相关疑难解决方法(0)

我有一个如下所示的storerd程序,

CREATE FUNCTION select_transactions3(text, text, int)    
RETURNS SETOF transactions AS   
$body$   
DECLARE    
    rec transactions%ROWTYPE;  
BEGIN
    FOR rec IN (SELECT invoice_no, trans_date FROM transactions WHERE $1 = $2 limit $3  )    
    LOOP     
        RETURN NEXT rec;    
    END LOOP;  
END;   
$body$  
LANGUAGE plpgsql VOLATILE SECURITY DEFINER;

当我执行这样的查询时:

select * from select_transactions3("invoice_no", '1103300105472',10);

要么

select * from select_transactions3(invoice_no, '1103300105472',10);

它得到这样的错误: 错误:列"invoice_no"不存在

但是当我尝试用这样的一个冒号执行时:

select * from select_transactions3('invoice_no', '1103300105472',10);

结果是没有行.

我怎么能得到这样的数据:

  invoice_no   |       trans_date        
---------------+-------------------------
 1103300105472 | 2011-03-30 12:25:35.694

谢谢 .

更新:如果我们想要显示我们想要显示的某一列表

CREATE FUNCTION select_to_transactions14(_col character …