{"id":188296,"date":"2024-11-11T21:29:27","date_gmt":"2024-11-11T13:29:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188296\/"},"modified":"2024-11-11T21:29:27","modified_gmt":"2024-11-11T13:29:27","slug":"%e6%8e%a2%e7%a9%b6char5%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e6%87%89%e7%94%a8%e5%92%8c%e5%84%aa%e5%8b%a2-char5%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188296\/","title":{"rendered":"\u63a2\u7a76char5\u6578\u64da\u5eab\u7684\u61c9\u7528\u548c\u512a\u52e2 (char(5)\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e6%8e%a2%e7%a9%b6char5%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e6%87%89%e7%94%a8%e5%92%8c%e5%84%aa%e5%8b%a2-LqIByvUVRr\">\u63a2\u7a76char(5)\u6578\u64da\u5eab\u7684\u61c9\u7528\u548c\u512a\u52e2<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u7684\u5b58\u5132\u548c\u67e5\u8a62\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002<code>char(5)<\/code>\u662f\u4e00\u7a2e\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u901a\u5e38\u7528\u65bc\u5b58\u5132\u9577\u5ea6\u6046\u5b9a\u7684\u5b57\u7b26\u4e32\u3002\u672c\u6587\u5c07\u63a2\u8a0e<code>char(5)<\/code>\u6578\u64da\u5eab\u7684\u61c9\u7528\u5834\u666f\u53ca\u5176\u512a\u52e2\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afchar5%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%9f-LqIByvUVRr\">\u4ec0\u9ebc\u662fchar(5)\u6578\u64da\u985e\u578b\uff1f<\/h2>\n<p><code>char(5)<\/code>\u662f\u4e00\u7a2e\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u8868\u793a\u6bcf\u500b\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u56fa\u5b9a\u70ba5\u500b\u5b57\u7b26\u3002\u9019\u610f\u5473\u8457\u7121\u8ad6\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u5982\u4f55\uff0c\u6578\u64da\u5eab\u90fd\u6703\u70ba\u6bcf\u500b\u5b57\u7b26\u4e32\u5206\u914d5\u500b\u5b57\u7b26\u7684\u7a7a\u9593\u3002\u5982\u679c\u5b57\u7b26\u4e32\u5c11\u65bc5\u500b\u5b57\u7b26\uff0c\u5247\u6703\u7528\u7a7a\u683c\u586b\u5145\u81f35\u500b\u5b57\u7b26\u3002<\/p>\n<h2 id=\"char5%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-LqIByvUVRr\">char(5)\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<ul>\n<li><strong>\u4ee3\u78bc\u6216\u6a19\u8b58\u7b26\uff1a<\/strong>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u4ee3\u78bc\u6216\u6a19\u8b58\u7b26\u7684\u9577\u5ea6\u662f\u56fa\u5b9a\u7684\u3002\u4f8b\u5982\uff0c\u570b\u5bb6\u4ee3\u78bc\uff08\u5982\u201cUSA\u201d\u3001\u201cCHN\u201d\uff09\u6216\u7522\u54c1\u7de8\u865f\uff08\u5982\u201cP1234\u201d\uff09\u90fd\u53ef\u4ee5\u4f7f\u7528<code>char(5)<\/code>\u4f86\u5b58\u5132\u3002<\/li>\n<li><strong>\u72c0\u614b\u6a19\u8a18\uff1a<\/strong>\u67d0\u4e9b\u7cfb\u7d71\u4e2d\uff0c\u72c0\u614b\u6a19\u8a18\u7684\u9577\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u4f8b\u5982\u201cACTIVE\u201d\u3001\u201cINACT\u201d\u7b49\uff0c\u9019\u4e9b\u90fd\u9069\u5408\u4f7f\u7528<code>char(5)<\/code>\u3002<\/li>\n<li><strong>\u7c21\u77ed\u7684\u5b57\u7b26\u4e32\uff1a<\/strong>\u5c0d\u65bc\u4e00\u4e9b\u7c21\u77ed\u7684\u5b57\u7b26\u4e32\uff0c\u5982\u6027\u5225\uff08\u201cM\u201d\u3001\u201cF\u201d\uff09\u6216\u7b49\u7d1a\uff08\u201cA\u201d\u3001\u201cB\u201d\uff09\uff0c\u4f7f\u7528<code>char(5)<\/code>\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"char5%e7%9a%84%e5%84%aa%e5%8b%a2-LqIByvUVRr\">char(5)\u7684\u512a\u52e2<\/h2>\n<h3 