It takes long time to get FK information on my database, about a 100 second for ~270 foreign keys (SQL 2012). I replaced the query (declared as private const string ForeignKeySQL in EF.Reverse.POCO.Core.ttinclude) with another query based on sys system views, and it now takes only 120 ms :):
```
private const string ForeignKeySQL = @"
select
FK_Table = o2.name,
FK_Column = c2.name,
PK_Table = o1.name,
PK_Column = c1.name,
Constraint_Name = object_name(f.object_id),
fkSchema = schema_name(o2.schema_id),
pkSchema = schema_name(o1.schema_id),
primaryKey = c1.name
--PK_NAME = i.name
from
sys.objects o1,
sys.objects o2,
sys.columns c1,
sys.columns c2,
sys.foreign_keys f inner join
sys.foreign_key_columns k on (k.constraint_object_id = f.object_id) inner join
sys.indexes i on (f.referenced_object_id = i.object_id and f.key_index_id = i.index_id)
where
o1.object_id = f.referenced_object_id and
o2.object_id = f.parent_object_id and
c1.object_id = f.referenced_object_id and
c2.object_id = f.parent_object_id and
c1.column_id = k.referenced_column_id and
c2.column_id = k.parent_column_id
order by 1, 2, 3, 4
";
```
other queries can probably also be made faster, but this one took the longest time to execute anyway.
```
private const string ForeignKeySQL = @"
select
FK_Table = o2.name,
FK_Column = c2.name,
PK_Table = o1.name,
PK_Column = c1.name,
Constraint_Name = object_name(f.object_id),
fkSchema = schema_name(o2.schema_id),
pkSchema = schema_name(o1.schema_id),
primaryKey = c1.name
--PK_NAME = i.name
from
sys.objects o1,
sys.objects o2,
sys.columns c1,
sys.columns c2,
sys.foreign_keys f inner join
sys.foreign_key_columns k on (k.constraint_object_id = f.object_id) inner join
sys.indexes i on (f.referenced_object_id = i.object_id and f.key_index_id = i.index_id)
where
o1.object_id = f.referenced_object_id and
o2.object_id = f.parent_object_id and
c1.object_id = f.referenced_object_id and
c2.object_id = f.parent_object_id and
c1.column_id = k.referenced_column_id and
c2.column_id = k.parent_column_id
order by 1, 2, 3, 4
";
```
other queries can probably also be made faster, but this one took the longest time to execute anyway.
