Use jdbcTemplate implement a pagination in spring

DemoRepository

package com.domain;

import com.domain.Module;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public class DemoRepository {
    private JdbcTemplate jdbcTemplate;

    @Autowired
    public DemoRepository(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public List<Demo> findDemo() {
        String querySql = "SELECT name, action, operator, operated_at " +
                "FROM auditing " +
                "WHERE module = ?";
        return jdbcTemplate.query(querySql, new Object[]{Module.ADMIN_OPERATOR.getModule()}, (rs, rowNum) ->
                Demo.builder()
                        .rowNum(rowNum)
                        .operatedAt(rs.getTimestamp("operated_at").toLocalDateTime())
                        .operator(rs.getString("operator"))
                        .action(rs.getString("action"))
                        .name(rs.getString("name"))
                        .build()
        );
    }

    public Page<Demo> findDemoByPage(Pageable pageable) {
        String rowCountSql = "SELECT count(1) AS row_count " +
                "FROM auditing " +
                "WHERE module = ? ";
        int total =
                jdbcTemplate.queryForObject(
                        rowCountSql,
                        new Object[]{Module.ADMIN_OPERATOR.getModule()}, (rs, rowNum) -> rs.getInt(1)
                );

        String querySql = "SELECT name, action, operator, operated_at " +
                "FROM auditing " +
                "WHERE module = ? " +
                "LIMIT " + pageable.getPageSize() + " " +
                "OFFSET " + pageable.getOffset();
        List<Demo> demos = jdbcTemplate.query(
                querySql,
                new Object[]{Module.ADMIN_OPERATOR.getModule()}, (rs, rowNum) -> Demo.builder()
                        .rowNum(rowNum)
                        .operatedAt(rs.getTimestamp("operated_at").toLocalDateTime())
                        .operator(rs.getString("operator"))
                        .action(rs.getString("action"))
                        .name(rs.getString("name"))
                        .build()
        );

        return new PageImpl<>(demos, pageable, total);
    }
}

DemoRepositoryTest

@Test
public void should_return_demo_page() {
    int count = 5;
    int page = 1;
    int size = 3;
    int totalPages = (int) Math.ceil((double) count / size);
    int contentSize = page + 1 < totalPages ? size : count - size * page;
    save(count);

    Pageable pageable = new PageRequest(page, size);
    Page<Demo> dataPage = repository.findDemoByPage(pageable);

    assertThat((int) dataPage.getTotalElements(), equalTo(count));
    assertThat(dataPage.getTotalPages(), equalTo(totalPages));
    assertThat(dataPage.getContent().size(), equalTo(contentSize));

}