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Contoh Amazon Keyspaces menggunakan SDK untuk Java 2.x
Contoh kode berikut menunjukkan cara melakukan tindakan dan mengimplementasikan skenario umum dengan menggunakan AWS SDK for Java 2.x with Amazon Keyspaces.
Dasar-dasar adalah contoh kode yang menunjukkan kepada Anda bagaimana melakukan operasi penting dalam suatu layanan.
Tindakan adalah kutipan kode dari program yang lebih besar dan harus dijalankan dalam konteks. Sementara tindakan menunjukkan cara memanggil fungsi layanan individual, Anda dapat melihat tindakan dalam konteks dalam skenario terkait.
Setiap contoh menyertakan tautan ke kode sumber lengkap, di mana Anda dapat menemukan instruksi tentang cara mengatur dan menjalankan kode dalam konteks.
Memulai
Contoh kode berikut menunjukkan cara memulai menggunakan Amazon Keyspaces.
- SDKuntuk Java 2.x
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.keyspaces.KeyspacesClient; import software.amazon.awssdk.services.keyspaces.model.KeyspaceSummary; import software.amazon.awssdk.services.keyspaces.model.KeyspacesException; import software.amazon.awssdk.services.keyspaces.model.ListKeyspacesRequest; import software.amazon.awssdk.services.keyspaces.model.ListKeyspacesResponse; import java.util.List; /** * Before running this Java (v2) code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class HelloKeyspaces { public static void main(String[] args) { Region region = Region.US_EAST_1; KeyspacesClient keyClient = KeyspacesClient.builder() .region(region) .build(); listKeyspaces(keyClient); } public static void listKeyspaces(KeyspacesClient keyClient) { try { ListKeyspacesRequest keyspacesRequest = ListKeyspacesRequest.builder() .maxResults(10) .build(); ListKeyspacesResponse response = keyClient.listKeyspaces(keyspacesRequest); List<KeyspaceSummary> keyspaces = response.keyspaces(); for (KeyspaceSummary keyspace : keyspaces) { System.out.println("The name of the keyspace is " + keyspace.keyspaceName()); } } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
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Untuk API detailnya, lihat ListKeyspacesdi AWS SDK for Java 2.x APIReferensi.
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Hal-hal mendasar
Contoh kode berikut ini menunjukkan cara:
Buat keyspace dan tabel. Skema tabel menyimpan data film dan mengaktifkan point-in-time pemulihan.
Connect ke keyspace menggunakan TLS koneksi aman dengan otentikasi SiGv4.
Kueri tabel. Tambahkan, ambil, dan perbarui data film.
Perbarui tabel. Tambahkan kolom untuk melacak film yang ditonton.
Kembalikan tabel ke keadaan sebelumnya dan bersihkan sumber daya.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. /** * Before running this Java (v2) code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html * * Before running this Java code example, you must create a * Java keystore (JKS) file and place it in your project's resources folder. * * This file is a secure file format used to hold certificate information for * Java applications. This is required to make a connection to Amazon Keyspaces. * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/keyspaces/latest/devguide/using_java_driver.html * * This Java example performs the following tasks: * * 1. Create a keyspace. * 2. Check for keyspace existence. * 3. List keyspaces using a paginator. * 4. Create a table with a simple movie data schema and enable point-in-time * recovery. * 5. Check for the table to be in an Active state. * 6. List all tables in the keyspace. * 7. Use a Cassandra driver to insert some records into the Movie table. * 8. Get all records from the Movie table. * 9. Get a specific Movie. * 10. Get a UTC timestamp for the current time. * 11. Update the table schema to add a ‘watched’ Boolean column. * 12. Update an item as watched. * 13. Query for items with watched = True. * 14. Restore the table back to the previous state using the timestamp. * 15. Check for completion of the restore action. * 16. Delete the table. * 17. Confirm that both tables are deleted. * 18. Delete the keyspace. */ public class ScenarioKeyspaces { public static final String DASHES = new String(new char[80]).replace("\0", "-"); /* * Usage: * fileName - The name of the JSON file that contains movie data. (Get this file * from the GitHub repo at resources/sample_file.) * keyspaceName - The name of the keyspace to create. */ public static void main(String[] args) throws InterruptedException, IOException { String fileName = "<Replace with the JSON file that contains movie data>"; String keyspaceName = "<Replace with the name of the keyspace to create>"; String titleUpdate = "The Family"; int yearUpdate = 2013; String tableName = "Movie"; String tableNameRestore = "MovieRestore"; Region region = Region.US_EAST_1; KeyspacesClient keyClient = KeyspacesClient.builder() .region(region) .build(); DriverConfigLoader loader = DriverConfigLoader.fromClasspath("application.conf"); CqlSession session = CqlSession.builder() .withConfigLoader(loader) .build(); System.out.println(DASHES); System.out.println("Welcome to the Amazon Keyspaces example scenario."); System.out.println(DASHES); System.out.println(DASHES); System.out.println("1. Create a keyspace."); createKeySpace(keyClient, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); Thread.sleep(5000); System.out.println("2. Check for keyspace existence."); checkKeyspaceExistence(keyClient, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("3. List keyspaces using a paginator."); listKeyspacesPaginator(keyClient); System.out.println(DASHES); System.out.println(DASHES); System.out.println("4. Create a table with a simple movie data schema and enable point-in-time recovery."); createTable(keyClient, keyspaceName, tableName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("5. Check for the table to be in an Active state."); Thread.sleep(6000); checkTable(keyClient, keyspaceName, tableName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("6. List all tables in the keyspace."); listTables(keyClient, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("7. Use a Cassandra driver to insert some records into the Movie table."); Thread.sleep(6000); loadData(session, fileName, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("8. Get all records from the Movie table."); getMovieData(session, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("9. Get a specific Movie."); getSpecificMovie(session, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("10. Get a UTC timestamp for the current time."); ZonedDateTime utc = ZonedDateTime.now(ZoneOffset.UTC); System.out.println("DATETIME = " + Date.from(utc.toInstant())); System.out.println(DASHES); System.out.println(DASHES); System.out.println("11. Update the table schema to add a watched Boolean column."); updateTable(keyClient, keyspaceName, tableName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("12. Update an item as watched."); Thread.sleep(10000); // Wait 10 secs for the update. updateRecord(session, keyspaceName, titleUpdate, yearUpdate); System.out.println(DASHES); System.out.println(DASHES); System.out.println("13. Query for items with watched = True."); getWatchedData(session, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("14. Restore the table back to the previous state using the timestamp."); System.out.println("Note that the restore operation can take up to 20 minutes."); restoreTable(keyClient, keyspaceName, utc); System.out.println(DASHES); System.out.println(DASHES); System.out.println("15. Check for completion of the restore action."); Thread.sleep(5000); checkRestoredTable(keyClient, keyspaceName, "MovieRestore"); System.out.println(DASHES); System.out.println(DASHES); System.out.println("16. Delete both tables."); deleteTable(keyClient, keyspaceName, tableName); deleteTable(keyClient, keyspaceName, tableNameRestore); System.out.println(DASHES); System.out.println(DASHES); System.out.println("17. Confirm that both tables are deleted."); checkTableDelete(keyClient, keyspaceName, tableName); checkTableDelete(keyClient, keyspaceName, tableNameRestore); System.out.println(DASHES); System.out.println(DASHES); System.out.println("18. Delete the keyspace."); deleteKeyspace(keyClient, keyspaceName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("The scenario has completed successfully."); System.out.println(DASHES); } public static void deleteKeyspace(KeyspacesClient keyClient, String keyspaceName) { try { DeleteKeyspaceRequest deleteKeyspaceRequest = DeleteKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); keyClient.deleteKeyspace(deleteKeyspaceRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void checkTableDelete(KeyspacesClient keyClient, String keyspaceName, String tableName) throws InterruptedException { try { String status; GetTableResponse response; GetTableRequest tableRequest = GetTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); // Keep looping until table cannot be found and a ResourceNotFoundException is // thrown. while (true) { response = keyClient.getTable(tableRequest); status = response.statusAsString(); System.out.println(". The table status is " + status); Thread.sleep(500); } } catch (ResourceNotFoundException e) { System.err.println(e.awsErrorDetails().errorMessage()); } System.out.println("The table is deleted"); } public static void deleteTable(KeyspacesClient keyClient, String keyspaceName, String tableName) { try { DeleteTableRequest tableRequest = DeleteTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); keyClient.deleteTable(tableRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void checkRestoredTable(KeyspacesClient keyClient, String keyspaceName, String tableName) throws InterruptedException { try { boolean tableStatus = false; String status; GetTableResponse response = null; GetTableRequest tableRequest = GetTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); while (!tableStatus) { response = keyClient.getTable(tableRequest); status = response.statusAsString(); System.out.println("The table status is " + status); if (status.compareTo("ACTIVE") == 0) { tableStatus = true; } Thread.sleep(500); } List<ColumnDefinition> cols = response.schemaDefinition().allColumns(); for (ColumnDefinition def : cols) { System.out.println("The column name is " + def.name()); System.out.println("The column type is " + def.type()); } } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void restoreTable(KeyspacesClient keyClient, String keyspaceName, ZonedDateTime utc) { try { Instant myTime = utc.toInstant(); RestoreTableRequest restoreTableRequest = RestoreTableRequest.builder() .restoreTimestamp(myTime) .sourceTableName("Movie") .targetKeyspaceName(keyspaceName) .targetTableName("MovieRestore") .sourceKeyspaceName(keyspaceName) .build(); RestoreTableResponse response = keyClient.restoreTable(restoreTableRequest); System.out.println("The ARN of the restored table is " + response.restoredTableARN()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void getWatchedData(CqlSession session, String keyspaceName) { ResultSet resultSet = session .execute("SELECT * FROM \"" + keyspaceName + "\".\"Movie\" WHERE watched = true ALLOW FILTERING;"); resultSet.forEach(item -> { System.out.println("The Movie title is " + item.getString("title")); System.out.println("The Movie year is " + item.getInt("year")); System.out.println("The plot is " + item.getString("plot")); }); } public static void updateRecord(CqlSession session, String keySpace, String titleUpdate, int yearUpdate) { String sqlStatement = "UPDATE \"" + keySpace + "\".\"Movie\" SET watched=true WHERE title = :k0 AND year = :k1;"; BatchStatementBuilder builder = BatchStatement.builder(DefaultBatchType.UNLOGGED); builder.setConsistencyLevel(ConsistencyLevel.LOCAL_QUORUM); PreparedStatement preparedStatement = session.prepare(sqlStatement); builder.addStatement(preparedStatement.boundStatementBuilder() .setString("k0", titleUpdate) .setInt("k1", yearUpdate) .build()); BatchStatement batchStatement = builder.build(); session.execute(batchStatement); } public static void updateTable(KeyspacesClient keyClient, String keySpace, String tableName) { try { ColumnDefinition def = ColumnDefinition.builder() .name("watched") .type("boolean") .build(); UpdateTableRequest tableRequest = UpdateTableRequest.builder() .keyspaceName(keySpace) .tableName(tableName) .addColumns(def) .build(); keyClient.updateTable(tableRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void getSpecificMovie(CqlSession session, String keyspaceName) { ResultSet resultSet = session.execute( "SELECT * FROM \"" + keyspaceName + "\".\"Movie\" WHERE title = 'The Family' ALLOW FILTERING ;"); resultSet.forEach(item -> { System.out.println("The Movie title is " + item.getString("title")); System.out.println("The Movie year is " + item.getInt("year")); System.out.println("The plot is " + item.getString("plot")); }); } // Get records from the Movie table. public static void getMovieData(CqlSession session, String keyspaceName) { ResultSet resultSet = session.execute("SELECT * FROM \"" + keyspaceName + "\".