{"id":184320,"date":"2024-11-10T12:14:19","date_gmt":"2024-11-10T04:14:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/184320\/"},"modified":"2024-11-10T12:14:20","modified_gmt":"2024-11-10T04:14:20","slug":"%e4%bd%bf%e7%94%a8redis%e7%b7%a9%e5%ad%98%e8%a7%a3%e6%b1%ba%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8%e5%95%8f%e9%a1%8c%ef%bc%88redis%e7%b7%a9%e5%ad%98%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/184320\/","title":{"rendered":"\u4f7f\u7528Redis\u7de9\u5b58\u89e3\u6c7a\u7a7a\u6307\u91dd\u7570\u5e38\u554f\u984c\uff08redis\u7de9\u5b58\u7a7a\u6307\u91dd\u7570\u5e38\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8redis%e7%b7%a9%e5%ad%98%e8%a7%a3%e6%b1%ba%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8%e5%95%8f%e9%a1%8c%ef%bc%88redis%e7%b7%a9%e5%ad%98%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8-LCjOnPnmDJ\">\u4f7f\u7528Redis\u7de9\u5b58\u89e3\u6c7a\u7a7a\u6307\u91dd\u7570\u5e38\u554f\u984c\uff08redis\u7de9\u5b58\u7a7a\u6307\u91dd\u7570\u5e38\uff09<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u61c9\u7528\u7a0b\u5f0f\u958b\u767c\u4e2d\uff0c\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u662f\u5169\u500b\u81f3\u95dc\u91cd\u8981\u7684\u56e0\u7d20\u3002\u96a8\u8457\u7528\u6236\u9700\u6c42\u7684\u589e\u52a0\uff0c\u958b\u767c\u8005\u9762\u81e8\u8457\u8d8a\u4f86\u8d8a\u591a\u7684\u6311\u6230\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u548c\u907f\u514d\u7a7a\u6307\u91dd\u7570\u5e38\u554f\u984c\u3002Redis\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u6548\u7684\u7de9\u5b58\u89e3\u6c7a\u65b9\u6848\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8%ef%bc%9f-LCjOnPnmDJ\">\u4ec0\u9ebc\u662f\u7a7a\u6307\u91dd\u7570\u5e38\uff1f<\/h2>\n<p>\u7a7a\u6307\u91dd\u7570\u5e38\uff08Null Pointer Exception\uff09\u662f\u6307\u5728\u7a0b\u5f0f\u4e2d\u5617\u8a66\u8a2a\u554f\u4e00\u500b\u672a\u521d\u59cb\u5316\u6216\u5df2\u88ab\u8a2d\u7f6e\u70banull\u7684\u5c0d\u8c61\u6642\u6240\u5f15\u767c\u7684\u932f\u8aa4\u3002\u9019\u7a2e\u7570\u5e38\u901a\u5e38\u6703\u5c0e\u81f4\u61c9\u7528\u7a0b\u5f0f\u5d29\u6f70\uff0c\u5f71\u97ff\u7528\u6236\u9ad4\u9a57\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0c\u958b\u767c\u8005\u9700\u8981\u5728\u4ee3\u78bc\u4e2d\u9032\u884c\u5145\u5206\u7684\u6aa2\u67e5\u548c\u8655\u7406\u3002<\/p>\n<h2 id=\"redis%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-LCjOnPnmDJ\">Redis\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>Redis\u662f\u4e00\u7a2e\u958b\u6e90\u7684\u9ad8\u6027\u80fd\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u7528\u65bc\u7de9\u5b58\u548c\u6578\u64da\u6301\u4e45\u5316\u3002\u5b83\u652f\u6301\u591a\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u5982\u5b57\u7b26\u4e32\u3001\u54c8\u5e0c\u3001\u5217\u8868\u3001\u96c6\u5408\u7b49\uff0c\u4e26\u4e14\u5177\u6709\u9ad8\u6548\u7684\u8b80\u5beb\u6027\u80fd\u3002\u4f7f\u7528Redis\u4f5c\u70ba\u7de9\u5b58\u5c64\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u61c9\u7528\u7a0b\u5f0f\u7684\u97ff\u61c9\u901f\u5ea6\uff0c\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8redis%e7%b7%a9%e5%ad%98%e4%be%86%e8%a7%a3%e6%b1%ba%e7%a9%ba%e6%8c%87%e9%87%9d%e7%95%b0%e5%b8%b8%e5%95%8f%e9%a1%8c-LCjOnPnmDJ\">\u5982\u4f55\u4f7f\u7528Redis\u7de9\u5b58\u4f86\u89e3\u6c7a\u7a7a\u6307\u91dd\u7570\u5e38\u554f\u984c<\/h2>\n<p>\u4f7f\u7528Redis\u7de9\u5b58\u53ef\u4ee5\u6709\u6548\u5730\u6e1b\u5c11\u7a7a\u6307\u91dd\u7570\u5e38\u7684\u767c\u751f\uff0c\u5177\u9ad4\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<h3 