[B! LINQ] InoHiroã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

InoHiro id:InoHiro

LINQã«é–¢ã™ã‚‹InoHiroã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (105)

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InoHiro 2017/04/26
csharp

linq

sql
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InoHiro 2015/02/06
LINQ

sql
ãƒªãƒ³ã‚¯
è¤‡æ•°ã®ãƒ©ãƒ ãƒ€å¼ã‹ã‚‰å¼æœ¨ã‚’æ§‹ç¯‰ã™ã‚‹ - Qiita
å‰èª¬ (int x, int y) => bool ã¨ã„ã†ãƒ©ãƒ ãƒ€å¼ã§è¡¨ã›ã‚‹ Expression<Func<int, int, bool>> å€¤ã‚’ä½œã‚‹ã“ã¨ã‚’è€ƒãˆã‚‹ã€‚ â€¦ã¨ã„ã†ã“ã¨ã§ã€ã“ã® tips ã¯ãƒ©ãƒ ãƒ€å¼ã¯ãƒ©ãƒ ãƒ€å¼ã§ã‚‚ã€å¼æœ¨ã‚’ç”Ÿæˆã™ã‚‹ãƒ©ãƒ ãƒ€å¼ã‚’å¯¾è±¡ã¨ã—ãŸ tips ã¨ãªã‚Šã¾ã™ã€‚ ã“ã®ã¨ãã€(x, y) => x * y < 20 ã¨ (x, y) => x + y == 8 ã¨ã„ã†ãƒ©ãƒ ãƒ€å¼ãŒæ¸¡ã•ã‚ŒãŸã¨ãã€ã“ã® 2 ã¤ã®å¼ã‚’çµ„ã¿åˆã‚ã›ã¦ã€ä¸¡è€…ã‚’æº€ãŸã™ã¨ãã®ã¿ true ã‚’è¿”ã—ã€ãã‚Œä»¥å¤–ã®å ´åˆã¯ false ã‚’è¿”ã™å¼ã‚’ä½œã‚ŠãŸã„ã€‚ ã¤ã¾ã‚Šã€ä»¥ä¸‹ã®ã‚ˆã†ãªæ„Ÿã˜ã§ã€‚ Expression<Func<int, int, bool>> expr1 = (x, y) => x * y < 20; Expression<Func<int, int, bool>> expr2 = (x, y) => x +
InoHiro 2014/01/12
LINQ
ãƒªãƒ³ã‚¯
LINQ ä¸€è¦§ - Qiita
First/FirstOrDefault/Last/LastOrDefault/Single/SingleOrDefault
InoHiro 2014/01/12
LINQ
ãƒªãƒ³ã‚¯
[C#]å¼æœ¨å…¥é–€
C#ã®å¼æœ¨ã«ã¤ã„ã¦å‹‰å¼·ã—ãªãŒã‚‰ã€å‹‰å¼·ã—ãŸã“ã¨ã®ç†è§£ã‚’æ›¸ã„ã¦ã„ãã¾ã™ã€‚ å¼æœ¨ã£ã¦ãªã«ï¼Ÿ å¼æœ¨(Expression tree)ã¨ã¯ã€å¼(æ•°å¼)ã‚’æœ¨æ§‹é€ ã§è¡¨ã—ãŸã‚‚ã®ã®äº‹ã§ã™ã€‚ ä»¥ä¸‹ã®æ§˜ãªå¼ã‚’ä¾‹ã«ã—ã¾ã™ã€‚ int result = 5 + 7 * 3; // result == 26 ã“ã®å¼ã‚’ã¿ã‚‹ã¨ãã€åŠ ç®—æ¼”ç®—å(+)ã‚’Addé–¢æ•°ã€ä¹—ç®—æ¼”ç®—å(*)ã‚’Multiplyé–¢æ•°ã¨ã™ã‚‹ã¨ã“ã‚“ãªæ„Ÿã˜ã§ã™ãã€‚ int result = Add(5, Multiply(7, 3)); ã¡ã‚‡ã£ã¨æ”¹è¡Œã¨ã‹ã‚¤ãƒ³ãƒ‡ãƒ³ãƒˆã‚’å…¥ã‚Œã¦ã¿ã¾ã™ã€‚ int result = Add( 5, Multiply( 7, 3 ) ); ãªã‚“ã¨ãªãæœ¨æ§‹é€ ã«ã¿ãˆã¦ãã¾ã›ã‚“ã‹ï¼Ÿå›³ã«ã—ã¦ã¿ã¾ã™ã€‚ ã¯ã„ã€ã©ãƒ¼ã¿ã¦ã‚‚æœ¨ã§ã™ã€‚ã“ã®ã‚ˆã†ã«å¼ã¯æœ¨ã§è¡¨ç¾ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ã“ã‚ŒãŒå¼æœ¨ã§ã™ã€‚ ãªã«ã«ã¤ã‹ã†ã®ï¼Ÿ å¼ãŒæœ¨ã§è¡¨ã›ã‚‹ã“ã¨ãŒã‚ã‹ã‚Šã¾ã—ãŸã€‚ã—ã‹ã—ã“ã‚Œã¯ä½•ã®
InoHiro 2014/01/12
ExpressionTree

