{"id":160805,"date":"2024-11-04T01:09:33","date_gmt":"2024-11-03T17:09:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160805\/"},"modified":"2024-11-04T01:09:34","modified_gmt":"2024-11-03T17:09:34","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bd%8d%e9%81%8b%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160805\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4f4d\u904b\u7b97\u7b26"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bd%8d%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4f4d\u904b\u7b97\u7b26<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u4f4d\u904b\u7b97\u7b26\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5c0d\u6574\u6578\u9032\u884c\u4f4d\u7d1a\u5225\u7684\u64cd\u4f5c\u3002MySQL \u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u4f4d\u904b\u7b97\u7b26\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u66f4\u9748\u6d3b\u5730\u8655\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e MySQL \u4e2d\u7684\u4f4d\u904b\u7b97\u7b26\uff0c\u5305\u62ec\u5176\u985e\u578b\u3001\u7528\u6cd5\u53ca\u5be6\u969b\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bd%8d%e9%81%8b%e7%ae%97%e7%ac%a6%e7%9a%84%e9%a1%9e%e5%9e%8b-nAeJfSKWFX\">\u4f4d\u904b\u7b97\u7b26\u7684\u985e\u578b<\/h2>\n<p>MySQL \u4e2d\u7684\u4f4d\u904b\u7b97\u7b26\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><code>&amp;<\/code>\uff1a\u4f4d\u8207\u904b\u7b97\u7b26<\/li>\n<li><code>|<\/code>\uff1a\u4f4d\u6216\u904b\u7b97\u7b26<\/li>\n<li><code>^<\/code>\uff1a\u4f4d\u7570\u6216\u904b\u7b97\u7b26<\/li>\n<li><code>~<\/code>\uff1a\u4f4d\u53d6\u53cd\u904b\u7b97\u7b26<\/li>\n<li><code>&lt;&lt;<\/code>\uff1a\u5de6\u79fb\u904b\u7b97\u7b26<\/li>\n<li><code>&gt;&gt;<\/code>\uff1a\u53f3\u79fb\u904b\u7b97\u7b26<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%8d%e9%81%8b%e7%ae%97%e7%ac%a6%e7%9a%84%e7%94%a8%e6%b3%95-nAeJfSKWFX\">\u4f4d\u904b\u7b97\u7b26\u7684\u7528\u6cd5<\/h2>\n<p>\u4f4d\u904b\u7b97\u7b26\u7684\u4f7f\u7528\u901a\u5e38\u6d89\u53ca\u5230\u6574\u6578\u985e\u578b\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u6bcf\u500b\u904b\u7b97\u7b26\u7684\u8a73\u7d30\u8aaa\u660e\u53ca\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e4%bd%8d%e8%88%87%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">1. \u4f4d\u8207\u904b\u7b97\u7b26 (&amp;)<\/h3>\n<p>\u4f4d\u8207\u904b\u7b97\u7b26\u7528\u65bc\u5c0d\u5169\u500b\u6574\u6578\u7684\u6bcf\u4e00\u4f4d\u9032\u884c\u6bd4\u8f03\uff0c\u53ea\u6709\u7576\u5169\u500b\u4f4d\u90fd\u662f 1 \u6642\uff0c\u7d50\u679c\u624d\u70ba 1\u3002<\/p>\n<pre><code>SELECT 5 &amp; 3; -- \u7d50\u679c\u70ba 1 (0101 &amp; 0011 = 0001)<\/code><\/pre>\n<h3 id=\"2-%e4%bd%8d%e6%88%96%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">2. \u4f4d\u6216\u904b\u7b97\u7b26 (|)<\/h3>\n<p>\u4f4d\u6216\u904b\u7b97\u7b26\u7528\u65bc\u5c0d\u5169\u500b\u6574\u6578\u7684\u6bcf\u4e00\u4f4d\u9032\u884c\u6bd4\u8f03\uff0c\u53ea\u8981\u6709\u4e00\u500b\u4f4d\u662f 1\uff0c\u7d50\u679c\u5c31\u70ba 1\u3002<\/p>\n<pre><code>SELECT 5 | 3; -- \u7d50\u679c\u70ba 7 (0101 | 0011 = 0111)<\/code><\/pre>\n<h3 id=\"3-%e4%bd%8d%e7%95%b0%e6%88%96%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">3. \u4f4d\u7570\u6216\u904b\u7b97\u7b26 (^) <\/h3>\n<p>\u4f4d\u7570\u6216\u904b\u7b97\u7b26\u7528\u65bc\u5c0d\u5169\u500b\u6574\u6578\u7684\u6bcf\u4e00\u4f4d\u9032\u884c\u6bd4\u8f03\uff0c\u7576\u5169\u500b\u4f4d\u4e0d\u540c\u6642\uff0c\u7d50\u679c\u70ba 1\u3002<\/p>\n<pre><code>SELECT 5 ^ 3; -- \u7d50\u679c\u70ba 6 (0101 ^ 0011 = 0110)<\/code><\/pre>\n<h3 