{"id":53,"date":"2010-08-06T19:28:04","date_gmt":"2010-08-06T19:28:04","guid":{"rendered":"http:\/\/blog.yyhcw.com\/post\/53.html"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T07:54:17","slug":"","status":"publish","type":"post","link":"http:\/\/blog.yyhcw.com\/post\/53.html","title":{"rendered":"\u4e0d\u80fd\u6bd4\u8f83\u6216\u6392\u5e8f text\u3001ntext \u548c image \u6570\u636e\u7c7b\u578b\uff0c\u9664\u975e\u4f7f\u7528 IS NULL \u6216 LIKE \u8fd0\u7b97\u7b26\u3002"},"content":{"rendered":"<p>\u3000\u3000\u4eca\u5929\u5728\u4fee\u6539<a target=\"_blank\" href=\"http:\/\/www.21863.cn\">\u90d1\u5dde\u5bb6\u653f\u7f51<\/a>\u7684\u65f6\u5019,\u9047\u5230\u4e00\u4e2a\u5f88\u90c1\u95f7\u7684\u4e8b\u60c5&ldquo;<strong><a target=\"_blank\" href=\"\/post\/53.html\">\u4e0d\u80fd\u6bd4\u8f83\u6216\u6392\u5e8f text\u3001ntext \u548c image \u6570\u636e\u7c7b\u578b\uff0c\u9664\u975e\u4f7f\u7528 IS NULL \u6216 LIKE \u8fd0\u7b97\u7b26\u3002<\/a><\/strong>&rdquo;\uff0c\u672c\u4eba\u4f7f\u7528\u7684MSSQL \u539f\u6765\u4f7f\u7528ACCESS\u6570\u636e\u5e93\u7684\u65f6\u5019\u5565\u65f6\u5019\u4e5f\u6ca1\u6709\u9047\u5230\u8fc7\u8fd9\u6837\u7684\u95ee\u9898\u554a\uff01\u539f\u6765\u8fd8\u4ee5\u4e3a\u662f\u81ea\u5df1\u7684SQL\u8bed\u53e5\u5199\u9519\u4e86\uff0c\u7acb\u523b\u5728sql \u67e5\u8be2\u5206\u6790\u5668\u4e2d\u8fdb\u884c\u6d4b\u8bd5\uff0c\u53d1\u73b0\u53ef\u4ee5\u6b63\u5e38\u5206\u6790\u67e5\u8be2\uff0c\u4f46\u662f\u60f3\u8981\u6267\u884c\u7684\u65f6\u5019\u5c31\u51fa\u73b0\u4e86&ldquo;\u670d\u52a1\u5668: \u6d88\u606f 306\uff0c\u7ea7\u522b 16\uff0c\u72b6\u6001 1\uff0c\u884c 1<br \/><a target=\"_blank\" href=\"\/post\/53.html\">\u4e0d\u80fd\u6bd4\u8f83\u6216\u6392\u5e8f text\u3001ntext \u548c image \u6570\u636e\u7c7b\u578b\uff0c\u9664\u975e\u4f7f\u7528 IS NULL \u6216 LIKE \u8fd0\u7b97\u7b26\u3002&rdquo;<\/a>\u90c1\u95f7\uff01\u8d76\u5feb\u4e0a\u7f51\u67e5\u627e\uff0c\u53d1\u73b0\u5728MS Sql\u6570\u636e\u5e93\u4e2d\uff0c\u5982\u679ctable\u4e2d\u7684\u67d0column\u6570\u636e\u7c7b\u578b\u8bbe\u8ba1\u4e3antext\u6216\u8005text\uff0c\u505a\u67e5\u8be2\u5339\u914d\u65f6\uff0c\u7528=\u64cd\u4f5c\u4f1a\u5f15\u8d77\uff1a<\/p>\n<p><span style=\"color: #ff0000\">\u3000\u3000The data types ntext and varchar are incompatible in the equal to operator.