Prompt: What does this code do?

class ExampleRow(NamedTuple):
    id: int
    name: str

class JdbcOptions(PipelineOptions):
    @classmethod
    def _add_argparse_args(cls, parser):
        parser.add_argument(
            '--table_name',
            help='Table name'
        )
        parser.add_argument(
            '--jdbc_url',
            help='JDBC URL'
        )
        parser.add_argument(
            '--driver_class_name',
            help='Driver class name'
        )
        parser.add_argument(
            '--username',
            help='Username'
        )
        parser.add_argument(
            '--password',
            help='Password'
        )

options = JdbcOptions()
coders.registry.register_coder(ExampleRow, coders.RowCoder)

with beam.Pipeline(options=options) as p:

    output = (p | 'Read from JDBC' >> ReadFromJdbc(
        table_name=options.table_name,
        driver_class_name=options.driver_class_name,
        jdbc_url=options.jdbc_url,
        username=options.username,
        password=options.password
        )
        | 'Log Data' >> Map(logging.info))

Response: This code reads data from an Oracle Java Database Connectivity (JDBC) enabled database using the ReadFromJdbc transform from the built-in JdbcIO connector.

class ExampleRow(NamedTuple):
    id: int
    name: str

This code defines a named tuple ExampleRow with two fields: id and name.

class JdbcOptions(PipelineOptions):
    @classmethod
    def _add_argparse_args(cls, parser):
        parser.add_argument(
            '--table_name',
            help='Table name'
        )
        parser.add_argument(
            '--jdbc_url',
            help='JDBC URL'
        )
        parser.add_argument(
            '--driver_class_name',
            help='Driver class name'
        )
        parser.add_argument(
            '--username',
            help='Username'
        )
        parser.add_argument(
            '--password',
            help='Password'
        )

options = JdbcOptions()

The JdbcOptions class defines the command-line arguments --table_name, --jdbc_url, --driver_class_name, --username, and --password, which specify the JDBC connection parameters. To parse command-line arguments, this code uses pipeline options.

coders.registry.register_coder(ExampleRow, coders.RowCoder)

This code registers a coder for the ExampleRow class. This is required for the ReadFromJdbc transform to read data from the table.

with beam.Pipeline(options=options) as p:

    output = (p | 'Read from JDBC' >> ReadFromJdbc(
        jdbc_url=options.jdbc_url,
        username=options.username,
        password=options.password,
        table_name=options.table_name,
        driver_class_name=options.driver_class_name
        )
        | 'Log Data' >> Map(logging.info))

The Apache Beam pipeline uses the JdbcOptions class to set the path to the database and the ReadFromJdbc transform to read data from the database via JDBC.