{"id":160077,"date":"2024-11-03T20:05:21","date_gmt":"2024-11-03T12:05:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160077\/"},"modified":"2024-11-03T20:05:23","modified_gmt":"2024-11-03T12:05:23","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160077\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase CHAR \u6578\u64da\u985e\u578b"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-WJlvJLvYpT\">OceanBase \u6559\u7a0b\uff1aOceanBase CHAR \u6578\u64da\u985e\u578b<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u8d8a\u4f86\u8d8a\u53d7\u5230\u958b\u767c\u8005\u548c\u4f01\u696d\u7684\u9752\u775e\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e OceanBase \u4e2d\u7684 CHAR \u6578\u64da\u985e\u578b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u7279\u6027\u53ca\u4f7f\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%9f-WJlvJLvYpT\">\u4ec0\u9ebc\u662f CHAR \u6578\u64da\u985e\u578b\uff1f<\/h2>\n<p>CHAR \u6578\u64da\u985e\u578b\u662f\u4e00\u7a2e\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u6578\u64da\u985e\u578b\u3002\u5728 OceanBase \u4e2d\uff0cCHAR \u985e\u578b\u7684\u5b57\u6bb5\u9577\u5ea6\u53ef\u4ee5\u5f9e 0 \u5230 255 \u5b57\u7b26\u3002\u7576\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u5c0f\u65bc\u5b9a\u7fa9\u7684\u9577\u5ea6\u6642\uff0c\u7cfb\u7d71\u6703\u81ea\u52d5\u7528\u7a7a\u683c\u586b\u5145\u81f3\u6307\u5b9a\u9577\u5ea6\u3002<\/p>\n<h2 id=\"char-%e8%88%87-varchar-%e7%9a%84%e5%8d%80%e5%88%a5-WJlvJLvYpT\">CHAR \u8207 VARCHAR \u7684\u5340\u5225<\/h2>\n<p>\u5728 OceanBase \u4e2d\uff0cCHAR \u548c VARCHAR \u90fd\u662f\u7528\u4f86\u5b58\u5132\u5b57\u7b26\u4e32\u7684\u6578\u64da\u985e\u578b\uff0c\u4f46\u5b83\u5011\u4e4b\u9593\u6709\u4e00\u4e9b\u91cd\u8981\u7684\u5340\u5225\uff1a<\/p>\n<ul>\n<li><strong>\u9577\u5ea6\uff1a<\/strong>CHAR \u662f\u56fa\u5b9a\u9577\u5ea6\uff0c\u800c VARCHAR \u662f\u53ef\u8b8a\u9577\u5ea6\u3002\u9019\u610f\u5473\u8457 CHAR \u5728\u5b58\u5132\u6642\u6703\u59cb\u7d42\u4f54\u7528\u5b9a\u7fa9\u7684\u7a7a\u9593\uff0c\u800c VARCHAR \u53ea\u4f54\u7528\u5be6\u969b\u4f7f\u7528\u7684\u7a7a\u9593\u3002<\/li>\n<li><strong>\u6027\u80fd\uff1a<\/strong>\u7531\u65bc CHAR \u7684\u56fa\u5b9a\u9577\u5ea6\u7279\u6027\uff0c\u5c0d\u65bc\u7d93\u5e38\u9032\u884c\u67e5\u8a62\u7684\u5b57\u6bb5\uff0c\u4f7f\u7528 CHAR \u53ef\u80fd\u6703\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u70ba\u6578\u64da\u7684\u5b58\u53d6\u4f4d\u7f6e\u662f\u56fa\u5b9a\u7684\u3002<\/li>\n<li><strong>\u5b58\u5132\u7a7a\u9593\uff1a<\/strong>\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u8b8a\u5316\u4e0d\u5927\uff0c\u4f7f\u7528 CHAR \u53ef\u80fd\u6703\u6d6a\u8cbb\u7a7a\u9593\uff1b\u800c\u5c0d\u65bc\u9577\u5ea6\u8b8a\u5316\u8f03\u5927\u7684\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528 VARCHAR \u66f4\u70ba\u5408\u9069\u3002<\/li>\n<\/ul>\n<h2 id=\"char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-WJlvJLvYpT\">CHAR \u6578\u64da\u985e\u578b\u7684\u4f7f\u7528\u5834\u666f<\/h2>\n<p>\u5728\u9078\u64c7\u4f7f\u7528 CHAR \u6578\u64da\u985e\u578b\u6642\uff0c\u958b\u767c\u8005\u61c9\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u56fa\u5b9a\u9577\u5ea6\u7684\u4ee3\u78bc\uff1a<\/strong>\u4f8b\u5982\uff0c\u570b\u5bb6\u4ee3\u78bc\u3001\u90f5\u653f\u7de8\u78bc\u7b49\uff0c\u9019\u4e9b\u6578\u64da\u7684\u9577\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u4f7f\u7528 CHAR \u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u6027\u80fd\u8981\u6c42\u9ad8\u7684\u61c9\u7528\uff1a<\/strong>\u5728\u9700\u8981\u9ad8\u6027\u80fd\u7684\u61c9\u7528\u4e2d\uff0c\u4f7f\u7528 CHAR \u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u5b58\u53d6\u7684\u6642\u9593\uff0c\u56e0\u70ba\u6578\u64da\u7684\u5b58\u53d6\u4f4d\u7f6e\u662f\u56fa\u5b9a\u7684\u3002<\/li>\n<li><strong>\u9700\u8981\u586b\u5145\u7684\u5b57\u7b26\u4e32\uff1a<\/strong>\u5982\u679c\u9700\u8981\u5728\u5b57\u7b26\u4e32\u5f8c\u9762\u586b\u5145\u7a7a\u683c\u4ee5\u7b26\u5408\u67d0\u7a2e\u683c\u5f0f\uff0c\u4f7f\u7528 CHAR \u6703\u66f4\u65b9\u4fbf\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-oceanbase-%e4%b8%ad%e4%bd%bf%e7%94%a8-char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-WJlvJLvYpT\">\u5982\u4f55\u5728 OceanBase \u4e2d\u4f7f\u7528 CHAR \u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728 OceanBase \u4e2d\u5275\u5efa\u4e00\u500b\u4f7f\u7528 CHAR \u6578\u64da\u985e\u578b\u7684\u8868\u683c\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE TABLE example_table (\n    id INT PRIMARY KEY,\n    country_code CHAR(3),\n    postal_code CHAR(6)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>example_table<\/code> \u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b\u6574\u6578\u578b\u7684\u4e3b\u9375 <code>id<\/code>\uff0c\u4ee5\u53ca\u5169\u500b CHAR \u985e\u578b\u7684\u5b57\u6bb5 <code>country_code<\/code> \u548c <code>postal_code<\/code>\u3002<\/p>\n<h2 id=\"char-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-WJlvJLvYpT\">CHAR \u6578\u64da\u985e\u578b\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 CHAR \u6578\u64da\u985e\u578b\u6642\uff0c\u958b\u767c\u8005\u61c9\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>CHAR \u985e\u578b\u7684\u5b57\u6bb5\u5728\u5b58\u5132\u6642\u6703\u81ea\u52d5\u586b\u5145\u7a7a\u683c\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u5b57\u7b26\u4e32\u7684\u6bd4\u8f03\u64cd\u4f5c\u3002<\/li>\n<li>\u5728\u9032\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c\u6642\uff0c\u9700\u8003\u616e\u5230 CHAR \u7684\u56fa\u5b9a\u9577\u5ea6\u7279\u6027\uff0c\u907f\u514d\u56e0\u70ba\u7a7a\u683c\u586b\u5145\u800c\u5c0e\u81f4\u7684\u610f\u5916\u7d50\u679c\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WJlvJLvYpT\">\u7e3d\u7d50<\/h2>\n<p>OceanBase \u7684 CHAR \u6578\u64da\u985e\u578b\u5728\u8655\u7406\u56fa\u5b9a\u9577\u5ea6\u5b57\u7b26\u4e32\u6642\u5177\u6709\u660e\u986f\u7684\u512a\u52e2\uff0c\u7279\u5225\u662f\u5728\u6027\u80fd\u8981\u6c42\u9ad8\u7684\u61c9\u7528\u5834\u666f\u4e2d\u3002\u4e86\u89e3 CHAR \u8207\u5176\u4ed6\u6578\u64da\u985e\u578b\u7684\u5340\u5225\uff0c\u4ee5\u53ca\u5176\u9069\u7528\u7684\u5834\u666f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u3002\u82e5\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u670d\u52d9\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 OceanBase CHAR 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