id=\"1-%e7%b7%a9%e5%ad%98%e5%b8%b8%e7%94%a8%e6%95%b8%e6%93%9a-LCjOnPnmDJ\">1. \u7de9\u5b58\u5e38\u7528\u6578\u64da<\/h3>\n<p>\u5c07\u7d93\u5e38\u8a2a\u554f\u7684\u6578\u64da\u7de9\u5b58\u5230Redis\u4e2d\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u6bcf\u6b21\u90fd\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u7576\u7528\u6236\u767b\u9304\u6642\uff0c\u53ef\u4ee5\u5c07\u7528\u6236\u4fe1\u606f\u7de9\u5b58\u5230Redis\u4e2d\uff0c\u5f8c\u7e8c\u7684\u8acb\u6c42\u53ef\u4ee5\u76f4\u63a5\u5f9e\u7de9\u5b58\u4e2d\u7372\u53d6\uff0c\u5f9e\u800c\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u7684\u4f9d\u8cf4\u3002<\/p>\n<pre><code>import redis\n\n# \u9023\u63a5\u5230Redis\nr = redis.Redis(host='localhost', port=6379, db=0)\n\n# \u7de9\u5b58\u7528\u6236\u4fe1\u606f\nuser_id = 1\nuser_info = {'name': 'John', 'age': 30}\nr.set(f'user:{user_id}', json.dumps(user_info))\n<\/code><\/pre>\n<h3 id=\"2-%e6%aa%a2%e6%9f%a5%e7%b7%a9%e5%ad%98%e6%95%b8%e6%93%9a%e7%9a%84%e6%9c%89%e6%95%88%e6%80%a7-LCjOnPnmDJ\">2. \u6aa2\u67e5\u7de9\u5b58\u6578\u64da\u7684\u6709\u6548\u6027<\/h3>\n<p>\u5728\u4f7f\u7528\u7de9\u5b58\u6578\u64da\u4e4b\u524d\uff0c\u61c9\u8a72\u6aa2\u67e5\u8a72\u6578\u64da\u662f\u5426\u5b58\u5728\uff0c\u907f\u514d\u56e0\u70ba\u6578\u64da\u4e0d\u5b58\u5728\u800c\u5f15\u767c\u7a7a\u6307\u91dd\u7570\u5e38\u3002\u53ef\u4ee5\u4f7f\u7528Redis\u7684`exists`\u65b9\u6cd5\u4f86\u6aa2\u67e5\u7de9\u5b58\u4e2d\u7684\u6578\u64da\u3002<\/p>\n<pre><code>if r.exists(f'user:{user_id}'):\n    user_info = json.loads(r.get(f'user:{user_id}'))\nelse:\n    # \u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u6578\u64da\n    user_info = get_user_from_db(user_id)\n    r.set(f'user:{user_id}', json.dumps(user_info))\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e9%bb%98%e8%aa%8d%e5%80%bc-LCjOnPnmDJ\">3. \u4f7f\u7528\u9ed8\u8a8d\u503c<\/h3>\n<p>\u5728\u7372\u53d6\u7de9\u5b58\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u8a2d\u7f6e\u9ed8\u8a8d\u503c\uff0c\u4ee5\u9632\u6b62\u7a7a\u6307\u91dd\u7570\u5e38\u7684\u767c\u751f\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7de9\u5b58\u4e2d\u6c92\u6709\u7528\u6236\u4fe1\u606f\uff0c\u53ef\u4ee5\u8fd4\u56de\u4e00\u500b\u7a7a\u5c0d\u8c61\u6216\u9810\u8a2d\u503c\u3002<\/p>\n<pre><code>user_info = json.loads(r.get(f'user:{user_id}')) or {}\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-LCjOnPnmDJ\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528Redis\u7de9\u5b58\u4e0d\u50c5\u53ef\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5f0f\u7684\u6027\u80fd\uff0c\u9084\u80fd\u6709\u6548\u5730\u6e1b\u5c11\u7a7a\u6307\u91dd\u7570\u5e38\u7684\u767c\u751f\u3002\u901a\u904e\u7de9\u5b58\u5e38\u7528\u6578\u64da\u3001\u6aa2\u67e5\u6578\u64da\u6709\u6548\u6027\u4ee5\u53ca\u4f7f\u7528\u9ed8\u8a8d\u503c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u8a2d\u8a08\u61c9\u7528\u7a0b\u5f0f\u6642\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u63d0\u5347\u60a8\u7684\u61c9\u7528\u7a0b\u5f0f\u6027\u80fd\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72Redis\u7de9\u5b58\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u5e36\u4f86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528Redis\u7de9\u5b58\u6709\u6548\u89e3\u6c7a\u7a7a\u6307\u91dd\u7570\u5e38\u554f\u984c\uff0c\u63d0\u5347\u7cfb\u7d71\u7a69\u5b9a\u6027\u8207\u6027\u80fd\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u53ef\u9760\u6027\u8207\u53ef\u7528\u6027\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-184320","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/184320","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=184320"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/184320\/revisions"}],"predecessor-version":[{"id":184321,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/184320\/revisions\/184321"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=184320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=184320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=184320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}