{"id":5798,"date":"2024-11-14T09:05:32","date_gmt":"2024-11-14T01:05:32","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5798\/"},"modified":"2024-11-14T09:05:32","modified_gmt":"2024-11-14T01:05:32","slug":"mysql%e5%90%8d%e5%ad%97%e7%94%a8%e4%bb%80%e4%b9%88%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5798\/","title":{"rendered":"mysql\u540d\u5b57\u7528\u4ec0\u4e48\u7c7b\u578b"},"content":{"rendered":"<blockquote><p>\n  mysql \u4e2d\u540d\u5b57\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u63a8\u8350\u4f7f\u7528 varchar\u3002\u5b83\u5141\u8bb8\u5b58\u50a8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\uff0c\u5e76\u4e14\u5728\u5b58\u50a8\u6548\u7387\u548c\u7075\u6d3b\u6027\u65b9\u9762\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u5e73\u8861\u3002\u5176\u4ed6\u8003\u8651\u56e0\u7d20\u5305\u62ec\u5927\u5c0f\u5199\u654f\u611f\u6027\u3001\u586b\u5145\u548c\u7d22\u5f15\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/02\/2024060202092118001.jpg\" class=\"aligncenter\" title=\"mysql\u540d\u5b57\u7528\u4ec0\u4e48\u7c7b\u578b\u63d2\u56fe\" alt=\"mysql\u540d\u5b57\u7528\u4ec0\u4e48\u7c7b\u578b\u63d2\u56fe\" \/><\/p>\n<p><strong>MySQL \u4e2d\u540d\u5b57\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u9009\u62e9<\/strong><\/p>\n<p>\u5728 MySQL \u6570\u636e\u5e93\u4e2d\uff0c\u4e3a\u540d\u5b57\u5b57\u6bb5\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u51c6\u786e\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u9009\u9879\uff1a<\/p>\n<p><strong>1. VARCHAR<\/strong><\/p>\n<p>VARCHAR \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002\u5bf9\u4e8e\u540d\u5b57\u5b57\u6bb5\u6765\u8bf4\uff0c\u5b83\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\u5b58\u50a8\u5728\u540c\u4e00\u5217\u4e2d\u3002VARCHAR \u7684\u6700\u5927\u957f\u5ea6\u4e3a 65,535 \u4e2a\u5b57\u7b26\u3002<\/p>\n<p><strong>2. CHAR<\/strong><\/p>\n<p>CHAR \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u5bf9\u4e8e\u5b58\u50a8\u5177\u6709\u56fa\u5b9a\u957f\u5ea6\u7684\u540d\u5b57\uff08\u4f8b\u5982\u59d3\u6c0f\u6216\u7f29\u5199\uff09\u5f88\u6709\u7528\u3002CHAR \u7684\u6700\u5927\u957f\u5ea6\u4e3a 255 \u4e2a\u5b57\u7b26\u3002<\/p>\n<p><strong>3. TEXT<\/strong><\/p>\n<p>TEXT \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u975e\u5e38\u957f\u7684\u5b57\u7b26\u4e32\u3002\u5bf9\u4e8e\u5b58\u50a8\u957f\u7bc7\u6587\u7ae0\u6216\u63cf\u8ff0\u6027\u6587\u672c\uff0c\u5b83\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002TEXT \u7684\u6700\u5927\u957f\u5ea6\u4e3a 65,535 \u4e2a\u5b57\u7b26\u3002<\/p>\n<p><strong>\u63a8\u8350\u9009\u62e9\uff1a<\/strong><\/p>\n<p>\u5bf9\u4e8e\u540d\u5b57\u5b57\u6bb5\uff0c\u63a8\u8350\u4f7f\u7528 <strong>VARCHAR<\/strong> \u7c7b\u578b\u3002\u5b83\u5141\u8bb8\u5b58\u50a8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\uff0c\u5e76\u4e14\u5728\u5b58\u50a8\u6548\u7387\u548c\u7075\u6d3b\u6027\u65b9\u9762\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u5e73\u8861\u3002<\/p>\n<p><strong>\u5176\u4ed6\u8003\u8651\u56e0\u7d20\uff1a<\/strong><\/p>\n<p>\u9664\u4e86\u4e0a\u8ff0\u6570\u636e\u7c7b\u578b\u5916\uff0c\u8fd8\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li> <strong>\u5927\u5c0f\u5199\u654f\u611f\u6027\uff1a<\/strong>VARCHAR \u548c CHAR \u7c7b\u578b\u5bf9\u5927\u5c0f\u5199\u654f\u611f\uff0c\u800c TEXT \u7c7b\u578b\u5219\u4e0d\u654f\u611f\u3002<\/li>\n<li> <strong>\u586b\u5145\uff1a<\/strong>CHAR \u7c7b\u578b\u4f1a\u5728\u5b57\u7b26\u4e32\u540e\u9762\u586b\u5145\u7a7a\u683c\u4ee5\u8fbe\u5230\u6307\u5b9a\u7684\u957f\u5ea6\uff0c\u800c VARCHAR \u4e0d\u4f1a\u3002<\/li>\n<li> <strong>\u7d22\u5f15\uff1a<\/strong>\u5bf9\u4e8e\u9700\u8981\u7ecf\u5e38\u8fdb\u884c\u67e5\u8be2\u7684\u5b57\u6bb5\uff0c\u4f7f\u7528 VARCHAR \u6216 CHAR \u6570\u636e\u7c7b\u578b\u5e76\u521b\u5efa\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u4ed4\u7ec6\u8003\u8651\u8fd9\u4e9b\u56e0\u7d20\uff0c\u60a8\u53ef\u4ee5\u4e3a MySQL \u4e2d\u7684\u540d\u5b57\u5b57\u6bb5\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u540d\u5b57\u7528\u4ec0\u4e48\u7c7b\u578b\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>mysql \u4e2d\u540d\u5b57\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u63a8\u8350\u4f7f\u7528 varchar\u3002\u5b83\u5141\u8bb8\u5b58\u50a8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\uff0c\u5e76\u4e14\u5728\u5b58\u50a8\u6548\u7387\u548c\u7075\u6d3b\u6027\u65b9\u9762\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u5e73\u8861\u3002\u5176\u4ed6\u8003\u8651\u56e0\u7d20\u5305\u62ec\u5927\u5c0f\u5199\u654f\u611f\u6027\u3001\u586b\u5145\u548c\u7d22\u5f15\u3002 MySQL \u4e2d\u540d\u5b57\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u9009\u62e9 \u5728 MySQL \u6570\u636e\u5e93\u4e2d\uff0c\u4e3a\u540d\u5b57\u5b57\u6bb5\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u51c6\u786e\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u9009\u9879\uff1a 1. VARCHAR VARCHAR \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002\u5bf9\u4e8e\u540d\u5b57\u5b57\u6bb5\u6765\u8bf4\uff0c\u5b83\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\u5b58\u50a8\u5728\u540c\u4e00\u5217\u4e2d\u3002VARCHAR \u7684\u6700\u5927\u957f\u5ea6\u4e3a 65,535 \u4e2a\u5b57\u7b26\u3002 2. CHAR CHAR \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u5bf9\u4e8e\u5b58\u50a8\u5177\u6709\u56fa\u5b9a\u957f\u5ea6\u7684\u540d\u5b57\uff08\u4f8b\u5982\u59d3\u6c0f\u6216\u7f29\u5199\uff09\u5f88\u6709\u7528\u3002CHAR \u7684\u6700\u5927\u957f\u5ea6\u4e3a 255 \u4e2a\u5b57\u7b26\u3002 3. TEXT TEXT \u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u975e\u5e38\u957f\u7684\u5b57\u7b26\u4e32\u3002\u5bf9\u4e8e\u5b58\u50a8\u957f\u7bc7\u6587\u7ae0\u6216\u63cf\u8ff0\u6027\u6587\u672c\uff0c\u5b83\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002TEXT \u7684\u6700\u5927\u957f\u5ea6\u4e3a 65,535 \u4e2a\u5b57\u7b26\u3002 \u63a8\u8350\u9009\u62e9\uff1a \u5bf9\u4e8e\u540d\u5b57\u5b57\u6bb5\uff0c\u63a8\u8350\u4f7f\u7528 VARCHAR \u7c7b\u578b\u3002\u5b83\u5141\u8bb8\u5b58\u50a8\u4e0d\u540c\u957f\u5ea6\u7684\u540d\u5b57\uff0c\u5e76\u4e14\u5728\u5b58\u50a8\u6548\u7387\u548c\u7075\u6d3b\u6027\u65b9\u9762\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u5e73\u8861\u3002 \u5176\u4ed6\u8003\u8651\u56e0\u7d20\uff1a \u9664\u4e86\u4e0a\u8ff0\u6570\u636e\u7c7b\u578b\u5916\uff0c\u8fd8\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u56e0\u7d20\uff1a \u5927\u5c0f\u5199\u654f\u611f\u6027\uff1aVARCHAR \u548c CHAR \u7c7b\u578b\u5bf9\u5927\u5c0f\u5199\u654f\u611f\uff0c\u800c TEXT \u7c7b\u578b\u5219\u4e0d\u654f\u611f\u3002 \u586b\u5145\uff1aCHAR \u7c7b\u578b\u4f1a\u5728\u5b57\u7b26\u4e32\u540e\u9762\u586b\u5145\u7a7a\u683c\u4ee5\u8fbe\u5230\u6307\u5b9a\u7684\u957f\u5ea6\uff0c\u800c VARCHAR \u4e0d\u4f1a\u3002 \u7d22\u5f15\uff1a\u5bf9\u4e8e\u9700\u8981\u7ecf\u5e38\u8fdb\u884c\u67e5\u8be2\u7684\u5b57\u6bb5\uff0c\u4f7f\u7528 VARCHAR \u6216 CHAR \u6570\u636e\u7c7b\u578b\u5e76\u521b\u5efa\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002 \u901a\u8fc7\u4ed4\u7ec6\u8003\u8651\u8fd9\u4e9b\u56e0\u7d20\uff0c\u60a8\u53ef\u4ee5\u4e3a MySQL \u4e2d\u7684\u540d\u5b57\u5b57\u6bb5\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002 \u4ee5\u4e0a\u5c31\u662f\u540d\u5b57\u7528\u4ec0\u4e48\u7c7b\u578b\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-5798","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5798","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=5798"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5798\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}