LINQ
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å…¨ã¦ãŒå¼ã«ãªã‚‹ï¼Œå…¨ã¦ãŒæœ¨ã«ãªã‚‹ï¼Œå…¨ã¦ãŒå¼æœ¨ã«ãªã‚‹ - NyaRuRuãŒåœ°çƒã«ã„ãŸã“ã‚
é–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒžã¯ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æœ¨ã ã¨æ€ã£ã¦ã‚‹ã‚‰ã—ã„ï¼Œã‚ˆã‚Š ã‚‚ã„ã£ã“ yhara ãã‚“ã®ã¨ã“ã‚ã‹ã‚‰ï¼Ž é–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒžã¯ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æœ¨ã ã¨æ€ã£ã¦ã‚‹ã‚‰ã—ã„ gauche.nightã§å‡ºãŸè©±é¡Œã ã‘ã©ã€é–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒžã¯ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æœ¨ã ã¨æ€ã£ã¦ã‚‹ã‚‰ã—ã„ã€‚ (car (string-split (string-reverse (string-upcase str)) "\n")) ã†ã‚“ã€ã“ã‚Œã¯æœ¨ã ã€‚ head $ lines $ reverse $ upcase str Haskellã ã¨ $ ãŒã‚ã‚‹ã‹ã‚‰è¦‹ãŸç›®ã¯ãƒã‚¹ãƒˆã—ã¦ãªã„ã‘ã©ã€å®Ÿéš›ã«ã¯é–¢æ•°ã«é–¢æ•°ã®è¿”ã‚Šå€¤ã‚’æ¸¡ã—ã¦ã„ã‚‹ã€‚ ãã†ã€é–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒžã¯é–¢æ•°å‘¼ã³å‡ºã—ã®ä¸ã«é–¢æ•°ã‚’æ›¸ãã“ã¨ã«æŠµæŠ—ãŒãªã„ã€‚ã§ã‚‚Cè¨€èªžã¨ã‹ã ã¨ã•ã€é–¢æ•°å‘¼ã³å‡ºã—ã®ä¸ã«é–¢æ•°ã£ã¦æ›¸ã‹ãªã„ã˜ã‚ƒã‚“ã€æ™®é€šã€‚ã™ã”ãçŸã„ã‚„ã¤ã‚’é™¤ã‘ã°ã€ã ã„ãŸã„ä¸€æ—¦å¤‰æ•°ã«ä»£å…¥ã™ã‚‹ã§ã—ã‚‡ã€‚ ãã®ã¸ã‚“ã®é•ã„ãŒé–¢æ•°åž‹è¨€èªžã‚’å¦
InoHiro 2014/01/12
ExpressionTree

