//問い合わせの準備
Statement st = cn.createStatement();
String qry = "SELECT * FROM md_bni";

//問い合わせ
ResultSet rs = st.executeQuery(qry);

//データの取得
ResultSetMetaData rm = rs.getMetaData();
int cnum = rm.getColumnCount();

while (rs.next())
{
for (int i = 1; i <= cnum; i++)
{
System.out.print(rm.getColumnName(i) + ":" + rs.getObject(i) + " ");
}
System.out.println("");
}

//接続のクローズ
rs.close();
st.close();
cn.close();
}
catch (Exception e)
{
e.printStackTrace();
}