ODBC wrapper for safe idiomatic Rust

Library for writing ODBC applications in Rust.

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```rust extern crate odbc; // Use this crate and set environmet variable RUSTLOG=odbc to see ODBC warnings extern crate envlogger; use odbc::*; use std::io;

fn main() {

env_logger::init().unwrap();

match connect() {
    Ok(()) => println!("Success"),
    Err(diag) => println!("Error: {}", diag),
}

}

fn connect() -> std::result::Result<(), DiagnosticRecord> {

let env = Environment::new().unwrap();
let env3 = env.set_odbc_version_3()?;

let conn = DataSource::with_parent(&env3)?;

let mut buffer = String::new();
println!("Please enter connection string: ");
io::stdin().read_line(&mut buffer).unwrap();

let mut conn = conn.connect_with_connection_string(&buffer)?;
execute_statement(&mut conn)

}

fn executestatement(mut conn: &mut DataSource) -> Result<()> { let stmt = Statement::withparent(&mut conn)?;

let mut sql_text = String::new();
println!("Please enter SQL statement string: ");
io::stdin().read_line(&mut sql_text).unwrap();

match stmt.exec_direct(&sql_text)?{
    Data(mut stmt) =>{
        let cols = stmt.num_result_cols()?;
        while let Some(mut cursor) = stmt.fetch()? {
            for i in 1..(cols + 1) {
                match cursor.get_data::<String>(i as u16)? {
                    Some(val) => print!(" {}", val),
                    None => print!(" NULL"),
                }
            }
            println!("");
        }
    }
    NoData(_) => println!("Query executed, no data returned")
}

Ok(())

} ```