{"id":206992,"date":"2025-07-08T09:11:08","date_gmt":"2025-07-08T01:11:08","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206992\/"},"modified":"2025-07-08T09:11:08","modified_gmt":"2025-07-08T01:11:08","slug":"golang%ef%bc%88%e5%b8%a6-gocql-%e9%a9%b1%e5%8a%a8%e7%a8%8b%e5%ba%8f%ef%bc%89%e6%9c%aa%e8%bf%94%e5%9b%9e-cassandra-db-%e4%b8%ad%e7%9a%84%e6%89%80%e6%9c%89%e6%9d%a1%e7%9b%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206992\/","title":{"rendered":"Golang\uff08\u5e26 gocql \u9a71\u52a8\u7a0b\u5e8f\uff09\u672a\u8fd4\u56de Cassandra DB \u4e2d\u7684\u6240\u6709\u6761\u76ee"},"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>Golang\uff08\u5e26 gocql \u9a71\u52a8\u7a0b\u5e8f\uff09\u672a\u8fd4\u56de Cassandra DB \u4e2d\u7684\u6240\u6709\u6761\u76ee<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-19 12:18:37<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aGolang\uff08\u5e26 gocql \u9a71\u52a8\u7a0b\u5e8f\uff09\u672a\u8fd4\u56de Cassandra DB \u4e2d\u7684\u6240\u6709\u6761\u76ee\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u5728 cassandra \u7684 <code>gocql<\/code> \u9a71\u52a8\u7a0b\u5e8f\u6216 cassandra \u6570\u636e\u5e93\u672c\u8eab\u4e2d\u53d1\u73b0\u4e86\u4e00\u4e2a\u5947\u602a\u7684\u9519\u8bef\u3002<\/p>\n<p>\u6211\u6b63\u5728\u5c1d\u8bd5\u8fdb\u884c\u7b80\u5355\u7684\u5199\u5165\uff0c\u7136\u540e\u5728\u4e24\u4e2a\u5355\u72ec\u7684\u51fd\u6570\u4e2d\u8bfb\u53d6\u6240\u6709\u8bf7\u6c42\u3002\u6211\u5e0c\u671b\u80fd\u591f\u83b7\u5f97\u8bfb\u53d6\u6240\u6709\u8bf7\u6c42\u7684\u6240\u6709\u6761\u76ee\uff0c\u4f46\u6211\u53ea\u83b7\u5f97 cassandra \u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u6761\u76ee\u3002<\/p>\n<p><em>\u8fd9\u662f\u6211<strong>\u7f16\u5199<\/strong>\u7684\u65b9\u5f0f\uff1a<\/em><\/p>\n<pre>util.casssession, _ = util.casscluster.createsession()\n    defer util.casssession.close()\n    keyspacemeta, _ := util.casssession.keyspacemetadata(\"platypus\")\n    valc, exists := keyspacemeta.tables[\"cassmessage\"]\n\n    if exists==true {\n        fmt.println(\"cassmessage exists!!!\")\n    }else{\n        fmt.println(\"cassmessage doesnt exist!\")\n    }\n\n    if valc!=nil{\n        fmt.println(\"return from valc cassmessage: \", valc)\n    }\n\n    insertstring:=`insert into cassmessage \n    (messagefrom, messageto, messagecontent) \n    values('`+sendmsgreq.messagefrom+`', '`\n    +sendmsgreq.messageto+`', '`+sendmsgreq.messagecontent+`')`\n\n    fmt.println(\"insertstring value: \", insertstring)\n\n    err := util.casssession.query(insertstring).exec()\n\nif err != nil {\n        fmt.println(\"there was an error in appending data to cassmessage: \", err)\n    } else {\n        fmt.println(\"inserted data into cassmessage successfully\")\n    }<\/pre>\n<p><em>\u4e0a\u9762\u7684\u7ec8\u7aef\u8f93\u51fa\uff1a<\/em><\/p>\n<pre>app_1          | [17:59:43][webserver] : cassmessage exists!!!\napp_1          | [17:59:43][webserver] : return from valc cassmessage:\n&amp;{platypus cassmessage    [] []  \n[0xc000400140] [] map[messagefrom:0xc0004000a0 \nmessageto:0xc000400140 messagecontent:0xc000400000] \n[messagecontent messagefrom messageto]}\napp_1          | [17:59:43][webserver] : inserted data into cassmessage successfully<\/pre>\n<p>\u6211\u4e0d\u5b8c\u5168\u786e\u5b9a <code>valc<\/code> \u7684\u8f93\u51fa\u8fd4\u56de\u4ec0\u4e48\uff0c\u5c3d\u7ba1\u5b83\u4f3c\u4e4e\u662f\u67d0\u79cd\u5185\u5b58\u5730\u5740\uff0c\u8fd9\u662f\u4e00\u4e2a\u597d\u5146\u5934\u3002\u6211\u8fd8\u53d1\u73b0\u6211\u5728 write exec \u51fd\u6570\u4e0a\u6ca1\u6709\u6536\u5230\u4efb\u4f55\u9519\u8bef\uff0c\u8fd9\u662f\u6709\u5e0c\u671b\u7684\u3002<\/p>\n<p><em>\u8fd9\u662f\u6211<strong>\u9605\u8bfb<\/strong>\u7684\u65b9\u5f0f\uff1a<\/em><\/p>\n<pre>util.casssession, _ = util.casscluster.createsession()\ndefer