限制每個資料欄的儲存格數量 (HBase)
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
為每個資料欄的儲存格建立限制篩選器。
深入探索
如需包含這個程式碼範例的詳細說明文件,請參閱下列內容:
程式碼範例
Java
如要瞭解如何安裝及使用 Bigtable 的用戶端程式庫,請參閱這篇文章。
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詳情請參閱「為本機開發環境設定驗證」。
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[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content focuses on a filter that limits the number of cells per column in a Bigtable table.\u003c/p\u003e\n"],["\u003cp\u003eThe provided Java code demonstrates how to implement this filter, restricting the scan to the most recent 2 versions in each column.\u003c/p\u003e\n"],["\u003cp\u003eThe filter is used via a \u003ccode\u003eScan\u003c/code\u003e object, employing the \u003ccode\u003esetMaxVersions(2)\u003c/code\u003e method, to achieve the desired limit.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation includes links to additional resources on using filters in Bigtable, and how to set up authentication and use the client libraries.\u003c/p\u003e\n"]]],[],null,["Creates a limiting filter on cells per column.\n\nExplore further\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Use filters](/bigtable/docs/using-filters)\n\nCode sample \n\nJava\n\n\nTo learn how to install and use the client library for Bigtable, see\n[Bigtable client libraries](/bigtable/docs/reference/libraries).\n\n\nTo authenticate to Bigtable, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n public static void filterLimitCellsPerCol() {\n // TODO(developer): Replace these variables before running the sample.\n String projectId = \"my-project-id\";\n String instanceId = \"my-instance-id\";\n String tableId = \"mobile-time-series\";\n filterLimitCellsPerCol(projectId, instanceId, tableId);\n }\n\n public static void filterLimitCellsPerCol(String projectId, String instanceId, String tableId) {\n // A filter that matches only the most recent 2 cells within each column\n Scan scan = new Scan().setMaxVersions(2);\n readWithFilter(projectId, instanceId, tableId, scan);\n }\n\nWhat's next\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=bigtable)."]]