IncorrectResultSetColumnCountException: Incorrect column count: expected 1, actual 38

Question

I am using JdbcTemplate to retrieve a Bean from the db. Here is my method:

public List  getTrackerData() {
    return List         


        

Answer 1

Should try using Rowmapper like use it as when you query API.

Hope that solves your problem.

Answer 2

JdbcTemplate method

queryForList(String sql, Class<T> elementType)

is useful for one-column-queries, you may only specify the column type. If you need more than one column in ResultSet, it's more accurate to use

query(String sql, RowMapper<T> rowMapper)

as implementation for RowMapper you may use your own, or

jdbcTemplate.query(sql, new BeanPropertyRowMapper<T>(clazz));

so in your case it may be:

public List<Trackerv3Livedata> getTrackerData() {
    String sql = "SELECT * FROM mmitrackerv3_livedata mlive " +
                 "JOIN mmitrackerv3_device mdevice ON mlive.accountid = " +
                 "mdevice.accountid WHERE mlive.accountid = " + aid;

    return jdbcTemplate.query(sql,
        new BeanPropertyRowMapper<Trackerv3Livedata>(Trackerv3Livedata.class));
}

Answer 3

Implementing Bean RowMapper Interface and maprow function solve this problem

public class Mmitrackerv3LivedataMapper implements RowMapper<Mmitrackerv3Livedata> {

@Override
public Mmitrackerv3Livedata mapRow(ResultSet rs, int rowNum)
        throws SQLException {
}

And Now I have Change In JDBC Template

 List<Mmitrackerv3Livedata> live = jdbcTemplate.query("select * from mmitrackerv3_livedata mlive " + 
 "join mmitrackerv3_device mdevice on mlive.accountid = mdevice.accountid where mlive.accountid = " +
     aid, new Mmitrackerv3LivedataMapper());

Thanks @abhishek

Answer 4

This is happening because, the queryForList method you have used will not support for multiple columns. See the implementation of queryForList from JdbcTemplate

public <T> List<T> More ...queryForList(String sql, Object[] args, Class<T> elementType) throws DataAccessException 
{
    return query(sql, args, getSingleColumnRowMapper(elementType));
}

The getsingleColumnRowMapper() method creates a new RowMapper for reading result objects from a single column. You can use the method given below instead.

public <T> List<T> query(String sql, Object[] args, RowMapper<T> rowMapper) throws DataAccessException        
 {
    return query(sql, args, new RowMapperResultSetExtractor<T>(rowMapper));
}