util.casssession.close()\nkeyspacemeta, _ := util.casssession.keyspacemetadata(\"platypus\")\nvalc, exists := keyspacemeta.tables[\"cassmessage\"]\n\nquerystring := `select messageto, messagecontent, messagefrom from cassmessage where messagefrom='`+mailreq.email+`'`\n\/\/returns nothing, should return many rows\nquerystring2 := `select messageto, messagecontent, messagefrom from cassmessage`\n\/\/returns only last entry, should return many rows\nquerystring3 := `select * from cassmessage where messagefrom='`+mailreq.email+`'`\n\/\/returns nothing, should return many rows\nqueryallstring := `select * from cassmessage` \n\/\/returns only last entry, should return many rows\n\nvar messageto string\nvar messagecontent string\nvar messagefrom string\n\niter := util.casssession.query(queryallstring).iter()\nfor iter.scan(&amp;messageto, &amp;messagecontent, &amp;messagefrom) {\n    fmt.println(\"iter messageto: %v\", messageto)\n    fmt.println(\"iter messagecontent: %v\", messagecontent)\n    fmt.println(\"iter messagefrom: %v\", messagefrom)\n}<\/pre>\n<p><em>\u4e0a\u9762\u7684\u7ec8\u7aef\u8f93\u51fa\uff1a<\/em><\/p>\n<pre>app_1          | [18:09:54][WEBSERVER] : Iter messageto: %v [email&nbsp;protected]\napp_1          | [18:09:54][WEBSERVER] : Iter messagecontent: %v a\napp_1          | [18:09:54][WEBSERVER] : Iter messagefrom: %v [email&nbsp;protected]<\/pre>\n<p><strong>\u8fd9\u4e0d\u662f\u6211\u6240\u671f\u671b\u7684<\/strong>\uff0c\u56e0\u4e3a\u8fd9\u662f\u591a\u6b21\u5199\u5165\u6570\u636e\u5e93\u4e4b\u540e<em><\/em>\u8bfb\u53d6\u7684\u8f93\u51fa\u3002\u5982\u679c\u60a8\u67e5\u770b\u5bf9\u5404\u79cd <code>querystring<\/code> \u503c\u7684\u8bc4\u8bba\uff0c\u6211\u5df2\u7ecf\u5c1d\u8bd5\u8fc7\uff0c\u5f53\u6211\u671f\u671b\u8fd4\u56de\u6240\u6709\u6761\u76ee\u65f6\uff0c\u5176\u4e2d 2 \u4e2a\u4e0d\u4f1a\u8fd4\u56de\u4efb\u4f55\u5185\u5bb9\uff0c\u800c\u5176\u4e2d 2 \u4e2a\u4ec5\u8fd4\u56de\u6700\u540e\u4e00\u4e2a\u5199\u5165\u6761\u76ee\uff08\u636e\u6211\u6240\u77e5\uff0c\u5b83\u4eec\u90fd\u662f\u5bf9\u79f0\u67e5\u8be2\uff09\u3002 p&gt; <\/p>\n<p>\u6709\u8c01\u77e5\u9053\u4e3a\u4ec0\u4e48\u6211\u65e0\u6cd5\u4f7f\u7528 iter \u8fd4\u56de\u591a\u4e2a\u6761\u76ee\uff0c\u6216\u8005\u4e3a\u4ec0\u4e48\u6211\u5c1d\u8bd5\u8fc7\u7684\u4e0d\u540c\u67e5\u8be2\u5b57\u7b26\u4e32\u4e0a\u7684\u56db\u4e2a\u4e0d\u540c\u503c\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u679c\uff1f<\/p>\n<p>\u8c22\u8c22\u3002<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u6211\u4e5f\u8bb8\u4e0d\u5e94\u8be5\u8fd9\u6837\u505a\uff0c\u4f46\u6211\u4f1a\u5c06\u5176\u4fdd\u7559\u5728\u8fd9\u91cc\uff0c\u4ee5\u9632\u5176\u4ed6\u4eba\u9047\u5230\u540c\u6837\u7684\u95ee\u9898\u3002\u6211\u4e0d\u786e\u5b9a\u8868\u4e2d\u7684\u4e3b\u952e\u662f\u552f\u4e00\u7684\u3002\u505a\u8fd9\u6837\u7684\u4e8b\u60c5\uff1a<\/p>\n<pre>util.CassSession.Query(\"CREATE TABLE cassmessage(\" +\n    \"messageto text, messagefrom text, messagecontent text, uniqueID text, PRIMARY KEY (uniqueID))\").Exec()<\/pre>\n<p>\u8bbe\u6cd5\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<p>\u611f\u8c22\u6240\u6709\u770b\u8fc7\u5e76\u63d0\u4f9b\u5e2e\u52a9\u7684\u4eba\u3002\u5e72\u676f\uff01<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aGolang\uff08\u5e26 gocql \u9a71\u52a8\u7a0b\u5e8f\uff09\u672a\u8fd4\u56de Cassandra DB \u4e2d\u7684\u6240\u6709\u6761\u76ee\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\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","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-206992","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206992","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=206992"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206992\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}