{"id":158141,"date":"2024-11-03T00:20:20","date_gmt":"2024-11-02T16:20:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/158141\/"},"modified":"2024-11-03T00:20:21","modified_gmt":"2024-11-02T16:20:21","slug":"%e9%ab%98%e6%95%88%e7%ae%a1%e7%90%86%e6%95%b8%e6%93%9a%ef%bc%9amap-%e4%b8%80%e6%ac%a1%e5%8a%a0%e8%bc%89%e5%a4%9a%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%88map-%e4%b8%80%e6%ac%a1%e5%8a%a0%e8%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/158141\/","title":{"rendered":"\u9ad8\u6548\u7ba1\u7406\u6578\u64da\uff1amap \u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff08map \u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 id=\"%e9%ab%98%e6%95%88%e7%ae%a1%e7%90%86%e6%95%b8%e6%93%9a%ef%bc%9amap-%e4%b8%80%e6%ac%a1%e5%8a%a0%e8%bc%89%e5%a4%9a%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab-heAMsrIcKN\">\u9ad8\u6548\u7ba1\u7406\u6578\u64da\uff1amap \u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\u5c0d\u65bc\u4f01\u696d\u7684\u6210\u529f\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u6fc0\u589e\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u7ba1\u7406\u548c\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\u6210\u70ba\u4e86\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u79d1\u5b78\u5bb6\u7684\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 <code>map<\/code> \u51fd\u6578\u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-map-%e5%87%bd%e6%95%b8%ef%bc%9f-heAMsrIcKN\">\u4ec0\u9ebc\u662f map \u51fd\u6578\uff1f<\/h2>\n<p><code>map<\/code> \u51fd\u6578\u662f\u4e00\u7a2e\u9ad8\u968e\u51fd\u6578\uff0c\u901a\u5e38\u7528\u65bc\u5c0d\u96c6\u5408\u4e2d\u7684\u6bcf\u500b\u5143\u7d20\u61c9\u7528\u4e00\u500b\u51fd\u6578\uff0c\u4e26\u8fd4\u56de\u4e00\u500b\u65b0\u7684\u96c6\u5408\u3002\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c<code>map<\/code> \u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u7c21\u5316\u5c0d\u591a\u500b\u6578\u64da\u5eab\u7684\u64cd\u4f5c\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5f9e\u591a\u500b\u6578\u64da\u6e90\u63d0\u53d6\u6578\u64da\u6642\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e8%a6%81%e4%b8%80%e6%ac%a1%e5%8a%a0%e8%bc%89%e5%a4%9a%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-heAMsrIcKN\">\u70ba\u4ec0\u9ebc\u8981\u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff1f<\/h2>\n<ul>\n<li><strong>\u63d0\u9ad8\u6548\u7387\uff1a<\/strong>\u4e00\u6b21\u6027\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\u53ef\u4ee5\u6e1b\u5c11\u591a\u6b21\u9023\u63a5\u7684\u958b\u92b7\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002<\/li>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u4f7f\u7528 <code>map<\/code> \u51fd\u6578\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u52a0\u7c21\u6f54\uff0c\u6613\u65bc\u7dad\u8b77\u3002<\/li>\n<li><strong>\u7d71\u4e00\u6578\u64da\u8655\u7406\uff1a<\/strong>\u901a\u904e\u7d71\u4e00\u7684\u63a5\u53e3\u4f86\u8655\u7406\u591a\u500b\u6578\u64da\u5eab\uff0c\u53ef\u4ee5\u6e1b\u5c11\u932f\u8aa4\u4e26\u63d0\u9ad8\u6578\u64da\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-map-%e5%87%bd%e6%95%b8%e5%8a%a0%e8%bc%89%e5%a4%9a%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab-heAMsrIcKN\">\u5982\u4f55\u4f7f\u7528 map \u51fd\u6578\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Python \u548c SQLAlchemy \u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 <code>map<\/code> \u51fd\u6578\u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\u3002<\/p>\n<pre><code>from sqlalchemy import create_engine\nfrom sqlalchemy.orm import sessionmaker\n\n# \u5b9a\u7fa9\u6578\u64da\u5eab\u9023\u63a5\u5b57\u7b26\u4e32\ndatabases = [\n    \"mysql+pymysql:\/\/user:password@localhost\/db1\",\n    \"mysql+pymysql:\/\/user:password@localhost\/db2\",\n    \"mysql+pymysql:\/\/user:password@localhost\/db3\"\n]\n\n# \u5275\u5efa\u4e00\u500b\u5f15\u64ce\ndef create_session(db_url):\n    engine = create_engine(db_url)\n    Session = sessionmaker(bind=engine)\n    return Session()\n\n# \u4f7f\u7528 map \u51fd\u6578\u5275\u5efa\u591a\u500b\u6703\u8a71\nsessions = list(map(create_session, databases))\n\n# \u73fe\u5728\u53ef\u4ee5\u4f7f\u7528 sessions \u4f86\u64cd\u4f5c\u591a\u500b\u6578\u64da\u5eab\nfor session in sessions:\n    # \u9032\u884c\u6578\u64da\u67e5\u8a62\u6216\u64cd\u4f5c\n    results = session.query(SomeModel).all()\n    print(results)\n<\/code><\/pre>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-heAMsrIcKN\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u932f\u8aa4\u8655\u7406\uff1a<\/strong>\u5728\u8655\u7406\u591a\u500b\u6578\u64da\u5eab\u6642\uff0c\u52d9\u5fc5\u8003\u616e\u932f\u8aa4\u8655\u7406\u6a5f\u5236\uff0c\u4ee5\u9632\u67d0\u500b\u6578\u64da\u5eab\u51fa\u73fe\u554f\u984c\u5f71\u97ff\u6574\u9ad4\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u6027\u80fd\u76e3\u63a7\uff1a<\/strong>\u5b9a\u671f\u76e3\u63a7\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u78ba\u4fdd\u52a0\u8f09\u904e\u7a0b\u4e0d\u6703\u9020\u6210\u74f6\u9838\u3002<\/li>\n<li><strong>\u8cc7\u6e90\u7ba1\u7406\uff1a<\/strong>\u78ba\u4fdd\u5728\u64cd\u4f5c\u5b8c\u6210\u5f8c\u6b63\u78ba\u95dc\u9589\u6703\u8a71\uff0c\u4ee5\u91cb\u653e\u8cc7\u6e90\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-heAMsrIcKN\">\u7d50\u8ad6<\/h2>\n<p>\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u662f\u73fe\u4ee3\u4f01\u696d\u6210\u529f\u7684\u95dc\u9375\u4e4b\u4e00\u3002\u901a\u904e\u4f7f\u7528 <code>map<\/code> \u51fd\u6578\u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\uff0c\u7c21\u5316\u4ee3\u78bc\u7d50\u69cb\uff0c\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u96a8\u8457\u6280\u8853\u7684\u9032\u6b65\uff0c\u9019\u7a2e\u65b9\u6cd5\u5c07\u5728\u6578\u64da\u7ba1\u7406\u4e2d\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u7ba1\u7406\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u52a0\u8f09\u6578\u64da\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9ad8\u6548\u7ba1\u7406\u6578\u64da\uff0c\u900f\u904e\u4e00\u6b21\u52a0\u8f09\u591a\u500b\u6578\u64da\u5eab\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u5de5\u4f5c\u6d41\u7a0b\uff0c\u5be6\u73fe\u667a\u80fd\u5316\u6578\u64da\u7ba1\u7406\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-158141","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158141","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=158141"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158141\/revisions"}],"predecessor-version":[{"id":158142,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158141\/revisions\/158142"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=158141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=158141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=158141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}