Spring 5 Design Patterns

Jdbc callback interfaces

Spring provides three callback interfaces for JDBC as follows:

• Implementing RowMapper: Spring provides a RowMapper interface for mapping a single row of a ResultSet to an object. It can be used for both single and multiple row queries. It is parameterized as of Spring 3.0:

      public interface RowMapper<T> { 
        T mapRow(ResultSet rs, int rowNum) 
        throws SQLException; 
      } 

• Let's understand this with the help of an example.