{"id":29553,"date":"2023-01-01T11:40:14","date_gmt":"2023-12-04T09:50:58","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%98%85%e8%af%bbdapr%e7%8a%b6%e6%80%81%e6%9f%a5%e8%af%a2%e7%9a%84%e5%ae%9e%e7%8e%b0%ef%bc%88visitor%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%ef%bc%89%e3%80%82\/"},"modified":"2025-08-12T14:42:07","modified_gmt":"2025-08-12T06:42:07","slug":"%e9%98%85%e8%af%bbdapr%e7%8a%b6%e6%80%81%e6%9f%a5%e8%af%a2%e7%9a%84%e5%ae%9e%e7%8e%b0%ef%bc%88visitor%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%ef%bc%89%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%98%85%e8%af%bbdapr%e7%8a%b6%e6%80%81%e6%9f%a5%e8%af%a2%e7%9a%84%e5%ae%9e%e7%8e%b0%ef%bc%88visitor%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%ef%bc%89%e3%80%82\/","title":{"rendered":"\u9605\u8bfbDapr\u72b6\u6001\u67e5\u8be2\u7684\u5b9e\u73b0\uff08Visitor\u6a21\u5f0f\u793a\u4f8b\uff09"},"content":{"rendered":"<h1>\u592a\u957f\u4e0d\u770b b\u00fa<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Dapr\u306eState\u306f\u3001\u69d8\u3005\u306aDB\u5b9f\u88c5(MongoDB, MySQL, Redis&#8230;)\u3092\u62bd\u8c61\u5316\u3057\u7d71\u4e00\u7684\u306a\u64cd\u4f5c\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">State Query\u306b\u3088\u3063\u3066\u6761\u4ef6\u306b\u5fdc\u3058\u305f\u30c7\u30fc\u30bf\u306e\u4e00\u89a7\u53d6\u5f97\u304c\u53ef\u80fd<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">State Query\u5185\u90e8\u3067\u306f\u3001Visitor\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u3044Dapr\u306e\u30af\u30a8\u30ea\u3092\u5404\u5b9f\u88c5(DB)\u306e\u30af\u30a8\u30ea\u306b\u5909\u63db<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u2192\u5c06\u6765State\u306b\u65b0\u3057\u3044\u5b9f\u88c5\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3082\u5b9f\u88c5\u4fee\u6b63\u304c\u6700\u5c0f\u9650\u3067\u6e08\u3080\uff01<\/ul>\n<h1>\u9996\u5148\u65b0\u5e74\u5feb\u4e50\u3002<\/p>\n<p>Dapr\u4ee5\u201c\u7ec4\u4ef6\u201d\u7684\u5f62\u5f0f\u5bf9\u6301\u4e45\u5316\u548cPubSub\u7b49\u673a\u5236\u8fdb\u884c\u4e86\u62bd\u8c61\u5316\uff0c\u4f7f\u5f97\u4e2d\u95f4\u4ef6\u53ef\u4ee5\u65e0\u9700\u610f\u8bc6\u5230\u5176\u5177\u4f53\u662f\u4ec0\u4e48\u800c\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e00\u65b9\u3001\u6c38\u7d9a\u5316\u6a5f\u69cb\u300cState\u300d\u3067\u306fDB\u304c\u62bd\u8c61\u5316\u3055\u308c\u308b\u5f15\u304d\u63db\u3048\u306b\u3001\u9577\u3089\u304f\u5358\u7d14\u306a\u53d6\u5f97\u3001\u66f4\u65b0\uff08\u30ec\u30b3\u30fc\u30c9\u306eID\u306e\u6307\u5b9a\u304c\u5fc5\u9808\uff09\u3057\u304b\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001v1.5.0\u304b\u3089State\u3067\u3082\u30af\u30a8\u30ea\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u3064\u3044\u306b\u6761\u4ef6\u5f0f\u3067\u306e\u7d5e\u308a\u8fbc\u307f\u306b\u3088\u308b\u4e00\u89a7\u53d6\u5f97\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\uff01<\/p>\n<p>&nbsp;<\/p>\n<p>\u5229\u7528\u8005\u3068\u3057\u3066\u306fState\u6d3b\u7528\u306e\u5e45\u304c\u5e83\u304c\u3063\u3066\u9858\u3063\u305f\u308a\u304b\u306a\u3063\u305f\u308a\u3067\u3059\u3002\u4e00\u65b9\u3001Dapr\u5074\u306e\u5b9f\u88c5\u3092\u8003\u3048\u308b\u3068\u3001State\u306e\u6761\u4ef6\u5f0f\u3092\u5404DB\u56fa\u6709\u306e\u30af\u30a8\u30ea\u6587\u306b\u5909\u63db\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u5927\u5909\u305d\u3046\u3067\u3059&#8230;<\/p>\n<p>\u6c17\u306b\u306a\u3063\u305f\u306e\u3067\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u307f\u305f\u3068\u3053\u308d\u3001Visitor\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u3063\u3066\u30af\u30a8\u30ea\u5909\u63db\u306e\u8907\u96d1\u3055\u3092\u306a\u308b\u3079\u304f\u8efd\u6e1b\u3055\u305b\u308b\u5de5\u592b\u304c\u306a\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001Visitor\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u4f8b\u3068\u3057\u3066\u3001\u3053\u306eState Query\u306e\u5b9f\u88c5\u3092\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2>\u7248\u672c<\/p>\n<ul class=\"post-ul\">Dapr v1.5.1<\/ul>\n<p>\u7531\u4e8e\u67e5\u8be2\u72b6\u6001\u529f\u80fd\u76ee\u524d\u5904\u4e8e\u03b1\u7248\u672c\u9636\u6bb5\uff0c\u53ef\u80fd\u4f1a\u6709\u8f83\u5927\u7684\u53d8\u52a8\u3002\u8bf7\u60a8\u63d0\u524d\u77e5\u6089\uff0c\u7531\u4e8e\u6b64\u6587\u7ae0\u7684\u5185\u5bb9\u53ef\u80fd\u4f1a\u53d8\u5f97\u8fc7\u65f6\uff0c\u8bf7\u8c05\u89e3\u3002<\/p>\n<h2>State\u5bfe\u5fdc\u72b6\u6cc1&nbsp;<\/p>\n<p>\u76ee\u524d\u4ec5\u67091.5.1\u7248\u672c\u53ef\u4f9b\u4f7f\u7528\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MongoDB<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Azure