r2d2-odbc

ODBC adapter for r2d2 connection pool

Example:

```rust

extern crate r2d2; extern crate r2d2_odbc; extern crate odbc;

use std::thread; use r2d2_odbc::ODBCConnectionManager; use odbc::*;

fn main() { let manager = ODBCConnectionManager::new("DSN=PostgreSQL"); let pool = r2d2::Pool::new(manager).unwrap();

let mut children = vec![];
for i in 0..10i32 {
    let pool = pool.clone();
    children.push(thread::spawn(move || {
        let pool_conn = pool.get().unwrap();
        let conn = pool_conn.raw();
        let stmt = Statement::with_parent(&conn).unwrap();
        if let Data(mut stmt) = stmt.exec_direct("SELECT version()").unwrap() {
            while let Some(mut cursor) = stmt.fetch().unwrap() {
                if let Some(val) = cursor.get_data::<&str>(1).unwrap() {
                    println!("THREAD {} {}", i, val);
                }
            }
        }
    }));
}

for child in children {
    let _ = child.join();
}

}

```