id=\"4-%e4%bd%8d%e5%8f%96%e5%8f%8d%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">4. \u4f4d\u53d6\u53cd\u904b\u7b97\u7b26 (~)<\/h3>\n<p>\u4f4d\u53d6\u53cd\u904b\u7b97\u7b26\u7528\u65bc\u5c07\u6574\u6578\u7684\u6bcf\u4e00\u4f4d\u9032\u884c\u53cd\u8f49\uff0c0 \u8b8a\u70ba 1\uff0c1 \u8b8a\u70ba 0\u3002<\/p>\n<pre><code>SELECT ~5; -- \u7d50\u679c\u70ba -6 (\u53d6\u53cd 0101 = 1010)<\/code><\/pre>\n<h3 id=\"5-%e5%b7%a6%e7%a7%bb%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">5. \u5de6\u79fb\u904b\u7b97\u7b26 (&lt;&lt;)<\/h3>\n<p>\u5de6\u79fb\u904b\u7b97\u7b26\u5c07\u6574\u6578\u7684\u4f4d\u5411\u5de6\u79fb\u52d5\u6307\u5b9a\u7684\u4f4d\u6578\uff0c\u53f3\u5074\u7528 0 \u586b\u5145\u3002<\/p>\n<pre><code>SELECT 5 &lt;&lt; 1; -- \u7d50\u679c\u70ba 10 (0101 \u5de6\u79fb 1 \u4f4d = 1010)<\/code><\/pre>\n<h3 id=\"6-%e5%8f%b3%e7%a7%bb%e9%81%8b%e7%ae%97%e7%ac%a6-nAeJfSKWFX\">6. \u53f3\u79fb\u904b\u7b97\u7b26 (&gt;&gt;)<\/h3>\n<p>\u53f3\u79fb\u904b\u7b97\u7b26\u5c07\u6574\u6578\u7684\u4f4d\u5411\u53f3\u79fb\u52d5\u6307\u5b9a\u7684\u4f4d\u6578\uff0c\u5de6\u5074\u7528\u7b26\u865f\u4f4d\u586b\u5145\u3002<\/p>\n<pre><code>SELECT 5 &gt;&gt; 1; -- \u7d50\u679c\u70ba 2 (0101 \u53f3\u79fb 1 \u4f4d = 0010)<\/code><\/pre>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e7%af%84%e4%be%8b-nAeJfSKWFX\">\u5be6\u969b\u61c9\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4f4d\u904b\u7b97\u7b26\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u80fd\u767c\u63ee\u4f5c\u7528\uff0c\u4f8b\u5982\u5728\u6b0a\u9650\u7ba1\u7406\u3001\u6578\u64da\u58d3\u7e2e\u548c\u52a0\u5bc6\u7b49\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6b0a\u9650\u7ba1\u7406\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>-- \u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u6b0a\u9650\u7684\u6574\u6578\u8868\u793a\n-- 1: \u8b80\u53d6\u6b0a\u9650, 2: \u5beb\u5165\u6b0a\u9650, 4: \u522a\u9664\u6b0a\u9650\nSET @permissions = 5; -- 0101\uff0c\u8868\u793a\u8b80\u53d6\u548c\u522a\u9664\u6b0a\u9650\n\n-- \u6aa2\u67e5\u7528\u6236\u662f\u5426\u64c1\u6709\u5beb\u5165\u6b0a\u9650\nSELECT (@permissions &amp; 2) &gt; 0 AS has_write_permission; -- \u7d50\u679c\u70ba 0\uff0c\u8868\u793a\u6c92\u6709\u5beb\u5165\u6b0a\u9650\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nAeJfSKWFX\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u7684\u4f4d\u904b\u7b97\u7b26\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u80fd\u5920\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u63d0\u9ad8\u6548\u7387\u3002\u7121\u8ad6\u662f\u5728\u6b0a\u9650\u7ba1\u7406\u9084\u662f\u6578\u64da\u8655\u7406\u4e2d\uff0c\u9748\u6d3b\u904b\u7528\u9019\u4e9b\u904b\u7b97\u7b26\u90fd\u80fd\u8b93\u958b\u767c\u8005\u66f4\u597d\u5730\u63a7\u5236\u6578\u64da\u3002\u82e5\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u8cc7\u6599\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 MySQL \u4f4d\u904b\u7b97\u7b26\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u5728\u8cc7\u6599\u5eab\u4e2d\u9032\u884c\u9ad8\u6548\u7684\u4f4d\u5143\u904b\u7b97\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u8207\u6578\u64da\u8655\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-160805","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160805","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=160805"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160805\/revisions"}],"predecessor-version":[{"id":160806,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160805\/revisions\/160806"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}