CosmosDB<\/ul>\n<p>\u53ea\u9700\u8981\u4e00\u79cd\u9009\u62e9\u3002<\/p>\n<h1>\u5173\u4e8eDapr\u72b6\u6001\u67e5\u8be2\u5b9f\u88c5\u306e\u8a71\u306b\u5165\u308b\u524d\u306b\u3001Dapr State Query\u306e\u6a5f\u80fd\u3092\u8efd\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u516c\u5f0f\u30ac\u30a4\u30c9\u306b\u8a66\u3059\u65b9\u6cd5\u304c\u8f09\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u305d\u306e\u3084\u308a\u65b9\u306b\u5f93\u3044\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u51c6\u5907<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\"># \u30d5\u30a1\u30a4\u30eb\u306e\u6e96\u5099\uff08\u2191\u306e\u30b5\u30a4\u30c8\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\uff09<\/span>\r\n<span class=\"nv\">$ <\/span>tree\r\n<span class=\"nb\">.<\/span>\r\n\u2514\u2500\u2500 query-api-examples\r\n    \u251c\u2500\u2500 components\r\n    \u2502\u00a0\u00a0 \u2514\u2500\u2500 mongodb.yml\r\n    \u2514\u2500\u2500 dataset.json\r\n\r\n2 directories, 2 files\r\n\r\n<span class=\"c\"># daprd\u306e\u8d77\u52d5<\/span>\r\n<span class=\"nv\">$ <\/span>dapr init\r\n<span class=\"nv\">$ <\/span>dapr <span class=\"nt\">-v<\/span>\r\nCLI version: 1.5.1 \r\nRuntime version: 1.5.1\r\n\r\n<span class=\"c\"># MongoDB\u3068\u30c7\u30e2\u30a2\u30d7\u30ea\u3092\u8d77\u52d5<\/span>\r\n<span class=\"nv\">$ <\/span>docker run <span class=\"nt\">-d<\/span> <span class=\"nt\">--rm<\/span> <span class=\"nt\">-p<\/span> 27017:27017 <span class=\"nt\">--name<\/span> mongodb mongo:5\r\n<span class=\"nv\">$ <\/span>dapr run <span class=\"nt\">--app-id<\/span> demo <span class=\"nt\">--dapr-http-port<\/span> 3500 <span class=\"nt\">--components-path<\/span> query-api-examples\/components\r\n\r\n<span class=\"c\"># \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf\u3092state\u306b\u4fdd\u5b58<\/span>\r\n<span class=\"nv\">$ <\/span>curl <span class=\"nt\">-X<\/span> POST <span class=\"nt\">-H<\/span> <span class=\"s2\">\"Content-Type: application\/json\"<\/span> <span class=\"nt\">-d<\/span> @query-api-examples\/dataset.json http:\/\/localhost:3500\/v1.0\/state\/statestore\r\n<\/code><\/pre>\n<h2>\u56fd\u5bb6\u67e5\u8be2\u8bf7\u6c42<br \/>\n\u5f53\u5728\u8fc7\u6ee4\u5668\u4e2d\u5199\u5165\u6761\u4ef6\u65f6\uff0c\u53ef\u4ee5\u6279\u91cf\u68c0\u7d22\u4e0e\u6761\u4ef6\u5339\u914d\u7684\u6570\u636e\u3002\u8981\u6307\u5b9a\u76ee\u6807\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528\u7c7b\u4f3c\u4e8ejsonpath\u7684\u8def\u5f84\u683c\u5f0f\u3002<\/p>\n<p>\uff082022\/4\/16\u66f4\u65b0\uff1a\u4ee5\u524d\u5199\u4f5c\u65f6\u63d0\u5230\u4e86\u300c\u7c7b\u4f3cjq\u7684\u8def\u5f84\u683c\u5f0f\u300d\uff0c\u4f46\u5728\u53c2\u8003\u8d44\u6599\u4e2d\u53d1\u73b0\u4e86\u300c\u7c7b\u4f3cjsonpath\u7684\u683c\u5f0f\u300d\u7684\u8bf4\u660e\uff0c\u56e0\u6b64\u8fdb\u884c\u4e86\u4fee\u6b63\u3002\uff09<\/p>\n<pre class=\"post-pre\"><code>\/\/ data\u4e2d <span class=\"s2\">\".state\"<\/span> \u306e\u5024\u304c <span class=\"s2\">\"CA\"<\/span> \u306b\u7b49\u3057\u3044\u3082\u306e\u3092\u53d6\u5f97\r\n<span class=\"nv\">$ <\/span>curl <span class=\"nt\">-s<\/span> <span class=\"nt\">-X<\/span> POST <span class=\"nt\">-H<\/span> <span class=\"s2\">\"Content-Type: application\/json\"<\/span> <span class=\"nt\">-d<\/span> <span class=\"s1\">'{\"query\": {\"filter\": {\"EQ\": {\"value.state\": \"CA\"}}}}'<\/span> http:\/\/localhost:3500\/v1.0-alpha1\/state\/statestore\/query | jq <span class=\"nb\">.<\/span>\r\n<span class=\"o\">{<\/span>\r\n  <span class=\"s2\">\"results\"<\/span>: <span class=\"o\">[<\/span>\r\n    <span class=\"o\">{<\/span>\r\n      <span class=\"s2\">\"key\"<\/span>: <span class=\"s2\">\"3\"<\/span>,\r\n      <span class=\"s2\">\"data\"<\/span>: <span class=\"o\">{<\/span>\r\n        <span class=\"s2\">\"city\"<\/span>: <span class=\"s2\">\"Sacramento\"<\/span>,\r\n        <span class=\"s2\">\"state\"<\/span>: <span class=\"s2\">\"CA\"<\/span>,\r\n        <span class=\"s2\">\"person\"<\/span>: <span class=\"o\">{<\/span>\r\n          <span class=\"s2\">\"id\"<\/span>: <span class=\"o\">{<\/span>\r\n            <span class=\"s2\">\"<\/span><span class=\"nv\">$numberDouble<\/span><span class=\"s2\">\"<\/span>: <span class=\"s2\">\"1071.0\"<\/span>\r\n          <span class=\"o\">}<\/span>,\r\n          <span class=\"s2\">\"org\"<\/span>: <span class=\"s2\">\"Finance\"<\/span>\r\n        <span class=\"o\">}<\/span>\r\n      <span class=\"o\">}<\/span>,\r\n      <span class=\"s2\">\"etag\"<\/span>: <span class=\"s2\">\"26838a01-da42-4663-85cb-2e0c09ba6a30\"<\/span>\r\n    <span class=\"o\">}<\/span>,\r\n    <span class=\"o\">{<\/span>\r\n      <span class=\"s2\">\"key\"<\/span>: <span class=\"s2\">\"5\"<\/span>,\r\n      <span class=\"s2\">\"data\"<\/span>: <span class=\"o\">{<\/span>\r\n        <span class=\"s2\">\"person\"<\/span>: <span class=\"o\">{<\/span>\r\n          <span class=\"s2\">\"org\"<\/span>: <span class=\"s2\">\"Hardware\"<\/span>,\r\n          <span class=\"s2\">\"id\"<\/span>: <span class=\"o\">{<\/span>\r\n            <span class=\"s2\">\"<\/span><span class=\"nv\">$numberDouble<\/span><span class=\"s2\">\"<\/span>: <span class=\"s2\">\"1007.0\"<\/span>\r\n          <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>,\r\n        <span class=\"s2\">\"city\"<\/span>: <span class=\"s2\">\"Los Angeles\"<\/span>,\r\n        <span class=\"s2\">\"state\"<\/span>: <span class=\"s2\">\"CA\"<\/span>\r\n      <span class=\"o\">}<\/span>,\r\n      <span class=\"s2\">\"etag\"<\/span>: <span class=\"s2\">\"b5ae26a9-fa38-4298-9e8c-7be68168ae8e\"<\/span>\r\n    <span class=\"o\">}<\/span>,\r\n    <span class=\"o\">{<\/span>\r\n      <span class=\"s2\">\"key\"<\/span>: <span class=\"s2\">\"7\"<\/span>,\r\n      <span class=\"s2\">\"data\"<\/span>: <span class=\"o\">{<\/span>\r\n        <span class=\"s2\">\"person\"<\/span>: <span class=\"o\">{<\/span>\r\n          <span class=\"s2\">\"org\"<\/span>: <span class=\"s2\">\"Dev Ops\"<\/span>,\r\n          <span class=\"s2\">\"id\"<\/span>: <span class=\"o\">{<\/span>\r\n            <span class=\"s2\">\"<\/span><span class=\"nv\">$numberDouble<\/span><span class=\"s2\">\"<\/span>: <span class=\"s2\">\"1015.0\"<\/span>\r\n          <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>,\r\n        <span class=\"s2\">\"city\"<\/span>: <span class=\"s2\">\"San Francisco\"<\/span>,\r\n        <span class=\"s2\">\"state\"<\/span>: <span class=\"s2\">\"CA\"<\/span>\r\n      <span class=\"o\">}<\/span>,\r\n      <span class=\"s2\">\"etag\"<\/span>: <span class=\"s2\">\"8489b9e7-ba4a-411e-9ede-f9db09cf848a\"<\/span>\r\n    <span class=\"o\">}<\/span>,\r\n    <span class=\"o\">{<\/span>\r\n      <span class=\"s2\">\"key\"<\/span>: <span class=\"s2\">\"9\"<\/span>,\r\n      <span class=\"s2\">\"data\"<\/span>: <span class=\"o\">{<\/span>\r\n        <span class=\"s2\">\"person\"<\/span>: <span class=\"o\">{<\/span>\r\n          <span class=\"s2\">\"id\"<\/span>: <span class=\"o\">{<\/span>\r\n            <span class=\"s2\">\"<\/span><span class=\"nv\">$numberDouble<\/span><span class=\"s2\">\"<\/span>: <span class=\"s2\">\"1002.0\"<\/span>\r\n          <span class=\"o\">}<\/span>,\r\n          <span class=\"s2\">\"org\"<\/span>: <span class=\"s2\">\"Finance\"<\/span>\r\n        <span class=\"o\">}<\/span>,\r\n        <span class=\"s2\">\"city\"<\/span>: <span class=\"s2\">\"San Diego\"<\/span>,\r\n        <span class=\"s2\">\"state\"<\/span>: <span class=\"s2\">\"CA\"<\/span>\r\n      <span class=\"o\">}<\/span>,\r\n      <span class=\"s2\">\"etag\"<\/span>: <span class=\"s2\">\"157cdf03-cf20-42f4-9d52-22672cce26de\"<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">]<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u53ef\u7528\u4e8e\u8fc7\u6ee4\u5668\u7684\u56db\u79cd\u7c7b\u578b\u3002<\/p>\n<div>\n<div class=\"post-table\">\u30d5\u30a3\u30eb\u30bf\u52b9\u679c\u4f8b<code>EQ<\/code>\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u306e\u5024\u304c\u6307\u5b9a\u3057\u305f\u5024\u3068\u7b49\u3057\u3044<code>{\"EQ\": {\"value.foo\": \"bar\"}}<\/code><code>IN<\/code>\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u306e\u5024\u304c\u6307\u5b9a\u3057\u305f\u914d\u5217\u306b\u542b\u307e\u308c\u308b<code>{\"IN\": {\"value.foo\": [\"bar\", \"baz\"]}}<\/code><code>AND<\/code>\u30d5\u30a3\u30eb\u30bf\u3092\u5168\u3066\u6e80\u305f\u3059<code>{\"AND\": [{\"EQ\": ...}, {\"IN\": ...}]}<\/code><code>OR<\/code>\u30d5\u30a3\u30eb\u30bf\u30921\u3064\u3067\u3082\u6e80\u305f\u3059<code>{\"OR\": [{\"EQ\": ...}, {\"IN\": ...