Spring JdbcTemplate

PreparedStatement
RowMapper
ResultSetExtractor
NamedParameter
BeanPropertyRowMapper

ResultSetExtractor: 

• org.springframework.jdbc.core.ResultSetExtractor is a callback interface.
• This is used to extracting results from a ResultSet. 
• ResultSetExtractor is used if we required.one result object for the entire ResultSet.

RowMapper: 

• org.springframework.jdbc.core.RowMapper<T> is a interface.
• This is used by JdbcTemplate to map each row of a ResultSet to a result object "per-row basis".
• A RowMapper is use to process ResultSet, mapping one result object per row.

new Object[] { empId }: passing the id as a parameter to the query
new BeanPropertyRowMapper<Employee>(Employee.class): BeanPropertyRowMapper is use to map the results from ResultSet to the Employee bean.


Related Tutorial

• Spring Boot JdbcTemplate Configuration
• Spring Boot JdbcTemplate Multiple Datasource Configuration
• Spring Boot JdbcTemplate Example