Truncate all table in a database

/*Disable Constraints & Triggers*/

exec sp_MSforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'

exec sp_MSforeachtable 'ALTER TABLE ? DISABLE TRIGGER ALL'


/*Perform delete operation on all table for cleanup*/

exec sp_MSforeachtable 'DELETE ?'


/*Enable Constraints & Triggers again*/

exec sp_MSforeachtable 'ALTER TABLE ? CHECK CONSTRAINT ALL'
exec sp_MSforeachtable 'ALTER TABLE ? ENABLE TRIGGER ALL'

/*Reset Identity on tables with identity column*/

exec sp_MSforeachtable 'IF OBJECTPROPERTY(OBJECT_ID(''?''),

''TableHasIdentity'') = 1 BEGIN DBCC CHECKIDENT (''?'',RESEED,0) END'