}]}<\/code><br \/>\n&nbsp;<\/p>\n<p>\u5982\u679c\u672a\u6307\u5b9a\u67e5\u8be2\u8fc7\u6ee4\u5668\uff0c\u5c06\u83b7\u53d6State\u7684\u6240\u6709\u8bb0\u5f55\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$ <\/span>curl <span class=\"nt\">-s<\/span> <span class=\"nt\">-X<\/span> POST <span class=\"nt\">-H<\/span> <span class=\"s2\">\"Content-Type: application\/json\"<\/span> <span class=\"nt\">-d<\/span> <span class=\"s1\">'{\"query\": {}}'<\/span> http:\/\/localhost:3500\/v1.0-alpha1\/state\/statestore\/query  | jq <span class=\"nb\">.<\/span>\r\n<span class=\"o\">{<\/span>\r\n  <span class=\"s2\">\"results\"<\/span>: <span class=\"o\">[<\/span>\r\n    <span class=\"o\">{<\/span>\r\n      <span class=\"s2\">\"key\"<\/span>: <span class=\"s2\">\"1\"<\/span>,\r\n      <span class=\"s2\">\"data\"<\/span>: <span class=\"o\">{<\/span>\r\n        <span class=\"s2\">\"person\"<\/span>: <span class=\"o\">{<\/span>\r\n          <span class=\"s2\">\"org\"<\/span>: <span class=\"s2\">\"Dev Ops\"<\/span>,\r\n          <span class=\"s2\">\"id\"<\/span>: <span class=\"o\">{<\/span>\r\n            <span class=\"s2\">\"<\/span><span class=\"nv\">$numberDouble<\/span><span class=\"s2\">\"<\/span>: <span class=\"s2\">\"1036.0\"<\/span>\r\n          <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>,\r\n        <span class=\"s2\">\"city\"<\/span>: <span class=\"s2\">\"Seattle\"<\/span>,\r\n        <span class=\"s2\">\"state\"<\/span>: <span class=\"s2\">\"WA\"<\/span>\r\n      <span class=\"o\">}<\/span>,\r\n      <span class=\"s2\">\"etag\"<\/span>: <span class=\"s2\">\"00858945-c8bb-48d0-811f-66c0fa1f0780\"<\/span>\r\n    <span class=\"o\">}<\/span>,\r\n    ...\r\n  <span class=\"o\">]<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u4f60\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff1f&#8221;Dapr State \u7684\u67e5\u8be2\u4e0d\u8bba\u5b9e\u73b0\u5982\u4f55\uff0c\u5c3d\u7ba1\u5f62\u5f0f\u76f8\u540c\uff0c\u4f46\u5185\u90e8\u80af\u5b9a\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u5404\u4e2a\u6570\u636e\u5e93\u5b9e\u73b0\u7684\u67e5\u8be2\u3002\u5b83\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u5462\uff1f&#8221;<\/p>\n<h2>\u4f7f\u7528\u8bbf\u95ee\u8005\u6a21\u5f0f\u8fdb\u884c\u8bbe\u8ba1\u901a\u8fc7\u4f7f\u7528\u8bbf\u95ee\u8005\u6a21\u5f0f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u8bbe\u8ba1\uff0c\u4ec5\u9700\u66ff\u6362&#8221;\u5c06\u72b6\u6001\u67e5\u8be2\u8f6c\u6362\u4e3a\u7ec4\u4ef6\u5b9e\u73b0\uff08\u5982MongoDB\u7b49\uff09\u7684\u67e5\u8be2&#8221;\u8fd9\u90e8\u5206\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u7531\u4e8e\u8f93\u5165\u548c\u751f\u6210\u7269\u90fd\u5177\u6709\u201c\u67e5\u8be2\u201d\u8fd9\u4e2a\u672f\u8bed\uff0c\u6240\u4ee5\u4ee5\u4e0b\u5c06\u660e\u786e\u533a\u5206Dapr\u72b6\u6001\u67e5\u8be2\u548c\u7ec4\u4ef6\u5b9e\u73b0\u67e5\u8be2\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d025a37434c4406bd0abd\/40-0.png\" alt=\"dapr_state.drawio.png\" \/>\u8bbe\u8ba1\u7684\u4e3b\u8981\u89d2\u8272\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<p>\u8bbe\u8ba1\u7684\u4e3b\u8981\u4eba\u7269\u5305\u62ec\u4ee5\u4e0b\u4eba\u5458\u3002<\/p>\n<p>Querier: Dapr state query API\u306e\u30cf\u30f3\u30c9\u30e9\uff08\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3057\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3059\uff09<\/p>\n<p>Builder: Dapr state\u30af\u30a8\u30ea\u304b\u3089Component\u5b9f\u88c5\u306e\u30af\u30a8\u30ea\u3092\u751f\u6210<\/p>\n<p>Visitor: Dapr state\u30af\u30a8\u30ea\u306e\u8981\u7d20\u306b\u5fdc\u3058\u305f\u3001Component\u5b9f\u88c5\u306e\u30af\u30a8\u30ea\u7247\u3092\u751f\u6210<\/p>\n<p>Query: \u30ea\u30af\u30a8\u30b9\u30c8\u3055\u308c\u305fDapr state\u30af\u30a8\u30ea<\/p>\n<p>\u7531\u4e8eDapr\u72b6\u6001\u67e5\u8be2\u7684\u6570\u636e\u7ed3\u6784\u67e5\u8be2\u548c\u5b9e\u73b0\u76f8\u5173\u7684\u67e5\u8be2\u8f6c\u6362\u5904\u7406\u7a0b\u5e8f\u88ab\u5206\u79bb\uff0c\u56e0\u6b64\u53ea\u9700\u589e\u52a0Visitor\u7684\u5b9e\u73b0\u5373\u53ef\uff0c\u800c\u4e0d\u9700\u8981\u5bf9\u5176\u4ed6\u90e8\u5206\u8fdb\u884c\u66f4\u6539\uff0c\u5373\u4f7f\u6dfb\u52a0\u4e86\u7ec4\u4ef6\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5b9e\u9645\u5904\u7406\u7684\u6d41\u7a0b\u3002<\/p>\n<h2>Dapr state query API\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u53d7\u3051\u53d6\u308b<br \/>\nQuerier\u306e\u5b9f\u88c5*mongodb.MongoDB\u306f\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u4e2d\u306eDapr state\u30af\u30a8\u30ea\u3092Builder\u306b\u6e21\u3057\u3001MongoDB\u306e\u30af\u30a8\u30ea\u306b\u5909\u63db\u3057\u307e\u3059\u3002<br \/>\n\u305d\u306e\u5f8c\u3001\u5909\u63db\u3055\u308c\u305f\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u3066MongoDB\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span> <span