光標未打開錯誤

我想要處理表「accounts」的所有列名稱。我發現這個存儲過程堆棧溢出，但它不按預期工作。光標未打開錯誤

delimiter $ 

create procedure prc_column() 
BEGIN 
DECLARE num_rows int; 
declare i int; 
declare col_name varchar(1000); 

DECLARE col_names CURSOR FOR 
    SELECT column_name 
    FROM INFORMATION_SCHEMA.COLUMNS 
    WHERE table_name = 'accounts' 
    ORDER BY ordinal_position; 


select FOUND_ROWS() into num_rows; 

SET i = 1; 
the_loop: LOOP 

    IF i > num_rows THEN 
     CLOSE col_names; 
     LEAVE the_loop; 
    END IF; 


    FETCH col_names 
    INTO col_name;  

// do something with column names for e.g. append it with _drupal 

    SET i = i + 1; 
END LOOP the_loop; 

END

我得到一個錯誤：

ERROR 1326（24000）：遊標未打開

來源

2011-02-10 shantanuo

之前聲明打開的遊標是否有可能將表名稱提供給像prc_column（帳戶）這樣的過程？ – shantanuo 2011-02-10 11:14:06

你似乎忘了循環

open col_names; 
the_loop: LOOP 
...

來源

2011-02-10 10:33:46 ajreal

光標未打開錯誤

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