org.springframework.data.cassandra.core.cql

Interface RowMapper<T>

All Known Implementing Classes:

ColumnMapRowMapper, SingleColumnRowMapper

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface RowMapper<T>

An interface used by CqlTemplate for mapping rows of a ResultSet on a per-row basis. Implementations of this interface perform the actual work of mapping each row to a result object, but don't need to worry about exception handling. DriverExceptions will be caught and handled by the calling CqlTemplate.

Typically used either for CqlTemplate's query methods or for out parameters of stored procedures. RowMapper objects are typically stateless and thus reusable; they are an ideal choice for implementing row-mapping logic in a single place.

Author:

Matthew T. Adams, Mark Paluch

See Also:

RowCallbackHandler, ResultSetExtractor

Method Summary

Modifier and Type	Method and Description
T	mapRow(com.datastax.driver.core.Row row, int rowNum) Implementations must implement this method to map each row of data in the ResultSet.

Method Detail

mapRow

@Nullable
T mapRow(com.datastax.driver.core.Row row,
                   int rowNum)
            throws com.datastax.driver.core.exceptions.DriverException

Implementations must implement this method to map each row of data in the ResultSet.

Parameters:

row - the Row to map, must not be null.

rowNum - the number of the current row.

Returns:

the result object for the current row.

Throws:

com.datastax.driver.core.exceptions.DriverException - if a DriverException is encountered getting column values (that is, there's no need to catch DriverException)