class=\"o\">*<\/span><span class=\"n\">MongoDB<\/span><span class=\"p\">)<\/span> <span class=\"n\">Query<\/span><span class=\"p\">(<\/span><span class=\"n\">req<\/span> <span class=\"o\">*<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryRequest<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"n\">q<\/span> <span class=\"o\">:=<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">Query<\/span><span class=\"p\">{}<\/span> <span class=\"c\">\/\/ MongoDB\u306e\u30af\u30a8\u30ea<\/span>\r\n\t<span class=\"n\">qbuilder<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">query<\/span><span class=\"o\">.<\/span><span class=\"n\">NewQueryBuilder<\/span><span class=\"p\">(<\/span><span class=\"n\">q<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"c\">\/\/ dapr state\u306e\u30af\u30a8\u30ea req.Query \u304b\u3089MongoDB\u306e\u30af\u30a8\u30ea\u3092\u751f\u6210\u3057\u3001 q \u306b\u66f8\u304d\u8fbc\u307f<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">qbuilder<\/span><span class=\"o\">.<\/span><span class=\"n\">BuildQuery<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">req<\/span><span class=\"o\">.<\/span><span class=\"n\">Query<\/span><span class=\"p\">);<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{},<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"c\">\/\/ MongoDB\u306b\u30ea\u30af\u30a8\u30b9\u30c8<\/span>\r\n\t<span class=\"n\">data<\/span><span class=\"p\">,<\/span> <span class=\"n\">token<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">execute<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"n\">collection<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{},<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\r\n\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{<\/span>\r\n\t\t<span class=\"n\">Results<\/span><span class=\"o\">:<\/span> <span class=\"n\">data<\/span><span class=\"p\">,<\/span>\r\n\t\t<span class=\"n\">Token<\/span><span class=\"o\">:<\/span>   <span class=\"n\">token<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"p\">},<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>Builder\u304cDapr state\u30af\u30a8\u30ea\u3092MongoDB\u306e\u30af\u30a8\u30ea\u306b\u5909\u63db<br \/>\n\u5efa\u9020\u8005\u5c06\u6309\u7167\u4ee5\u4e0b\u7684\u4e24\u4e2a\u6b65\u9aa4\u6765\u8f6c\u6362\u67e5\u8be2\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Dapr state\u306e\u30d5\u30a3\u30eb\u30bf\u3092Component\u5b9f\u88c5\u306e\u30af\u30a8\u30ea\u6587\u5b57\u5217\u306b\u5909\u63db<\/ul>\n<\/li>\n<\/ul>\n<p>MongoDB\u306e\u5834\u5408\u3001\u30af\u30a8\u30ea\u6587\u5b57\u5217\u306f &#8220;{\\&#8221;foo\\&#8221;: \\&#8221;bar\\&#8221;}&#8221; \u306e\u3088\u3046\u306a\u5f62\u5f0f<\/p>\n<p>\u4e0a\u8a18\u306e\u30af\u30a8\u30ea\u6587\u5b57\u5217\u304b\u3089Component\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3059\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u5909\u63db<\/p>\n<p>MongoDB\u306e\u5834\u5408\u3001BSON\u5f62\u5f0f\u306b\u5909\u63db\u3055\u308c Visitor \u5185\u90e8\u3067\u4fdd\u6301\u3055\u308c\u308b<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">h<\/span> <span class=\"o\">*<\/span><span class=\"n\">Builder<\/span><span class=\"p\">)<\/span> <span class=\"n\">BuildQuery<\/span><span class=\"p\">(<\/span><span class=\"n\">q<\/span> <span class=\"o\">*<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"kt\">error<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"c\">\/\/ Dapr state\u306e\u30d5\u30a3\u30eb\u30bf\u304b\u3089component\u5b9f\u88c5\u306e\u30d5\u30a3\u30eb\u30bf\uff08\u3092\u8868\u3059\u30af\u30a8\u30ea\u6587\u5b57\u5217\uff09\u3092\u751f\u6210<\/span>\r\n\t<span class=\"n\">filters<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">buildFilter<\/span><span class=\"p\">(<\/span><span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">Filter<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\r\n\t<span class=\"c\">\/\/ \u4e0a\u8a18\u3067\u751f\u6210\u3057\u305f\u30d5\u30a3\u30eb\u30bf\u6587\u5b57\u5217\u3092\u3082\u3068\u306b\u3001component\u5b9f\u88c5\u306e\u30af\u30a8\u30ea\u3092\u751f\u6210<\/span>\r\n\t<span class=\"k\">return<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">visitor<\/span><span class=\"o\">.