id=\"1-%e6%95%88%e7%8e%87%e9%ab%98-LqIByvUVRr\">1. \u6548\u7387\u9ad8<\/h3>\n<p>\u7531\u65bc<code>char(5)<\/code>\u662f\u56fa\u5b9a\u9577\u5ea6\u7684\u6578\u64da\u985e\u578b\uff0c\u6578\u64da\u5eab\u5728\u5b58\u5132\u548c\u6aa2\u7d22\u6642\u4e0d\u9700\u8981\u8a08\u7b97\u5b57\u7b26\u4e32\u7684\u5be6\u969b\u9577\u5ea6\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u9019\u7a2e\u6548\u7387\u7684\u63d0\u5347\u662f\u986f\u8457\u7684\u3002<\/p>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e4%b8%80%e8%87%b4%e6%80%a7-LqIByvUVRr\">2. \u6578\u64da\u4e00\u81f4\u6027<\/h3>\n<p>\u4f7f\u7528\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u985e\u578b\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u6240\u6709\u5b58\u5132\u7684\u6578\u64da\u90fd\u5c07\u5177\u6709\u76f8\u540c\u7684\u9577\u5ea6\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<h3 id=\"3-%e7%b0%a1%e5%8c%96%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86-LqIByvUVRr\">3. \u7c21\u5316\u6578\u64da\u8655\u7406<\/h3>\n<p>\u5728\u9032\u884c\u6578\u64da\u8655\u7406\u6642\uff0c\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u53ef\u4ee5\u7c21\u5316\u8a31\u591a\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u5728\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u6642\uff0c\u7121\u9700\u8003\u616e\u4e0d\u540c\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u9019\u6a23\u53ef\u4ee5\u7c21\u5316\u4ee3\u78bc\u908f\u8f2f\u3002<\/p>\n<h3 id=\"4-%e7%af%80%e7%9c%81%e5%ad%98%e5%84%b2%e7%a9%ba%e9%96%93-LqIByvUVRr\">4. \u7bc0\u7701\u5b58\u5132\u7a7a\u9593<\/h3>\n<p>\u96d6\u7136<code>char(5)<\/code>\u6703\u70ba\u6bcf\u500b\u5b57\u7b26\u4e32\u5206\u914d\u56fa\u5b9a\u7684\u7a7a\u9593\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u985e\u578b\u53ef\u4ee5\u6bd4\u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u985e\u578b\uff08\u5982<code>varchar<\/code>\uff09\u66f4\u6709\u6548\u5730\u5229\u7528\u5b58\u5132\u7a7a\u9593\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u9577\u5ea6\u76f8\u5c0d\u4e00\u81f4\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-LqIByvUVRr\">\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528<code>char(5)<\/code>\u7684\u7c21\u55ae\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728SQL\u4e2d\u5275\u5efa\u4e00\u500b\u8868\u4e26\u63d2\u5165\u6578\u64da\uff1a<\/p>\n<pre><code>CREATE TABLE products (\n    product_id INT PRIMARY KEY,\n    product_code CHAR(5) NOT NULL,\n    product_name VARCHAR(100)\n);\n\nINSERT INTO products (product_id, product_code, product_name) VALUES\n(1, 'P1234', 'Product A'),\n(2, 'P5678', 'Product B');\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>product_code<\/code>\u5b57\u6bb5\u4f7f\u7528\u4e86<code>char(5)<\/code>\uff0c\u78ba\u4fdd\u6240\u6709\u7522\u54c1\u4ee3\u78bc\u7684\u9577\u5ea6\u90fd\u662f5\u500b\u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-LqIByvUVRr\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0c<code>char(5)<\/code>\u6578\u64da\u985e\u578b\u5728\u7279\u5b9a\u61c9\u7528\u5834\u666f\u4e2d\u5177\u6709\u660e\u986f\u7684\u512a\u52e2\uff0c\u5305\u62ec\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u3001\u4e00\u81f4\u7684\u6578\u64da\u683c\u5f0f\u4ee5\u53ca\u7c21\u5316\u7684\u6578\u64da\u7ba1\u7406\u3002\u5c0d\u65bc\u9700\u8981\u56fa\u5b9a\u9577\u5ea6\u5b57\u7b26\u4e32\u7684\u61c9\u7528\uff0c<code>char(5)<\/code>\u662f\u4e00\u500b\u7406\u60f3\u7684\u9078\u64c7\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u5176\u4ed6\u9700\u6c42\uff0c<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22char(5)\u6578\u64da\u5eab\u7684\u61c9\u7528\u8207\u512a\u52e2\uff0c\u4e86\u89e3\u5176\u5728\u6578\u64da\u5b58\u5132\u3001\u67e5\u8a62\u6548\u7387\u53ca\u7a7a\u9593\u7bc0\u7701\u65b9\u9762\u7684\u7368\u7279\u7279\u9ede\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-188296","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188296","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=188296"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188296\/revisions"}],"predecessor-version":[{"id":188297,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188296\/revisions\/188297"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}