使用限定詞規則運算式篩選器讀取 (HBase)
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使用規則運算式,在資料欄限定詞上建立限制性篩選器。
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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 demonstrates how to apply a regular expression filter to column qualifiers in Google Cloud Bigtable.\u003c/p\u003e\n"],["\u003cp\u003eThe provided Java code sample uses the \u003ccode\u003eQualifierFilter\u003c/code\u003e class along with \u003ccode\u003eRegexStringComparator\u003c/code\u003e to match cells based on a regex pattern in their column qualifiers.\u003c/p\u003e\n"],["\u003cp\u003eThe regex in the example code, "connected_.*$", targets column qualifiers that begin with "connected_".\u003c/p\u003e\n"],["\u003cp\u003eThe example also highlights relevant documentation on filters, client libraries, and setting up authentication for Bigtable.\u003c/p\u003e\n"]]],[],null,["# Read using a qualifier regex filter (HBase)\n\nCreates a limiting filter on a column qualifier with a regex.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Use filters](/bigtable/docs/using-filters)\n\nCode sample\n-----------\n\n### Java\n\n\nTo learn how to install and use the client library for Bigtable, see\n[Bigtable client libraries](/bigtable/docs/reference/libraries).\n\n\nTo authenticate to Bigtable, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n public static void filterLimitColQualifierRegex() {\n // TODO(developer): Replace these variables before running the sample.\n String projectId = \"my-project-id\";\n String instanceId = \"my-instance-id\";\n String tableId = \"mobile-time-series\";\n filterLimitColQualifierRegex(projectId, instanceId, tableId);\n }\n\n public static void filterLimitColQualifierRegex(\n String projectId, String instanceId, String tableId) {\n // A filter that matches cells whose column qualifier satisfies the given regex\n Filter filter =\n new QualifierFilter(CompareOp.EQUAL, new RegexStringComparator(\"connected_.*$\"));\n Scan scan = new Scan().setFilter(filter);\n readWithFilter(projectId, instanceId, tableId, scan);\n }\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=bigtable)."]]