Getting last elements in list while uing json array - json

Question

while passing list to json object i am not able to read all the elemnts.. it shows only the list which i stored very last
List<String> list = new ArrayList<String>();
for (int i=0 ; i<columnCount ; i++)
{
while (rs.next())
{
list.add(rs.getString(rsMetaData.getColumnName(i+1)));
}
json.put(rsMetaData.getColumnName(i+1), list);
//json.accumulate(rsMetaData.getColumnName(i+1), list);
}

Answer 1

ResultSet is a iterator who is iterated only once, for the first column.
The List-Object is only created once and strored multiple to json. Even if you store the list for the first column, you change this first-column value in the second column.
Try this:
while (rs.next()) {
for (int i=0; i < columnCount; i++) {
String columnName = rsMetaData.getColumnName(i+1);
List<String> list = new ArrayList<String>();
if (json.get(columnName) == null) {
json.put(columnName, list);
} else {
list = (List<String>)json.get(columnName);
}
list.add(rs.getString(columnName));
}
}
BTW: Duplicate columnNames are not supported by json

Answer 2

Finally i got the answer ...this is my code
try
{ HashMap map= new HashMap();
List list = new ArrayList();
int col = 0;
while (rs.next())
{
values = new JSONObject();
for (int i=0 ; i<columnCount ; i++)
{
values.put(rsMetaData.getColumnName(i+1),rs.getString(rsMetaData.getColumnName(i+1)));
}
list.add(col, values.toString());
System.out.println(list.toString());
col++;
}
json.put("gaea", list);
}//try block end