{"id":864,"date":"2016-08-04T10:15:01","date_gmt":"2016-08-04T02:15:01","guid":{"rendered":"http:\/\/www.oracle.name\/?p=864"},"modified":"2016-08-04T10:15:01","modified_gmt":"2016-08-04T02:15:01","slug":"nvarchar-%e5%92%8cvarchar%e5%8c%ba%e5%88%ab%e5%92%8c%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.llku.com\/?p=864","title":{"rendered":"NVARCHAR \u548cVARCHAR\u533a\u522b\u548c\u4f7f\u7528"},"content":{"rendered":"

\n\t1\u3001\u5404\u81ea\u7684\u5b9a\u4e49\uff1a\n<\/p>\n

\n\t       \u25ba nvarchar(n):\u5305\u542bn\u4e2a\u5b57\u7b26\u7684\u53ef\u53d8\u957f\u5ea6Unicode\u5b57\u7b26\u6570\u636e\u3002n\u7684\u503c\u5fc5\u987b\u4ecb\u4e8e1\u4e0e4,000\u4e4b\u95f4\u3002\u5b57\u8282\u7684\u5b58\u50a8\u5927\u5c0f\u662f\u6240\u8f93\u5165\u5b57\u7b26\u4e2a\u6570\u7684\u4e24\u500d\u3002\u6240\u8f93\u5165\u7684\u6570\u636e\u5b57\u7b26\u957f\u5ea6\u53ef\u4ee5\u4e3a\u96f6\u3002 \n<\/p>\n

\n\t       \u25ba varchar[(n)]:\u957f\u5ea6\u4e3an\u4e2a\u5b57\u8282\u7684\u53ef\u53d8\u957f\u5ea6\u4e14\u975eUnicode\u7684\u5b57\u7b26\u6570\u636e\u3002n \u5fc5\u987b\u662f\u4e00\u4e2a\u4ecb\u4e8e1\u548c8,000\u4e4b\u95f4\u7684\u6570\u503c\u3002\u5b58\u50a8\u5927\u5c0f\u4e3a\u8f93\u5165\u6570\u636e\u7684\u5b57\u8282\u7684\u5b9e\u9645\u957f\u5ea6\uff0c\u800c\u4e0d\u662fn\u4e2a\u5b57\u8282\u3002\u6240\u8f93\u5165\u7684\u6570\u636e\u5b57\u7b26\u957f\u5ea6\u53ef\u4ee5\u4e3a\u96f6\u3002\n<\/p>\n

\n\tvarchar(max)\u6700\u59272gb\u5b57\u7b26 \u4f7f\u7528C#\u4e2d\u7684DbType.varchar\u9488\u5bf9max DbType.varchar,-1\n<\/p>\n

\n\t2\u3001\u533a\u522b\uff1a\n<\/p>\n

\n\t      \u25ba \u4ece\u5b58\u50a8\u65b9\u5f0f\u4e0a,nvarchar\u662f\u6309\u5b57\u7b26\u5b58\u50a8\u7684,\u800c varchar\u662f\u6309\u5b57\u8282\u5b58\u50a8\u7684\uff1b\n<\/p>\n

\n\t      \u25ba \u4ece\u5b58\u50a8\u91cf\u4e0a\u8003\u8651,varchar\u6bd4\u8f83\u8282\u7701\u7a7a\u95f4,\u56e0\u4e3a\u5b58\u50a8\u5927\u5c0f\u4e3a\u5b57\u8282\u7684\u5b9e\u9645\u957f\u5ea6\uff0c\u800c nvarchar\u662f\u53cc\u5b57\u8282\u5b58\u50a8\uff1b\n<\/p>\n

\n\t      \u25ba \u5728\u4f7f\u7528\u4e0a\uff0c\u5982\u679c\u5b58\u50a8\u5185\u5bb9\u90fd\u662f\u82f1\u6587\u5b57\u7b26\u800c\u6ca1\u6709\u6c49\u5b57\u7b49\u5176\u4ed6\u8bed\u8a00\u7b26\u53f7\uff0c\u5efa\u8bae\u4f7f\u7528varchar\uff1b\u542b\u6709\u6c49\u5b57\u7684\u4f7f\u7528nvarchar\uff0c\u56e0\u4e3anvarchar\u662f\u4f7f\u7528Unicode\u7f16\u7801\uff0c\u5373\u7edf\u4e00\u7684\u5b57\u7b26\u7f16\u7801\u6807\u51c6\uff0c\u4f1a\u51cf\u5c11\u4e71\u7801\u7684\u51fa\u73b0\u51e0\u7387\uff1b\n<\/p>\n

