engines moved to separate library

lib/engines/mssql/foreign_keys.sql

@@ -0,0 +1,38 @@
+SELECT
+    schemaName = FK.TABLE_SCHEMA,
+    pureName = FK.TABLE_NAME,
+    columnName = CU.COLUMN_NAME,
+
+    refSchemaName = ISNULL(IXS.name, PK.TABLE_SCHEMA),
+    refTableName = ISNULL(IXT.name, PK.TABLE_NAME),
+    refColumnName = IXCC.name,
+
+    constraintName = C.CONSTRAINT_NAME,
+    updateAction = rc.UPDATE_RULE,
+    deleteAction = rc.DELETE_RULE,
+
+    objectId = o.object_id 
+
+FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C
+INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME
+
+LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME
+LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CU ON C.CONSTRAINT_NAME = CU.CONSTRAINT_NAME
+--LEFT JOIN (
+--SELECT i1.TABLE_NAME, i2.COLUMN_NAME
+--FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS i1
+--INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE i2 ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME
+--WHERE i1.CONSTRAINT_TYPE = 'PRIMARY KEY'
+--) PT ON PT.TABLE_NAME = PK.TABLE_NAME
+INNER JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc ON FK.CONSTRAINT_NAME = rc.CONSTRAINT_NAME
+
+LEFT JOIN sys.indexes IX ON IX.name = C.UNIQUE_CONSTRAINT_NAME
+LEFT JOIN sys.objects IXT ON IXT.object_id = IX.object_id
+LEFT JOIN sys.index_columns IXC ON IX.index_id = IXC.index_id and IX.object_id = IXC.object_id
+LEFT JOIN sys.columns IXCC ON IXCC.column_id = IXC.column_id AND IXCC.object_id = IXC.object_id
+LEFT JOIN sys.schemas IXS ON IXT.schema_id = IXS.schema_id
+
+inner join sys.objects o on FK.TABLE_NAME = o.name
+inner join sys.schemas s on o.schema_id = s.schema_id and FK.TABLE_SCHEMA = s.name
+
+where o.object_id =[OBJECT_ID_CONDITION]