{"id":200209,"date":"2025-05-06T12:30:15","date_gmt":"2025-05-06T04:30:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200209\/"},"modified":"2025-05-06T12:30:15","modified_gmt":"2025-05-06T04:30:15","slug":"%e8%be%be%e6%a2%a6%e6%95%b0%e6%8d%ae%e5%ba%93-varchar-%e5%ad%97%e6%ae%b5%e5%ad%98%e5%82%a8%e9%95%bf%e5%ba%a6%ef%bc%9a%e5%a6%82%e4%bd%95%e7%a1%ae%e4%bf%9d%e5%a7%8b%e7%bb%88%e5%ad%98%e5%82%a8-10","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200209\/","title":{"rendered":"\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u5b57\u6bb5\u5b58\u50a8\u957f\u5ea6\uff1a\u5982\u4f55\u786e\u4fdd\u59cb\u7ec8\u5b58\u50a8 10 \u4e2a\u5b57\u7b26\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u5b57\u6bb5\u5b58\u50a8\u957f\u5ea6\uff1a\u5982\u4f55\u786e\u4fdd\u59cb\u7ec8\u5b58\u50a8 10 \u4e2a\u5b57\u7b26\uff1f<\/h1>\n<p>\u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6570\u636e\u5e93\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300a\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u5b57\u6bb5\u5b58\u50a8\u957f\u5ea6\uff1a\u5982\u4f55\u786e\u4fdd\u59cb\u7ec8\u5b58\u50a8 10 \u4e2a\u5b57\u7b26\uff1f\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241028\/1730109823671f617f1eb2f.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u8fbe\u68a6\u6570\u636e\u5e93\u4e2d VARCHAR \u5b57\u6bb5\u5b58\u50a8\u957f\u5ea6\u7591\u60d1<\/strong><\/p>\n<p>\u9488\u5bf9\u5728\u8fbe\u68a6\u6570\u636e\u5e93\u4e2d\u4f7f\u7528 VARCHAR \u7c7b\u578b\u5b57\u6bb5\u5b58\u50a8\u5b57\u7b26\u65f6\u9047\u5230\u7684\u95ee\u9898\uff0c\u8bf7\u5bfb\u6c42\u89e3\u51b3\u4e4b\u9053\u3002<\/p>\n<p><strong>\u95ee\u9898\u63cf\u8ff0<\/strong><\/p>\n<p>\u5728\u8fbe\u68a6\u6570\u636e\u5e93\u4e2d\u4f7f\u7528 VARCHAR \u7c7b\u578b\u5b57\u6bb5\u65f6\uff0c\u53d1\u73b0\u5176\u5b58\u50a8\u5b57\u7b26\u7684\u957f\u5ea6\u53d7\u5b57\u7b26\u96c6\u7f16\u7801\uff08CHARSET\uff09\u548c\u662f\u5426\u4ee5\u5b57\u8282\u5b58\u50a8\uff08LENGTH_IN_CHAR\uff09\u8fd9\u4e24\u4e2a\u53c2\u6570\u7684\u5f71\u54cd\u3002<\/p>\n<p><strong>\u95ee\u9898\u8868\u73b0\uff1a<\/strong><\/p>\n<ul>\n<li>\u5f53\u4f7f\u7528 UTF-8 \u5b57\u7b26\u96c6\u7f16\u7801\u4e14\u4ee5\u5b57\u8282\u5b58\u50a8\u65f6\uff0c\u4e00\u4e2a\u957f\u5ea6\u4e3a 10 \u7684 VARCHAR \u5b57\u6bb5\u5b9e\u9645\u4e0a\u53ea\u80fd\u5b58\u50a8 3 \u4e2a\u4e2d\u6587\u5b57\u7b26\u6216 10 \u4e2a\u82f1\u6587\u5b57\u7b26\u3002<\/li>\n<li>\u5982\u679c\u5c06 LENGTH_IN_CHAR \u53c2\u6570\u8bbe\u7f6e\u4e3a 1\uff08\u4ee5\u5b57\u7b26\u5b58\u50a8\uff09\uff0c\u5219\u53ef\u4ee5\u5b58\u50a8 13.3 \u4e2a\u4e2d\u6587\u5b57\u7b26\u6216 40 \u4e2a\u82f1\u6587\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<p><strong>\u76ee\u6807\uff1a<\/strong><\/p>\n<p>\u4e0d\u7ba1\u4f7f\u7528\u54ea\u79cd\u5b57\u7b26\u96c6\u6216\u5b58\u50a8\u65b9\u5f0f\uff0c\u90fd\u9700\u8981\u786e\u4fdd VARCHAR \u5b57\u6bb5\u59cb\u7ec8\u80fd\u5b58\u50a8 10 \u4e2a\u5b57\u7b26\uff0c\u65e0\u8bba\u8fd9\u4e9b\u5b57\u7b26\u662f\u4e2d\u6587\u8fd8\u662f\u82f1\u6587\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<ol>\n<li><strong>\u4f7f\u7528 CHAR \u7c7b\u578b\u5b57\u6bb5\uff1a<\/strong>CHAR \u7c7b\u578b\u5b57\u6bb5\u7684\u957f\u5ea6\u662f\u4ee5\u5b57\u7b26\u4e3a\u5355\u4f4d\u56fa\u5b9a\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u786e\u4fdd\u59cb\u7ec8\u5b58\u50a8 10 \u4e2a\u5b57\u7b26\uff0c\u800c\u4e0d\u4f1a\u53d7\u5b57\u7b26\u96c6\u7f16\u7801\u6216\u5b58\u50a8\u65b9\u5f0f\u7684\u5f71\u54cd\u3002<\/li>\n<li><strong>\u5728\u521b\u5efa VARCHAR \u5b57\u6bb5\u65f6\u6307\u5b9a BYTES \u957f\u5ea6\uff1a<\/strong>\u901a\u8fc7\u5728\u521b\u5efa VARCHAR \u5b57\u6bb5\u65f6\u6307\u5b9a BYTES \u957f\u5ea6\uff0c\u53ef\u4ee5\u786e\u4fdd\u5b57\u6bb5\u59cb\u7ec8\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u5b58\u50a8\uff0c\u4ece\u800c\u907f\u514d\u56e0\u5b57\u7b26\u96c6\u7f16\u7801\u4e0d\u540c\u800c\u5bfc\u81f4\u5b58\u50a8\u957f\u5ea6\u5dee\u5f02\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u521b\u5efa VARCHAR(10 BYTES) \u5b57\u6bb5\u3002<\/li>\n<li><strong>\u4f7f\u7528 CAST \u51fd\u6570\u8fdb\u884c\u8f6c\u6362\uff1a<\/strong>\u53ef\u4ee5\u5728\u63d2\u5165\u6570\u636e\u65f6\u4f7f\u7528 CAST \u51fd\u6570\u5c06\u5b57\u7b26\u578b\u6570\u636e\u663e\u5f0f\u8f6c\u6362\u4e3a\u5b57\u8282\u578b\u6570\u636e\uff0c\u4ece\u800c\u786e\u4fdd\u5b58\u50a8\u957f\u5ea6\u4e0d\u53d7\u5b57\u7b26\u96c6\u7f16\u7801\u7684\u5f71\u54cd\u3002\u4f8b\u5982\uff0cINSERT INTO table (field) VALUES (CAST(&#8217;10 characters&#8217; 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