{"id":188138,"date":"2024-11-11T20:07:21","date_gmt":"2024-11-11T12:07:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188138\/"},"modified":"2024-11-11T20:07:22","modified_gmt":"2024-11-11T12:07:22","slug":"%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e5%ba%ab%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7-%e6%80%8e%e9%ba%bc%e7%af%a9%e9%81%b8%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e7%9a%84%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188138\/","title":{"rendered":"\u56db\u500b\u5b57\u7b26\u6578\u64da\u5eab\u7be9\u9078\u6280\u5de7 (\u600e\u9ebc\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e5%ba%ab%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7-%e6%80%8e%e9%ba%bc%e7%af%a9%e9%81%b8%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e7%9a%84%e6%95%b8%e6%93%9a-eWmTngXVpa\">\u56db\u500b\u5b57\u7b26\u6578\u64da\u5eab\u7be9\u9078\u6280\u5de7 (\u600e\u9ebc\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7be9\u9078\u6578\u64da\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u4efb\u52d9\u3002\u7279\u5225\u662f\u7576\u6211\u5011\u9700\u8981\u8655\u7406\u7279\u5b9a\u9577\u5ea6\u7684\u6578\u64da\u6642\uff0c\u4f8b\u5982\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\uff0c\u9019\u5c31\u9700\u8981\u4e00\u4e9b\u7279\u5b9a\u7684\u6280\u5de7\u548c\u65b9\u6cd5\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%81%b8%e6%93%87%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e7%9a%84%e6%95%b8%e6%93%9a-eWmTngXVpa\">\u70ba\u4ec0\u9ebc\u9078\u64c7\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da?<\/h2>\n<p>\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u5728\u8a31\u591a\u61c9\u7528\u4e2d\u90fd\u975e\u5e38\u5e38\u898b\uff0c\u4f8b\u5982\u7528\u6236\u540d\u3001\u4ee3\u78bc\u3001\u6a19\u8b58\u7b26\u7b49\u3002\u9019\u4e9b\u6578\u64da\u901a\u5e38\u5177\u6709\u4ee5\u4e0b\u7279\u9ede\uff1a<\/p>\n<ul>\n<li>\u7c21\u6f54\u6027\uff1a\u56db\u500b\u5b57\u7b26\u7684\u9577\u5ea6\u4f7f\u5f97\u6578\u64da\u6613\u65bc\u8a18\u61b6\u548c\u8f38\u5165\u3002<\/li>\n<li>\u552f\u4e00\u6027\uff1a\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u56db\u500b\u5b57\u7b26\u7684\u7d44\u5408\u53ef\u4ee5\u63d0\u4f9b\u8db3\u5920\u7684\u552f\u4e00\u6027\uff0c\u7279\u5225\u662f\u5728\u5c0f\u578b\u7cfb\u7d71\u4e2d\u3002<\/li>\n<li>\u53ef\u8b80\u6027\uff1a\u77ed\u5b57\u7b26\u6578\u64da\u901a\u5e38\u66f4\u5bb9\u6613\u88ab\u4eba\u985e\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%a9%e9%81%b8%e5%9b%9b%e5%80%8b%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-eWmTngXVpa\">\u7be9\u9078\u56db\u500b\u5b57\u7b26\u6578\u64da\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\uff0c\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528 SQL \u67e5\u8a62\u8a9e\u8a00\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u7be9\u9078\u6280\u5de7\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-length-%e5%87%bd%e6%95%b8-eWmTngXVpa\">1. \u4f7f\u7528 LENGTH \u51fd\u6578<\/h3>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 LENGTH \u51fd\u6578\u4f86\u6aa2\u67e5\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\u67e5\u8a62\uff0c\u8a72\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u9577\u5ea6\u70ba\u56db\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE LENGTH(your_column) = 4;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-like-%e6%93%8d%e4%bd%9c%e7%ac%a6-eWmTngXVpa\">2. \u4f7f\u7528 LIKE \u64cd\u4f5c\u7b26<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u7be9\u9078\u4ee5\u7279\u5b9a\u5b57\u7b26\u958b\u982d\u6216\u7d50\u5c3e\u7684\u56db\u500b\u5b57\u7b26\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 LIKE \u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4ee5\u5b57\u6bcd\u201cA\u201d\u958b\u982d\u7684\u56db\u500b\u5b57\u7b26\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE your_column LIKE 'A___';<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c&#8217;A___&#8217;\u8868\u793a\u4ee5\u201cA\u201d\u958b\u982d\uff0c\u5f8c\u9762\u8ddf\u8457\u4e09\u500b\u4efb\u610f\u5b57\u7b26\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%ad%a3%e5%89%87%e8%a1%a8%e9%81%94%e5%bc%8f-eWmTngXVpa\">3. \u4f7f\u7528\u6b63\u5247\u8868\u9054\u5f0f<\/h3>\n<p>\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\uff08\u5982 MySQL \u548c PostgreSQL\uff09\u652f\u6301\u6b63\u5247\u8868\u9054\u5f0f\uff0c\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u66f4\u8907\u96dc\u7684\u7be9\u9078\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7531\u56db\u500b\u5b57\u6bcd\u7d44\u6210\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE your_column REGEXP '^[A-Za-z]{4}$';<\/code><\/pre>\n<h3 id=\"4-%e7%b5%84%e5%90%88%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6-eWmTngXVpa\">4. \u7d44\u5408\u591a\u500b\u689d\u4ef6<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6839\u64da\u591a\u500b\u689d\u4ef6\u4f86\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 AND \u548c OR \u64cd\u4f5c\u7b26\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u9577\u5ea6\u70ba\u56db\u4e14\u4ee5\u201cA\u201d\u958b\u982d\u6216\u4ee5\u201cB\u201d\u7d50\u5c3e\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE LENGTH(your_column) = 4 AND (your_column LIKE 'A___' OR your_column LIKE '___B');<\/code><\/pre>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-eWmTngXVpa\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u6642\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u6578\u64da\u5eab\u7d22\u5f15\u7684\u6709\u6548\u6027\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li>\u5b9a\u671f\u6e05\u7406\u6578\u64da\uff0c\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u8a18\u9304\uff0c\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6574\u6f54\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b\u4f86\u5b58\u5132\u5b57\u7b26\u6578\u64da\uff0c\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-eWmTngXVpa\">\u7e3d\u7d50<\/h2>\n<p>\u7be9\u9078\u56db\u500b\u5b57\u7b26\u7684\u6578\u64da\u5eab\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528 SQL \u7684\u5404\u7a2e\u529f\u80fd\uff0c\u5982 LENGTH \u51fd\u6578\u3001LIKE \u64cd\u4f5c\u7b26\u548c\u6b63\u5247\u8868\u9054\u5f0f\uff0c\u60a8\u53ef\u4ee5\u9748\u6d3b\u5730\u7be9\u9078\u51fa\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u60a8\u662f\u5728\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u5de7\u90fd\u5c07\u5c0d\u60a8\u5927\u6709\u88e8\u76ca\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u7ba1\u7406\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u56db\u500b\u5b57\u7b26\u6578\u64da\u5eab\u7be9\u9078\u6280\u5de7\uff0c\u5b78\u7fd2\u6709\u6548\u7be9\u9078\u548c\u67e5\u8a62\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u5206\u6790\u904e\u7a0b\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-188138","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188138","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=188138"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188138\/revisions"}],"predecessor-version":[{"id":188139,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188138\/revisions\/188139"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}