LINQ
ãƒªãƒ³ã‚¯
[C#][ãƒ©ãƒ ãƒ€å¼][å¼æœ¨] Expression ã®æ§‹é€ ã‚’èª¿ã¹ã¦ã¿ã‚‹ (ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚° C# - ç¿”ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ (Sho's))
ã€ŒåŒ¿åãƒ¡ã‚½ãƒƒãƒ‰ã¨ãƒ©ãƒ ãƒ€å¼ã®é•ã„ã€ã¨äº‘ã†è¨˜äº‹ã§ã€åŒ¿åãƒ¡ã‚½ãƒƒãƒ‰ã¨ãƒ©ãƒ ãƒ€å¼ã®æ„å‘³ã®é•ã„ã«ã¤ã„ã¦è€ƒãˆãŸã€‚ ã€Œãƒ©ãƒ ãƒ€å¼ã‚’ Expression ã¨ã—ã¦æ‰±ã£ã¦ã„ã‚‹å ´åˆã¯ã€åŒ¿åãƒ¡ã‚½ãƒƒãƒ‰ã¯ä»£ã‚ã‚Šã«ã¯ãªã‚‰ãªã„ã€ã¨è¿°ã¹ãŸãŒã€ãƒ©ãƒ ãƒ€å¼ã‚’ Expression ã¨ã—ã¦æ‰±ã†ä¾‹ã«ã¤ã„ã¦ã€ã“ã‚Œã‹ã‚‰æ•°å›žã«åˆ†ã‘ã¦æ›¸ã„ã¦ã„ããŸã„ã€‚ ãƒ©ãƒ ãƒ€å¼ã‚’ Expression ã¨ã—ã¦æ‰±ã†ä¾‹ã‚’æŒ™ã’ã‚‹å‰ã«ã€ä»Šå›žã¯ã€å…ˆãšã¯ Expression è‡ªä½“ã«ã¤ã„ã¦ç†è§£ã‚’æ·±ã‚ãŸã„ã¨æ€ã†ã€‚ Expression ã¯ã©ã®ã‚ˆã†ãªæ§‹é€ ã‚’ã—ã¦ã„ã‚‹ã®ã ã‚ã†ã‹? ä¸ãŒã©ã†ãªã£ã¦ã„ã‚‹ã®ã‹ã‚’è¦‹ã¦ã¿ã‚‹ã“ã¨ã«ã—ã‚ˆã†ã€‚ â– Expression ã‚’ãƒ‡ãƒãƒƒã‚¬ãƒ¼ã§è¦³å¯Ÿã—ã¦ã¿ã‚ˆã† æ‰‹å§‹ã‚ã«ã€Visual Studio ã®ãƒ‡ãƒãƒƒã‚¬ãƒ¼ã‚’ç”¨ã„ã¦ Expression ã®ä¸ã‚’è¦—ã„ã¦ã¿ã‚‹ã€‚ ãƒ©ãƒ ãƒ€å¼ã¨ã—ã¦è¶³ã—ç®—ã‚’è¡Œã†ã ã‘ã® (x, y) => x + y ã¨äº‘ã†ã‚·ãƒ³ãƒ—ãƒ«ãªã‚‚ã®ã‚’ç”¨æ„ã—ã€ã“ã‚Œ
InoHiro 2014/01/12
ExpressionTree

