Package org.odpi.openmetadata.frameworks.connectors

Interface ReadableTabularDataSource

All Known Implementing Classes:
CSVFileStoreConnector, PostgresTabularDataSourceConnector, ReferenceDataSetConnectorBase, ValidValueDataSetConnector, ValidValueSetListConnector
public interface ReadableTabularDataSource
ReadableTabularDataSource defines the specific connector api for reading simple tabular data. Each row represents a record that is divided into columns. Each row has the same list of columns and so the data source is effectively a table of data.

  • Method Details

    • getRecordCount

      long getRecordCount() throws ConnectorCheckedException
      Return the number of records in the data source.
      Returns:
      count
      Throws:
      ConnectorCheckedException - there is a problem accessing the data

    • getColumnDescriptions

      List<TabularColumnDescription> getColumnDescriptions() throws ConnectorCheckedException
      Return the list of column descriptions associated with this data source. The information should be sufficient to define the schema in a target data store.
      Returns:
      a list of column descriptions or null if not available.
      Throws:
      ConnectorCheckedException - there is a problem accessing the data

    • getColumnNumber

      int getColumnNumber(String columnName) throws ConnectorCheckedException
      Locate the named column. A negative number means the column is not present.
      Parameters:
      columnName - name of the column to return
      Returns:
      column
      Throws:
      ConnectorCheckedException - problem extracting the column descriptions

    • readRecord

      List<String> readRecord(long rowNumber) throws ConnectorCheckedException
      Return the requested data record. The first record is record 0.
      Parameters:
      rowNumber - long
      Returns:
      list of values (as strings) where each string is the value from a column. The order is the same as the columns
      Throws:
      ConnectorCheckedException - there is a problem accessing the data.