arrow-odbc 0.1.4

Read the data of an ODBC data source as sequence of Apache Arrow record batches.

arrow-odbc-py

Fill Apache Arrow arrays from ODBC data sources. This crate is build on top of the pyarrow Python package and arrow-odbc Rust crate and enables you to read the data of an ODBC data source as sequence of Apache Arrow record batches.

State

I am writing this mainly to learn how to exchange Arrow Arrays via the C Interface between Rust and Python. If you happen to know how this is supposed to work your review and contribution would be highly welcome (not that it wouldn't otherwise).

Users looking for a mature solution for bulk fetching data from ODBC data sources in Python should also take a look at turbodbc which has a helpful community and seen a lot more battle testing than this. Also this Python package is more narrow in Scope (which is a fancy way of saying it has less features), as it is only concerned with bulk fetching Arrow Arrays and nothing else.

About Arrow

Apache Arrow defines a language-independent columnar memory format for flat and hierarchical data, organized for efficient analytic operations on modern hardware like CPUs and GPUs. The Arrow memory format also supports zero-copy reads for lightning-fast data access without serialization overhead.

About ODBC

ODBC (Open DataBase Connectivity) is a standard which enables you to access data from a wide variaty of data sources using SQL.

Compatibility

Should work with any Python 3.x and any Arrow version recent enough to support the Arrow C-Interface.

Usage

from arrow_odbc import read_arrow_batches_from_odbc

connection_string="Driver={ODBC Driver 17 for SQL Server};Server=localhost;UID=SA;PWD=My@Test@Password1;"
query = f"SELECT * FROM MyTable"

reader = read_arrow_batches_from_odbc(
    query=query, batch_size=1000, connection_string=connection_string
)

for batch in reader:
    # Process arrow batches
    pass

Matching of ODBC to Arrow types

ODBC	Arrow
Numeric(p <= 38)	Decimal
Decimal(p <= 38)	Decimal
Integer	Int32
SmallInt	Int16
Real	Float32
Float(p <=24)	Float32
Double	Float64
Float(p > 24)	Float64
Date	Date32
LongVarbinary	Binary
Timestamp(p = 0)	TimestampSecond
Timestamp(p: 1..3)	TimestampMilliSecond
Timestamp(p: 4..6)	TimestampMicroSecond
Timestamp(p >= 7 )	TimestampNanoSecond
BigInt	Int64
TinyInt	Int8
Bit	Boolean
Varbinary	Binary
Binary	FixedSizedBinary
All others	Utf8