Step 7- Create all foreign keys.sql

--Ref. link: https://www.mssqltips.com/sqlservertip/3443/script-all-primary-keys-unique-constraints-and-foreign-keys-in-a-sql-server-database-using-tsql/
--Export all foreign keys
declare @ForeignKeyID int
declare @ForeignKeyName varchar(4000)
declare @ParentTableName varchar(4000)
declare @ParentColumn varchar(4000)
declare @ReferencedTable varchar(4000)
declare @ReferencedColumn varchar(4000)
declare @StrParentColumn varchar(max)
declare @StrReferencedColumn varchar(max)
declare @ParentTableSchema varchar(4000)
declare @ReferencedTableSchema varchar(4000)
declare @TSQLCreationFK varchar(max)
--Written by Percy Reyes www.percyreyes.com
declare CursorFK cursor for select object_id--, name, object_name( parent_object_id) 
from sys.foreign_keys
open CursorFK
fetch next from CursorFK into @ForeignKeyID
while (@@FETCH_STATUS=0)
begin
 set @StrParentColumn=''
 set @StrReferencedColumn=''
 declare CursorFKDetails cursor for
  select  fk.name ForeignKeyName, schema_name(t1.schema_id) ParentTableSchema,
  object_name(fkc.parent_object_id) ParentTable, c1.name ParentColumn,schema_name(t2.schema_id) ReferencedTableSchema,
   object_name(fkc.referenced_object_id) ReferencedTable,c2.name ReferencedColumn
  from --sys.tables t inner join 
  sys.foreign_keys fk 
  inner join sys.foreign_key_columns fkc on fk.object_id=fkc.constraint_object_id
  inner join sys.columns c1 on c1.object_id=fkc.parent_object_id and c1.column_id=fkc.parent_column_id 
  inner join sys.columns c2 on c2.object_id=fkc.referenced_object_id and c2.column_id=fkc.referenced_column_id 
  inner join sys.tables t1 on t1.object_id=fkc.parent_object_id 
  inner join sys.tables t2 on t2.object_id=fkc.referenced_object_id 
  where fk.object_id=@ForeignKeyID
 open CursorFKDetails
 fetch next from CursorFKDetails into  @ForeignKeyName, @ParentTableSchema, @ParentTableName, @ParentColumn, @ReferencedTableSchema, @ReferencedTable, @ReferencedColumn
 while (@@FETCH_STATUS=0)
 begin    
  set @StrParentColumn=@StrParentColumn + ', ' + @ParentColumn
  set @StrReferencedColumn=@StrReferencedColumn + ', ' + @ReferencedColumn
  
     fetch next from CursorFKDetails into  @ForeignKeyName, @ParentTableSchema, @ParentTableName, @ParentColumn, @ReferencedTableSchema, @ReferencedTable, @ReferencedColumn
 end
 close CursorFKDetails
 deallocate CursorFKDetails

 set @StrParentColumn=substring(@StrParentColumn,2,len(@StrParentColumn)-1)
 set @StrReferencedColumn=substring(@StrReferencedColumn,2,len(@StrReferencedColumn)-1)
 set @TSQLCreationFK='ALTER TABLE '+ @ParentTableSchema+'.'+ @ParentTableName +'  ADD CONSTRAINT '+ @ForeignKeyName
 + ' FOREIGN KEY('+ltrim(@StrParentColumn)+') '+ char(13) +'REFERENCES '+ @ReferencedTableSchema +'.'+ @ReferencedTable+' ('+ltrim(@StrReferencedColumn)+');' + char(13)+'select 1;'
 
 print @TSQLCreationFK

fetch next from CursorFK into @ForeignKeyID 
end
close CursorFK
deallocate CursorFK