\n\t      \u25ba\u5982\u679c\u4f60\u505a\u7684\u9879\u76ee\u53ef\u80fd\u6d89\u53ca\u4e0d\u540c\u8bed\u8a00\u4e4b\u95f4\u7684\u8f6c\u6362\uff0c\u5efa\u8bae\u7528nvarchar\u3002\n<\/p>\n

\n\t\u8fd9\u70b9\u8981\u6ce8\u610f\uff1avarchar\u9002\u5408\u4e0e\u5b58\u50a8\u82f1\u6587\u548c\u6570\u5b57\uff1bnvarchr\u4e00\u822c\u7528\u4e8e\u5b58\u50a8\u4e2d\u6587\u6216\u5176\u4ed6\u8bed\u8a00\u7684\u8f93\u5165\uff0c\u56e0\u4e3a\u8fd9\u6837\uff0c\u53ef\u4ee5\u9632\u6b62\u5230\u5176\u4ed6\u8bed\u8a00\u5e73\u53f0\u4e0a\u51fa\u73b0\u4e71\u7801\u7684\u95ee\u9898\u3002\n<\/p>\n

\n\t\u4e3e\u4e2a\u4f8b\u5b50\uff1a 
\n\tcreate table a (name1 varchar(8)) 
\n\tinsert a select '\u5f20\u7ea2a' 
\n\t–\u5b58\u50a8\u957f\u5ea6\u4e3a5\u4e2a\u5b57\u8282 
\n\tinsert a select '\u738b\u4e00\u5357' 
\n\t–\u5b58\u50a8\u957f\u5ea6\u4e3a6\u4e2a\u5b57\u8282\n<\/p>\n

\n\t–\u610f\u601d\u662fvarchar\u53d8\u957f\u5b57\u7b26\u6570\u636e\u7c7b\u578b\u4e0e\u5b58\u50a8\u6570\u636e\u7684\u5b9e\u9645\u957f\u5ea6\u662f\u4e00\u81f4\u7684 \n<\/p>\n

\n\tnvarchar(n):\u53ef\u53d8\u957f\u5ea6 Unicode \u6570\u636e\uff0c\u5176\u6700\u5927\u957f\u5ea6\u4e3a 4,000 \u5b57\u7b26\u3002 
\n\t\u5b57\u8282\u7684\u5b58\u50a8\u5927\u5c0f\u662f\u6240\u8f93\u5165\u5b57\u7b26\u4e2a\u6570\u7684\u4e24\u500d\uff0c 
\n\t\u5c31\u662f\u8bf4\u5b83\u662f\u53cc\u5b57\u8282\u6765\u5b58\u50a8\u6570\u636e\u7684\u3002 
\n\t\u5982\u679c\u5b58\u50a8\u6570\u636e\u5982\u679c\u5b58\u5728\u5355\u5b57\u8282\u65f6\uff0c\u5b83\u4e5f\u662f\u4ee5\u53cc\u5b57\u8282\u6765\u5360\u7528\u5b58\u50a8\u7a7a\u95f4\u7684\u3002 \n<\/p>\n

\n\t\u4e3e\u4e2a\u4f8b\u5b50\uff1a 
\n\tcreate table aa (name1 nvarchar(8)) 
\n\tinsert aa select '\u5f20\u7ea2a' 
\n\t–\u5b58\u50a8\u957f\u5ea6\u4e3a6\u4e2a\u5b57\u8282\n<\/p>\n

\n\t\u6458\u81ea\uff1ahttp:\/\/blog.csdn.net\/feixianxxx\/article\/details\/4454659<\/p>\n","protected":false},"excerpt":{"rendered":"

1\u3001\u5404\u81ea\u7684\u5b9a\u4e49\uff1a        \u25ba nvarchar(n):\u5305\u542bn\u4e2a\u5b57 … \u7ee7\u7eed\u9605\u8bfbNVARCHAR \u548cVARCHAR\u533a\u522b\u548c\u4f7f\u7528<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[68],"tags":[],"_links":{"self":[{"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/posts\/864"}],"collection":[{"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.llku.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=864"}],"version-history":[{"count":1,"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/posts\/864\/revisions"}],"predecessor-version":[{"id":865,"href":"https:\/\/www.llku.com\/index.php?rest_route=\/wp\/v2\/posts\/864\/revisions\/865"}],"wp:attachment":[{"href":"https:\/\/www.llku.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.llku.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.llku.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}