How to manage a large dataset using Spring MySQL and RowCallbackHandler

Question

I\'m trying to go over each row of a table in MySQL using Spring and a JdbcTemplate. If I\'m not mistaken this should be as simple as:

JdbcTemplate template         


        

Answer 1

Here's a Spring solution based on the answer provided by BalusC.

class StreamingStatementCreator implements PreparedStatementCreator {
    private final String sql;

    public StreamingStatementCreator(String sql) {
        this.sql = sql;
    }

    @Override
    public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
        final PreparedStatement statement = connection.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
        statement.setFetchSize(Integer.MIN_VALUE);
        return statement;
    }
}

Somewhere in your code:

DataSource dataSource = ...;
RowCallbackHandler rowHandler = ...;
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.query(new StreamingStatementCreator("SELECT * FROM huge_table"), rowHandler);