{"id":45143,"date":"2023-08-20T14:38:40","date_gmt":"2023-07-06T06:50:58","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45143-2\/"},"modified":"2024-04-30T19:22:30","modified_gmt":"2024-04-30T11:22:30","slug":"45143-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45143-2\/","title":{"rendered":""},"content":{"rendered":"

Hi, there\uff01 Rust \u304c\u5927\u597d\u304d SAmmys \u3060\u3088\uff01<\/p>\n

\u4eca\u65e5\u306f\u30bf\u30a4\u30c8\u30eb\u306e\u901a\u308a\u3001MySQL\u306bDateTime\u578b\u3067\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u60c5\u5831\u3092Rust\u3067NaiveDateTime\u5f62\u3067\u53d6\u308a\u51fa\u3059\u5185\u5bb9\u3060\u3088\u3002
\n\u30fb\u30fb\u30fb\u3048\u3001\u305d\u308c\u3060\u3051\uff1f\u306e\u5185\u5bb9\u3060\u3051\u3069\u5099\u5fd8\u9332\u3068\u3057\u3066\u6b8b\u3057\u3066\u304a\u304f\u3088\u3002<\/p>\n

\u524d\u63d0\u3068\u3057\u3066\u3001\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u5143\u306e\u30c6\u30fc\u30d6\u30eb\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f5c\u6210\u3057\u305f\u3093\u3060\u3002<\/p>\n

CREATE<\/span> TABLE<\/span> files<\/span> (<\/span>\r\n    created_at<\/span> DATETIME<\/span>,<\/span>\r\n    prefix<\/span> VARCHAR<\/span>(<\/span>255<\/span>),<\/span>\r\n    name<\/span> VARCHAR<\/span>(<\/span>255<\/span>),<\/span>\r\n    INDEX<\/span> idx_created_at<\/span> (<\/span>created_at<\/span>)<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u305d\u3057\u3066\u3001RUST\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u672c\u4f53\u306f\u4ee5\u4e0b\u3002\uff08sqlx\u30af\u30ec\u30fc\u30c8\u3092\u4f7f\u3063\u3066\u308b\u3088\uff09<\/p>\n
\u2026\uff08<\/span>\u524d\u7565<\/span>\uff09\u2026<\/span>\r\n\r\nlet<\/span> query_result<\/span> =<\/span> sqlx<\/span>::<\/span>query_as!<\/span>(<\/span>\r\n    FileInfo<\/span>,<\/span>\r\n    \"SELECT * FROM files WHERE name = ?\"<\/span>,<\/span>\r\n    file_name<\/span>\r\n)<\/span>.fetch_one<\/span>(<\/span>&<\/span>data<\/span>.db<\/span>)<\/span>.await<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u305d\u3057\u3066\u3001\u3053\u3053\u3067\u4f7f\u7528\u3057\u3066\u3044\u308bFileInfo\u306eStruct\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002<\/p>\n
use<\/span> chrono<\/span>::{<\/span>prelude<\/span>::<\/span>*<\/span>,<\/span> naive<\/span>::<\/span>NaiveDate<\/span>};<\/span>\r\nuse<\/span> serde<\/span>::{<\/span>Deserialize<\/span>,<\/span> Serialize<\/span>};<\/span>\r\n\r\n#[derive(Debug,<\/span> Deserialize,<\/span> Default)]<\/span>\r\npub<\/span> struct<\/span> FileInfo<\/span> {<\/span>\r\n    pub<\/span> created_at<\/span>:<\/span> NaiveDateTime<\/span>,<\/span>\r\n    pub<\/span> prefix<\/span>:<\/span> String<\/span>,<\/span>\r\n    pub<\/span> name<\/span>:<\/span> String<\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u305d\u3057\u305f\u3089\u306d\u3001\u30a8\u30e9\u30fc\u3068\u3057\u3066\u3053\u3046\u3044\u3063\u305f\u5185\u5bb9\u3046\u304c\u51fa\u3066\u304d\u305f\u306e\u3055\u3002<\/p>\n
