java打印一個數據庫的所有表的主鍵

public class MysqlTest {

    private static final  Logger logger= LoggerFactory.getLogger(MysqlTest.class);
    public void  getTabs() throws  Exception{

        //所有表
        String sql="show TABLES";
        List<String> list= DbTools.getList(sql);
        if(list!=null&&!list.isEmpty()){

            for(String t: list){
                String sql2=" SELECT k.column_name" +
                        " FROM information_schema.table_constraints t " +
                        " JOIN information_schema.key_column_usage k " +
                        " USING (constraint_name,table_schema,table_name) " +
                        " WHERE t.constraint_type='PRIMARY KEY' " +
                        " AND t.table_schema='dbname' " +//數據庫名
                        " AND t.table_name=? ";           //表名
                String result=DbTools.getStringValue(sql2,DbTools.makeParams(t));
                System.out.println("table name："+t+"\t"+",主鍵ID:"+result);
            }
        }
    }
    public  static  void  main(String[] args) throws  Exception{
        new  MysqlTest().getTabs();
    }

}