Function arrow_odbc::arrow_schema_from
source · pub fn arrow_schema_from(
resut_set_metadata: &mut impl ResultSetMetadata
) -> Result<Schema, Error>
Expand description
Query the metadata to create an arrow schema. This method is invoked automatically for you by
crate::OdbcReader::new
. You may want to call this method in situtation ther you want to
create an arrow schema without creating the reader yet.
Example
use anyhow::Error;
use arrow_odbc::{arrow_schema_from, arrow::datatypes::Schema, odbc_api::Connection};
fn fetch_schema_for_table(
table_name: &str,
connection: &Connection<'_>
) -> Result<Schema, Error> {
// Query column with values to get a cursor
let sql = format!("SELECT * FROM {}", table_name);
let mut prepared = connection.prepare(&sql)?;
// Now that we have prepared statement, we want to use it to query metadata.
let schema = arrow_schema_from(&mut prepared)?;
Ok(schema)
}