{"id":204995,"date":"2025-05-29T16:44:30","date_gmt":"2025-05-29T08:44:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204995\/"},"modified":"2025-05-29T16:44:30","modified_gmt":"2025-05-29T08:44:30","slug":"postgresql-%e4%b8%ad%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86-python-%e7%a9%ba%e5%80%bc%e6%8f%92%e5%85%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204995\/","title":{"rendered":"PostgreSQL \u4e2d\u5982\u4f55\u5904\u7406 Python \u7a7a\u503c\u63d2\u5165\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

PostgreSQL \u4e2d\u5982\u4f55\u5904\u7406 Python \u7a7a\u503c\u63d2\u5165\uff1f<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span><\/span>\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n

<\/p>\n

postgresql \u4e2d python \u7a7a\u503c\u63d2\u5165<\/strong><\/p>\n

\u5728\u5411 postgresql \u6570\u636e\u5e93\u63d2\u5165\u6570\u636e\u65f6\uff0c\u9047\u5230\u4e86\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n

1. \u5904\u7406\u7a7a\u5b57\u7b26\u4e32<\/strong><\/p>\n

\u95ee\u9898\uff1a\u5982\u4f55\u5c06\u7a7a\u5b57\u7b26\u4e32\uff08””\uff09\u66ff\u6362\u4e3a sql \u4e2d\u7684 null\uff1f<\/p>\n

\u89e3\u7b54\uff1a\u5728\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5c06\u7a7a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a none\uff1a<\/p>\n

>>> cursor.execute(\"insert into student (name, age) values (none, 15)\")<\/pre>\n
2. \u5904\u7406 numpy nan\u3001none<\/strong><\/p>\n
\u95ee\u9898\uff1a\u5982\u4f55\u5c06 dataframe \u4e2d\u7684 numpy nan \u548c none \u503c\u63d2\u5165\u4e3a null\uff1f<\/p>\n
\u89e3\u7b54\uff1a\u4f7f\u7528 pandas \u7684 to_sql() \u65b9\u6cd5\u63d2\u5165\u6570\u636e\u65f6\uff0c\u8bbe\u7f6e na_rep \u53c2\u6570\u4e3a nan \u7684\u66ff\u6362\u503c\uff0c\u4f8b\u5982 null\uff1a<\/p>\n
>>> data.to_sql('student', con, if_exists='append', index=False, na_rep=None)<\/pre>\n
\u672c\u7bc7\u5173\u4e8e\u300aPostgreSQL \u4e2d\u5982\u4f55\u5904\u7406 Python \u7a7a\u503c\u63d2\u5165\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
PostgreSQL \u4e2d\u5982\u4f55\u5904\u7406...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-204995","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204995","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=204995"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204995\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}