\"Movie\";"); resultSet.forEach(item -> { System.out.println("The Movie title is " + item.getString("title")); System.out.println("The Movie year is " + item.getInt("year")); System.out.println("The plot is " + item.getString("plot")); }); } // Load data into the table. public static void loadData(CqlSession session, String fileName, String keySpace) throws IOException { String sqlStatement = "INSERT INTO \"" + keySpace + "\".\"Movie\" (title, year, plot) values (:k0, :k1, :k2)"; JsonParser parser = new JsonFactory().createParser(new File(fileName)); com.fasterxml.jackson.databind.JsonNode rootNode = new ObjectMapper().readTree(parser); Iterator<JsonNode> iter = rootNode.iterator(); ObjectNode currentNode; int t = 0; while (iter.hasNext()) { // Add 20 movies to the table. if (t == 20) break; currentNode = (ObjectNode) iter.next(); int year = currentNode.path("year").asInt(); String title = currentNode.path("title").asText(); String plot = currentNode.path("info").path("plot").toString(); // Insert the data into the Amazon Keyspaces table. BatchStatementBuilder builder = BatchStatement.builder(DefaultBatchType.UNLOGGED); builder.setConsistencyLevel(ConsistencyLevel.LOCAL_QUORUM); PreparedStatement preparedStatement = session.prepare(sqlStatement); builder.addStatement(preparedStatement.boundStatementBuilder() .setString("k0", title) .setInt("k1", year) .setString("k2", plot) .build()); BatchStatement batchStatement = builder.build(); session.execute(batchStatement); t++; } System.out.println("You have added " + t + " records successfully!"); } public static void listTables(KeyspacesClient keyClient, String keyspaceName) { try { ListTablesRequest tablesRequest = ListTablesRequest.builder() .keyspaceName(keyspaceName) .build(); ListTablesIterable listRes = keyClient.listTablesPaginator(tablesRequest); listRes.stream() .flatMap(r -> r.tables().stream()) .forEach(content -> System.out.println(" ARN: " + content.resourceArn() + " Table name: " + content.tableName())); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void checkTable(KeyspacesClient keyClient, String keyspaceName, String tableName) throws InterruptedException { try { boolean tableStatus = false; String status; GetTableResponse response = null; GetTableRequest tableRequest = GetTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); while (!tableStatus) { response = keyClient.getTable(tableRequest); status = response.statusAsString(); System.out.println(". The table status is " + status); if (status.compareTo("ACTIVE") == 0) { tableStatus = true; } Thread.sleep(500); } List<ColumnDefinition> cols = response.schemaDefinition().allColumns(); for (ColumnDefinition def : cols) { System.out.println("The column name is " + def.name()); System.out.println("The column type is " + def.type()); } } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void createTable(KeyspacesClient keyClient, String keySpace, String tableName) { try { // Set the columns. ColumnDefinition defTitle = ColumnDefinition.builder() .name("title") .type("text") .build(); ColumnDefinition defYear = ColumnDefinition.builder() .name("year") .type("int") .build(); ColumnDefinition defReleaseDate = ColumnDefinition.builder() .name("release_date") .type("timestamp") .build(); ColumnDefinition defPlot = ColumnDefinition.builder() .name("plot") .type("text") .build(); List<ColumnDefinition> colList = new ArrayList<>(); colList.add(defTitle); colList.add(defYear); colList.add(defReleaseDate); colList.add(defPlot); // Set the keys. PartitionKey yearKey = PartitionKey.builder() .name("year") .build(); PartitionKey titleKey = PartitionKey.builder() .name("title") .build(); List<PartitionKey> keyList = new ArrayList<>(); keyList.add(yearKey); keyList.add(titleKey); SchemaDefinition schemaDefinition = SchemaDefinition.builder() .partitionKeys(keyList) .allColumns(colList) .build(); PointInTimeRecovery timeRecovery = PointInTimeRecovery.builder() .status(PointInTimeRecoveryStatus.ENABLED) .build(); CreateTableRequest tableRequest = CreateTableRequest.builder() .keyspaceName(keySpace) .tableName(tableName) .schemaDefinition(schemaDefinition) .pointInTimeRecovery(timeRecovery) .build(); CreateTableResponse response = keyClient.createTable(tableRequest); System.out.println("The table ARN is " + response.resourceArn()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void listKeyspacesPaginator(KeyspacesClient keyClient) { try { ListKeyspacesRequest keyspacesRequest = ListKeyspacesRequest.builder() .maxResults(10) .build(); ListKeyspacesIterable listRes = keyClient.listKeyspacesPaginator(keyspacesRequest); listRes.stream() .flatMap(r -> r.keyspaces().stream()) .forEach(content -> System.out.println(" Name: " + content.keyspaceName())); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void checkKeyspaceExistence(KeyspacesClient keyClient, String keyspaceName) { try { GetKeyspaceRequest keyspaceRequest = GetKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); GetKeyspaceResponse response = keyClient.getKeyspace(keyspaceRequest); String name = response.keyspaceName(); System.out.println("The " + name + " KeySpace is ready"); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void createKeySpace(KeyspacesClient keyClient, String keyspaceName) { try { CreateKeyspaceRequest keyspaceRequest = CreateKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); CreateKeyspaceResponse response = keyClient.createKeyspace(keyspaceRequest); System.out.println("The ARN of the KeySpace is " + response.resourceArn()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
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Untuk API detailnya, lihat topik berikut di AWS SDK for Java 2.x APIReferensi.
-
Tindakan
Contoh kode berikut menunjukkan cara menggunakanCreateKeyspace
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void createKeySpace(KeyspacesClient keyClient, String keyspaceName) { try { CreateKeyspaceRequest keyspaceRequest = CreateKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); CreateKeyspaceResponse response = keyClient.createKeyspace(keyspaceRequest); System.out.println("The ARN of the KeySpace is " + response.resourceArn()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat CreateKeyspacedi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanCreateTable
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void createTable(KeyspacesClient keyClient, String keySpace, String tableName) { try { // Set the columns. ColumnDefinition defTitle = ColumnDefinition.builder() .name("title") .type("text") .build(); ColumnDefinition defYear = ColumnDefinition.builder() .name("year") .type("int") .build(); ColumnDefinition defReleaseDate = ColumnDefinition.builder() .name("release_date") .type("timestamp") .build(); ColumnDefinition defPlot = ColumnDefinition.builder() .name("plot") .type("text") .build(); List<ColumnDefinition> colList = new ArrayList<>(); colList.add(defTitle); colList.add(defYear); colList.add(defReleaseDate); colList.add(defPlot); // Set the keys. PartitionKey yearKey = PartitionKey.builder() .name("year") .build(); PartitionKey titleKey = PartitionKey.builder() .name("title") .build(); List<PartitionKey> keyList = new ArrayList<>(); keyList.add(yearKey); keyList.add(titleKey); SchemaDefinition schemaDefinition = SchemaDefinition.builder() .partitionKeys(keyList) .allColumns(colList) .build(); PointInTimeRecovery timeRecovery = PointInTimeRecovery.builder() .status(PointInTimeRecoveryStatus.ENABLED) .build(); CreateTableRequest tableRequest = CreateTableRequest.builder() .keyspaceName(keySpace) .tableName(tableName) .schemaDefinition(schemaDefinition) .pointInTimeRecovery(timeRecovery) .build(); CreateTableResponse response = keyClient.createTable(tableRequest); System.out.println("The table ARN is " + response.resourceArn()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat CreateTabledi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanDeleteKeyspace
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void deleteKeyspace(KeyspacesClient keyClient, String keyspaceName) { try { DeleteKeyspaceRequest deleteKeyspaceRequest = DeleteKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); keyClient.deleteKeyspace(deleteKeyspaceRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat DeleteKeyspacedi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanDeleteTable
.
