{"id":184954,"date":"2023-08-24T18:49:18","date_gmt":"2023-08-24T10:49:18","guid":{"rendered":"http:\/\/www.idc.net\/help\/184954\/"},"modified":"2023-08-24T18:49:18","modified_gmt":"2023-08-24T10:49:18","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91%e5%b0%8f%e7%a8%8b%e5%ba%8f%e6%95%99%e7%a8%8b%ef%bc%9asdk%e6%95%b0%e6%8d%ae%e5%ba%93-database%c2%b7%e5%8f%91%e8%b5%b7%e4%ba%8b%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/184954\/","title":{"rendered":"\u540e\u6d6a\u4e91\u5c0f\u7a0b\u5e8f\u6559\u7a0b\uff1aSDK\u6570\u636e\u5e93 database\u00b7\u53d1\u8d77\u4e8b\u52a1"},"content":{"rendered":"

Database.runTransaction(callback: function, times: number): Promise<any><\/h2>\n

\n \u652f\u6301\u7aef\uff1a\u4e91\u51fd\u6570\n<\/p><\/blockquote>\n

\u53d1\u8d77\u4e8b\u52a1\u3002\u4ec5\u53ef\u5728\u4e91\u51fd\u6570\u4e2d\u4f7f\u7528\u3002<\/p>\n

\u53c2\u6570<\/h2>\n

callback: function<\/h3>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\uff0c\u9700\u4e3a async \u5f02\u6b65\u51fd\u6570\u6216\u8fd4\u56de Promise \u7684\u51fd\u6570<\/p>\n

times: number<\/h3>\n

\u4e8b\u52a1\u6267\u884c\u6700\u591a\u6b21\u6570\uff0c\u9ed8\u8ba4 3 \u6b21\uff0c\u6210\u529f\u540e\u4e0d\u91cd\u590d\u6267\u884c\uff0c\u53ea\u6709\u4e8b\u52a1\u51b2\u7a81\u65f6\u4f1a\u91cd\u8bd5\uff0c\u5176\u4ed6\u5f02\u5e38\u65f6\u4e0d\u4f1a\u91cd\u8bd5<\/p>\n

\u8fd4\u56de\u503c<\/h2>\n

Promise.<any><\/h3>\n

resolve \u7684\u7ed3\u679c\u4e3a callback \u4e8b\u52a1\u6267\u884c\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0creject \u7684\u7ed3\u679c\u4e3a\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\u6216\u8005\u662f transaction.rollback \u4f20\u5165\u7684\u503c<\/p>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u8bf4\u660e<\/h2>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u7531\u5f00\u53d1\u8005\u4f20\u5165\uff0c\u51fd\u6570\u63a5\u6536\u4e00\u4e2a\u53c2\u6570 transaction\uff08\u7c7b\u578b\u5b9a\u4e49\u89c1 Transaction\uff09\uff0c\u5176\u4e0a\u63d0\u4f9b collection \u65b9\u6cd5\u548c rollback \u65b9\u6cd5\u3002collection \u65b9\u6cd5\u7528\u4e8e\u53d6\u6570\u636e\u5e93\u96c6\u5408\u8bb0\u5f55\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\uff0crollback \u65b9\u6cd5\u7528\u4e8e\u5728\u4e0d\u60f3\u7ee7\u7eed\u6267\u884c\u4e8b\u52a1\u65f6\u7ec8\u6b62\u5e76\u56de\u6eda\u4e8b\u52a1\u3002<\/p>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u5fc5\u987b\u4e3a async \u5f02\u6b65\u51fd\u6570\u6216\u8fd4\u56de Promise \u7684\u51fd\u6570\uff0c\u5f53\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u8fd4\u56de\u65f6\uff0cSDK \u4f1a\u8ba4\u4e3a\u7528\u6237\u903b\u8f91\u5df2\u5b8c\u6210\uff0c\u81ea\u52a8\u63d0\u4ea4\uff08commit\uff09\u4e8b\u52a1\uff0c\u56e0\u6b64\u52a1\u5fc5\u786e\u4fdd\u7528\u6237\u4e8b\u52a1\u903b\u8f91\u5b8c\u6210\u540e\u624d\u5728 async \u5f02\u6b65\u51fd\u6570\u4e2d\u8fd4\u56de\u6216 resolve Promise\u3002<\/p>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u53ef\u80fd\u4f1a\u88ab\u6267\u884c\u591a\u6b21\uff0c\u5728\u5185\u90e8\u53d1\u73b0\u4e8b\u52a1\u51b2\u7a81\u65f6\u4f1a\u81ea\u52a8\u91cd\u590d\u6267\u884c\uff0c\u5982\u679c\u8d85\u8fc7\u8bbe\u5b9a\u7684\u6267\u884c\u6b21\u6570\u4e0a\u9650\uff0c\u4f1a\u62a5\u9519\u9000\u51fa\u3002<\/p>\n

