编写Excel文件jdbctemplate

Question

This may seem a trivial question but I am using jdbctemplate and need to export data to an excel file. Not sure if I can use the CSVWriter since jdbctemplate does not have a method to return a resultset and I need the headers. I do not want to hardcode the headers in the code either as they will change. I just want to dump the data as is from the db (along with headers).

Answer 1

To access the metadata of a ResultSet you can use RowMapper , RowCallbackHandler or ResultSetExtractor . To write a file for Excel you can use Apache POI . Example:

Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("sheetname");
jdbcTemplate.query("select * from xyz", new RowCallbackHandler() {
    public void processRow(ResultSet rs) throws SQLException {
        String columnName = rs.getMetaData().getColumnName(column);
        String columnValue = rs.getString(column);

        Row row = sheet.createRow(sheetRow);
        row.createCell(column).setCellValue(columnValue);
    }
});

try (FileOutputStream out = new FileOutputStream(new File("export.xlsx"))) {
    workbook.write(out);
}

Check also the implementing classes of these interfaces.