Use describeTable no Tablestore SDK for Java para obter o esquema, a configuração e os metadados de uma tabela de dados.
Pré-requisitos
Inicialize um cliente. Para mais informações, consulte Inicializar um cliente do Tablestore.
Método
public DescribeTableResponse describeTable(DescribeTableRequest request) throws TableStoreException, ClientExceptionCódigo de exemplo
O exemplo a seguir obtém informações da tabela de dados test_table, incluindo esquema, configuração, definições de Stream, configurações de criptografia, throughput reservado e índices secundários.
public static void describeTableExample(SyncClient client) {
DescribeTableRequest request = new DescribeTableRequest("test_table");
DescribeTableResponse response = client.describeTable(request);
// Query the schema information of the data table.
TableMeta tableMeta = response.getTableMeta();
System.out.println("* Data table name: " + tableMeta.getTableName());
System.out.println("* Primary key information");
for(PrimaryKeySchema primaryKeySchema : tableMeta.getPrimaryKeyList()) {
System.out.println(primaryKeySchema);
}
System.out.println("* Predefined column information");
for(DefinedColumnSchema definedColumnSchema : tableMeta.getDefinedColumnsList()) {
System.out.println(definedColumnSchema);
}
// Query the configuration information of the data table.
TableOptions tableOptions = response.getTableOptions();
System.out.println("* Table configuration information");
System.out.println("Max versions: " + tableOptions.getMaxVersions());
System.out.println("Time to live: " + tableOptions.getTimeToLive());
System.out.println("Max version offset: " + tableOptions.getMaxTimeDeviation());
System.out.println("Whether to allow updates: " + tableOptions.getAllowUpdate());
// Query the Stream information of the data table.
StreamDetails streamDetails = response.getStreamDetails();
System.out.println("* Whether to enable Stream: " + streamDetails.isEnableStream());
if(streamDetails.isEnableStream())
System.out.println("Stream validity period: " + streamDetails.getExpirationTime());
// Query the encryption settings of the data table.
SSEDetails sseDetails = response.getSseDetails();
System.out.println("* Whether to enable encryption for the data table: " + sseDetails.isEnable());
if(sseDetails.isEnable())
System.out.println("Encryption method: " + sseDetails.getKeyType());
// Query the reserved read/write throughput of the data table.
ReservedThroughputDetails reservedThroughputDetails = response.getReservedThroughputDetails();
System.out.println("* Reserved read/write throughput");
System.out.println("Reserved read throughput: " + reservedThroughputDetails.getCapacityUnit().getReadCapacityUnit());
System.out.println("Reserved write throughput: " + reservedThroughputDetails.getCapacityUnit().getWriteCapacityUnit());
// Query information of the secondary index.
for(IndexMeta indexMeta : response.getIndexMeta()) {
System.out.println("* Secondary index name: " + indexMeta.getIndexName());
System.out.println("Primary key columns: " + indexMeta.getPrimaryKeyList().toString());
System.out.println("Predefined columns: " + indexMeta.getDefinedColumnsList().toString());
System.out.println("Secondary index type: " + indexMeta.getIndexType());
System.out.println("Secondary index update mode: " + indexMeta.getIndexUpdateMode());
}
}