Postgresql 获取将被级联截断的表的列表
有没有一种方法可以获得在postgres中也会被Postgresql 获取将被级联截断的表的列表,postgresql,cascade,Postgresql,Cascade,有没有一种方法可以获得在postgres中也会被TRUNCATE CASCADE截断的表列表 例如,假设我们有三个表: a b (depends on a) c (depends on b) 截断级联还将截断b和c。我们怎么能提前检查呢 在answer的帮助下,您可以通过此查询获取外部表名 SELECT tc.constraint_name ,tc.table_name ,kcu.column_name ,ccu.table_name AS foreign_
TRUNCATE CASCADE
截断的表列表
例如,假设我们有三个表:
a
b (depends on a)
c (depends on b)
截断级联
还将截断b
和c
。我们怎么能提前检查呢 在answer的帮助下,您可以通过此查询获取外部表名
SELECT tc.constraint_name
,tc.table_name
,kcu.column_name
,ccu.table_name AS foreign_table_name
,ccu.column_name AS foreign_column_name
FROM
information_schema.table_constraints AS tc
JOIN information_schema.key_column_usage AS kcu
ON tc.constraint_name = kcu.constraint_name
JOIN information_schema.constraint_column_usage AS ccu
ON ccu.constraint_name = tc.constraint_name
WHERE constraint_type = 'FOREIGN KEY' AND ccu.table_name = 'a'
或 使用另一个查询创建视图
CREATE VIEW vdepend_table
AS
SELECT s1.constraint_name
,s1.table_name
,s1.column_name
,s1.ordinal_position
,s2.table_name_ref
,s2.column_name_ref
,s2.ordinal_position_ref
FROM (
SELECT key_column_usage.constraint_name
,key_column_usage.table_name
,key_column_usage.column_name
,columns.ordinal_position
FROM information_schema.key_column_usage
JOIN information_schema.columns USING (
table_name
,column_name
)
) s1
JOIN (
SELECT constraint_column_usage.constraint_name
,constraint_column_usage.table_name AS table_name_ref
,constraint_column_usage.column_name AS column_name_ref
,cols_ref.ordinal_position AS ordinal_position_ref
FROM information_schema.constraint_column_usage
JOIN information_schema.columns cols_ref ON cols_ref.table_name::TEXT = constraint_column_usage.table_name::TEXT
AND cols_ref.column_name::TEXT = constraint_column_usage.column_name::TEXT
) s2 ON s1.constraint_name::TEXT = s2.constraint_name::TEXT
AND NOT s1.table_name::TEXT = s2.table_name_ref::TEXT;
用法:
select table_name from vdepend_table where table_name_ref='a'
试试看,你的工作很有魅力!我只想为那些搜索添加,您可以添加
和ccu.table_name='a'
,以满足这个问题。是的,您当然可以。