error<\/span>[<\/span>E0277<\/span>]:<\/span> the<\/span> trait<\/span> bound<\/span> `<\/span>NaiveDate<\/span>:<\/span> std<\/span>::<\/span>convert<\/span>::<\/span>From<\/span><<\/span>std<\/span>::<\/span>option<\/span>::<\/span>Option<\/span><<\/span>NaiveDateTime<\/span>>><\/span>`<\/span> is<\/span> not<\/span> satisfied<\/span>\r\n   -<\/span>-><\/span> src<\/span>\/<\/span>handler<\/span>.rs<\/span>:<\/span>390<\/span>:<\/span>40<\/span>\r\n    |<\/span>\r\n390<\/span> |<\/span>                       let<\/span> query_result<\/span> =<\/span> sqlx<\/span>::<\/span>query_as!<\/span>(<\/span>\r\n    |<\/span>  ________________________________________<\/span>^<\/span>\r\n391<\/span> |<\/span> |<\/span>                         FileInfo<\/span>,<\/span>\r\n392<\/span> |<\/span> |<\/span>                         \"SELECT * FROM files WHERE name = ?\"<\/span>,<\/span>\r\n393<\/span> |<\/span> |<\/span>                         filename<\/span>\r\n394<\/span> |<\/span> |<\/span>                     )<\/span>\r\n    |<\/span> |<\/span>_____________________<\/span>^<\/span> the<\/span> trait<\/span> `<\/span>std<\/span>::<\/span>convert<\/span>::<\/span>From<\/span><<\/span>std<\/span>::<\/span>option<\/span>::<\/span>Option<\/span><<\/span>NaiveDateTime<\/span>>><\/span>`<\/span> is<\/span> not<\/span> implemented<\/span> for<\/span> `<\/span>NaiveDate<\/span>`<\/span>\r\n    |<\/span>\r\n    =<\/span> help<\/span>:<\/span> the<\/span> trait<\/span> `<\/span>std<\/span>::<\/span>convert<\/span>::<\/span>From<\/span><<\/span>NaiveDateTime<\/span>><\/span>`<\/span> is<\/span> implemented<\/span> for<\/span> `<\/span>NaiveDate<\/span>`<\/span>\r\n    =<\/span> note<\/span>:<\/span> required<\/span> for<\/span> `<\/span>std<\/span>::<\/span>option<\/span>::<\/span>Option<\/span><<\/span>NaiveDateTime<\/span>><\/span>`<\/span> to<\/span> implement<\/span> `<\/span>Into<\/span><<\/span>NaiveDate<\/span>><\/span>`<\/span>\r\n    =<\/span> note<\/span>:<\/span> this<\/span> error<\/span> originates<\/span> in<\/span> the<\/span> macro<\/span> `$<\/span>crate<\/span>::<\/span>sqlx_macros<\/span>::<\/span>expand_query<\/span>`<\/span> which<\/span> comes<\/span> from<\/span> the<\/span> expansion<\/span> of<\/span> the<\/span> macro<\/span> `<\/span>sqlx<\/span>::<\/span>query_as<\/span>`<\/span> (<\/span>in<\/span> Nightly<\/span> builds<\/span>,<\/span> run<\/span> with<\/span> -<\/span>Z<\/span> macro<\/span>-<\/span>backtrace<\/span> for<\/span> more<\/span> info<\/span>)<\/span>\r\n<\/code><\/pre>\n
Rust\u304b\u3089\u3057\u305f\u3089\u3001
\n\u300cDB \u306b null \u304c\u5165\u3063\u3066\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3093\u3060\u304b\u3089\u3001Option<> \u4ed8\u3051\u3066 null \u306e\u5bfe\u5fdc\u306b\u5099\u3048\u3066\u304a\u3051\u3088\uff01\u300d
