What is mapRow?

mapRow. @Nullable T mapRow(ResultSet rs, int rowNum) throws SQLException. Implementations must implement this method to map each row of data in the ResultSet. This method should not call next() on the ResultSet; it is only supposed to map values of the current row.

Why do we use row Mapper?

RowMapper interface allows to map a row of the relations with the instance of user-defined class. It iterates the ResultSet internally and adds it into the collection. So we don’t need to write a lot of code to fetch the records as ResultSetExtractor.

How do you use a results set extractor?

ResultSetExtractor interface is a callback interface used by JdbcTemplate’s query methods. Implementations of this interface perform the actual work of extracting results from a ResultSet, but don’t need to worry about exception handling. SQLExceptions will be caught and handled by the calling JdbcTemplate.

What is the use of JdbcTemplate in spring?

The Spring JDBC template allows to clean-up the resources automatically, e.g. release the database connections. The Spring JDBC template converts the standard JDBC SQLExceptions into RuntimeExceptions. This allows the programmer to react more flexible to the errors.

Does JdbcTemplate use prepared statements?

The JdbcTemplate will create the PreparedStatement and with the callback only being responsible for setting parameter values. This interface contains one method namely, setValues(PreparedStatement ps): It sets parameter values on the given PreparedStatement.

How do you implement a RowMapper in spring?

Usage

  1. Step 1 − Create a JdbcTemplate object using a configured datasource.
  2. Step 2 − Create a StudentMapper object implementing RowMapper interface.
  3. Step 3 − Use JdbcTemplate object methods to make database operations while using StudentMapper object.

What is MapSqlParameterSource in Java?

public class MapSqlParameterSource extends AbstractSqlParameterSource. SqlParameterSource implementation that holds a given Map of parameters. This class is intended for passing in a simple Map of parameter values to the methods of the NamedParameterJdbcTemplate class.