<\/span><span class=\"n\">Finalize<\/span><span class=\"p\">(<\/span><span class=\"n\">filters<\/span><span class=\"p\">,<\/span> <span class=\"n\">q<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u751f\u6210\u30af\u30a8\u30ea\u6587\u5b57\u5217\u306e\u51e6\u7406\u306f\u3001Component\u306e\u5b9f\u88c5\u3067\u306f\u306a\u304f\u3001Visitor\u306b\u59d4\u8a17\u3057\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Builder: Dapr State\u30af\u30a8\u30ea\u306e\u5185\u90e8\u69cb\u9020\u3092\u63d0\u4f9b\uff08\u5168Component\u5b9f\u88c5\u3067\u5171\u901a\u306e\u90e8\u5206\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Visitor: Dapr State\u30af\u30a8\u30ea\u306e\u5404\u8981\u7d20\u3092Component\u5b9f\u88c5\u306e\u30af\u30a8\u30ea\u306e\u5f62\u5f0f\u306b\u5909\u63db\uff08Component\u5b9f\u88c5\u3054\u3068\u306b\u7570\u306a\u308b\uff09<\/ul>\n<p>\u80fd\u591f\u4fdd\u6301\u677e\u6563\u8026\u5408\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">h<\/span> <span class=\"o\">*<\/span><span class=\"n\">Builder<\/span><span class=\"p\">)<\/span> <span class=\"n\">buildFilter<\/span><span class=\"p\">(<\/span><span class=\"n\">filter<\/span> <span class=\"n\">Filter<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">filter<\/span> <span class=\"o\">==<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"s\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n  <span class=\"c\">\/\/ Builder\u306f\u300c\u3053\u306e\u30d5\u30a3\u30eb\u30bf\u304c\u6765\u305f\u3089\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u300d\u3068\u3044\u3046\u3068\u3053\u308d\u307e\u3067\u3057\u304b\u7ba1\u7406\u3057\u306a\u3044\u3002\u5b9f\u969b\u306e\u6587\u5b57\u5217\u751f\u6210\u51e6\u7406\u306fVisitor\u306e\u5b9f\u88c5\u304c\u62c5\u3046\u3002<\/span>\r\n\t<span class=\"k\">switch<\/span> <span class=\"n\">f<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">filter<\/span><span class=\"o\">.<\/span><span class=\"p\">(<\/span><span class=\"k\">type<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">case<\/span> <span class=\"o\">*<\/span><span class=\"n\">EQ<\/span><span class=\"o\">:<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">visitor<\/span><span class=\"o\">.<\/span><span class=\"n\">VisitEQ<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">case<\/span> <span class=\"o\">*<\/span><span class=\"n\">IN<\/span><span class=\"o\">:<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">visitor<\/span><span class=\"o\">.<\/span><span class=\"n\">VisitIN<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">case<\/span> <span class=\"o\">*<\/span><span class=\"n\">OR<\/span><span class=\"o\">:<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">visitor<\/span><span class=\"o\">.<\/span><span class=\"n\">VisitOR<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">case<\/span> <span class=\"o\">*<\/span><span class=\"n\">AND<\/span><span class=\"o\">:<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">h<\/span><span class=\"o\">.<\/span><span class=\"n\">visitor<\/span><span class=\"o\">.<\/span><span class=\"n\">VisitAND<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">default<\/span><span class=\"o\">:<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"s\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Errorf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"unsupported filter type %#v\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">filter<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728Dapr\u72b6\u6001\u67e5\u8be2\u7684\u8fc7\u6ee4\u5668\u4e2d\uff0cVisitor\u7684\u5b9e\u73b0*mongodb.Query\u4f1a\u751f\u6210\u76f8\u5e94\u7684MongoDB\u67e5\u8be2\u7247\u6bb5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">q<\/span> <span class=\"o\">*<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"n\">VisitEQ<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span> <span class=\"o\">*<\/span><span class=\"n\">query<\/span><span class=\"o\">.<\/span><span class=\"n\">EQ<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"c\">\/\/ { &lt;key&gt;: &lt;val&gt; }<\/span>\r\n\t<span class=\"k\">return<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Sprintf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{ %q: %q }\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Key<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Val<\/span><span class=\"p\">),<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">q<\/span> <span class=\"o\">*<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"n\">VisitIN<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span> <span class=\"o\">*<\/span><span class=\"n\">query<\/span><span class=\"o\">.