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134
metadata-ingestion/examples/library/create_ermodelrelationship.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| import time | ||
|
|
||
| from datahub.emitter.mce_builder import make_data_platform_urn, make_dataset_urn | ||
| from datahub.emitter.mcp import MetadataChangeProposalWrapper | ||
| from datahub.emitter.rest_emitter import DatahubRestEmitter | ||
| from datahub.metadata.schema_classes import ( | ||
| AuditStampClass, | ||
| ERModelRelationshipCardinalityClass, | ||
| ERModelRelationshipKeyClass, | ||
| ERModelRelationshipPropertiesClass, | ||
| NumberTypeClass, | ||
| OtherSchemaClass, | ||
| RelationshipFieldMappingClass, | ||
| SchemaFieldClass, | ||
| SchemaFieldDataTypeClass, | ||
| SchemaMetadataClass, | ||
| StringTypeClass, | ||
| ) | ||
|
|
||
| # Configuration | ||
| GMS_ENDPOINT = "http://localhost:8080" | ||
| PLATFORM = "mysql" | ||
| ENV = "PROD" | ||
|
|
||
| e = DatahubRestEmitter(gms_server=GMS_ENDPOINT, extra_headers={}) | ||
|
|
||
|
|
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| def get_schema_field( | ||
| name: str, dtype: str, type: SchemaFieldDataTypeClass | ||
| ) -> SchemaFieldClass: | ||
| """Creates a schema field for MySQL columns.""" | ||
|
|
||
| field = SchemaFieldClass( | ||
| fieldPath=name, | ||
| type=type, | ||
| nativeDataType=dtype, | ||
| description=name, | ||
| lastModified=AuditStampClass( | ||
| time=int(time.time() * 1000), | ||
| actor="urn:li:corpuser:ingestion", | ||
| ), | ||
| ) | ||
| if name == "id": | ||
| field.isPartitioningKey = True | ||
| return field | ||
|
|
||
|
|
||
| # Define Employee Table | ||
| dataset_employee = make_dataset_urn(PLATFORM, "Employee", ENV) | ||
| employee_fields = [ | ||
| get_schema_field("id", "int", SchemaFieldDataTypeClass(type=NumberTypeClass())), | ||
| get_schema_field( | ||
| "name", "varchar", SchemaFieldDataTypeClass(type=StringTypeClass()) | ||
| ), | ||
| get_schema_field("age", "int", SchemaFieldDataTypeClass(type=NumberTypeClass())), | ||
| get_schema_field( | ||
| "company_id", "int", SchemaFieldDataTypeClass(type=NumberTypeClass()) | ||
| ), | ||
| ] | ||
|
|
||
| e.emit_mcp( | ||
| MetadataChangeProposalWrapper( | ||
| entityUrn=dataset_employee, | ||
| aspect=SchemaMetadataClass( | ||
| schemaName="Employee", | ||
| platform=make_data_platform_urn(PLATFORM), | ||
| fields=employee_fields, | ||
| version=0, | ||
| hash="", | ||
| platformSchema=OtherSchemaClass(rawSchema=""), | ||
| ), | ||
| ) | ||
| ) | ||
|
|
||
| # Define Company Table | ||
| dataset_company = make_dataset_urn(PLATFORM, "Company", ENV) | ||
| company_fields = [ | ||
| get_schema_field("id", "int", SchemaFieldDataTypeClass(type=NumberTypeClass())), | ||
| get_schema_field( | ||
| "name", "varchar", SchemaFieldDataTypeClass(type=StringTypeClass()) | ||
| ), | ||
| ] | ||
|
|
||
| e.emit_mcp( | ||
| MetadataChangeProposalWrapper( | ||
| entityUrn=dataset_company, | ||
| aspect=SchemaMetadataClass( | ||
| schemaName="Company", | ||
| platform=make_data_platform_urn(PLATFORM), | ||
| fields=company_fields, | ||
| version=0, | ||
| hash="", | ||
| platformSchema=OtherSchemaClass(rawSchema=""), | ||
| ), | ||
| ) | ||
| ) | ||
|
|
||
| # Establish Relationship (Foreign Key: Employee.company_id → Company.id) | ||
| relationship_key = ERModelRelationshipKeyClass(id="employee_to_company") | ||
| relationship_properties = ERModelRelationshipPropertiesClass( | ||
| name="Employee to Company Relationship", | ||
| source=dataset_employee, | ||
| destination=dataset_company, | ||
| relationshipFieldMappings=[ | ||
| RelationshipFieldMappingClass(sourceField="company_id", destinationField="id") | ||
| ], | ||
| cardinality=ERModelRelationshipCardinalityClass.N_ONE, | ||
| customProperties={"constraint": "Foreign Key", "index": "company_id"}, | ||
| ) | ||
|
|
||
| relationship_urn = f"urn:li:erModelRelationship:{relationship_key.id}" | ||
|
|
||
| e.emit_mcp( | ||
| MetadataChangeProposalWrapper( | ||
| entityType="erModelRelationship", | ||
| changeType="UPSERT", | ||
| entityKeyAspect=relationship_key, | ||
| aspectName=relationship_key.ASPECT_NAME, | ||
| aspect=relationship_key, | ||
| ) | ||
| ) | ||
|
|
||
| e.emit_mcp( | ||
| MetadataChangeProposalWrapper( | ||
| entityUrn=relationship_urn, | ||
| entityType="erModelRelationship", | ||
| changeType="UPSERT", | ||
| aspectName=relationship_properties.ASPECT_NAME, | ||
| aspect=relationship_properties, | ||
| ) | ||
| ) | ||
|
|
||
| print("relationship_urn", relationship_urn) | ||
| print("Employee and Company tables created with ERModelRelationship linking them.") |
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