queryFromPool("sql語法")：執行查詢的SQL語法，並將值傳回二維陣列
talk t = getTalk("nwcs");
String sql = "SELECT 員工編號,姓名,職稱FROM 員工";
String ret[][] = t.queryFromPool(sql);
if(ret.length > 0){
for( int i = 0 ; i < ret.length ; i++){
for(int j = 0 ; j < ret[i].length ; j ++){
System.out.print(ret[i][j]+" ");
}
System.out.println("");
}
}