<\/span><span class=\"n\">IN<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"c\">\/\/ { $in: [ &lt;val1&gt;, &lt;val2&gt;, ... , &lt;valN&gt; ] }<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Vals<\/span><span class=\"p\">)<\/span> <span class=\"o\">==<\/span> <span class=\"m\">0<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"s\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Errorf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"empty IN operator for key %q\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Key<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"n\">str<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Sprintf<\/span><span class=\"p\">(<\/span><span class=\"s\">`{ %q: { \"$in\": [ %q`<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Key<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Vals<\/span><span class=\"p\">[<\/span><span class=\"m\">0<\/span><span class=\"p\">])<\/span>\r\n\t<span class=\"k\">for<\/span> <span class=\"n\">_<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"n\">Vals<\/span><span class=\"p\">[<\/span><span class=\"m\">1<\/span><span class=\"o\">:<\/span><span class=\"p\">]<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"n\">str<\/span> <span class=\"o\">+=<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Sprintf<\/span><span class=\"p\">(<\/span><span class=\"s\">\", %q\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"n\">str<\/span> <span class=\"o\">+=<\/span> <span class=\"s\">\" ] } }\"<\/span>\r\n\r\n\t<span class=\"k\">return<\/span> <span class=\"n\">str<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ VisitAnd, VisitOr\u3082\u540c\u69d8 (\u518d\u5e30\u51e6\u7406\u304c\u5165\u308a\u9577\u3044\u306e\u3067\u7565)<\/span>\r\n<\/code><\/pre>\n<p>\u6e38\u5ba2\u751f\u6210\u7684\u8fc7\u6ee4\u5668\u5b57\u7b26\u4e32\u5c06\u5728Finalize\u65f6\u8f6c\u53d8\u4e3a\u5b8c\u6574\u7684BSON\u67e5\u8be2\u3002<br \/>\n\u8f6c\u6362\u5b8c\u6210\u7684\u67e5\u8be2\u5c06\u4fdd\u5b58\u5728q.filter\u4e2d\uff0c\u5728Visitor\u4e2d\u8fdb\u884c\u7ba1\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">q<\/span> <span class=\"o\">*<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"n\">Finalize<\/span><span class=\"p\">(<\/span><span class=\"n\">filters<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">qq<\/span> <span class=\"o\">*<\/span><span class=\"n\">query<\/span><span class=\"o\">.<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"kt\">error<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">query<\/span> <span class=\"o\">=<\/span> <span class=\"n\">filters<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">filters<\/span><span class=\"p\">)<\/span> <span class=\"o\">==<\/span> <span class=\"m\">0<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">filter<\/span> <span class=\"o\">=<\/span> <span class=\"n\">bson<\/span><span class=\"o\">.<\/span><span class=\"n\">D<\/span><span class=\"p\">{}<\/span>\r\n\t<span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">bson<\/span><span class=\"o\">.<\/span><span class=\"n\">UnmarshalExtJSON<\/span><span class=\"p\">([]<\/span><span class=\"kt\">byte<\/span><span class=\"p\">(<\/span><span class=\"n\">filters<\/span><span class=\"p\">),<\/span> <span class=\"no\">false<\/span><span class=\"p\">,<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">filter<\/span><span class=\"p\">);<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">opts<\/span> <span class=\"o\">=<\/span> <span class=\"n\">options<\/span><span class=\"o\">.<\/span><span class=\"n\">Find<\/span><span class=\"p\">()<\/span>\r\n\r\n\t<span class=\"c\">\/\/ Dapr state query\u306e\u30bd\u30fc\u30c8\u3068\u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u3082BSON\u306b\u5909\u63db\u3057\u8ffd\u52a0<\/span>\r\n\t<span class=\"c\">\/\/ ...<\/span>\r\n\r\n\t<span class=\"k\">return<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5411MongoDB\u53d1\u9001MongoDB\u67e5\u8be2\u8bf7\u6c42<br \/>\n\u6700\u540e\uff0cDapr\u72b6\u6001\u67e5\u8be2API\u5904\u7406\u7a0b\u5e8f\u5c06\u59d4\u6258\u7ed9Visitor\u5411\u7ec4\u4ef6\u5b9e\u73b0\u53d1\u51fa\u8bf7\u6c42\u3002<\/p>\n<p>\u518d\u6b21\u63d0\u5230<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">m<\/span> <span class=\"o\">*<\/span><span class=\"n\">MongoDB<\/span><span class=\"p\">)<\/span> <span class=\"n\">Query<\/span><span class=\"p\">(<\/span><span class=\"n\">req<\/span> <span class=\"o\">*<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryRequest<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"n\">q<\/span> <span class=\"o\">:=<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">Query<\/span><span class=\"p\">{}<\/span>\r\n\t<span class=\"n\">qbuilder<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">query<\/span><span class=\"o\">.