{"id":125711,"date":"2024-03-24T19:53:15","date_gmt":"2024-03-24T10:53:15","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/net%e4%b8%adexecutescalar%e7%9a%84%e7%94%a8%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88\/"},"modified":"2024-04-04T15:08:16","modified_gmt":"2024-04-04T06:08:16","slug":"net%e4%b8%adexecutescalar%e7%9a%84%e7%94%a8%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/net%e4%b8%adexecutescalar%e7%9a%84%e7%94%a8%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88\/","title":{"rendered":"NET\u4e2dExecuteScalar\u7684\u7528\u6cd5\u662f\u4ec0\u4e48"},"content":{"rendered":"

.NET \u306e ExecuteScalar \u306f\u3001\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3057\u3066\u7d50\u679c\u30bb\u30c3\u30c8\u306e\u6700\u521d\u306e\u884c\u306e\u6700\u521d\u306e\u5217\u306e\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u901a\u5e38\u306f COUNT(*) \u3084 SUM(column) \u306a\u3069\u306e\u96c6\u7d04\u95a2\u6570\u306b\u3088\u308b\u3001\u5358\u4e00\u5024\u3092\u8fd4\u3059\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u4e00\u822c\u7684\u306aExecuteScalar\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

    \n
  1. SqlConnection\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066\u63a5\u7d9a\u6587\u5b57\u5217\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/li>\n
  2. SqlCommand\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u5b9f\u884c\u3059\u308bSQL\u30af\u30a8\u30ea\u6587\u307e\u305f\u306f\u30b9\u30c8\u30a2\u30c9\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/li>\n
  3. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u958b\u304f\u3002<\/li>\n
  4. \u8c03\u7528ExecuteScalar\u65b9\u6cd5\u6267\u884c\u67e5\u8be2\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230\u4e00\u4e2a\u53d8\u91cf\u4e2d\u3002<\/li>\n
  5. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u9589\u3058\u308b\u3002<\/li>\n<\/ol>\n

    \u4ee5\u4e0b\u306b\u3001ExecuteScalar \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n

    using<\/span> (SqlConnection connection = new<\/span> SqlConnection(connectionString))\r\n{\r\nconnection.Open();\r\nstring<\/span> query = \"SELECT COUNT(*) FROM Customers\"<\/span>;\r\nSqlCommand command = new<\/span> SqlCommand(query, connection);\r\nint<\/span> count = Convert.ToInt32(command.ExecuteScalar());\r\nconnection.Close();\r\nConsole.WriteLine(\"Total number of customers: \"<\/span> + count);\r\n}\r\n<\/code><\/pre>\n
    \u4e0a\u306e\u4f8b\u3067\u306f\u3001Customers \u30c6\u30fc\u30d6\u30eb\u306e\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u6570\u3048\u308b\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3057\u3001\u305d\u306e\u7d50\u679c\u3092 count \u5909\u6570\u306b\u4fdd\u5b58\u3057\u307e\u3057\u305f\u3002\u6700\u5f8c\u306b\u3001\u30ec\u30b3\u30fc\u30c9\u6570\u306e\u5024\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n
    ExecuteScalar\u30e1\u30bd\u30c3\u30c9\u306e\u8fd4\u308a\u5024\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u3067\u3042\u308b\u305f\u3081\u3001\u578b\u5909\u63db\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u7d50\u679c\u3092\u6574\u6570\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u3001Convert.ToInt32\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    .NET \u306e ExecuteScalar \u306f\u3001\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3057\u3066\u7d50\u679c\u30bb\u30c3\u30c8\u306e\u6700\u521d\u306e\u884c\u306e\u6700\u521d\u306e\u5217\u306e\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u901a\u5e38\u306f COUNT(*) \u3084 SUM(column) \u306a\u3069\u306e\u96c6\u7d04\u95a2\u6570\u306b\u3088\u308b\u3001\u5358\u4e00\u5024\u3092\u8fd4\u3059\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u306b\u4f7f […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-125711","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nNET\u4e2dExecuteScalar\u7684\u7528\u6cd5\u662f\u4ec0\u4e48 - 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\/ja\/blog\/net\u4e2dexecutescalar\u7684\u7528\u6cd5\u662f\u4ec0\u4e48\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NET\u4e2dExecuteScalar\u7684\u7528\u6cd5\u662f\u4ec0\u4e48\" \/>\n<meta property=\"og:description\" content=\".NET \u306e ExecuteScalar \u306f\u3001\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3057\u3066\u7d50\u679c\u30bb\u30c3\u30c8\u306e\u6700\u521d\u306e\u884c\u306e\u6700\u521d\u306e\u5217\u306e\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u901a\u5e38\u306f COUNT(*) \u3084 SUM(column) \u306a\u3069\u306e\u96c6\u7d04\u95a2\u6570\u306b\u3088\u308b\u3001\u5358\u4e00\u5024\u3092\u8fd4\u3059\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u306b\u4f7f […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/net\u4e2dexecutescalar\u7684\u7528\u6cd5\u662f\u4ec0\u4e48\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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