{"id":6890,"date":"2024-11-14T12:45:05","date_gmt":"2024-11-14T04:45:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6890\/"},"modified":"2024-11-14T12:45:05","modified_gmt":"2024-11-14T04:45:05","slug":"%e8%be%be%e6%a2%a6%e6%95%b0%e6%8d%ae%e5%ba%93-varchar-%e7%b1%bb%e5%9e%8b%e5%ad%98%e5%82%a8%e9%95%bf%e5%ba%a6%ef%bc%9a%e4%b8%ad%e8%8b%b1%e6%96%87%e5%a6%82%e4%bd%95%e7%bb%9f%e4%b8%80%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6890\/","title":{"rendered":"\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\uff1a\u4e2d\u82f1\u6587\u5982\u4f55\u7edf\u4e00\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173002104352470.jpg\" class=\"aligncenter\" title=\"\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\uff1a\u4e2d\u82f1\u6587\u5982\u4f55\u7edf\u4e00\uff1f\u63d2\u56fe\" alt=\"\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\uff1a\u4e2d\u82f1\u6587\u5982\u4f55\u7edf\u4e00\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>VARCHAR \u7c7b\u578b\u5728\u5b57\u7b26\u5b58\u50a8\u957f\u5ea6\u4e0a\u7684\u56f0\u6270<\/strong><\/p>\n<p>\u8fd1\u671f\u5728\u4f7f\u7528\u8fbe\u68a6\u6570\u636e\u5e93\u65f6\uff0c\u9047\u5230\u4e86\u4e00\u4e2a\u6709\u5173 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\u7684\u95ee\u9898\u3002\u8be5\u7c7b\u578b\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u5b58\u50a8\u957f\u5ea6\u53d7\u5b57\u7b26\u96c6\u548c LENGTH_IN_CHAR \u53c2\u6570\u7684\u5f71\u54cd\uff1a<\/p>\n<ul>\n<li> <strong>\u5b57\u7b26\u96c6\uff1a<\/strong>UTF-8 \u7f16\u7801\u65f6\uff0c\u4e2d\u6587\u5360 3 \u4e2a\u5b57\u8282\uff0c\u82f1\u6587\u5360 1 \u5b57\u8282\u3002<\/li>\n<li> <strong>LENGTH_IN_CHAR\uff1a<\/strong>\u4e3a 0 \u65f6\u4ee5\u5b57\u8282\u5b58\u50a8\uff0c\u4e3a 1 \u65f6\u4ee5\u5b57\u7b26\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u5b57\u8282\u5b58\u50a8\u7684 VARCHAR(10) \u5b57\u6bb5\uff0c\u5728 UTF-8 \u4e0b\u53ea\u80fd\u5b58\u50a8 3 \u4e2a\u4e2d\u6587\u6216 10 \u4e2a\u82f1\u6587\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p>\u8be5\u95ee\u9898\u6e90\u4e8e\u5b57\u7b26\u96c6\u4e0e LENGTH_IN_CHAR \u8bbe\u7f6e\u7684\u4e0d\u4e00\u81f4\u3002\u4ee5\u4e0b\u6b65\u9aa4\u53ef\u5c06\u5b57\u7b26\u4e32\u957f\u5ea6\u7edf\u4e00\u4e3a 10 \u4e2a\u5b57\u7b26\uff08\u65e0\u8bba\u4e2d\u82f1\u6587\uff09\uff1a<\/p>\n<ul>\n<li>\u5c06\u5b57\u7b26\u96c6\u8bbe\u4e3a\u5355\u5b57\u8282\u7f16\u7801\uff0c\u5982 ASCII \u6216 Latin1\u3002<\/li>\n<li>\u5c06 LENGTH_IN_CHAR \u8bbe\u4e3a 1\uff0c\u4ee5\u5b57\u7b26\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<p>\u6b64\u65f6\uff0cVARCHAR(10) \u5b57\u6bb5\u65e0\u8bba\u5b58\u50a8\u4e2d\u82f1\u6587\u90fd\u53ea\u80fd\u5bb9\u7eb3 10 \u4e2a\u5b57\u7b26\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\uff1a\u4e2d\u82f1\u6587\u5982\u4f55\u7edf\u4e00\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VARCHAR \u7c7b\u578b\u5728\u5b57\u7b26\u5b58\u50a8\u957f\u5ea6\u4e0a\u7684\u56f0\u6270 \u8fd1\u671f\u5728\u4f7f\u7528\u8fbe\u68a6\u6570\u636e\u5e93\u65f6\uff0c\u9047\u5230\u4e86\u4e00\u4e2a\u6709\u5173 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\u7684\u95ee\u9898\u3002\u8be5\u7c7b\u578b\u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u5b58\u50a8\u957f\u5ea6\u53d7\u5b57\u7b26\u96c6\u548c LENGTH_IN_CHAR \u53c2\u6570\u7684\u5f71\u54cd\uff1a \u5b57\u7b26\u96c6\uff1aUTF-8 \u7f16\u7801\u65f6\uff0c\u4e2d\u6587\u5360 3 \u4e2a\u5b57\u8282\uff0c\u82f1\u6587\u5360 1 \u5b57\u8282\u3002 LENGTH_IN_CHAR\uff1a\u4e3a 0 \u65f6\u4ee5\u5b57\u8282\u5b58\u50a8\uff0c\u4e3a 1 \u65f6\u4ee5\u5b57\u7b26\u5b58\u50a8\u3002 \u4f8b\u5982\uff0c\u4ee5\u5b57\u8282\u5b58\u50a8\u7684 VARCHAR(10) \u5b57\u6bb5\uff0c\u5728 UTF-8 \u4e0b\u53ea\u80fd\u5b58\u50a8 3 \u4e2a\u4e2d\u6587\u6216 10 \u4e2a\u82f1\u6587\u3002 \u89e3\u51b3\u65b9\u6cd5\uff1a \u8be5\u95ee\u9898\u6e90\u4e8e\u5b57\u7b26\u96c6\u4e0e LENGTH_IN_CHAR \u8bbe\u7f6e\u7684\u4e0d\u4e00\u81f4\u3002\u4ee5\u4e0b\u6b65\u9aa4\u53ef\u5c06\u5b57\u7b26\u4e32\u957f\u5ea6\u7edf\u4e00\u4e3a 10 \u4e2a\u5b57\u7b26\uff08\u65e0\u8bba\u4e2d\u82f1\u6587\uff09\uff1a \u5c06\u5b57\u7b26\u96c6\u8bbe\u4e3a\u5355\u5b57\u8282\u7f16\u7801\uff0c\u5982 ASCII \u6216 Latin1\u3002 \u5c06 LENGTH_IN_CHAR \u8bbe\u4e3a 1\uff0c\u4ee5\u5b57\u7b26\u5b58\u50a8\u3002 \u6b64\u65f6\uff0cVARCHAR(10) \u5b57\u6bb5\u65e0\u8bba\u5b58\u50a8\u4e2d\u82f1\u6587\u90fd\u53ea\u80fd\u5bb9\u7eb3 10 \u4e2a\u5b57\u7b26\u3002 \u4ee5\u4e0a\u5c31\u662f\u8fbe\u68a6\u6570\u636e\u5e93 VARCHAR \u7c7b\u578b\u5b58\u50a8\u957f\u5ea6\uff1a\u4e2d\u82f1\u6587\u5982\u4f55\u7edf\u4e00\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6890","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6890","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6890"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6890\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}