LINQ
ãƒªãƒ³ã‚¯
mongoDBã‚‚LINQã§è¡Œã“ã†ï¼ - ã‘ã•ã‚‰ã‚“ã±ã•ã‚‰ã‚“
ã“ã®è¨˜äº‹ã¯ã€C# Advent Calender 2012 ã®13æ—¥ç›®ã®è¨˜äº‹ã§ã™ã€‚ å‰æ—¥ã®è¨˜äº‹ã¯ã€@masakã•ã‚“ã®C# 5.0 ã§å¤‰ã‚ã£ãŸäº‹ - foreach ã®ç ´å£Šçš„å¤‰æ›´ã§ã™ã€‚ è‡ªåˆ†ã¯ã‚ã¾ã‚Šæ·±ã„ã“ã¨ã¯æ›¸ã‘ã¾ã›ã‚“ã®ã§æœ€è¿‘ã¡ã‚‡ã£ã¨è§¦ã‚Šå§‹ã‚ãŸmongo DBã‚’æ“ä½œã™ã‚‹æ–¹æ³•ã‚’ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ å§‹ã‚ã« mongo DBã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯2.2.0ã§Windowsã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦ã„ã¾ã™ã€‚ C#ãƒ‰ãƒ©ã‚¤ãƒã¯1.7ã‚’ä½¿ç”¨ã—ã¾ã™ã€‚ï¼ˆç‰¹ã«1.7ã§ãªã„ã¨å‡ºæ¥ãªã„ã‚ˆã†ãªã“ã¨ã¯ã—ã¦ã„ãªã„ã§ã™ï¼‰ ã–ã£ãã‚Šmongo DBã¨ã¯ çªç„¶ã€mongo DBã‚’LINQã§æ¤œç´¢ã—ã¦ã‚‚mongo DBãŒè‰¯ãåˆ†ã‹ã‚‰ãªã„æ–¹ã‚‚ã„ã‚‹ã¨æ€ã†ã®ã§ ã¾ãšç°¡å˜ã«mongo DBã£ã¦ãªã‚“ãªã®ã£ã¦è©±ã€‚ mongo DBã¯ã€æ‰€è¬‚NoSQLã«åˆ†é¡žã•ã‚Œã‚‹ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã§ã™ã€‚ ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆæŒ‡å‘DBã§ã‚¹ã‚ãƒ¼ãƒžãƒ¬ã‚¹ãªã®ã§ã™ã€‚ ãƒ‡ãƒ¼ã‚¿ã¯BSONã¨å‘¼ã°ã‚Œã‚‹JSONã¡ã£ããªæ§‹é€
InoHiro 2014/01/11
LINQ

