Php 带有嵌套select语句的MySQL触发器

我在magento数据库中的触发器语法方面遇到了一些困难

我想在创建新地址时更新customer表中的值

customer\u address\u entity\u varchar表如下所示：

value_id | entity_type_id | attribute_id | entity_id | value
48       | 2              | 28           | 3         | Lancashire

当我在没有嵌套select语句的情况下执行触发器时，它会工作，因此：

IF (new.attribute_id=28) THEN
UPDATE customer_entity SET customer_entity.group_id = 4
WHERE customer_entity.entity_id = 1
END IF;

我尝试使用new.entity_id和new.value从其他表中选择值来替换4和1：

DROP TRIGGER IF EXISTS `groupid_update`;
CREATE DEFINER=`rock_store`@`localhost` TRIGGER `groupid_update` 
AFTER INSERT ON `customer_address_entity_varchar` 

FOR EACH ROW 

IF (new.attribute_id = 28) THEN 

UPDATE customer_entity 
SET customer_entity.group_id = ( 
    SELECT directory_country_region_name.customer_group_id 
    FROM directory_country_region_name 
    WHERE directory_country_region_name.name = "'" + new.value + "'") 
WHERE customer_entity.entity_id = ( 
    SELECT customer_address_entity.parent_id 
    FROM customer_address_entity 
    WHERE customer_address_entity.entity_id = new.entity_id); 
END IF;

在MySQL中创建触发器是成功的，但是当我尝试在Magento中添加一个新地址时，我得到了一个错误，它没有告诉我什么

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谢谢你的帮助。利亚姆

我设法解决了这个问题，打破了我试图做的事情

IF (new.attribute_id = 28) THEN 

SET @add_entity_id = new.entity_id;
SET @county = new.value;


SET @group_id = (SELECT directory_country_region_name.customer_group_id 
FROM directory_country_region_name 
WHERE directory_country_region_name.name = @county);

SET @customer_id = ( 
SELECT customer_address_entity.parent_id 
FROM customer_address_entity 
WHERE customer_address_entity.entity_id = new.entity_id);

UPDATE customer_entity SET customer_entity.group_id = @group_id WHERE customer_entity.entity_id = @customer_id;

END IF