\n\u3063\u3066\u3053\u3068\u306a\u3093\u3060\u306d\u3002<\/p>\n
\u7d50\u5c40\u3001Struct \u306e\u5ba3\u8a00\u3092\u4ee5\u4e0b\u306b\u4fee\u6b63\u3059\u308c\u3070\u7d42\u4e86\u3060\u3063\u305f\u3088\u3001\u3063\u3066\u8a71\u3002<\/p>\n
use<\/span> chrono<\/span>::{<\/span>prelude<\/span>::<\/span>*<\/span>,<\/span> naive<\/span>::<\/span>NaiveDate<\/span>};<\/span>\r\nuse<\/span> serde<\/span>::{<\/span>Deserialize<\/span>,<\/span> Serialize<\/span>};<\/span>\r\n\r\n#[derive(Debug,<\/span> Deserialize,<\/span> Default)]<\/span>\r\npub<\/span> struct<\/span> FileInfo<\/span> {<\/span>\r\n    pub<\/span> created_at<\/span>:<\/span> Option<\/span><<\/span>NaiveDateTime<\/span>><\/span>,<\/span>\r\n    pub<\/span> prefix<\/span>:<\/span> Option<\/span><<\/span>String<\/span>><\/span>,<\/span>\r\n    pub<\/span> name<\/span>:<\/span> Option<\/span><<\/span>String<\/span>><\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4eca\u56de\u306e\u3068\u306f\u8a71\u304c\u9038\u308c\u308b\u3051\u3069\u3001REST API \u3067\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30de\u30eb\u30c1\u30d1\u30fc\u30c8\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3067\u53d7\u3051\u53d6\u3063\u305f\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3092 6MB \u3054\u3068\u306b\u30d7\u30fc\u30eb\u3055\u305b\u3066 AWS \u306e S3 \u306b\u30de\u30eb\u30c1\u30d1\u30fc\u30c8\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u305f\u3088\u3002
\n\u3064\u307e\u308a\u3001\u30e1\u30e2\u30ea\u304c 1 GB \u306e\u30de\u30b7\u30f3\u306b REST API\u30b5\u30fc\u30d0\u30fc\u3092\u683c\u7d0d\u3057\u3066\u3044\u3066\u3082\u3001\u4f8b\u3048\u3070 20 GB \u306e\u30d5\u30a1\u30a4\u30eb\u3092 REST API \u3092\u7d4c\u7531\u3057\u3066 S3\u306b\u30de\u30eb\u30c1\u30d1\u30fc\u30c8\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3067\u304d\u308b\u3001\u3063\u3066\u3053\u3068\u306d?
\n\u3053\u3046\u3044\u3046\u4f4e\u30ec\u30a4\u30e4\u30fc\u306e\u5236\u5fa1\u304c\u3067\u304d\u308bRust\u3001\u672c\u5f53\u306b\u5927\u597d\u304d?
\n\u305d\u308c\u3067\u3044\u3066\u30e1\u30e2\u30ea\u3082\u5b89\u5168?
\n\u305d\u308c\u3067\u3044\u3066\u51e6\u7406\u3082\u9ad8\u901f?<\/p>\n
\u3042\u30fc\u5927\u597d\u304dRust\uff01\uff01\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Hi, there\uff01 Rust \u304c\u5927\u597d\u304d SAmmys \u3060\u3088\uff01 \u4eca\u65e5\u306f\u30bf\u30a4\u30c8\u30eb\u306e\u901a\u308a\u3001MySQL\u306bDateTi […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45143","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45143-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Hi, there\uff01 Rust \u304c\u5927\u597d\u304d SAmmys \u3060\u3088\uff01 \u4eca\u65e5\u306f\u30bf\u30a4\u30c8\u30eb\u306e\u901a\u308a\u3001MySQL\u306bDateTi […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45143-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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