- SDKuntuk Java 2.x
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void deleteTable(KeyspacesClient keyClient, String keyspaceName, String tableName) { try { DeleteTableRequest tableRequest = DeleteTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); keyClient.deleteTable(tableRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat DeleteTabledi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanGetKeyspace
.
- SDKuntuk Java 2.x
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void checkKeyspaceExistence(KeyspacesClient keyClient, String keyspaceName) { try { GetKeyspaceRequest keyspaceRequest = GetKeyspaceRequest.builder() .keyspaceName(keyspaceName) .build(); GetKeyspaceResponse response = keyClient.getKeyspace(keyspaceRequest); String name = response.keyspaceName(); System.out.println("The " + name + " KeySpace is ready"); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat GetKeyspacedi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanGetTable
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void checkTable(KeyspacesClient keyClient, String keyspaceName, String tableName) throws InterruptedException { try { boolean tableStatus = false; String status; GetTableResponse response = null; GetTableRequest tableRequest = GetTableRequest.builder() .keyspaceName(keyspaceName) .tableName(tableName) .build(); while (!tableStatus) { response = keyClient.getTable(tableRequest); status = response.statusAsString(); System.out.println(". The table status is " + status); if (status.compareTo("ACTIVE") == 0) { tableStatus = true; } Thread.sleep(500); } List<ColumnDefinition> cols = response.schemaDefinition().allColumns(); for (ColumnDefinition def : cols) { System.out.println("The column name is " + def.name()); System.out.println("The column type is " + def.type()); } } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat GetTabledi AWS SDK for Java 2.x APIReferensi.
-
Contoh kode berikut menunjukkan cara menggunakanListKeyspaces
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void listKeyspacesPaginator(KeyspacesClient keyClient) { try { ListKeyspacesRequest keyspacesRequest = ListKeyspacesRequest.builder() .maxResults(10) .build(); ListKeyspacesIterable listRes = keyClient.listKeyspacesPaginator(keyspacesRequest); listRes.stream() .flatMap(r -> r.keyspaces().stream()) .forEach(content -> System.out.println(" Name: " + content.keyspaceName())); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat ListKeyspacesdi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanListTables
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void listTables(KeyspacesClient keyClient, String keyspaceName) { try { ListTablesRequest tablesRequest = ListTablesRequest.builder() .keyspaceName(keyspaceName) .build(); ListTablesIterable listRes = keyClient.listTablesPaginator(tablesRequest); listRes.stream() .flatMap(r -> r.tables().stream()) .forEach(content -> System.out.println(" ARN: " + content.resourceArn() + " Table name: " + content.tableName())); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat ListTablesdi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanRestoreTable
.
- SDKuntuk Java 2.x
-
catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void restoreTable(KeyspacesClient keyClient, String keyspaceName, ZonedDateTime utc) { try { Instant myTime = utc.toInstant(); RestoreTableRequest restoreTableRequest = RestoreTableRequest.builder() .restoreTimestamp(myTime) .sourceTableName("Movie") .targetKeyspaceName(keyspaceName) .targetTableName("MovieRestore") .sourceKeyspaceName(keyspaceName) .build(); RestoreTableResponse response = keyClient.restoreTable(restoreTableRequest); System.out.println("The ARN of the restored table is " + response.restoredTableARN()); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat RestoreTabledi AWS SDK for Java 2.x APIReferensi.
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Contoh kode berikut menunjukkan cara menggunakanUpdateTable
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- SDKuntuk Java 2.x
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catatan
Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS
. public static void updateTable(KeyspacesClient keyClient, String keySpace, String tableName) { try { ColumnDefinition def = ColumnDefinition.builder() .name("watched") .type("boolean") .build(); UpdateTableRequest tableRequest = UpdateTableRequest.builder() .keyspaceName(keySpace) .tableName(tableName) .addColumns(def) .build(); keyClient.updateTable(tableRequest); } catch (KeyspacesException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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Untuk API detailnya, lihat UpdateTabledi AWS SDK for Java 2.x APIReferensi.
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