{"categories":["\u30a8\u30e9\u30fc\u5bfe\u5fdc","VB.NET","SQL","SQL Server"],"version":"1.0","url":"https://tmg0525.hatenadiary.jp/entry/2018/01/16/221612","title":"\u30c7\u30fc\u30bf\u304c Null \u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u307e\u305f\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u306f Null \u5024\u3067\u547c\u3073\u51fa\u305b\u307e\u305b\u3093\u3002 - VB.NET","blog_title":"TIL","description":"SQL\u3092\u5b9f\u884c\u3057\u3066\u3001\u7d50\u679c\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u3001\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3002 \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u78ba\u304b\u306b\u3001NULL\u306b\u306a\u3063\u3066\u3044\u308b\u3002 \u3067\u3082\u3001\u5024\u304cNULL\u306e\u5217\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u3057\u305f\u3060\u3051\u3067\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3063\u3066\u3069\u3046\u3044\u3046\u3053\u3068\uff01\uff1f \u3053\u306e\u30b5\u30a4\u30c8\u3067\u82f1\u8a33\u3059\u308b\u3068\u3001 Data is Null. This method or property cannot be called on Null values\u3068\u306a\u308b \u89e3\u6c7a\u7b56 NULL\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\u5217\u304b\u3089\u5024\u3092\u53d6\u5f97\u3059\u308b\u3068\u304d\u306b\u306fSqlDataReader.IsDBNull\u3092\u4f7f\u3063\u3066\u3001\u5024\u304cNULL\u3067\u306f\u306a\u3044\u304b\u78ba\u8a8d\u3057\u3066\u304b\u3089\u3001\u5024\u306e\u53d6\u5f97\u3092\u884c\u3046\u3088\u3046\u306b\u3059\u308b ''' <summary> ''' Strin\u2026","type":"rich","provider_name":"Hatena Blog","published":"2018-01-16 22:16:12","author_url":"https://blog.hatena.ne.jp/tmg1998/","image_url":null,"blog_url":"https://tmg0525.hatenadiary.jp/","height":"190","author_name":"tmg1998","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftmg0525.hatenadiary.jp%2Fentry%2F2018%2F01%2F16%2F221612\" title=\"\u30c7\u30fc\u30bf\u304c Null \u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u307e\u305f\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u306f Null \u5024\u3067\u547c\u3073\u51fa\u305b\u307e\u305b\u3093\u3002 - VB.NET - TIL\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog","width":"100%"}