MySQL#1243提供给EXECUTE的未知预准备语句处理程序(stmt) [英] MySQL #1243 Unknown prepared statement handler (stmt) given to EXECUTE
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问题描述
我正在我的教程上已安装的MySQL版本,但抛出一个错误:
I am following this tutorial on my installed version of MySQL, but it's throwing me an error:
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'MAX(IF(property_name = ''',
property_name,
''', value, NULL)) AS ',
property_name
)
) INTO @sql
FROM
properties;
SET @sql = CONCAT('SELECT item_id, ', @sql, ' FROM properties GROUP BY item_id');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
我将其粘贴在phpMyAdmin的SQL编辑器中.
I am pasting it on SQL editor in phpMyAdmin.
我遵循了这个建议.没有显示错误,但结果如下:
I followed the suggestion. No errors shown but here's the result:
SELECT item_id
,MAX(IF(property_name = 'color', value, NULL)) AS color
,MAX(IF(property_name = 'size', value, NULL)) AS size
,MAX(IF(property_name = 'weight', value, NULL)) AS weight
FROM properties GROUP BY item_id
推荐答案
如果您可以访问MySQL命令行,我认为您会发现SQL代码很好(只要@sql
不等于NULL
),问题出在phpMyAdmin.另一个想法是将代码包装到存储过程中,然后CALL
该过程.
If you have access to a MySQL command-line, I think you'll find your SQL code is fine (as long as @sql
doesn't equal NULL
) and the issue is with phpMyAdmin. Another idea is to wrap the code in a stored procedure and then CALL
the procedure.
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