Mysql存储过程：无法重新打开表：“临时表”。 如何解决这个问题

Question

I've successful execute this procedure when I call the stored procedure, I get error message:

Can't reopen table: 'temp1'.

Its like temporary table used more than once in the query. Any ideas or other solution to solve this problem ?

DELIMITER //
CREATE PROCEDURE menu_t1()
BEGIN
CREATE TEMPORARY TABLE if not exists temp1(
    object_id VARCHAR(50) NULL, 
    description VARCHAR(100) NULL,
    display_name VARCHAR(60) NULL,
    menu_id VARCHAR(40) NULL,
    order_seq int NULL,
    menu_level int NULL,
    link_url VARCHAR(200) NULL,
    OrderString VARCHAR(200) NULL
    );

    insert into temp1 (object_id, description, display_name, menu_id, order_seq, menu_level, link_url, OrderString)
    SELECT mp.object_id, mp.description, mp.display_name, mp.menu_id, mp.order_seq, mp.menu_level, mp.link_url,
    concat('00',cast((mp.order_seq) as char)) OrderString 
    FROM ui_menuitem mp 
    WHERE mp.parent_id is null and mp.menu_id = '1';

    select * from temp1;

   select * from temp1
   union all
   select mc.object_id, mc.description, mc.display_name, mc.menu_id, mc.order_seq, mc.menu_level, mc.link_url, 
    concat(temp1.OrderString,'-',cast((mc.order_seq) as char)) OrderString
    from ui_menuitem mc, temp1
    where mc.parent_id = temp1.object_id and mc.menu_id = '1';

    TRUNCATE TABLE temp1;
   DROP TEMPORARY TABLE IF EXISTS temp1;

COMMIT;
END //
DELIMITER ;

This style looks like recursive.

Thanks

Answer 1

While you have declared the temporary table, you've not defined anything about it, such as columns, types, nor inserted any data into it. All you've done is declare it, and then perform a select statement.

You need to instead define your table by doing something like this

CREATE TABLE #temp1(
    object_id INT, 
    description VARCHAR(200)
    ...)

And then insert the data into it like this

INSERT INTO #temp1(object_id, description, ...)
SELECT mp.object_id, mp.description, ...

You are getting the error at present as temp1 currently has no OrderString column.