创建SQL Server数据库的开发版本的最佳方法是什么？

Question

我刚刚从其他人那里继承了一个项目，我想知道是否有一种简单的方法来识别数据库中的所有关系依赖项，以便您可以轻松地从生产中删除大量数据以创建开发人员副本，但保留其余帐户的关系完好无损。

Answer 1

This will give you the "template SQL" in the correct order.

But you'll have to fill in some missing where clause stuff (not trivial).

;
with    cteTableHierarchy 
          as ( /* Select all table without (selfreferencing) FK */
               select distinct
                        1 as LevelID
                      , OBJECT_SCHEMA_NAME(Parent.object_id) as TableOwner
                      , Parent.name as TableName
                      , Parent.object_id as TbObjID

               from     sys.objects Parent
               left join sys.foreign_key_columns RefKey
                        On RefKey.parent_object_id = Parent.object_id
                           and RefKey.parent_object_id <> RefKey.referenced_object_id
                           and RefKey.constraint_column_id = 1
               where    RefKey.parent_object_id is null
                        and Parent.type = 'U'
                        and Parent.name <> 'dtproperties'
               UNION ALL
               /* add tables that reference the anchor rows */
               SELECT   H.LevelID + 1
                      , OBJECT_SCHEMA_NAME(Parent.object_id) as TableOwner
                      , OBJECT_NAME(Parent.object_id) as TableName
                      , Parent.object_id as TbObjID
               from     sys.objects Parent
               inner join sys.foreign_key_columns RefKey
                        On RefKey.parent_object_id = Parent.object_id
                           and RefKey.parent_object_id <> RefKey.referenced_object_id
                           and RefKey.constraint_column_id = 1
               inner join cteTableHierarchy H
                        on H.TbObjID = RefKey.referenced_object_id 
               where    Parent.type = 'U'
                        and Parent.name <> 'dtproperties'
             )
    select distinct *    , TemplateSQL = 'Delete from [' + TableOwner + '].[' + TableName + '] Where .... '
    from    cteTableHierarchy
    order by LevelID desc -- descending order = order of row deletes
          , TableOwner
          , TableName ;

EDIT ........................

Comment out the "Select *" and uncomment the "Delete deleteAlias" to actually perform the deletes. The good thing about this little syntax sugar (Select * vs "Delete deleteAlias" is you can quickly see the EXACT data (via the select *) that you are going to actually delete "Delete deleteAlias".

The below populates a small @Holder variable table. Then will reverse walk the 3 tables.......to delete the data.

Note, the last table (from dbo.[Customers] deleteAlias) has some redundant/unnecessary code, but I'm trying to show the concept over "conciseness".

Use Northwind
Go




/* Example to Delete all Order-Details, Orders, Customers based on a known list of CustomerID's */

declare @CustomerIDHolder table ( CustomerID char(5) )
INSERT INTO @CustomerIDHolder ( CustomerID )
Select 'ALFKI' union all select '33333'


--Delete deleteAlias 
  Select * 
from dbo.[Order Details] deleteAlias
where exists 
    ( select null from dbo.[Orders] innerOrds join dbo.Customers innerCusts on innerOrds.CustomerID = innerCusts.CustomerID 
        where
        /* exists inner to outer relationshiop */
        innerOrds.OrderId = deleteAlias.OrderId
        and
        /* filter */
        exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )


--Delete deleteAlias 
  Select * 
from dbo.[Orders] deleteAlias
where exists 
    ( select null from dbo.Customers innerCusts
        where
        /* exists inner to outer relationshiop */
        innerCusts.CustomerID = deleteAlias.CustomerID
        and
        /* filter */
        exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )


--Delete deleteAlias 
  Select * 
from dbo.[Customers] deleteAlias
where exists 
    ( select null from dbo.Customers innerCusts
        where
        /* exists inner to outer relationshiop */
        innerCusts.CustomerID = deleteAlias.CustomerID
        and
        /* filter */
        exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )

And here is a "Mark things I want to keep, but delete the rest" example........

/* Example to Delete all Order-Details, Orders, Customers based on a known list of CustomerID's */

declare @CustomerIDHolder table ( CustomerID char(5) )
INSERT INTO @CustomerIDHolder ( CustomerID )
Select CustomerID from dbo.Customers

/* Keep all the data except for 2 Customers.  Aka, The Customers who do NOT exist in the holder table will be deleted.... */
Delete deleteAliasHolder From @CustomerIDHolder deleteAliasHolder where exists ( Select CustID from (Select 'ALFKI' as CustID union all select '33333' as CustID ) as derived1 where derived1.CustID = deleteAliasHolder.CustomerID )

Select CustomerID as DataToKeepCustomerID from @CustomerIDHolder 

--Delete deleteAlias 
  Select * 
from dbo.[Order Details] deleteAlias
where exists 
    ( select null from dbo.[Orders] innerOrds join dbo.Customers innerCusts on innerOrds.CustomerID = innerCusts.CustomerID 
        where
        /* exists inner to outer relationshiop */
        innerOrds.OrderId = deleteAlias.OrderId
        and
        /* filter */
        not exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )


--Delete deleteAlias 
  Select * 
from dbo.[Orders] deleteAlias
where exists 
    ( select null from dbo.Customers innerCusts
        where
        /* exists inner to outer relationshiop */
        innerCusts.CustomerID = deleteAlias.CustomerID
        and
        /* filter */
        not exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )


--Delete deleteAlias 
  Select * 
from dbo.[Customers] deleteAlias
where exists 
    ( select null from dbo.Customers innerCusts
        where
        /* exists inner to outer relationshiop */
        innerCusts.CustomerID = deleteAlias.CustomerID
        and
        /* filter */
        not exists ( Select null from @CustomerIDHolder innerInnerHolder where innerInnerHolder.CustomerID = innerCusts.CustomerID )
  )