odbc2parquet-0.2.1 is not a library.
ODBC to Parquet
A command line tool to query an ODBC data source and write the result into a parquet file.
Usage
Query using connection string
odbc2parquet --connection-string "Driver={ODBC Driver 17 for SQL Server};Server=localhost;UID=SA;PWD=<YourStrong@Passw0rd>;" "SELECT * FROM Birthdays" out.par1
Query using data source name
odbc2parquet --dsn my_db --password "<YourStrong@Passw0rd>" --user "SA" "SELECT * FROM Birthdays" out.par1
Use odbc2parquet --help to see all option.
Installation
Download binary from GitHub
https://github.com/pacman82/odbc2parquet/releases/latest
Note: Download the 32 Bit version if you want to connect to data sources using 32 Bit drivers and download the 64 Bit version if you want to connect via 64 Bit drivers. It won't work vice versa.
Via Cargo
If you have a rust nightly toolchain installed, you can install this tool via cargo.
cargo +nightly install odbc2parquet
Mapping of types
The tool queries the ODBC Data source for type information and maps it to parquet type as such:
| ODBC SQL Type | Parquet Logical Type |
|---|---|
| Decimal(p=0..18, s=0) | Decimal(p,s) |
| Numeric(p=0..18, s=0) | Decimal(p,s) |
| Bit | Boolean |
| Double | Double |
| Real | Float |
| Float | Float |
| Tiny Integer | Int8 |
| Small Integer | Int16 |
| Integer | Int32 |
| Big Int | Int64 |
| Date | Date |
| Timestamp | Timestamp Microseconds |
| All others | Utf8 Byte Array |
p is short for precision. s is short for scale. Intervals are inclusive the last element.