<\/span><span class=\"n\">NewQueryBuilder<\/span><span class=\"p\">(<\/span><span class=\"n\">q<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">qbuilder<\/span><span class=\"o\">.<\/span><span class=\"n\">BuildQuery<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">req<\/span><span class=\"o\">.<\/span><span class=\"n\">Query<\/span><span class=\"p\">);<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{},<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"c\">\/\/ \u2605 MongoDB\u306b\u30ea\u30af\u30a8\u30b9\u30c8<\/span>\r\n\t<span class=\"n\">data<\/span><span class=\"p\">,<\/span> <span class=\"n\">token<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">execute<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"n\">collection<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{},<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\r\n\t<span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryResponse<\/span><span class=\"p\">{<\/span>\r\n\t\t<span class=\"n\">Results<\/span><span class=\"o\">:<\/span> <span class=\"n\">data<\/span><span class=\"p\">,<\/span>\r\n\t\t<span class=\"n\">Token<\/span><span class=\"o\">:<\/span>   <span class=\"n\">token<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"p\">},<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8bbf\u95ee\u8005\u5c06\u4f7f\u7528\u5148\u524d\u521b\u5efa\u7684BSON\u67e5\u8be2\uff08q.filter\uff09\u5411MongoDB\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">q<\/span> <span class=\"o\">*<\/span><span class=\"n\">Query<\/span><span class=\"p\">)<\/span> <span class=\"n\">execute<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span> <span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">Context<\/span><span class=\"p\">,<\/span> <span class=\"n\">collection<\/span> <span class=\"o\">*<\/span><span class=\"n\">mongo<\/span><span class=\"o\">.<\/span><span class=\"n\">Collection<\/span><span class=\"p\">)<\/span> <span class=\"p\">([]<\/span><span class=\"n\">state<\/span><span class=\"o\">.<\/span><span class=\"n\">QueryItem<\/span><span class=\"p\">,<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"n\">cur<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">collection<\/span><span class=\"o\">.<\/span><span class=\"n\">Find<\/span><span class=\"p\">(<\/span><span class=\"n\">ctx<\/span><span class=\"p\">,<\/span> <span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">filter<\/span><span class=\"p\">,<\/span> <span class=\"p\">[]<\/span><span class=\"o\">*<\/span><span class=\"n\">options<\/span><span class=\"o\">.<\/span><span class=\"n\">FindOptions<\/span><span class=\"p\">{<\/span><span class=\"n\">q<\/span><span class=\"o\">.<\/span><span class=\"n\">opts<\/span><span class=\"p\">}<\/span><span class=\"o\">...<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"no\">nil<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"c\">\/\/ \u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u8a70\u3081\u66ff\u3048\u51e6\u7406<\/span>\r\n\t<span class=\"c\">\/\/ ...<\/span>\r\n\r\n\t<span class=\"k\">return<\/span> <span class=\"n\">ret<\/span><span class=\"p\">,<\/span> <span class=\"n\">token<\/span><span class=\"p\">,<\/span> <span class=\"no\">nil<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u8ba4\u4e3aexecute\u975e\u516c\u5f00\u662f\u56e0\u4e3a\u53c2\u6570\u662f\u5b9e\u73b0\u76f8\u5173\u6027\u7684\u7f18\u65451\u3002<\/p>\n<p>\u6700\u540e\uff0c\u8fd9\u4e2a\u8fd4\u56de\u503c\u5c06\u4f5c\u4e3aDapr\u72b6\u6001\u67e5\u8be2API\u7684\u54cd\u5e94\u8fd4\u56de\u3002\u8f9b\u82e6\u4e86\u3002<\/p>\n<h1>\u6700\u540e<br \/>\n\u4ee5\u524d\u4ece\u672a\u4f7f\u7528\u8fc7\u8bbf\u95ee\u8005\u6a21\u5f0f\uff0c\u6211\u4e00\u76f4\u5728\u601d\u8003\u5b83\u662f\u5426\u771f\u7684\u6709\u7528\u3002\u4f46\u662f\u5f53\u6211\u770b\u5230\u5b9e\u9645\u7684\u4f8b\u5b50\u540e\uff0c\u6211\u604d\u7136\u5927\u609f\u3002<br \/>\n\u5f53\u6211\u518d\u6b21\u56de\u987e\u300aJava\u8bed\u8a00\u5b66\u4e60 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