hibernate sql 语句 查询所有 字段名

Posted 2022-06-20 痛而不觉

/*Statement statement = null;
        Connection disconnect = null;
        ResultSet resultSet = null;
        try 
            disconnect = getSession().disconnect();
            statement = disconnect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
            resultSet = statement.executeQuery(sql);
            ResultSetMetaData metaData = resultSet.getMetaData();
            for (int i = 0; i < metaData.getColumnCount(); i++) 
                System.out.println("获取到的数据ziduan字段名:" + metaData.getColumnName(i));
            
         catch (SQLException e) 
            e.printStackTrace();
         finally 
            if (statement != null) 
                try 
                    if (resultSet != null) 
                        resultSet.close();
                    
                    statement.close();
                    disconnect.close();
                 catch (SQLException e) 
                    e.printStackTrace();
                
            
        */
//        String[] namedParameters = getSession().createSQLQuery(sql).getNamedParameters();
//        System.out.println("namedParameters = " + Arrays.toString(namedParameters));

以上代码应该可行,但是我用的时候包异常,好像是连接的问题,有知道原因的大神请指点一下.

 

String sql = "SELECT * FROM " + tableName;/* + " WHERE Recid=" + queryParameters*/
        List<Map<String, Object>> list = getSession().createSQLQuery(sql).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP).list();
        System.out.println("获取到的数据list:" +list);

这三行代码可以输出list集合,key是字段名称,value是值   <正好是我想要的>

/*String sql = "SELECT * FROM " + tableName;
        List list = getSession().createSQLQuery(sql).list();
        for (int i = 0; i < list.size(); i++) 
            //这里要用Object[]接收查出来的list中每一条数据
            Object[] obj = (Object[]) list.get(i);
            System.out.println("获取到的数据:13" + Arrays.toString(obj));
        */

如果只是查询数据的话,以上几行代码即可.