条件付きでの値の書き込み(HBase)
コレクションでコンテンツを整理
必要に応じて、コンテンツの保存と分類を行います。
条件付き書き込みリクエストを送信します。このタイプの書き込みは、CheckAndMutateRow API リクエストを行います。
もっと見る
このコードサンプルを含む詳細なドキュメントについては、以下をご覧ください。
コードサンプル
特に記載のない限り、このページのコンテンツはクリエイティブ・コモンズの表示 4.0 ライセンスにより使用許諾されます。コードサンプルは Apache 2.0 ライセンスにより使用許諾されます。詳しくは、Google Developers サイトのポリシーをご覧ください。Java は Oracle および関連会社の登録商標です。
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis code demonstrates how to send a conditional write request using the CheckAndMutateRow API in Google Cloud Bigtable.\u003c/p\u003e\n"],["\u003cp\u003eThe example uses Java to connect to a Bigtable instance, create a row mutation, and apply a conditional check before writing data.\u003c/p\u003e\n"],["\u003cp\u003eThe code sets up a conditional check to ensure that data is written only if the "os_build" column's value is greater than or equal to "PQ2A.190405".\u003c/p\u003e\n"],["\u003cp\u003eThe provided sample code includes the necessary imports and details how to authenticate and connect to a Bigtable instance.\u003c/p\u003e\n"]]],[],null,["Send a conditional write request. This type of write makes a CheckAndMutateRow API request.\n\nExplore further\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Write examples](/bigtable/docs/writing-data)\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\n import com.google.cloud.bigtable.hbase.BigtableConfiguration;\n import org.apache.hadoop.hbase.TableName;\n import org.apache.hadoop.hbase.client.Connection;\n import org.apache.hadoop.hbase.client.Put;\n import org.apache.hadoop.hbase.client.RowMutations;\n import org.apache.hadoop.hbase.client.Table;\n import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;\n import org.apache.hadoop.hbase.util.Bytes;\n\n public class WriteConditionally {\n\n private static final byte[] COLUMN_FAMILY_NAME = Bytes.toBytes(\"stats_summary\");\n\n public static void writeConditionally(String projectId, String instanceId, String tableId) {\n // String projectId = \"my-project-id\";\n // String instanceId = \"my-instance-id\";\n // String tableId = \"mobile-time-series\";\n\n try (Connection connection = BigtableConfiguration.connect(projectId, instanceId)) {\n Table table = connection.getTable(TableName.valueOf(Bytes.toBytes(tableId)));\n long timestamp = System.currentTimeMillis();\n\n String rowKey = \"phone#4c410523#20190501\";\n RowMutations mutations = new RowMutations(Bytes.toBytes(rowKey));\n\n Put put = new Put(Bytes.toBytes(rowKey));\n put.addColumn(\n COLUMN_FAMILY_NAME, Bytes.toBytes(\"os_name\"), timestamp, Bytes.toBytes(\"android\"));\n mutations.add(put);\n\n table.checkAndMutate(\n Bytes.toBytes(rowKey),\n COLUMN_FAMILY_NAME,\n Bytes.toBytes(\"os_build\"),\n CompareOp.GREATER_OR_EQUAL,\n Bytes.toBytes(\"PQ2A.190405\"),\n mutations);\n\n System.out.print(\"Successfully updated row's os_name\");\n\n } catch (Exception e) {\n System.out.println(\"Error during WriteConditionally: \\n\" + e.toString());\n e.printStackTrace();\n }\n }\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)."]]