{"id":196221,"date":"2024-11-13T21:29:20","date_gmt":"2024-11-13T13:29:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196221\/"},"modified":"2024-11-13T21:29:21","modified_gmt":"2024-11-13T13:29:21","slug":"%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%9f%e7%90%86%ef%bc%8c%e8%88%87%e7%8e%8b%e7%8f%8a%e6%97%97%e5%b9%9f%e9%ae%ae%e6%98%8e%ef%bc%81-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%9f%e7%90%86%e7%8e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196221\/","title":{"rendered":"\u638c\u63e1\u6578\u64da\u5eab\u539f\u7406\uff0c\u8207\u738b\u73ca\u65d7\u5e5f\u9bae\u660e\uff01 (\u6578\u64da\u5eab\u539f\u7406\u738b\u73ca)"},"content":{"rendered":"<h1 id=\"%e6%8e%8c%e6%8f%a1%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%9f%e7%90%86%ef%bc%8c%e8%88%87%e7%8e%8b%e7%8f%8a%e6%97%97%e5%b9%9f%e9%ae%ae%e6%98%8e%ef%bc%81-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%8e%9f%e7%90%86%e7%8e%8b-EJYAzvwqKU\">\u638c\u63e1\u6578\u64da\u5eab\u539f\u7406\uff0c\u8207\u738b\u73ca\u65d7\u5e5f\u9bae\u660e\uff01 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id=\"%e9%97%9c%e4%bf%82%e5%9e%8b%e6%95%b8%e6%93%9a%e5%ba%ab-EJYAzvwqKU\">\u95dc\u4fc2\u578b\u6578\u64da\u5eab<\/h3>\n<p>\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4f7f\u7528\u8868\u683c\u4f86\u5b58\u5132\u6578\u64da\uff0c\u9019\u4e9b\u8868\u683c\u4e4b\u9593\u53ef\u4ee5\u901a\u904e\u9375\uff08key\uff09\u9032\u884c\u95dc\u806f\u3002\u6bcf\u500b\u8868\u683c\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u884c\u4ee3\u8868\u8a18\u9304\uff0c\u5217\u4ee3\u8868\u5c6c\u6027\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u8207\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4ea4\u4e92\u7684\u6a19\u6e96\u8a9e\u8a00\u3002<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18;<\/code><\/pre>\n<p>\u4e0a\u8ff0 SQL \u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5927\u65bc 18 \u6b72\u7684\u7528\u6236\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e9%9d%9e%e9%97%9c%e4%bf%82%e5%9e%8b%e6%95%b8%e6%93%9a%e5%ba%ab-EJYAzvwqKU\">\u975e\u95dc\u4fc2\u578b\u6578\u64da\u5eab<\/h3>\n<p>\u975e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u5247\u4e0d\u4f7f\u7528\u8868\u683c\u7d50\u69cb\uff0c\u800c\u662f\u4ee5\u6587\u6a94\u3001\u9375\u503c\u5c0d\u6216\u5716\u5f62\u7684\u5f62\u5f0f\u5b58\u5132\u6578\u64da\u3002\u9019\u985e\u6578\u64da\u5eab\u901a\u5e38\u66f4\u5177\u9748\u6d3b\u6027\uff0c\u9069\u5408\u8655\u7406\u5927\u898f\u6a21\u548c\u591a\u6a23\u5316\u7684\u6578\u64da\u3002<\/p>\n<pre><code>{ \"name\": \"\u738b\u73ca\", \"age\": 30, \"city\": \"\u9999\u6e2f\" }<\/code><\/pre>\n<p>\u9019\u662f\u4e00\u500b JSON \u683c\u5f0f\u7684\u6587\u6a94\uff0c\u5e38\u898b\u65bc\u975e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%9f%ba%e6%9c%ac%e5%8e%9f%e7%90%86-EJYAzvwqKU\">\u6578\u64da\u5eab\u7684\u57fa\u672c\u539f\u7406<\/h2>\n<p>\u6578\u64da\u5eab\u7684\u904b\u4f5c\u57fa\u65bc\u5e7e\u500b\u57fa\u672c\u539f\u7406\uff0c\u5305\u62ec\u6578\u64da\u7684\u6301\u4e45\u6027\u3001\u4e00\u81f4\u6027\u3001\u9694\u96e2\u6027\u548c\u53ef\u6301\u7e8c\u6027\uff08ACID \u539f\u5247\uff09\u3002\u9019\u4e9b\u539f\u5247\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u53ef\u9760\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<h3 id=\"acid-%e5%8e%9f%e5%89%87-EJYAzvwqKU\">ACID \u539f\u5247<\/h3>\n<ul>\n<li><strong>\u539f\u5b50\u6027\uff08Atomicity\uff09<\/strong>: \u4ea4\u6613\u8981\u9ebc\u5b8c\u5168\u57f7\u884c\uff0c\u8981\u9ebc\u5b8c\u5168\u4e0d\u57f7\u884c\u3002<\/li>\n<li><strong>\u4e00\u81f4\u6027\uff08Consistency\uff09<\/strong>: \u4ea4\u6613\u5fc5\u9808\u4f7f\u6578\u64da\u5f9e\u4e00\u500b\u4e00\u81f4\u72c0\u614b\u8f49\u8b8a\u5230\u53e6\u4e00\u500b\u4e00\u81f4\u72c0\u614b\u3002<\/li>\n<li><strong>\u9694\u96e2\u6027\uff08Isolation\uff09<\/strong>: \u540c\u6642\u57f7\u884c\u7684\u4ea4\u6613\u4e0d\u61c9\u4e92\u76f8\u5e72\u64fe\u3002<\/li>\n<li><strong>\u6301\u4e45\u6027\uff08Durability\uff09<\/strong>: \u4e00\u65e6\u4ea4\u6613\u5b8c\u6210\uff0c\u6578\u64da\u7684\u8b8a\u66f4\u61c9\u6301\u4e45\u4fdd\u5b58\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-EJYAzvwqKU\">\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u91cd\u8981\u6027<\/h2>\n<p>\u826f\u597d\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u662f\u78ba\u4fdd\u6578\u64da\u5eab\u6027\u80fd\u548c\u53ef\u64f4\u5c55\u6027\u7684\u95dc\u9375\u3002\u8a2d\u8a08\u6642\u9700\u8981\u8003\u616e\u6578\u64da\u7684\u7d50\u69cb\u3001\u95dc\u806f\u6027\u4ee5\u53ca\u672a\u4f86\u7684\u64f4\u5c55\u9700\u6c42\u3002\u5e38\u898b\u7684\u8a2d\u8a08\u65b9\u6cd5\u5305\u62ec\u5be6\u9ad4-\u95dc\u4fc2\u6a21\u578b\uff08ER \u6a21\u578b\uff09\u548c\u6b63\u898f\u5316\u3002<\/p>\n<h3 id=\"%e5%af%a6%e9%ab%94-%e9%97%9c%e4%bf%82%e6%a8%a1%e5%9e%8b%ef%bc%88er-%e6%a8%a1%e5%9e%8b%ef%bc%89-EJYAzvwqKU\">\u5be6\u9ad4-\u95dc\u4fc2\u6a21\u578b\uff08ER \u6a21\u578b\uff09<\/h3>\n<p>ER \u6a21\u578b\u662f\u4e00\u7a2e\u5716\u5f62\u5316\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u5de5\u5177\uff0c\u7528\u65bc\u63cf\u8ff0\u6578\u64da\u7684\u7d50\u69cb\u548c\u95dc\u806f\u3002\u901a\u904e\u5be6\u9ad4\uff08Entity\uff09\u3001\u5c6c\u6027\uff08Attribute\uff09\u548c\u95dc\u806f\uff08Relationship\uff09\uff0c\u8a2d\u8a08\u8005\u53ef\u4ee5\u6e05\u6670\u5730\u8868\u9054\u6578\u64da\u4e4b\u9593\u7684\u95dc\u4fc2\u3002<\/p>\n<h3 id=\"%e6%ad%a3%e8%a6%8f%e5%8c%96-EJYAzvwqKU\">\u6b63\u898f\u5316<\/h3>\n<p>\u6b63\u898f\u5316\u662f\u5c07\u6578\u64da\u5206\u89e3\u70ba\u591a\u500b\u8868\u683c\uff0c\u4ee5\u6d88\u9664\u5197\u9918\u548c\u4f9d\u8cf4\u6027\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-EJYAzvwqKU\">\u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1\u6578\u64da\u5eab\u539f\u7406\u5c0d\u65bc\u4efb\u4f55\u5e0c\u671b\u5728\u6280\u8853\u9818\u57df\u53d6\u5f97\u6210\u529f\u7684\u4eba\u4f86\u8aaa\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u901a\u904e\u7406\u89e3\u6578\u64da\u5eab\u7684\u57fa\u672c\u6982\u5ff5\u3001\u539f\u7406\u548c\u8a2d\u8a08\u65b9\u6cd5\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\u3002\u7121\u8ad6\u662f\u9078\u64c7\u95dc\u4fc2\u578b\u9084\u662f\u975e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff0c\u4e86\u89e3\u5176\u7279\u9ede\u548c\u9069\u7528\u5834\u666f\u5c07\u5e6b\u52a9\u60a8\u505a\u51fa\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u6709\u8208\u8da3\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u6578\u64da\u5eab\u539f\u7406\uff0c\u8207\u738b\u73ca\u4e00\u8d77\u6df1\u5165\u63a2\u7d22\u6578\u64da\u7ba1\u7406\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u63d0\u5347\u4f60\u7684\u6280\u8853\u80fd\u529b\uff0c\u958b\u555f\u6578\u64da\u4e16\u754c\u7684\u5927\u9580\uff01<\/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-196221","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196221","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=196221"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196221\/revisions"}],"predecessor-version":[{"id":196222,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196221\/revisions\/196222"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=196221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=196221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=196221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}