typedb-driver 3.8.4rc0

TypeDB Driver for Python

TypeDB Python Driver

Driver Architecture

To learn about the mechanism that TypeDB drivers use to set up communication with databases running on the TypeDB Server, refer to the Drivers Overview.

API Reference

To learn about the methods available for executing queries and retrieving their answers using Python, refer to the API Reference.

Install TypeDB Python Driver through Pip

1. Install typedb-driver using pip:

pip install typedb-driver

2. If multiple Python versions are available, you may wish to use:

pip3 install typedb-driver

3. Make sure a TypeDB Server is running.
4. In your python program, import from typedb.driver (see Example usage or tests/integration for examples):

from typedb.driver import *

driver = TypeDB.driver(address=TypeDB.DEFAULT_ADDRESS, ...)

Example usage

from typedb.driver import *


class TypeDBExample:

    def typedb_example(self):
        # Open a driver connection. Specify your parameters if needed
        # The connection will be automatically closed on the "with" block exit
        with TypeDB.driver(TypeDB.DEFAULT_ADDRESS, Credentials("admin", "password"), DriverOptions(is_tls_enabled=False)) as driver:
            # Create a database
            driver.databases.create("typedb")
            database = driver.databases.get("typedb")

            # Use "try" blocks to catch driver exceptions
            try:
                # Open transactions of 3 types
                tx = driver.transaction(database.name, TransactionType.READ)

                # Execute any TypeDB query using TypeQL. Wrong queries are rejected with an explicit exception
                result_promise = tx.query("define entity i-cannot-be-defined-in-read-transactions;")

                print("The result is still promised, so it needs resolving even in case of errors!")
                result_promise.resolve()
            except TypeDBDriverException as expected_exception:
                print(f"Once the query's promise is resolved, the exception is revealed: {expected_exception}")
            finally:
                # Don't forget to close the transaction!
                tx.close()

            # Open a schema transaction to make schema changes
            # Transactions can be opened with configurable options. This option limits its lifetime
            options = TransactionOptions(transaction_timeout_millis=10_000)

            # Use "with" blocks to forget about "close" operations (similarly to connections)
            with driver.transaction(database.name, TransactionType.SCHEMA, options) as tx:
                define_query = """
                define 
                  entity person, owns name, owns age; 
                  attribute name, value string;
                  attribute age, value integer;
                """
                answer = tx.query(define_query).resolve()
                if answer.is_ok():
                    print(f"OK results do not give any extra interesting information, but they mean that the query "
                          f"is successfully executed!")

                # Commit automatically closes the transaction. It can still be safely called inside "with" blocks
                tx.commit()

            # Open a read transaction to safely read anything without database modifications
            with driver.transaction(database.name, TransactionType.READ) as tx:
                answer = tx.query("match entity $x;").resolve()

                # Collect concept rows that represent the answer as a table
                rows = list(answer.as_concept_rows())
                row = rows[0]

                # Collect column names to get concepts by index if the variable names are lost
                header = list(row.column_names())

                column_name = header[0]

                # Get concept by the variable name (column name)
                concept_by_name = row.get(column_name)

                # Get concept by the header's index
                concept_by_index = row.get_index(0)

                print(f"Getting concepts by variable names ({concept_by_name.get_label()}) and "
                      f"indexes ({concept_by_index.get_label()}) is equally correct. ")

                # Check if it's an entity type before the conversion
                if concept_by_name.is_entity_type():
                    print(f"Both represent the defined entity type: '{concept_by_name.as_entity_type().get_label()}' "
                          f"(in case of a doubt: '{concept_by_index.as_entity_type().get_label()}')")

                # Continue querying in the same transaction if needed
                answer = tx.query("match attribute $a;").resolve()

                # Concept rows can be used as any other iterator
                rows = [row for row in answer.as_concept_rows()]

                for row in rows:
                    # Same for column names
                    column_names_iter = row.column_names()
                    column_name = next(column_names_iter)

                    concept_by_name = row.get(column_name)