\u5728\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u4e2d\u53d1\u751f\u7684\u9519\u8bef\uff0c\u90fd\u4f1a\u8ba4\u4e3a\u4e8b\u52a1\u6267\u884c\u5931\u8d25\u800c\u629b\u9519\u3002<\/p>\n

\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u8fd4\u56de\u7684\u503c\u4f1a\u4f5c\u4e3a runTransaction \u8fd4\u56de\u7684 Promise resolve \u7684\u503c\uff0c\u5728\u51fd\u6570\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\u4f1a\u4f5c\u4e3a runTransaction \u8fd4\u56de\u7684 Promise reject \u7684\u503c\uff0c\u5982\u679c\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u4e2d\u8c03\u7528\u4e86 transaction.rollback\uff0c\u5219\u4f20\u5165 rollback \u51fd\u6570\u7684\u503c\u4f1a\u4f5c\u4e3a runTransaction \u8fd4\u56de\u7684 Promise reject \u7684\u503c\u3002<\/p>\n

\u9650\u5236<\/h2>\n

\u4e8b\u52a1\u73b0\u4ec5\u652f\u6301\u5728\u4e91\u51fd\u6570 wx-server-sdk \u4f7f\u7528\u3002\u4e8b\u52a1\u64cd\u4f5c\u65f6\u4e3a\u4fdd\u969c\u6548\u7387\u548c\u5e76\u53d1\u6027\uff0c\u53ea\u5141\u8bb8\u8fdb\u884c\u5355\u8bb0\u5f55\u64cd\u4f5c\uff0c\u4e0d\u5141\u8bb8\u8fdb\u884c\u6279\u91cf\u64cd\u4f5c\uff0c\u4f46\u53ef\u4ee5\u5728\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u5bf9\u591a\u4e2a\u8bb0\u5f55\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n

\u6ce8\u610f\u4e8b\u9879<\/h2>\n

\u5f00\u53d1\u8005\u63d0\u4f9b\u7684\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u6b63\u5e38\u8fd4\u56de\u65f6\uff0cSDK \u4f1a\u81ea\u52a8\u63d0\u4ea4\uff08commit\uff09\u4e8b\u52a1\uff0c\u8bf7\u52ff\u5728\u4e8b\u52a1\u6267\u884c\u51fd\u6570\u5185\u8c03\u7528 transaction.commit \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4ec5\u5728\u901a\u8fc7 db.startTransaction \u8fdb\u884c\u4e8b\u52a1\u64cd\u4f5c\u65f6\u4f7f\u7528\u3002<\/p>\n

\u793a\u4f8b\u4ee3\u7801<\/h2>\n

\u4e24\u4e2a\u8d26\u6237\u4e4b\u95f4\u8fdb\u884c\u8f6c\u8d26\u7684\u7b80\u6613\u793a\u4f8b<\/p>\n

const cloud = require('wx-server-sdk')\ncloud.init({\n  env: cloud.DYNAMIC_CURRENT_ENV\n})\nconst db = cloud.database({\n  throwOnNotFound: false,\n})\nconst _ = db.command\n\nexports.main = async (event) => {\n  try {\n    const result = await db.runTransaction(async transaction => {\n      const aaaRes = await transaction.collection('account').doc('aaa').get()\n      const bbbRes = await transaction.collection('account').doc('bbb').get()\n\n      if (aaaRes.data && bbbRes.data) {\n        const updateAAARes = await transaction.collection('account').doc('aaa').update({\n          data: {\n            amount: _.inc(-10)\n          }\n        })\n\n        const updateBBBRes = await transaction.collection('account').doc('bbb').update({\n          data: {\n            amount: _.inc(10)\n          }\n        })\n\n        console.log(`transaction succeeded`)\n\n        \/\/ \u4f1a\u4f5c\u4e3a runTransaction resolve \u7684\u7ed3\u679c\u8fd4\u56de\n        return {\n          aaaAccount: aaaRes.data.amount - 10,\n        }\n      } else {\n        \/\/ \u4f1a\u4f5c\u4e3a runTransaction reject \u7684\u7ed3\u679c\u51fa\u53bb\n        await transaction.rollback(-100)\n      }\n    })\n\n    return {\n      success: true,\n      aaaAccount: result.aaaAccount,\n    }\n  } catch (e) {\n    console.error(`transaction error`, e)\n\n    return {\n      success: false,\n      error: e\n    }\n  }\n}<\/code><\/pre>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Database.runTransaction(callback: function, times: numb […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182398],"tags":[],"class_list":["post-184954","post","type-post","status-publish","format-standard","hentry","category-mini-program"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/184954","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=184954"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/184954\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=184954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=184954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=184954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}