MongoDB
ãƒªãƒ³ã‚¯
An Internal of LINQ to Objects
1. An Internal of LINQ to Objects 2013/12/14 Yoshifumi Kawai - @neuecc 2. Self Introduction @ä»•äº‹ æ ªå¼ä¼šç¤¾ã‚°ãƒ©ãƒ‹ å–ç· å½¹CTO C# 5.0 + .NET Framework 4.5 + ASP.NET MVC 5 æœ€å…ˆç«¯C#ã«ã‚ˆã‚‹ãƒã‚¤ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹Webã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ @å€‹äººæ´»å‹• Microsoft MVP for Visual C# Web http://neue.cc/ Twitter @neuecc LINQãŒã²ã˜ã‚‡ãƒ¼ã«å¥½ãã€è¶£å‘³ã¯ãƒ©ã‚¤ãƒ–ãƒ©ãƒªä½œæˆ 3. As Librarian NuGetå…¬é–‹ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸æ•°30çªç ´ https://www.nuget.org/profiles/neuecc/ linq.js JavaScriptã«LINQ to Objectsã‚’ç§»æ¤ã—ãŸãƒ©ã‚¤ãƒ–ãƒ©ãƒª http
InoHiro 2014/01/10
LINQ
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ãƒ¡ãƒ«ãƒžï¼ã‚µãƒ¼ãƒ“ã‚¹çµ‚äº†ã®ãŠçŸ¥ã‚‰ã› ã„ã¤ã‚‚ãƒ¡ãƒ«ãƒžï¼ã‚’ã”åˆ©ç”¨ã„ãŸã ãèª ã«ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã™ã€‚ ã‚µãƒ¼ãƒ“ã‚¹é–‹å§‹ä»¥æ¥ã€ãŸãã•ã‚“ã®çš†æ§˜ã«ã”åˆ©ç”¨ã„ãŸã ãã¾ã—ãŸãƒ¡ãƒ«ãƒžï¼ã§ã™ãŒã€ èª ã«å‹æ‰‹ãªãŒã‚‰ã€2020å¹´1æœˆæœ«ã‚’æŒã£ã¦ä¸€éƒ¨ã‚’é™¤ãã‚µãƒ¼ãƒ“ã‚¹ã‚’çµ‚äº†ã•ã›ã¦ã„ãŸã ãäº‹ã¨ãªã‚Šã¾ã—ãŸã€‚ ä»Šã¾ã§ã®ã”æ„›é¡§ã€èª ã«ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã—ãŸã€‚ 1æœˆæœ«ä»¥é™ã®ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ«ã¯ä»¥ä¸‹ã¨ãªã‚Šã¾ã™ã€‚ ï¼ˆã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ«ã¯å¤‰æ›´ã¨ãªã‚‹å¯èƒ½æ€§ãŒã‚ã‚Šã¾ã™ï¼‰ 2020å¹´2æœˆ14æ—¥ ãƒžã‚¤ãƒ¡ãƒ«ãƒžã§ã®è¨˜äº‹ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰æ©Ÿèƒ½ã®åœæ¢ï¼ˆãƒžã‚¤ãƒ¡ãƒ«ãƒžã®åœæ¢ï¼‰ 2020å¹´3æœˆ2æ—¥ å…¨ã¦ã®ãƒ‡ãƒ¼ã‚¿ã‚’å‰Šé™¤ è¨˜äº‹ãƒ‡ãƒ¼ã‚¿ã®ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰æ©Ÿèƒ½ã«é–¢ã—ã¦ã¯ã€ãƒžã‚¤ãƒ¡ãƒ«ãƒžã‚ˆã‚Šã”åˆ©ç”¨ãã ã•ã„ã€‚ ä»Šã¾ã§ã”åˆ©ç”¨ã„ãŸã ãã¾ã—ã¦ã€æœ¬å½“ã«ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã—ãŸã€‚ ã‚µãƒ¼ãƒ“ã‚¹çµ‚äº†ã«ä¼´ã†Q&A Q. èªè€…ã®ãƒ¡ãƒ¼ãƒ«ã‚¢ãƒ‰ãƒ¬ã‚¹ã¯å…¬é–‹ã•ã‚Œã¾ã™ã‹ï¼Ÿ A. ãƒ¡ãƒ¼ãƒ«ã‚¢ãƒ‰ãƒ¬ã‚¹ã¯ã™ã¹ã¦ãƒ¡ãƒ«ãƒžï¼ã§ãŠé ã‹ã‚Šã—ã¦ã„ã‚‹ã‚‚ã®ã¨ãªã‚Šã¾ã™ã€‚ å¤§å¤‰ç”³
InoHiro 2014/01/10
LINQ
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More LINQ with System.Interactive â€“ Getting Started - B# .NET Blog
With the recent release of the Reactive Extensions for .NET (Rx) on DevLabs, youâ€™ll hear quite a bit about reactive programming, based on the IObservable<T> and IObserver<T> interfaces. A great amount of resources is available on Channel 9. In this series, Iâ€™ll focus on the dual of the System.Reactive assem bly, which is System.Interactive, providing a bunch of extensions to the LINQ Standard Query
InoHiro 2014/01/10
LINQ
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The Essence of LINQ â€“ MinLINQ - B# .NET Blog
B# .NET Blog Bart De Smet's on-line blog (0x2B | ~0x2B, that's the question) Introduction Before reaching the catharsis in the â€œMore LINQ with System.Interactiveâ€ series over here, I wanted to ensure a solid understanding of the essence of LINQ in my reader base. Often people forget the true essence of a techno logy due to the large number of auxiliary frameworks and extensions that are being provi
InoHiro 2014/01/10
LINQ
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What is the purpose of LINQ's Expression.Quote method?
InoHiro 2014/01/10
LINQ
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The Pain of Implementing LINQ Providers - ACM Queue
July 6, 2011 Volume 9, issue 7 PDF The Pain of Implementing LINQ Providers It's no easy task for NoSQL Oren Eini, aka Ayende Rahien I rem ember sitting on the edge of my seat watching the 2005 PDC (Professional Developers Conference) videos that first showed LINQ (Language Integrated Query). I wanted LINQ: it offered just about everything that I could hope for to make working with data easy. The im
InoHiro 2014/01/10
LINQ
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Entity Framework - Linq query with order by and group by
InoHiro 2014/01/08
LINQ
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LINQ: how to get a group of a table ordering with a related table?
InoHiro 2014/01/08
LINQ
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system.objectdisposedexception-cannot-access-a-disposed-object.--getting-linq-to.aspx
InoHiro 2014/01/08
LINQ
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Using custom grouping operators in LINQ
InoHiro 2014/01/08
LINQ
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Is there something like LINQ for Java?
InoHiro 2014/01/08
LINQ