                    # Check if it's an attribute type before the conversion
                    if concept_by_name.is_attribute_type():
                        attribute_type = concept_by_name.as_attribute_type()
                        print(f"Defined attribute type's label: '{attribute_type.get_label()}', "
                              f"value type: '{attribute_type.try_get_value_type()}'")


                    print(f"It is also possible to just print the concept itself: '{concept_by_name}'")

            # Open a write transaction to insert data
            with driver.transaction(database.name, TransactionType.WRITE) as tx:
                insert_query = "insert $z isa person, has age 10; $x isa person, has age 20, has name \"John\";"
                answer = tx.query(insert_query).resolve()

                # Insert queries also return concept rows
                rows = list(answer.as_concept_rows())
                row = rows[0]

                for column_name in row.column_names():
                    inserted_concept = row.get(column_name)
                    print(f"Successfully inserted ${column_name}: {inserted_concept}")
                    if inserted_concept.is_entity():
                        print("This time, it's an entity, not a type!")

                # It is possible to ask for the column names again
                header = [name for name in row.column_names()]

                x = row.get_index(header.index("x"))
                print("As we expect an entity instance, we can try to get its IID (unique identification): "
                      "{x.try_get_iid()}. ")
                if x.is_entity():
                    print(f"It can also be retrieved directly and safely after a cast: {x.as_entity().get_iid()}")

                # Do not forget to commit if the changes should be persisted
                print('CAUTION: Committing or closing (including leaving the "with" block) a transaction will '
                      'invalidate all its uncollected answer iterators')
                tx.commit()

            # Open another write transaction to try inserting even more data
            with driver.transaction(database.name, TransactionType.WRITE) as tx:
                # When loading a large dataset, it's often better not to resolve every query's promise immediately.
                # Instead, collect promises and handle them later. Alternatively, if a commit is expected in the end,
                # just call `commit`, which will wait for all ongoing operations to finish before executing.
                queries = ["insert $a isa person, has name \"Alice\";", "insert $b isa person, has name \"Bob\";"]
                for query in queries:
                    tx.query(query)
                tx.commit()

            with driver.transaction(database.name, TransactionType.WRITE) as tx:
                # Commit will still fail if at least one of the queries produce an error.
                queries = ["insert $c isa not-person, has name \"Chris\";", "insert $d isa person, has name \"David\";"]
                promises = []
                for query in queries:
                    promises.append(tx.query(query))

                try:
                    tx.commit()
                    assert False, "TypeDBDriverException is expected"
                except TypeDBDriverException as expected_exception:
                    print(f"Commit result will contain the unresolved query's error: {expected_exception}")

            # Open a read transaction to verify that the previously inserted data is saved
            with driver.transaction(database.name, TransactionType.READ) as tx:
                # Queries can also be executed with configurable options. This option forces the database
                # to include types of instance concepts in ConceptRows answers
                options = QueryOptions(include_instance_types=True)

                # A match query can be used for concept row outputs
                var = "x"
                answer = tx.query(f"match ${var} isa person;", options).resolve()

                # Simple match queries always return concept rows
                count = 0
                for row in answer.as_concept_rows():
                    x = row.get(var)
                    x_type = x.as_entity().get_type().as_entity_type()
                    count += 1
                    print(f"Found a person {x} of type {x_type}")
                print(f"Total persons found: {count}")

                # A fetch query can be used for concept document outputs with flexible structure
                fetch_query = """
                match
                  $x isa! person, has $a;
                  $a isa! $t;
                fetch {
                  "single attribute type": $t,
                  "single attribute": $a,
                  "all attributes": { $x.* },
                };
                """
                answer = tx.query(fetch_query).resolve()

                # Fetch queries always return concept documents
                count = 0
                for document in answer.as_concept_documents():
                    count += 1
                    print(f"Fetched a document: {document}.")
                    print(f"This document contains an attribute of type: {document['single attribute type']['label']}")
                print(f"Total documents fetched: {count}")

        print("More examples can be found in the API reference and the documentation.\nWelcome to TypeDB!")