{"id":205340,"date":"2025-05-29T11:36:39","date_gmt":"2025-05-29T03:36:39","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205340\/"},"modified":"2025-05-29T11:36:39","modified_gmt":"2025-05-29T03:36:39","slug":"duckdb%e4%b8%ad%e5%a6%82%e4%bd%95%e6%8c%87%e5%ae%9acsv%e6%96%87%e4%bb%b6%e8%af%bb%e5%8f%96%e6%97%b6%e7%9a%84%e5%ad%97%e6%ae%b5%e7%b1%bb%e5%9e%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205340\/","title":{"rendered":"DuckDB\u4e2d\u5982\u4f55\u6307\u5b9aCSV\u6587\u4ef6\u8bfb\u53d6\u65f6\u7684\u5b57\u6bb5\u7c7b\u578b\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>DuckDB\u4e2d\u5982\u4f55\u6307\u5b9aCSV\u6587\u4ef6\u8bfb\u53d6\u65f6\u7684\u5b57\u6bb5\u7c7b\u578b\uff1f<\/h1>\n<p>\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aDuckDB\u4e2d\u5982\u4f55\u6307\u5b9aCSV\u6587\u4ef6\u8bfb\u53d6\u65f6\u7684\u5b57\u6bb5\u7c7b\u578b\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241129\/173285967167495717ed452.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u9e2d\u5b50\u5982\u4f55\u6307\u5b9a\u5b57\u6bb5\u7c7b\u578b<\/strong><\/p>\n<p>\u5728 duckdb \u4e2d\u8bfb\u53d6 csv \u65f6\uff0c\u6307\u5b9a\u5217\u5b57\u6bb5\u7c7b\u578b\u81f3\u5173\u91cd\u8981\uff0c\u4ee5\u907f\u514d\u7c7b\u578b\u8f6c\u6362\u9519\u8bef\u3002\u5b98\u65b9\u6587\u6863\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<p>\u901a\u8fc7\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528 with (types={{&#8216;column_name&#8217;: &#8216;data_type&#8217;}}) \u8bed\u6cd5\u6307\u5b9a\u5217\u7c7b\u578b\u6620\u5c04\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>query = f\"select * from '{excel_file_path}' with (types={{'\u76d1\u6d4b\u65e5\u671f': 'varchar'}})\"<\/pre>\n<p>\u6ce8\u610f\uff1a\u5fc5\u987b\u5c06\u7c7b\u578b\u503c\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u5982\u793a\u4f8b\u4e2d\u7684 &#8216;varchar&#8217;\u3002<\/p>\n<p>\u4f7f\u7528 read_csv \u51fd\u6570\u8bfb\u53d6 csv \u6587\u4ef6\uff0c\u5e76\u6307\u5b9a types \u53c2\u6570\u4ee5\u63d0\u4f9b\u5217\u7c7b\u578b\u6620\u5c04\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>query = f\"\"\"\nselect *\nfrom read_csv('{csv_file_path}',\n    types = {{\n        'in_system_at': 'varchar',\n        'in_hide_at': 'varchar',\n    }});\n\"\"\"<\/pre>\n<p>\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528 cast \u51fd\u6570\u624b\u52a8\u5c06\u7279\u5b9a\u5217\u5f3a\u5236\u8f6c\u6362\u4e3a\u6240\u9700\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>SELECT\n  CAST(column_name AS data_type) AS converted_column_name\nFROM '{excel_file_path}'<\/pre>\n<p>\u4eca\u5929\u5173\u4e8e\u300aDuckDB\u4e2d\u5982\u4f55\u6307\u5b9aCSV\u6587\u4ef6\u8bfb\u53d6\u65f6\u7684\u5b57\u6bb5\u7c7b\u578b\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DuckDB\u4e2d\u5982\u4f55\u6307\u5b9aCSV\u6587\u4ef6&#46;&#46;&#46;<\/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-205340","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205340","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=205340"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205340\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}