{"id":59699,"date":"2024-10-13T00:04:18","date_gmt":"2024-10-12T16:04:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/59699\/"},"modified":"2024-10-13T00:04:18","modified_gmt":"2024-10-12T16:04:18","slug":"c%e8%aa%9e%e8%a8%80%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%e4%b8%8b%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3%e6%8e%a5%e7%ae%a1%e7%90%86-c%e5%96%ae%e4%be%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/59699\/","title":{"rendered":"C\u8a9e\u8a00\u55ae\u4f8b\u6a21\u5f0f\u4e0b\u7684\u6578\u64da\u5eab\u9023\u63a5\u7ba1\u7406 (c\u55ae\u4f8b\u6578\u64da\u5eab\u9023\u63a5)"},"content":{"rendered":"<h1 id=\"c%e8%aa%9e%e8%a8%80%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%e4%b8%8b%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3%e6%8e%a5%e7%ae%a1%e7%90%86-gNkRBXglLh\">C\u8a9e\u8a00\u55ae\u4f8b\u6a21\u5f0f\u4e0b\u7684\u6578\u64da\u5eab\u9023\u63a5\u7ba1\u7406<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u9023\u63a5\u7684\u7ba1\u7406\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u8ab2\u984c\u3002\u5c24\u5176\u662f\u5728\u9ad8\u4e26\u767c\u7684\u74b0\u5883\u4e0b\uff0c\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728C\u8a9e\u8a00\u4e2d\u4f7f\u7528\u55ae\u4f8b\u6a21\u5f0f\u4f86\u5be6\u73fe\u6578\u64da\u5eab\u9023\u63a5\u7ba1\u7406\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%ef%bc%9f-gNkRBXglLh\">\u4ec0\u9ebc\u662f\u55ae\u4f8b\u6a21\u5f0f\uff1f<\/h2>\n<p>\u55ae\u4f8b\u6a21\u5f0f\u662f\u4e00\u7a2e\u8a2d\u8a08\u6a21\u5f0f\uff0c\u65e8\u5728\u78ba\u4fdd\u4e00\u500b\u985e\u53ea\u6709\u4e00\u500b\u5be6\u4f8b\uff0c\u4e26\u63d0\u4f9b\u4e00\u500b\u5168\u5c40\u8a2a\u554f\u9ede\u3002\u9019\u5728\u9700\u8981\u63a7\u5236\u8cc7\u6e90\u7684\u60c5\u6cc1\u4e0b\u7279\u5225\u6709\u7528\uff0c\u4f8b\u5982\u6578\u64da\u5eab\u9023\u63a5\u3002\u901a\u904e\u4f7f\u7528\u55ae\u4f8b\u6a21\u5f0f\uff0c\u6211\u5011\u53ef\u4ee5\u907f\u514d\u591a\u500b\u5be6\u4f8b\u540c\u6642\u6253\u958b\u6578\u64da\u5eab\u9023\u63a5\uff0c\u5f9e\u800c\u6e1b\u5c11\u8cc7\u6e90\u7684\u6d6a\u8cbb\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e4%bd%bf%e7%94%a8%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3%e6%8e%a5%e7%ae%a1%e7%90%86%ef%bc%9f-gNkRBXglLh\">\u70ba\u4ec0\u9ebc\u4f7f\u7528\u55ae\u4f8b\u6a21\u5f0f\u9032\u884c\u6578\u64da\u5eab\u9023\u63a5\u7ba1\u7406\uff1f<\/h2>\n<ul>\n<li><strong>\u8cc7\u6e90\u7bc0\u7701\uff1a<\/strong>\u6bcf\u6b21\u5275\u5efa\u6578\u64da\u5eab\u9023\u63a5\u90fd\u9700\u8981\u6d88\u8017\u7cfb\u7d71\u8cc7\u6e90\uff0c\u4f7f\u7528\u55ae\u4f8b\u6a21\u5f0f\u53ef\u4ee5\u91cd\u7528\u5df2\u6709\u7684\u9023\u63a5\u3002<\/li>\n<li><strong>\u6027\u80fd\u63d0\u5347\uff1a<\/strong>\u6e1b\u5c11\u4e86\u9023\u63a5\u7684\u5275\u5efa\u548c\u92b7\u6bc0\u6642\u9593\uff0c\u63d0\u9ad8\u4e86\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/li>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u901a\u904e\u96c6\u4e2d\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u5f97\u4ee5\u63d0\u9ad8\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%af%a6%e7%8f%be-gNkRBXglLh\">\u55ae\u4f8b\u6a21\u5f0f\u7684\u5be6\u73fe<\/h2>\n<p>\u5728C\u8a9e\u8a00\u4e2d\uff0c\u5be6\u73fe\u55ae\u4f8b\u6a21\u5f0f\u901a\u5e38\u6d89\u53ca\u5230\u975c\u614b\u8b8a\u91cf\u548c\u51fd\u6578\u6307\u91dd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728C\u8a9e\u8a00\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u9023\u63a5\u7684\u55ae\u4f8b\u6a21\u5f0f\uff1a<\/p>\n<pre><code>\n#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n\ntypedef struct {\n    \/\/ \u6578\u64da\u5eab\u9023\u63a5\u7684\u5c6c\u6027\n    char *connectionString;\n} DatabaseConnection;\n\nDatabaseConnection* getDatabaseConnection() {\n    static DatabaseConnection *instance = NULL;\n\n    if (instance == NULL) {\n        instance = (DatabaseConnection *)malloc(sizeof(DatabaseConnection));\n        instance-&gt;connectionString = \"Database=example;User Id=user;Password=pass;\";\n        \/\/ \u5728\u9019\u88e1\u53ef\u4ee5\u6dfb\u52a0\u66f4\u591a\u7684\u521d\u59cb\u5316\u4ee3\u78bc\n        printf(\"\u6578\u64da\u5eab\u9023\u63a5\u5df2\u5275\u5efa\u3002n\");\n    }\n    return instance;\n}\n\nint main() {\n    DatabaseConnection *db1 = getDatabaseConnection();\n    DatabaseConnection *db2 = getDatabaseConnection();\n\n    if (db1 == db2) {\n        printf(\"db1 \u548c db2 \u662f\u540c\u4e00\u500b\u5be6\u4f8b\u3002n\");\n    }\n\n    \/\/ \u91cb\u653e\u8cc7\u6e90\n    free(db1);\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"%e4%bb%a3%e7%a2%bc%e8%a7%a3%e6%9e%90-gNkRBXglLh\">\u4ee3\u78bc\u89e3\u6790<\/h2>\n<p>\u5728\u4e0a\u8ff0\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba <code>DatabaseConnection<\/code> \u7684\u7d50\u69cb\u9ad4\uff0c\u4e26\u4f7f\u7528\u975c\u614b\u8b8a\u91cf <code>instance<\/code> \u4f86\u5b58\u5132\u6578\u64da\u5eab\u9023\u63a5\u7684\u552f\u4e00\u5be6\u4f8b\u3002\u7576\u7b2c\u4e00\u6b21\u8abf\u7528 <code>getDatabaseConnection<\/code> \u51fd\u6578\u6642\uff0c\u6703\u5275\u5efa\u4e00\u500b\u65b0\u7684\u6578\u64da\u5eab\u9023\u63a5\u5be6\u4f8b\uff0c\u96a8\u5f8c\u7684\u8abf\u7528\u5c07\u8fd4\u56de\u76f8\u540c\u7684\u5be6\u4f8b\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-gNkRBXglLh\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u55ae\u4f8b\u6a21\u5f0f\u5728\u6578\u64da\u5eab\u9023\u63a5\u7ba1\u7406\u4e2d\u6709\u5176\u512a\u52e2\uff0c\u4f46\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u7dda\u7a0b\u5b89\u5168\uff1a<\/strong>\u5728\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\uff0c\u5fc5\u9808\u78ba\u4fdd\u55ae\u4f8b\u7684\u5be6\u73fe\u662f\u7dda\u7a0b\u5b89\u5168\u7684\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<li><strong>\u8cc7\u6e90\u91cb\u653e\uff1a<\/strong>\u5728\u61c9\u7528\u7a0b\u5e8f\u7d50\u675f\u6642\uff0c\u61c9\u78ba\u4fdd\u91cb\u653e\u6578\u64da\u5eab\u9023\u63a5\u6240\u4f54\u7528\u7684\u8cc7\u6e90\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gNkRBXglLh\">\u7e3d\u7d50<\/h2>\n<p>\u5728C\u8a9e\u8a00\u4e2d\u4f7f\u7528\u55ae\u4f8b\u6a21\u5f0f\u4f86\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\u662f\u4e00\u7a2e\u6709\u6548\u7684\u8a2d\u8a08\u9078\u64c7\u3002\u5b83\u4e0d\u50c5\u80fd\u5920\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u9084\u80fd\u7c21\u5316\u4ee3\u78bc\u7684\u7d50\u69cb\u3002\u901a\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u5be6\u73fe\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u9ad8\u4e26\u767c\u7684\u74b0\u5883\u4e2d\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u6548\u7387\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\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22C\u8a9e\u8a00\u4e2d\u7684\u55ae\u4f8b\u6a21\u5f0f\u5982\u4f55\u6709\u6548\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u63d0\u5347\u6027\u80fd\u8207\u8cc7\u6e90\u5229\u7528\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\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-59699","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59699","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=59699"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59699\/revisions"}],"predecessor-version":[{"id":59700,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59699\/revisions\/59700"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=59699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=59699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=59699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}