限制每行单元格数 (HBase)
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
针对每行单元格数创建限制性过滤条件。
深入探索
如需查看包含此代码示例的详细文档,请参阅以下内容:
代码示例
如未另行说明,那么本页面中的内容已根据知识共享署名 4.0 许可获得了许可,并且代码示例已根据 Apache 2.0 许可获得了许可。有关详情,请参阅 Google 开发者网站政策。Java 是 Oracle 和/或其关联公司的注册商标。
[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content demonstrates how to implement a filter that limits the number of cells retrieved per row in a Bigtable table.\u003c/p\u003e\n"],["\u003cp\u003eThe code sample utilizes the \u003ccode\u003eColumnPaginationFilter\u003c/code\u003e to limit the results to the first 2 cells of each row.\u003c/p\u003e\n"],["\u003cp\u003eThe sample also points the user towards resources that allow them to learn about using other filters, as well as how to authenticate their Bigtable connection.\u003c/p\u003e\n"],["\u003cp\u003eYou can see other Google Cloud Product's Code samples using the Google Cloud Sample Browser.\u003c/p\u003e\n"]]],[],null,["Creates a limiting filter on cells per row.\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 filterLimitCellsPerRow() {\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 filterLimitCellsPerRow(projectId, instanceId, tableId);\n }\n\n public static void filterLimitCellsPerRow(String projectId, String instanceId, String tableId) {\n // A filter that matches the first 2 cells of each row\n // Filter filter = new ColumnCountGetFilter(2);\n Filter filter = new ColumnPaginationFilter(2, 0);\n\n Scan scan = new Scan().setFilter(filter);\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)."]]