{"id":207870,"date":"2025-07-08T13:13:59","date_gmt":"2025-07-08T05:13:59","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207870\/"},"modified":"2025-07-08T13:13:59","modified_gmt":"2025-07-08T05:13:59","slug":"%e5%b7%b2%e8%bf%9e%e6%8e%a5%e5%88%b0-postgres-%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%8c%e4%bd%86%e6%8b%92%e7%bb%9d%e4%bb%8e%e6%95%b0%e6%8d%ae%e5%ba%93student%e7%9a%84%e8%a1%a8stu","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207870\/","title":{"rendered":"\u5df2\u8fde\u63a5\u5230 postgres \u670d\u52a1\u5668\uff0c\u4f46\u62d2\u7edd\u4ece\u6570\u636e\u5e93\u201cstudent\u201d\u7684\u8868\u201cstudents\u201d\u4e2d\u83b7\u53d6\u6570\u636e"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u5df2\u8fde\u63a5\u5230 postgres \u670d\u52a1\u5668\uff0c\u4f46\u62d2\u7edd\u4ece\u6570\u636e\u5e93\u201cstudent\u201d\u7684\u8868\u201cstudents\u201d\u4e2d\u83b7\u53d6\u6570\u636e<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-26 11:00:28<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5df2\u8fde\u63a5\u5230 postgres \u670d\u52a1\u5668\uff0c\u4f46\u62d2\u7edd\u4ece\u6570\u636e\u5e93\u201cstudent\u201d\u7684\u8868\u201cstudents\u201d\u4e2d\u83b7\u53d6\u6570\u636e\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<pre>package main\n\nimport (\n    \"database\/sql\"\n    \"encoding\/json\"\n    \"fmt\"\n    \"log\"\n    \"net\/http\"\n\n    \"github.com\/gorilla\/mux\"\n    _ \"github.com\/lib\/pq\"\n)\n\nfunc logfatal(err error) {\n    if err != nil {\n        log.fatal(err)\n    }\n}\n\nconst (\n    host     = \"localhost\"\n    port     = 5432\n    user     = \"blablabla\"\n    password = \"\"\n    dbname   = \"student\"\n)\n\ntype student struct {\n    id          int    `json:\"id\"`\n    name        string `json:\"name\"`\n    department  string `json:\"department\"`\n    year_joined string `json:\"year_joined\"`\n}\n\nvar students []student\n\nvar db *sql.db\n\nfunc main() {\n\n    psqlinfo := fmt.sprintf(\"host=%s port=%d user=%s \"+\n        \"password=%s dbname=%s sslmode=disable\",\n        host, port, user, password, dbname)\n\n    var err error\n\n    db, err = sql.open(\"postgres\", psqlinfo)\n    logfatal(err)\n\n    err = db.ping()\n    if err != nil {\n        log.fatal(err)\n    }\n\n    fmt.println(\"connected\")\n\n    router := mux.newrouter()\n    router.handlefunc(\"\/students\", getstudents).methods(\"get\")\n\n    log.fatal(http.listenandserve(\":8000\", router))\n\n}\n\nfunc getstudents(w http.responsewriter, r *http.request) {\n    var thestudent student\n\n    students = []student{}\n\n    rows, err := db.query(\"select * from students\")\n\n    if err != nil {\n        fmt.print(\"there was an error\", err)\n    }\n\n    for rows.next() {\n        err := rows.scan(&amp;thestudent.id, &amp;thestudent.name, &amp;thestudent.department, &amp;thestudent.year_joined)\n\n        if err != nil {\n            log.fatal(err)\n        }\n        students = append(students, thestudent)\n\n    }\n\n    json.newencoder(w).encode(students)\n\n}<\/pre>\n<p>\u8fd9\u662f\u6570\u636e\u5e93<\/p>\n<pre>last login: sat may 29 07:24:12 on ttys003\n\/applications\/postgres.app\/contents\/versions\/11\/bin\/psql -p5432 \"student\"\n ~ \ue0b0 \ue0a0 new-feature \u25cf \ue0b0 \/applications\/postgres.app\/contents\/versions\/11\/bin\/psql -p5432 \"student\"\npsql (11.2)\ntype \"help\" for help.\n\nstudent=# select * from students;\n id | name  | department | year_joined \n----+-------+------------+-------------\n  1 | ola   | csc        | 1990\n  2 | kenny | math       | 2019\n(2 rows)\n\nstudent=#<\/pre>\n<p>\u8fd9\u662f\u4ece vscode \u7ec8\u7aef\u5f97\u5230\u7684\u7ed3\u679c<\/p>\n<pre>Connected\nthere was an error pq: relation \"students\" does not exist&lt;nil&gt;`enter code here`<\/pre>\n<p> <\/p>\n<h2>\u6b63\u786e\u7b54\u6848<\/h2>\n<p> <\/p>\n<p>\u7ecf\u8fc7\u9010\u884c\u8c03\u8bd5\uff0c\u6211\u610f\u8bc6\u5230\u4e0e\u6570\u636e\u5e93\u7684\u8fde\u63a5\u6709\u6548\uff0c\u4f46\u95ee\u9898\u51fa\u5728 postgresql \u8bed\u6cd5\u4e0a\uff0c\u8be5\u8bed\u6cd5\u5e94\u8be5\u662f\u201cselect<em>from from table\u201d\u800c\u4e0d\u662f\u201cselect * from table\u201d\u3002\u610f\u5473\u7740\u5b83\u4e0d\u652f\u6301 select \u548c (<\/em>) \u548c (*) from from \u4e4b\u95f4\u6709\u7a7a\u683c\u3002\u8c22\u8c22<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8eGolang\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207870","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207870","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=207870"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207870\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207870"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}