如何从JDBC查询中正确获取列数

Question

I have this code that converts a JDBC result set into a list of hash tables:

private static ArrayList<HashMap<String, Object>> convertResultSet(ResultSet resultSet) throws SQLException {
    ArrayList<HashMap<String, Object>> map = new ArrayList<HashMap<String, Object>>();
    ResultSetMetaData rsmd = resultSet.getMetaData();
    int nColumns = rsmd.getColumnCount();
    while(resultSet.next()) {
        HashMap<String, Object> hash = new HashMap<String, Object>();
        for (int i = 0; i < nColumns; i++)
        {
            hash.put(rsmd.getColumnName(i), resultSet.getObject(i));
        }
        map.add(hash);
    }
    return map;
}

but when run, it throws a "Column index out of range." exception.

Any ideas?

Answer 1

如javadoc中所述，getColumnName（i）的索引从1开始，而不是0。