{"id":62271,"date":"2024-10-13T17:36:19","date_gmt":"2024-10-13T09:36:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62271\/"},"modified":"2024-10-13T17:36:19","modified_gmt":"2024-10-13T09:36:19","slug":"leveldb-%e4%b8%80%e5%80%8b%e8%b6%85%e9%ab%98%e6%80%a7%e8%83%bd%e7%9a%84k-v%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62271\/","title":{"rendered":"LevelDB\u2014\u4e00\u500b\u8d85\u9ad8\u6027\u80fd\u7684K\/V\u6578\u64da\u5eab"},"content":{"rendered":"<h1 id=\"leveldb-%e4%b8%80%e5%80%8b%e8%b6%85%e9%ab%98%e6%80%a7%e8%83%bd%e7%9a%84k-v%e6%95%b8%e6%93%9a%e5%ba%ab-wvlPkXGImE\">LevelDB\u2014\u4e00\u500b\u8d85\u9ad8\u6027\u80fd\u7684K\/V\u6578\u64da\u5eab<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002LevelDB\u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u9375\u503c\uff08K\/V\uff09\u6578\u64da\u5eab\uff0c\u56e0\u5176\u512a\u8d8a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u6027\u800c\u53d7\u5230\u5ee3\u6cdb\u95dc\u6ce8\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eLevelDB\u7684\u7279\u6027\u3001\u512a\u52e2\u53ca\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afleveldb%ef%bc%9f-wvlPkXGImE\">\u4ec0\u9ebc\u662fLevelDB\uff1f<\/h2>\n<p>LevelDB\u662f\u4e00\u500b\u7531Google\u958b\u767c\u7684\u958b\u6e90\u9375\u503c\u6578\u64da\u5eab\uff0c\u5c08\u70ba\u9ad8\u6027\u80fd\u548c\u9ad8\u6548\u80fd\u7684\u6578\u64da\u5b58\u5132\u800c\u8a2d\u8a08\u3002\u5b83\u4f7f\u7528\u4e86Log-Structured Merge-tree\uff08LSM-tree\uff09\u7d50\u69cb\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u5beb\u5165\u64cd\u4f5c\u4e0a\u8868\u73fe\u51fa\u8272\uff0c\u7279\u5225\u9069\u5408\u9700\u8981\u983b\u7e41\u5beb\u5165\u7684\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"leveldb%e7%9a%84%e7%89%b9%e6%80%a7-wvlPkXGImE\">LevelDB\u7684\u7279\u6027<\/h2>\n<ul>\n<li><strong>\u9ad8\u6548\u7684\u5beb\u5165\u6027\u80fd\uff1a<\/strong>LevelDB\u7684\u8a2d\u8a08\u4f7f\u5f97\u5b83\u80fd\u5920\u5feb\u901f\u8655\u7406\u5927\u91cf\u7684\u5beb\u5165\u8acb\u6c42\uff0c\u9019\u5c0d\u65bc\u9700\u8981\u9ad8\u983b\u5beb\u5165\u7684\u61c9\u7528\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<li><strong>\u58d3\u7e2e\u529f\u80fd\uff1a<\/strong>LevelDB\u652f\u6301\u6578\u64da\u58d3\u7e2e\uff0c\u9019\u4e0d\u50c5\u80fd\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u80fd\u63d0\u9ad8\u8b80\u53d6\u6027\u80fd\u3002<\/li>\n<li><strong>\u7c21\u55ae\u7684API\uff1a<\/strong>LevelDB\u63d0\u4f9b\u4e86\u7c21\u55ae\u6613\u7528\u7684API\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u7684\u8b80\u53d6\u548c\u5beb\u5165\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u652f\u6301\u4e8b\u52d9\uff1a<\/strong>LevelDB\u652f\u6301\u539f\u5b50\u64cd\u4f5c\uff0c\u9019\u610f\u5473\u8457\u591a\u500b\u64cd\u4f5c\u53ef\u4ee5\u4f5c\u70ba\u4e00\u500b\u55ae\u4f4d\u57f7\u884c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"leveldb%e7%9a%84%e5%84%aa%e5%8b%a2-wvlPkXGImE\">LevelDB\u7684\u512a\u52e2<\/h2>\n<p>LevelDB\u7684\u512a\u52e2\u4e3b\u8981\u9ad4\u73fe\u5728\u4ee5\u4e0b\u5e7e\u500b\u65b9\u9762\uff1a<\/p>\n<h3 id=\"1-%e9%ab%98%e6%80%a7%e8%83%bd-wvlPkXGImE\">1. \u9ad8\u6027\u80fd<\/h3>\n<p>LevelDB\u5728\u5beb\u5165\u6027\u80fd\u4e0a\u8868\u73fe\u512a\u7570\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u5c0f\u578b\u5beb\u5165\u8acb\u6c42\u6642\u3002\u9019\u4f7f\u5f97\u5b83\u6210\u70ba\u9700\u8981\u9ad8\u541e\u5410\u91cf\u7684\u61c9\u7528\u7684\u7406\u60f3\u9078\u64c7\u3002<\/p>\n<h3 id=\"2-%e5%8f%af%e6%93%b4%e5%b1%95%e6%80%a7-wvlPkXGImE\">2. \u53ef\u64f4\u5c55\u6027<\/h3>\n<p>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0cLevelDB\u80fd\u5920\u6709\u6548\u5730\u64f4\u5c55\uff0c\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\u3002\u5176LSM-tree\u7d50\u69cb\u4f7f\u5f97\u6578\u64da\u7684\u8b80\u53d6\u548c\u5beb\u5165\u64cd\u4f5c\u80fd\u5920\u5728\u4e0d\u540c\u5c64\u7d1a\u4e2d\u9032\u884c\uff0c\u5f9e\u800c\u63d0\u9ad8\u4e86\u6574\u9ad4\u6548\u7387\u3002<\/p>\n<h3 