{"id":200883,"date":"2025-05-06T12:56:44","date_gmt":"2025-05-06T04:56:44","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200883\/"},"modified":"2025-05-06T12:56:44","modified_gmt":"2025-05-06T04:56:44","slug":"go%e8%af%ad%e8%a8%80%e5%87%bd%e6%95%b0%e4%b8%ad%e6%8c%87%e9%92%88%e8%b5%8b%e5%80%bc%e4%b8%ba%e4%bd%95%e5%a4%b1%e6%95%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200883\/","title":{"rendered":"Go\u8bed\u8a00\u51fd\u6570\u4e2d\u6307\u9488\u8d4b\u503c\u4e3a\u4f55\u5931\u6548\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Go\u8bed\u8a00\u51fd\u6570\u4e2d\u6307\u9488\u8d4b\u503c\u4e3a\u4f55\u5931\u6548\uff1f<\/h1>\n

\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n

<\/p>\n

\u6307\u9488\u8d4b\u503c\u4e3a\u4f55\u5931\u6548<\/strong><\/p>\n

\u4e3a\u4ec0\u4e48\u5728go\u4e2d\uff0c\u5c06\u6307\u9488\u53d8\u91cf\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\uff0c\u51fd\u6570\u5185\u5bf9\u6307\u9488\u503c\u8fdb\u884c\u4fee\u6539\u540e\uff0c\u5916\u90e8\u65e0\u6cd5\u83b7\u53d6\u4fee\u6539\u540e\u7684\u503c\uff1f<\/p>\n

\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n

var db *sql.DB\n\nfunc main() {\n    initDB(db)\n\n    fmt.Println(db) \/\/ \u8f93\u51fa <nil>\n}\n\nfunc initDB(db *sql.DB) {\n    db, err := sql.Open(\"mysql\", \"root:123456@tcp(127.0.0.1:3306)\/data\")\n    checkErr(err)\n\n    db.SetMaxOpenConns(100)\n    db.SetMaxIdleConns(100)\n    db.SetConnMaxLifetime(time.Minute * 3)\n\n    if err := db.Ping(); err != nil {\n        checkErr(err)\n    }\n\n    fmt.Println(db) \/\/ \u8f93\u51fa\u6b63\u786e\u7684\u503c\n}<\/pre>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cmain() \u4e2d\u8f93\u51fa db \u4e3a <nil>\uff0c\u5373\u4f7f initdb() \u4e2d\u5df2\u6210\u529f\u4e3a db \u8d4b\u503c\u3002\u8fd9\u662f\u56e0\u4e3a\uff1a<\/p>\n
go \u4e2d\u5c40\u90e8\u53d8\u91cf\u7684\u8986\u76d6<\/strong><\/p>\n
go \u8bed\u8a00\u4e2d\uff0c\u51fd\u6570\u5185\u7684\u5c40\u90e8\u53d8\u91cf\u540d\u4f1a\u8986\u76d6\u51fd\u6570\u53c2\u6570\u7684\u540d\u79f0\u3002\u8fd9\u610f\u5473\u7740 initdb() \u4e2d\u58f0\u660e\u7684\u53d8\u91cf db \u4e0e main() \u4e2d\u7684\u53d8\u91cf db \u662f\u4e0d\u540c\u7684\u53d8\u91cf\u3002<\/p>\n
initdb() \u4e2d\uff0c\u51fd\u6570\u5c06\u4e00\u4e2a\u65b0\u7684\u503c\u5206\u914d\u7ed9\u4e86\u5c40\u90e8\u53d8\u91cf db\uff0c\u4f46\u5e76\u672a\u4fee\u6539\u51fd\u6570\u53c2\u6570 db \u6307\u5411\u7684\u5bf9\u8c61\u3002\u56e0\u6b64\uff0cmain() \u4e2d\u7684\u53d8\u91cf db \u4ecd\u7136\u4fdd\u7559\u7740\u521d\u59cb\u5316\u65f6\u7684 <nil> \u503c\u3002<\/p>\n
\u8981\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n
    \n
  • \u4f7f\u7528\u6307\u9488\u63a5\u6536\u5668\uff1a\u5141\u8bb8\u51fd\u6570\u4fee\u6539\u51fd\u6570\u53c2\u6570\u6307\u5411\u7684\u5bf9\u8c61\u3002<\/li>\n
  • \u4fee\u6539\u51fd\u6570\u7684\u53c2\u6570\uff1a\u5c06\u53c2\u6570\u7c7b\u578b\u4ece *t \u4fee\u6539\u4e3a t\uff0c\u76f4\u63a5\u8fd4\u56de\u65b0\u7684\u503c\u3002<\/li>\n<\/ul>\n
    \u901a\u8fc7\u91c7\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u5185\u548c\u51fd\u6570\u5916\u4fee\u6539\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u7684\u503c\u3002<\/p>\n
    \u4eca\u5929\u5173\u4e8e\u300aGo\u8bed\u8a00\u51fd\u6570\u4e2d\u6307\u9488\u8d4b\u503c\u4e3a\u4f55\u5931\u6548\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    Go\u8bed\u8a00\u51fd\u6570\u4e2d\u6307\u9488\u8d4b\u503c\u4e3a\u4f55\u5931\u6548\uff1f...<\/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-200883","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200883","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=200883"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200883\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}