How to convert a Java resultset into JSON?

Question

I have a resultset as a result of a MySQL query using the JDBC connector. So my job is to convert the resultset into a JSON format. So that I can send it to the clientside a

Answer 1

You can use any JSON library.

The following is an implementation of this, return a list, with each element a JSON Object:

/*
 * Convert ResultSet to a common JSON Object array
 * Result is like: [{"ID":"1","NAME":"Tom","AGE":"24"}, {"ID":"2","NAME":"Bob","AGE":"26"}, ...]
 */
public static List getFormattedResult(ResultSet rs) {
    List resList = new ArrayList();
    try {
        // get column names
        ResultSetMetaData rsMeta = rs.getMetaData();
        int columnCnt = rsMeta.getColumnCount();
        List columnNames = new ArrayList();
        for(int i=1;i<=columnCnt;i++) {
            columnNames.add(rsMeta.getColumnName(i).toUpperCase());
        }

        while(rs.next()) { // convert each object to an human readable JSON object
            JSONObject obj = new JSONObject();
            for(int i=1;i<=columnCnt;i++) {
                String key = columnNames.get(i - 1);
                String value = rs.getString(i);
                obj.put(key, value);
            }
            resList.add(obj);
        }
    } catch(Exception e) {
        e.printStackTrace();
    } finally {
        try {
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    return resList;
}