{"id":79552,"date":"2024-10-16T13:15:18","date_gmt":"2024-10-16T05:15:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79552\/"},"modified":"2024-10-16T13:15:18","modified_gmt":"2024-10-16T05:15:18","slug":"mysql%e6%8c%87%e4%bb%a4-repeat%ef%bc%88%e9%87%8d%e8%a4%87%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79552\/","title":{"rendered":"MySQL\u6307\u4ee4: REPEAT()\uff08\u91cd\u8907\u5b57\u7b26\u4e32\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-repeat%ef%bc%88%e9%87%8d%e8%a4%87%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%89-bsFiyfrzPn\">MySQL\u6307\u4ee4: REPEAT()\uff08\u91cd\u8907\u5b57\u7b26\u4e32\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u8cc7\u6599\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684REPEAT()\u51fd\u6578\uff0c\u9019\u662f\u4e00\u500b\u7528\u65bc\u91cd\u8907\u5b57\u7b26\u4e32\u7684\u6709\u7528\u5de5\u5177\u3002<\/p>\n<h2 id=\"repeat%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-bsFiyfrzPn\">REPEAT()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>REPEAT()\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u91cd\u8907\u4e00\u5b9a\u7684\u6b21\u6578\u3002\u9019\u5728\u9700\u8981\u751f\u6210\u91cd\u8907\u5167\u5bb9\u6216\u683c\u5f0f\u5316\u8f38\u51fa\u6642\u975e\u5e38\u6709\u7528\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>REPEAT(str, count)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>str<\/code>\u662f\u8981\u91cd\u8907\u7684\u5b57\u7b26\u4e32\uff0c\u800c<code>count<\/code>\u662f\u91cd\u8907\u7684\u6b21\u6578\u3002\u5982\u679c<code>count<\/code>\u70ba0\uff0c\u5247\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\uff1b\u5982\u679c<code>count<\/code>\u70ba\u8ca0\u6578\uff0c\u5247\u8fd4\u56deNULL\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-bsFiyfrzPn\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528REPEAT()\u51fd\u6578\u7684\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u5176\u7528\u6cd5\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-bsFiyfrzPn\">\u7bc4\u4f8b1\uff1a\u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code>SELECT REPEAT('abc', 3) AS repeated_string;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u5b57\u7b26\u4e32<code>abcabcabc<\/code>\uff0c\u56e0\u70ba<code>abc<\/code>\u88ab\u91cd\u8907\u4e86\u4e09\u6b21\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2%ef%bc%9a%e8%88%87%e5%85%b6%e4%bb%96%e5%87%bd%e6%95%b8%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-bsFiyfrzPn\">\u7bc4\u4f8b2\uff1a\u8207\u5176\u4ed6\u51fd\u6578\u7d50\u5408\u4f7f\u7528<\/h3>\n<p>REPEAT()\u51fd\u6578\u53ef\u4ee5\u8207\u5176\u4ed6MySQL\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u9054\u5230\u66f4\u8907\u96dc\u7684\u6548\u679c\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528CONCAT()\u51fd\u6578\u4f86\u9023\u63a5\u591a\u500b\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre><code>SELECT CONCAT(REPEAT('abc', 2), 'def') AS combined_string;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de<code>abcabcdef<\/code>\uff0c\u56e0\u70ba<code>abc<\/code>\u88ab\u91cd\u8907\u4e86\u5169\u6b21\uff0c\u7136\u5f8c\u8207<code>def<\/code>\u9023\u63a5\u5728\u4e00\u8d77\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3%ef%bc%9a%e5%9c%a8%e8%a1%a8%e6%a0%bc%e4%b8%ad%e4%bd%bf%e7%94%a8-bsFiyfrzPn\">\u7bc4\u4f8b3\uff1a\u5728\u8868\u683c\u4e2d\u4f7f\u7528<\/h3>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u540d\u70ba<code>products<\/code>\u7684\u8868\u683c\uff0c\u5305\u542b\u4e00\u500b<code>name<\/code>\u6b04\u4f4d\uff0c\u60a8\u60f3\u8981\u70ba\u6bcf\u500b\u7522\u54c1\u751f\u6210\u4e00\u500b\u91cd\u8907\u7684\u540d\u7a31\uff1a<\/p>\n<pre><code>SELECT name, REPEAT(name, 2) AS repeated_name FROM products;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u7684\u540d\u7a31\u53ca\u5176\u91cd\u8907\u7684\u7248\u672c\uff0c\u65b9\u4fbf\u7528\u6236\u67e5\u770b\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-bsFiyfrzPn\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528REPEAT()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c<code>count<\/code>\u70ba0\uff0c\u5247\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5982\u679c<code>count<\/code>\u70ba\u8ca0\u6578\uff0c\u5247\u8fd4\u56deNULL\u3002<\/li>\n<li>\u91cd\u8907\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u4e0d\u80fd\u8d85\u904eMySQL\u7684\u6700\u5927\u5b57\u7b26\u4e32\u9577\u5ea6\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-bsFiyfrzPn\">\u7e3d\u7d50<\/h2>\n<p>REPEAT()\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728MySQL\u4e2d\u8f15\u9b06\u751f\u6210\u91cd\u8907\u7684\u5b57\u7b26\u4e32\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u8655\u7406\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u4fbf\u5229\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6574\u9ad4\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4REPEAT()\uff0c\u8f15\u9b06\u91cd\u8907\u5b57\u7b26\u4e32\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u64cd\u4f5c\uff0c\u589e\u5f37\u6578\u64da\u5eab\u7ba1\u7406\u80fd\u529b\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-79552","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79552","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=79552"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79552\/revisions"}],"predecessor-version":[{"id":79553,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79552\/revisions\/79553"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}