scala
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Ruby 1.9.0 Enumerable ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¨ LINQ Standard Operators å¯¾å¿œè¡¨ (æ›¸ãã‹ã‘) - NyaRuRuãŒåœ°çƒã«ã„ãŸã“ã‚
æ›¸ã„ãŸã‚ã‘ yhara ãã‚“ã®ã€Žãã‚Œany?ã§ã€ã‚’èªã‚“ã§ã„ã¦ï¼ŒEnumerable.Any ãƒ¡ã‚½ãƒƒãƒ‰ (System.Linq)ã€ãŒæ¥ã‚‹ã®ãŒé¢ç™½ã‹ã£ãŸã®ã§ä½œã£ã¦ã¿ãŸï¼Žã€ŒåŒåŒ–ã¯ã™ã§ã«å§‹ã¾ã£ã¦ã„ã‚‹ã®ã ï¼ã€ å¯¾å¿œè¡¨ ã‚‹ã‚Šã¾ã®ã€Œhttp://doc.loveruby.net/refm/api/view/class/Enumerable:title=ã€ã¨ MSDN Library ã®ã€ŒEnumerable ãƒ¡ã‚½ãƒƒãƒ‰ (System.Linq)ã€ã¨ã‚’ã«ã‚‰ã‚ã£ã“ã—ãªãŒã‚‰ã–ã£ã¨åˆ†ã‹ã‚‹ç¯„å›²ã§ãƒžãƒƒãƒ”ãƒ³ã‚°ï¼Žé–“é•ã„ã‚ã‚Šãã†ãªã®ã§ã”æ³¨æ„ã‚’ï¼Žã•ã‚‰ã«å¯¾å¿œé–¢ä¿‚ãŒå¾®å¦™ãªå¥´ã‚‚ ? ãƒžãƒ¼ã‚¯ä»˜ã‘ã¦ãŸã‚Šãã‚‚ãã‚‚å¯¾å¿œã™ã‚‹ã‚‚ã®ãŒç„¡ã„ã“ã¨ã«ã—ã¦ã„ãŸã‚Šçµæ§‹é©å½“ãªã®ã§ã”æ³¨æ„ã‚’ï¼Ž ã¨ã‚Šã‚ãˆãšã‚³ãƒ”ãƒšã—ãŸã‚‚ã®ã‚’ã²ãªå½¢ã«ä½¿ã†ç‰ã—ã¦ï¼Œèª°ã‹å®Œæˆã•ã›ã¦ä¸‹ã•ã„ã¾ã›ï¼Žã‚ã¨ã¤ã„ã§ã« prototype.js ã® Enumerable ã¨ã®ãƒžãƒƒãƒ”ãƒ³ã‚°ã‚‚ã‚„ã£ã¦ãã‚Œ
InoHiro 2014/01/08
ruby

LINQ
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