{"id":207409,"date":"2025-07-08T09:37:10","date_gmt":"2025-07-08T01:37:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207409\/"},"modified":"2025-07-08T09:37:10","modified_gmt":"2025-07-08T01:37:10","slug":"%e6%97%a0%e6%b3%95%e5%9c%a8-golang-%e4%b8%ad%e5%af%b9%e6%95%b0%e6%8d%ae%e5%ad%98%e5%82%a8%e7%b1%bb%e5%9e%8b%e7%9a%84%e5%ae%9e%e4%bd%93%e8%bf%9b%e8%a1%8c%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207409\/","title":{"rendered":"\u65e0\u6cd5\u5728 golang \u4e2d\u5bf9\u6570\u636e\u5b58\u50a8\u7c7b\u578b\u7684\u5b9e\u4f53\u8fdb\u884c\u6392\u5e8f"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u65e0\u6cd5\u5728 golang \u4e2d\u5bf9\u6570\u636e\u5b58\u50a8\u7c7b\u578b\u7684\u5b9e\u4f53\u8fdb\u884c\u6392\u5e8f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 12:57:33<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300a\u65e0\u6cd5\u5728 golang \u4e2d\u5bf9\u6570\u636e\u5b58\u50a8\u7c7b\u578b\u7684\u5b9e\u4f53\u8fdb\u884c\u6392\u5e8f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60Golang<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591aGolang<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5728\u6211\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4f7f\u7528 go 1.11 \u4f5c\u4e3a\u540e\u7aef\u3002\u5b83\u5728 google \u6570\u636e\u5b58\u50a8\u4e2d\u6267\u884c crud \u64cd\u4f5c\u3002\u6211\u53ef\u4ee5\u4ece\u7279\u5b9a\u7c7b\u578b\u4e2d\u68c0\u7d22\u5b9e\u4f53\uff0c\u4f46\u987a\u5e8f\u4e0d\u53ef\u9884\u6d4b\u3002\u6211\u6b63\u5728\u4f7f\u7528\u4ee5\u4e0b\u6570\u636e\u5b58\u50a8\u6a21\u5757\uff1a<\/p>\n

\"cloud.google.com\/go\/datastore\"<\/pre>\n
\u6211\u7684\u7ed3\u6784\u662f\uff1a<\/p>\n
type ruleds struct {\n    id              string          `json:\"id\" datastore:\"id\"`\n    name            string          `json:\"name\" datastore:\"name\"`\n    salience        int             `json:\"salience\" datastore:\"salience\"`\n    createdat       time.time       `json:\"createdat\" datastore:\"createdat\"`\n}<\/pre>\n
\u6211\u6309\u987a\u5e8f\u5bf9\u5b9e\u4f53\u8fdb\u884c\u6392\u5e8f\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
var rulesdsarr  []ruleds\n    query := datastore.newquery(\"rule\").order(\"-salience\")\n    _, errds := s.datalayer.getall(ctx, query, &rulesdsarr)\n    if errds!= nil{\n      log.errorf(ctx,\"error while getting rules : %v\",errds)\n    }<\/pre>\n
\u6211\u8fd8\u68c0\u67e5\u4e86\u5f62\u6210\u67e5\u8be2\u7684\u65e5\u5fd7\uff1a<\/p>\n
&{kind:Rule ancestor:<nil> filter:[] order:[{FieldName:Salience Direction:true}] projection:[] distinct:false distinctOn:[] keysOnly:false eventual:false limit:-1 offset:0 start:[] end:[] namespace: trans:<nil> err:<nil>}<\/pre>\n
\u5728\u8c37\u6b4c\u6570\u636e\u5b58\u50a8\u4e2d\uff0c\u6211\u5c1d\u8bd5\u8fc7\u5c06 salience \u5c5e\u6027\u8bbe\u7f6e\u4e3a\u7d22\u5f15\u548c\u975e\u7d22\u5f15\uff0c\u4f46\u5bf9\u6211\u6765\u8bf4\u6ca1\u6709\u4efb\u4f55\u4f5c\u7528\u3002\u6211\u4e0d\u77e5\u9053\u6211\u5728\u8fd9\u91cc\u505a\u9519\u4e86\u4ec0\u4e48\uff0c\u56e0\u6b64\u6211\u5f97\u5230\u4e86\u7a7a\u503c\u3002\u5982\u679c\u6211\u4ece\u67e5\u8be2\u8bed\u53e5\u4e2d\u5220\u9664 .order(\"-salience\")<\/code>\uff0c\u6211\u4f1a\u518d\u6b21\u83b7\u5f97\u6240\u6709\u89c4\u5219\u3002<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u542c\u8d77\u6765\u60a8\u6ca1\u6709\u4efb\u4f55\u663e\u7740\u6027\u503c\u88ab\u7d22\u5f15\u3002 .Order(\"-Salience\")<\/code> \u4f7f\u7528 Salience \u503c\u7684\u7d22\u5f15\uff0c\u56e0\u6b64\u4efb\u4f55\u6ca1\u6709 Salience \u7d22\u5f15\u503c\u7684\u5b9e\u4f53\u90fd\u4e0d\u4f1a\u663e\u793a\u5728\u7ed3\u679c\u4e2d\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cCloud Datastore \u4e2d\u7684\u503c\u4f3c\u4e4e\u662f salience<\/code>\uff0c\u56e0\u6b64\u60a8\u5e94\u8be5\u5c1d\u8bd5 .Order(\"-Salience\")<\/code>\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u5728\u4e91\u63a7\u5236\u53f0\u4e2d\u5c1d\u8bd5\u7684\u64cd\u4f5c\uff1a<\/p>\n
    \n
  • select * \u6309\u663e\u7740\u6027 desc<\/code> \u7684\u89c4\u5219\u987a\u5e8f<\/li>\n
  • select * \u6839\u636e Salience desc<\/code> \u7684\u89c4\u5219\u987a\u5e8f<\/li>\n<\/ul>\n
    \u5982\u679c\u4e24\u8005\u90fd\u6ca1\u6709\u7ed9\u51fa\u7ed3\u679c\uff0c\u90a3\u4e48\u60a8\u6ca1\u6709\u4efb\u4f55\u663e\u7740\u6027\u503c\u88ab\u7d22\u5f15\uff0c\u60a8\u5c06\u4e0d\u5f97\u4e0d\u91cd\u5199\u60a8\u7684\u5b9e\u4f53\u3002<\/p>\n
    \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u65e0\u6cd5\u5728 golang \u4e2d\u5bf9\u6570\u636e\u5b58\u50a8\u7c7b\u578b\u7684\u5b9e\u4f53\u8fdb\u884c\u6392\u5e8f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/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-207409","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207409","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=207409"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207409\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}