id=\"3-%e8%b7%a8%e5%b9%b3%e5%8f%b0%e6%94%af%e6%8c%81-wvlPkXGImE\">3. \u8de8\u5e73\u53f0\u652f\u6301<\/h3>\n<p>LevelDB\u53ef\u4ee5\u5728\u591a\u7a2e\u64cd\u4f5c\u7cfb\u7d71\u4e0a\u904b\u884c\uff0c\u5305\u62ecLinux\u3001Windows\u548cmacOS\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u4e0d\u540c\u74b0\u5883\u4e2d\u7684\u61c9\u7528\u8b8a\u5f97\u66f4\u52a0\u9748\u6d3b\u3002<\/p>\n<h2 id=\"leveldb%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-wvlPkXGImE\">LevelDB\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>LevelDB\u9069\u7528\u65bc\u591a\u7a2e\u61c9\u7528\u5834\u666f\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u4f8b\u5b50\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u7de9\u5b58\uff1a<\/strong>\u7531\u65bc\u5176\u9ad8\u6548\u7684\u5beb\u5165\u6027\u80fd\uff0cLevelDB\u5e38\u88ab\u7528\u4f5c\u6578\u64da\u7de9\u5b58\u7cfb\u7d71\uff0c\u80fd\u5920\u5feb\u901f\u5b58\u53d6\u983b\u7e41\u4f7f\u7528\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u65e5\u8a8c\u5b58\u5132\uff1a<\/strong>LevelDB\u975e\u5e38\u9069\u5408\u7528\u65bc\u5b58\u5132\u65e5\u8a8c\u6578\u64da\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u5927\u91cf\u7684\u5beb\u5165\u8acb\u6c42\u3002<\/li>\n<li><strong>\u5d4c\u5165\u5f0f\u7cfb\u7d71\uff1a<\/strong>\u5728\u5d4c\u5165\u5f0f\u7cfb\u7d71\u4e2d\uff0cLevelDB\u56e0\u5176\u8f15\u91cf\u7d1a\u548c\u9ad8\u6548\u80fd\u800c\u53d7\u5230\u9752\u775e\uff0c\u9069\u5408\u7528\u65bc\u8cc7\u6e90\u6709\u9650\u7684\u74b0\u5883\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8leveldb-wvlPkXGImE\">\u5982\u4f55\u4f7f\u7528LevelDB<\/h2>\n<p>\u4f7f\u7528LevelDB\u975e\u5e38\u7c21\u55ae\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>\n#include \"leveldb\/db.h\"\n#include \"leveldb\/write_batch.h\"\n\nint main() {\n    leveldb::DB* db;\n    leveldb::Options options;\n    options.create_if_missing = true;\n\n    \/\/ \u6253\u958b\u6578\u64da\u5eab\n    leveldb::Status status = leveldb::DB::Open(options, \"testdb\", &amp;db);\n    if (!status.ok()) {\n        std::cerr &lt;&lt; \"Unable to open\/create test database: \" &lt;&lt; status.ToString() &lt;&lt; std::endl;\n        return 1;\n    }\n\n    \/\/ \u5beb\u5165\u6578\u64da\n    db-&gt;Put(leveldb::WriteOptions(), \"key1\", \"value1\");\n    db-&gt;Put(leveldb::WriteOptions(), \"key2\", \"value2\");\n\n    \/\/ \u8b80\u53d6\u6578\u64da\n    std::string value;\n    status = db-&gt;Get(leveldb::ReadOptions(), \"key1\", &amp;value);\n    if (status.ok()) {\n        std::cout &lt;&lt; \"Retrieved value: \" &lt;&lt; value &lt;&lt; std::endl;\n    }\n\n    \/\/ \u95dc\u9589\u6578\u64da\u5eab\n    delete db;\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-wvlPkXGImE\">\u7e3d\u7d50<\/h2>\n<p>LevelDB\u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684K\/V\u6578\u64da\u5eab\uff0c\u56e0\u5176\u5353\u8d8a\u7684\u5beb\u5165\u6027\u80fd\u3001\u53ef\u64f4\u5c55\u6027\u548c\u7c21\u55ae\u7684API\u800c\u53d7\u5230\u5ee3\u6cdb\u61c9\u7528\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u7de9\u5b58\u3001\u65e5\u8a8c\u5b58\u5132\u9084\u662f\u5d4c\u5165\u5f0f\u7cfb\u7d71\u4e2d\uff0cLevelDB\u90fd\u80fd\u63d0\u4f9b\u512a\u7570\u7684\u6027\u80fd\u8868\u73fe\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0cLevelDB\u7121\u7591\u662f\u4e00\u500b\u503c\u5f97\u8003\u616e\u7684\u9078\u64c7\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u90e8\u7f72\u60a8\u7684\u61c9\u7528\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LevelDB\u662f\u4e00\u6b3e\u8d85\u9ad8\u6027\u80fd\u7684K\/V\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u5feb\u901f\u7684\u8b80\u5beb\u64cd\u4f5c\uff0c\u9069\u5408\u9ad8\u6548\u80fd\u61c9\u7528\u548c\u6578\u64da\u5b58\u5132\u9700\u6c42\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-62271","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62271","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=62271"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62271\/revisions"}],"predecessor-version":[{"id":62272,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62271\/revisions\/62272"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}