ifcopenshell.sql

Module Contents

class ifcopenshell.sql.sqlite(filepath)

Bases: ifcopenshell.file.file

Base class for containing IFC files.

Class has instance methods for filtering by element Id, Type, etc. Instantiated objects can be subscripted by Id or Guid

Example:

model = ifcopenshell.open(file_path)
products = model.by_type("IfcProduct")
print(products[0].id(), products[0].GlobalId) # 122 2XQ$n5SLP5MBLyL442paFx
print(products[0] == model[122] == model["2XQ$n5SLP5MBLyL442paFx"]) # True

Create a new blank IFC model

This IFC model does not have any entities in it yet. See the create_entity function for how to create new entities. All data is stored in memory. If you wish to write the IFC model to disk, see the write function.

Parameters:

  • f – The underlying IfcOpenShell file object to be wrapped. This is an internal implementation detail and should generally be left as None by users.

  • schema (string) – Which IFC schema to use, chosen from “IFC2X3”, “IFC4”, or “IFC4X3”. These refer to the ISO approved versions of IFC. Defaults to “IFC4” if not specified, which is currently recommended for all new projects.

  • schema_version (tuple[int, int, int, int]) – If you want to specify an exact version of IFC that may not be an ISO approved version, use this argument instead of schema. IFC versions on technical.buildingsmart.org are described using 4 integers representing the major, minor, addendum, and corrigendum number. For example, (4, 0, 2, 1) refers to IFC4 ADD2 TC1, which is the official version approved by ISO when people refer to “IFC4”. Generally you should not use this argument unless you are testing non-ISO IFC releases.

Example:

# Create a new IFC4 model, create a wall, then save it to an IFC-SPF file.
model = ifcopenshell.file()
model.create_entity("IfcWall")
model.write("/path/to/model.ifc")

# Create a new IFC4X3 model
model = ifcopenshell.file(schema="IFC4X3")

# A poweruser testing out a particular version of IFC4X3
model = ifcopenshell.file(schema_version=(4, 3, 0, 1))
by_id(id)

Return an IFC entity instance filtered by IFC ID.

Parameters:

id (int) – STEP numerical identifier

Raises:

RuntimeError – If id is not found.

Returns:

An ifcopenshell.entity_instance

Return type:

ifcopenshell.entity_instance

by_type(type, include_subtypes=True)

Return IFC objects filtered by IFC Type and wrapped with the entity_instance class.

If an IFC type class has subclasses, all entities of those subclasses are also returned.

Parameters:

  • type (string) – The case insensitive type of IFC class to return.

  • include_subtypes (bool) – Whether or not to return subtypes of the IFC class

Raises:

RuntimeError – If type is not found in IFC schema.

Returns:

A list of ifcopenshell.entity_instance objects

Return type:

list[ifcopenshell.entity_instance]

clear_cache()
create_entity(type, *args, **kawrgs)

Create a new IFC entity in the file.

Parameters:

  • type (string) – Case insensitive name of the IFC class

  • args – The positional arguments of the IFC class

  • kwargs – The keyword arguments of the IFC class

Returns:

An entity instance

Return type:

ifcopenshell.entity_instance

Example:

f = ifcopenshell.file()
f.create_entity("IfcPerson")
# >>> #1=IfcPerson($,$,$,$,$,$,$,$)
f.create_entity("IfcPerson", "Foobar")
# >>> #2=IfcPerson('Foobar',$,$,$,$,$,$,$)
f.create_entity("IfcPerson", Identification="Foobar")
# >>> #3=IfcPerson('Foobar',$,$,$,$,$,$,$)
get_geometry(ids: list[int]) → dict[str, dict]
get_inverse(inst, allow_duplicate=False, with_attribute_indices=False)

Return a list of entities that reference this entity

Parameters:

  • inst (ifcopenshell.entity_instance) – The entity instance to get inverse relationships

  • allow_duplicate – Returns a list when True, set when False

  • with_attribute_indices – Returns pairs of <i, idx> where i[idx] is inst or contains inst. Requires allow_duplicate=True

Returns:

A list of ifcopenshell.entity_instance objects

Return type:

list[ifcopenshell.entity_instance]

is_entity_list(attribute)
preprocess_schema()
traverse(inst, max_levels=None, breadth_first=False)

Get a list of all referenced instances for a particular instance including itself

Parameters:

  • inst (ifcopenshell.entity_instance) – The entity instance to get all sub instances

  • max_levels (bool) – How far deep to recursively fetch sub instances. None or -1 means infinite.

  • breadth_first – Whether to use breadth-first search, the default is depth-first.

Returns:

A list of ifcopenshell.entity_instance objects

Return type:

list[ifcopenshell.entity_instance]

class ifcopenshell.sql.sqlite_entity(id, ifc_class, file=None)

Bases: ifcopenshell.entity_instance.entity_instance

Represents an entity (wall, slab, property, etc) of an IFC model

An IFC model consists of entities. Examples of entities include walls, slabs, doors and so on. Entities can also be non-physical things, like properties, systems, construction tasks, colours, geometry, and more.

Entities are defined through an IFC Class. There are hundreds of IFC Classes defined as part of the ISO standard by the buildingSMART International organisation. The IFC Class defines the attributes of an entity, as well as the data types and whether or not an attribute is mandatory or optional.

IfcOpenShell’s API dynamically implements the IFC schema. You will not find documentation about available IFC Classes, or what attributes they have. Please consult the buildingSMART official documentation or start reading Introduction to IFC.

In addition to the Python methods you see documented here, an instantiated entity_instance will have attributes defined by its IFC class. For example, an entity instance which is an IfcWall class will have a Name attribute, and an IfcColourRgb will have a Red attribute. Please consult the buildingSMART official documentation.

Example:

model = ifcopenshell.open(file_path)
walls = model.by_type("IfcWall")
wall = walls[0]

print(wall) # #38=IFCWALL('2MEinnTPbCMwLOgceaQZFu',$,$,'My Wall',$,#52,#47,$,$);
print(wall.is_a()) # IfcWall

# Note: the `Name` attribute is dynamic, based on the IFC class.
print(wall.Name) # My Wall

# Attributes are ordered and may also be accessed via index.
print(wall[3]) # My Wall

print(wall.__class__) # <class 'ifcopenshell.entity_instance'>
get_info(include_identifier=True, recursive=False, return_type=dict, ignore=(), scalar_only=False)

Return a dictionary of the entity_instance’s properties (Python and IFC) and their values.

Parameters:

  • include_identifier (bool) – Whether or not to include the STEP numerical identifier

  • recursive (bool) – Whether or not to convert referenced IFC elements into dictionaries too. All attributes also apply recursively

  • return_type (dict|list|other) – The return data type to be casted into

  • ignore (set|list) – A list of attribute names to ignore

  • scalar_only (bool) – Filters out all values that are IFC instances

Returns:

A dictionary of properties and their corresponding values

Return type:

dict

Example:

ifc_file = ifcopenshell.open(file_path)
products = ifc_file.by_type("IfcProduct")
obj_info = products[0].get_info()
print(obj_info.keys())
>>> dict_keys(['Description', 'Name', 'BuildingAddress', 'LongName', 'GlobalId', 'ObjectPlacement', 'OwnerHistory', 'ObjectType',
>>> ...'ElevationOfTerrain', 'CompositionType', 'id', 'Representation', 'type', 'ElevationOfRefHeight'])
id()

Return the STEP numerical identifier

Return type:

int

unserialise_value(value)
class ifcopenshell.sql.sqlite_wrapper(id, ifc_class, file)