Sql server - 动态更改所有外键约束Update_Rule

Posted 2021-04-14

我试图通过在数据库中设置为UPDATE_RULE的'NO ACTION'来检查所有外键约束，并将该规则更改为'CASCADE'。所以，我知道我应该首先删除该约束并重新添加它。

为了做到这一点，我尝试了以下查询来获取所有相关的约束，然后迭代每一行并构建一个动态的sql查询，它将删除约束，并将使用不同的UPDATE_RULE值重新添加它。

但是，为了添加约束，我需要定义主键的表名，我在查询中没有它。我只有外键所在的表名：

SELECT *
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS AS RC
INNER JOIN INFORMATION_SCHEMA.table_constraints AS CU
  ON CU.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
  AND CU.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
WHERE UPDATE_RULE = 'NO ACTION'

有关如何做的任何建议？我只需要更改约束UPDATE_RULE值。

答案

答案在这里找到：https://dba.stackexchange.com/questions/31720/find-the-foreign-keys-associated-with-a-given-primary-key

SELECT
o1.name AS FK_table,
c1.name AS FK_column,
fk.name AS FK_name,
o2.name AS PK_table,
c2.name AS PK_column,
pk.name AS PK_name,
fk.delete_referential_action_desc AS Delete_Action,
fk.update_referential_action_desc AS Update_Action
FROM sys.objects o1
INNER JOIN sys.foreign_keys fk
    ON o1.object_id = fk.parent_object_id
INNER JOIN sys.foreign_key_columns fkc
    ON fk.object_id = fkc.constraint_object_id
INNER JOIN sys.columns c1
    ON fkc.parent_object_id = c1.object_id
    AND fkc.parent_column_id = c1.column_id
INNER JOIN sys.columns c2
    ON fkc.referenced_object_id = c2.object_id
    AND fkc.referenced_column_id = c2.column_id
INNER JOIN sys.objects o2
    ON fk.referenced_object_id = o2.object_id
INNER JOIN sys.key_constraints pk
    ON fk.referenced_object_id = pk.parent_object_id
    AND fk.key_index_id = pk.unique_index_id
ORDER BY o1.name, o2.name, fkc.constraint_column_id