Sql server 我一直是个节目主持人,完全同意。然而,若整个数据库或相关表非常小且“无关紧要”,那个么它可以加快开发和测试。 with Fkeys as ( select distinct OnTable = onTableSch
Sql server 我一直是个节目主持人,完全同意。然而,若整个数据库或相关表非常小且“无关紧要”,那个么它可以加快开发和测试。 with Fkeys as ( select distinct OnTable = onTableSch,sql-server,tsql,Sql Server,Tsql,我一直是个节目主持人,完全同意。然而,若整个数据库或相关表非常小且“无关紧要”,那个么它可以加快开发和测试。 with Fkeys as ( select distinct OnTable = onTableSchema.name + '.' + OnTable.name ,AgainstTable = againstTableSchema.name + '.' + AgainstTable.name from
我一直是个节目主持人,完全同意。然而,若整个数据库或相关表非常小且“无关紧要”,那个么它可以加快开发和测试。
with Fkeys as (
select distinct
OnTable = onTableSchema.name + '.' + OnTable.name
,AgainstTable = againstTableSchema.name + '.' + AgainstTable.name
from
sysforeignkeys fk
inner join sys.objects onTable
on fk.fkeyid = onTable.object_id
inner join sys.objects againstTable
on fk.rkeyid = againstTable.object_id
inner join sys.schemas onTableSchema
on onTable.schema_id = onTableSchema.schema_id
inner join sys.schemas againstTableSchema
on againstTable.schema_id = againstTableSchema.schema_id
where 1=1
AND AgainstTable.TYPE = 'U'
AND OnTable.TYPE = 'U'
-- ignore self joins; they cause an infinite recursion
and onTableSchema.name + '.' + OnTable.name <> againstTableSchema.name + '.' + AgainstTable.name
)
,MyData as (
select
OnTable = s.name + '.' + o.name
,AgainstTable = FKeys.againstTable
from
sys.objects o
inner join sys.schemas s
on o.schema_id = s.schema_id
left join FKeys
on s.name + '.' + o.name = FKeys.onTable
left join Fkeys fk2
on s.name + '.' + o.name = fk2.AgainstTable
and fk2.OnTable = Fkeys.AgainstTable
where 1=1
and o.type = 'U'
and o.name not like 'sys%'
and fk2.OnTable is null
)
,MyRecursion as (
-- base case
select
TableName = OnTable
,Lvl = 1
from
MyData
where 1=1
and AgainstTable is null
-- recursive case
union all select
TableName = OnTable
,Lvl = r.Lvl + 1
from
MyData d
inner join MyRecursion r
on d.AgainstTable = r.TableName
)
select
Lvl = max(Lvl)
,TableName
,strSql = 'delete from [' + tablename + ']'
from
MyRecursion
group by
TableName
order by
1 desc
,2 desc
DECLARE @masterTableName varchar(1000)
SET @masterTableName = 'Employee'
DECLARE @ScannedTables TABLE( Level int, Name varchar(1000) collate Latin1_General_CI_AS )
DECLARE @currentTableCount INT
DECLARE @previousTableCount INT
DECLARE @level INT
SET @currentTableCount = 0
SET @previousTableCount = -1
SET @level = 0
INSERT INTO @ScannedTables VALUES ( @level, @masterTableName )
WHILE @previousTableCount <> @currentTableCount
BEGIN
SET @previousTableCount = @currentTableCount
INSERT INTO @ScannedTables
SELECT DISTINCT
@level + 1, TC.Table_Name COLLATE Latin1_General_CI_AS
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS TC
LEFT JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC ON TC.Constraint_Name = RC.Constraint_Name
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FTC ON RC.Unique_Constraint_Name = FTC.Constraint_Name
WHERE TC.CONSTRAINT_TYPE = 'FOREIGN KEY'
AND FTC.TABLE_NAME COLLATE Latin1_General_CI_AS IN ( SELECT Name FROM @ScannedTables WHERE Level = @level )
AND TC.Table_Name COLLATE Latin1_General_CI_AS NOT IN ( SELECT Name FROM @ScannedTables )
SET @level = @level + 1
SELECT @currentTableCount = COUNT(*) FROM @ScannedTables
END
SELECT * FROM @ScannedTables