我有一个具有 FOREIGN KEY 约束的本地数据库。
该网站数据库的实时版本没有任何这些外键约束。
如何“复制/粘贴”,仅将外键约束从一个数据库导入/导出到另一个数据库?
我不想复制任何数据,只复制约束。
谢谢
我有一个具有 FOREIGN KEY 约束的本地数据库。
该网站数据库的实时版本没有任何这些外键约束。
如何“复制/粘贴”,仅将外键约束从一个数据库导入/导出到另一个数据库?
我不想复制任何数据,只复制约束。
谢谢
您可以使用我在http://www.siusic.com/wphchen/how-to-script-out-all-the-foreign-keys-of-a-table-106.html找到的这个脚本。将 tablename1 和 tablename2 替换为您希望为其获取外键的表列表。
select 'ALTER TABLE '+object_name(a.parent_object_id)+
' ADD CONSTRAINT '+ a.name +
' FOREIGN KEY (' + c.name + ') REFERENCES ' +
object_name(b.referenced_object_id) +
' (' + d.name + ')'
from sys.foreign_keys a
join sys.foreign_key_columns b
on a.object_id=b.constraint_object_id
join sys.columns c
on b.parent_column_id = c.column_id
and a.parent_object_id=c.object_id
join sys.columns d
on b.referenced_column_id = d.column_id
and a.referenced_object_id = d.object_id
where object_name(b.referenced_object_id) in
('tablename1','tablename2')
order by c.name
我需要做类似的事情,我需要在多个服务器上使用相同的外键,除了已经添加了一些外键。所以我在创建语句的开头添加了一个“IF NOT EXISTS”检查:
SELECT N'
IF NOT EXISTS (SELECT * FROM sys.foreign_keys
WHERE object_id = OBJECT_ID(''' + QUOTENAME(fk.name) + ''')
AND parent_object_id = OBJECT_ID(''' + QUOTENAME(cs.name) + '.' + QUOTENAME(ct.name) +''')
)
BEGIN
ALTER TABLE '
+ QUOTENAME(cs.name) + '.' + QUOTENAME(ct.name)
+ ' ADD CONSTRAINT ' + QUOTENAME(fk.name)
+ ' FOREIGN KEY (' + STUFF((SELECT ',' + QUOTENAME(c.name)
-- get all the columns in the constraint table
FROM sys.columns AS c
INNER JOIN sys.foreign_key_columns AS fkc
ON fkc.parent_column_id = c.column_id
AND fkc.parent_object_id = c.[object_id]
WHERE fkc.constraint_object_id = fk.[object_id]
ORDER BY fkc.constraint_column_id
FOR XML PATH(N''), TYPE).value(N'.[1]', N'nvarchar(max)'), 1, 1, N'')
+ ') REFERENCES ' + QUOTENAME(rs.name) + '.' + QUOTENAME(rt.name)
+ '(' + STUFF((SELECT ',' + QUOTENAME(c.name)
-- get all the referenced columns
FROM sys.columns AS c
INNER JOIN sys.foreign_key_columns AS fkc
ON fkc.referenced_column_id = c.column_id
AND fkc.referenced_object_id = c.[object_id]
WHERE fkc.constraint_object_id = fk.[object_id]
ORDER BY fkc.constraint_column_id
FOR XML PATH(N''), TYPE).value(N'.[1]', N'nvarchar(max)'), 1, 1, N'') + ')
END'
FROM sys.foreign_keys AS fk
INNER JOIN sys.tables AS rt -- referenced table
ON fk.referenced_object_id = rt.[object_id]
INNER JOIN sys.schemas AS rs
ON rt.[schema_id] = rs.[schema_id]
INNER JOIN sys.tables AS ct -- constraint table
ON fk.parent_object_id = ct.[object_id]
INNER JOIN sys.schemas AS cs
ON ct.[schema_id] = cs.[schema_id]
WHERE rt.is_ms_shipped = 0 AND ct.is_ms_shipped = 0;
如果您不想要“IF NOT EXISTS”检查(它们真的不重要),只需删除前 5 行并在“BEGIN”之前添加“SELECT N”,如下所示:
SELECT N'BEGIN
ALTER TABLE '
+ QUOTENAME(cs.name) + '.' + QUOTENAME(ct.name)
——我在网上某处找到了这个查询的核心,我已经修改了一段时间。感谢他们将大部分内容放在一起......