Fill Apache Arrow arrays from ODBC data sources.
Usage
use arrow_odbc::{odbc_api::Environment, OdbcReader};
const CONNECTION_STRING: &str = "\
Driver={ODBC Driver 17 for SQL Server};\
Server=localhost;\
UID=SA;\
PWD=My@Test@Password1;\
";
fn main() -> Result<(), anyhow::Error> {
// Your application is fine if you spin up only one Environment.
let odbc_environment = unsafe {
Environment::new().unwrap()
};
// Connect with database.
let connection = odbc_environment.connect_with_connection_string(CONNECTION_STRING)?;
// This SQL statement does not require any arguments.
let parameters = ();
// Execute query and create result set
let cursor = connection
.execute("SELECT * FROM MyTable", parameters)?
.expect("SELECT statement must produce a cursor");
// Each batch shall only consist of maximum 10.000 rows.
let max_batch_size = 10_000;
// Read result set as arrow batches. Infer Arrow types automatically using the meta
// information of `cursor`.
let arrow_record_batches = OdbcReader::new(cursor, max_batch_size)?;
for batch in arrow_record_batches {
// ... process batch ...
}
Ok(())
}