\u3000<\/span>\u6216\u3000<a style=\"color: #ff0000\" target=\"_blank\" href=\"\/post\/53.html\">\u4e0d\u80fd\u6bd4\u8f83\u6216\u6392\u5e8f text\u3001ntext \u548c image \u6570\u636e\u7c7b\u578b\uff0c\u9664\u975e\u4f7f\u7528 IS NULL \u6216 LIKE \u8fd0\u7b97\u7b26\u3002<\/a><\/p>\n<p><span>\u56e0\u4e3a&nbsp;\u7528&lsquo;&rsquo;\u5f15\u8d77\u6765\u7684\u5b57\u7b26\u4e32\u9ed8\u8ba4\u7684\u6570\u636e\u7c7b\u578b\u4e3anvarchar\uff0cntext\u7c7b\u578b\u7684\u6570\u636e\u4e0envarcahr\u7c7b\u578b\u6570\u636e\u4e0d\u80fd\u76f4\u63a5\u505a\u6bd4\u8f83\u3002<\/span><\/p>\n<p>\u3000\u3000\u6bd4\u5982\uff0c\u5982\u4e0b\u4e00\u4e2a\u67e5\u8be2:<\/p>\n<p><span>\u3000\u3000select * from myTable where myColumnOne = 'some value'<\/span><\/p>\n<p><span>\u3000\u3000\u5176\u4e2d\uff0cmyColumnOne\u6570\u636e\u7c7b\u578b\u4e3antext,\u6267\u884c\u8be5\u8bed\u53e5\u540e\uff0c\u5c31\u4f1a\u51fa\u73b0\u4e0a\u8ff0\u7ea2\u8272\u6807\u8bb0\u7684\u9519\u8bef\u3002<\/span><\/p>\n<p><span style=\"color: #ff0000\">\u89e3\u51b3\u529e\u6cd5\u5982\u4e0b<\/span>\uff1a<\/p>\n<p>\u4e00\uff1a\u5c06\u8868\u91cc\u7684\u5b57\u6bb5\u7c7b\u578b\u4e3atext\u6216\u662fntext\u7684\u6539\u4e3avarchar\u7c7b\u578b\uff1b<br \/>\u4e8c\uff1a\u7c7b\u578b\u8f6c\u6362<br \/>\u3000\u3000\u5c06\u6240\u8981\u5339\u914d\u7684\u5b57\u6bb5\u8f6c\u6362\u6210\u76f8\u540c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5bf9\u4f8b\u4e2d\u53ef\u6539\u5199\u4e3a\uff1a<br \/>\u3000\u3000select * from myTable where cast( myColumnOne as nvarchar(max) ) = 'some value'<br \/>\u3000\u3000\u8f6c\u6362\u7684\u957f\u5ea6\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u6307\u5b9a\uff0c\u6216\u8005\u4f7f\u7528\u6700\u5927\u503cmax\u7531sql\u81ea\u5df1\u5904\u7406\u3002<br \/>\u4e09\uff1a\u4f7f\u7528Like\u5173\u952e\u5b57<br \/>\u3000\u3000like\u5173\u952e\u5b57\u505a\u6761\u4ef6\u67e5\u8be2\u5df2\u7ecf\u5f88\u719f\u6089\uff0c\u5bf9\u4f8b\u4e2d\u8fdb\u884c\u6539\u5199\uff1a<br \/>\u3000\u3000select * from myTable where myColumnOne like 'some value'<br \/>\u56db\uff1aPatindex<br \/>\u3000\u3000\u6b64\u5173\u952e\u5b57\u662f\u5728sql2005\u4e2d\u5f15\u5165\u7684\uff0c\u5728\u6761\u4ef6\u67e5\u8be2\u4e2d\u7528\u4e8e\u6a21\u5f0f\u5339\u914d\uff0c\u5bf9\u4f8b\u4e2d\u6539\u5199\uff1a<br \/>\u3000\u3000select * from myTable where patindex( 'some value', myColumnOne ) &gt; 0<\/p>\n<p>\u53e6\u5916\u67e5\u770b\u4e86\u4e0bmssql\u4e2dtext\/char\/varchar\/ntext\/nchar\/nvarchar\u7684\u533a\u522b(\u4e3b\u8981\u662f\u67e5\u8be2\u65f6\u7684\u6027\u80fd) \u53d1\u73b0\u5982\u4e0b\uff1a<\/p>\n<p>\u5982\u679c\u5e0c\u671b\u5217\u4e2d\u6240\u6709\u6570\u636e\u9879\u7684\u5927\u5c0f\u63a5\u8fd1\u4e00\u81f4\uff0c\u5219\u4f7f\u7528 &nbsp; char\/nchar\u3002nvarchar\/nchar\u6700\u591a\u652f\u63014000\u3002 <br \/>\u5982\u679c\u5e0c\u671b\u5217\u4e2d\u6570\u636e\u9879\u7684\u5927\u5c0f\u5dee\u5f02\u5f88\u5927\uff0c\u5219\u4f7f\u7528 &nbsp; varchar\/nvarchar\u3002varchar\/char\u6700\u591a\u652f\u63018000\u3002 <br \/>\u5982\u679cvarchar\u591f\u7528\u7684\u8bdd\uff0ctext\u6700\u597d\u4e0d\u8981\u7528\uff0c\u67e5\u8be2\u6548\u7387\u4f1a\u5f88\u4f4e\u3002<br \/>'n '\u5f00\u5934\u7684\u662funicode,\u662f\u56fd\u9645\u6807\u51c6,\u652f\u6301\u591a\u56fd\u8bed\u8a00 <br \/>text\u6700\u597d\u4e0d\u7528,\u53ea\u9002\u4e8e\u5b58\u50a8\u5927\u6570\u636e,\u8fd8\u8981\u7528\u4e13\u95e8\u7684\u51fd\u6570\u6765\u8bfb\u5199\u66f4\u65b0\uff0c\u4f46\u662f\u4e5f\u4e0d\u662f\u4efb\u4f55\u65f6\u5019\u90fd\u662f\u548c\u4f7f\u7528\u6587\u672c\u578b\u6570\u636e\uff0c\u56e0\u4e3a\u4ed6\u975e\u5e38\u5360\u7a7a\u95f4\uff0c\u4e5f\u975e\u5e38\u6d88\u8017\u670d\u52a1\u5668\uff0c\u968f\u5904\u4e71\u7528\u540e\u679c\u4e0d\u582a\u8bbe\u60f3\uff01\u56e0\u4e3a\u5373\u4f7f\u4f60\u50cf\u4e00\u4e2a\u6587\u672c\u578b\u5b57\u6bb5\u8f93\u5165\u4e86\u4e00\u4e2a\u7a7a\u503c\u4ed6\u90fd\u4f1a\u5360\u75282K\u7684\u7a7a\u95f4\uff01<\/p>\n<p>OK\uff01\u5c31\u8fd9\u4e48\u591a\u5427\uff01\u8fd9\u4e0b\u53c8\u5b66\u4e60\u4e86\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"\u3000\u3000\u4eca\u5929\u5728\u4fee\u6539\u90d1\u5dde\u5bb6\u653f\u7f51\u7684\u65f6\u5019,\u9047\u5230\u4e00\u4e2a\u5f88\u90c1\u95f7\u7684\u4e8b\u60c5&ldquo;\u4e0d\u80fd\u6bd4\u8f83\u6216\u6392\u5e8f text\u3001ntext \u548c i \u00b7\u00b7\u00b7","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"views":565,"_links":{"self":[{"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/posts\/53"}],"collection":[{"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/comments?post=53"}],"version-history":[{"count":0,"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/posts\/53\/revisions"}],"wp:attachment":[{"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/media?parent=53"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/categories?post=53"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.yyhcw.com\/api\/wp\/v2\/tags?post=53"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}