8907\u57f7\u884c\u5275\u5efa\u6578\u64da\u5eab\u7684\u547d\u4ee4\u3002\u53ef\u4ee5\u8003\u616e\u5728\u5275\u5efa\u6578\u64da\u5eab\u4e4b\u524d\u6dfb\u52a0\u6aa2\u67e5\u908f\u8f2f\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>DO $$ \nBEGIN \n    IF NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = 'database_name') THEN \n        CREATE DATABASE database_name; \n    END IF; \nEND $$;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VSWgMzPECL\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc <code>42P04<\/code> \u901a\u5e38\u662f\u7531\u65bc\u5617\u8a66\u5275\u5efa\u4e00\u500b\u5df2\u5b58\u5728\u7684\u6578\u64da\u5eab\u800c\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u6578\u64da\u5eab\u662f\u5426\u5b58\u5728\u3001\u522a\u9664\u4e0d\u9700\u8981\u7684\u6578\u64da\u5eab\u3001\u4f7f\u7528\u4e0d\u540c\u7684\u540d\u7a31\u6216\u8abf\u6574\u8173\u672c\u908f\u8f2f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u6578\u64da\u5eab\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u652f\u6301\u548c\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u9806\u5229\u9032\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42P04\uff08duplicate_database\uff09\uff0c\u89e3\u6c7a\u91cd\u8907\u6578\u64da\u5eab\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-179026","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179026","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=179026"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179026\/revisions"}],"predecessor-version":[{"id":179027,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179026\/revisions\/179027"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}