Rust 执行postgresql

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postgres = "0.19.2"   use postgres::{Client, NoTls};   fn main() -> Result<(), postgres::Error> {     let mut client = Client::connect("host=localhost dbname=test user=postgres password=postgres", NoTls)?;       client.batch_execute("         CREATE TABLE person (             id      SERIAL PRIMARY KEY,             name    TEXT NOT NULL,             data    BYTEA         )     ")?;           let name = "Ferris";     let data = None::<&[u8]>;     client.execute(         "INSERT INTO person (name, data) VALUES ($1, $2)",         &[&name, &data],     )?;           for row in client.query("SELECT id, name, data FROM person", &[])? {         let id: i32 = row.get(0);         let name: &str = row.get(1);         let data: Option<&[u8]> = row.get(2);               println!("found person: {} {} {:?}", id, name, data);     }       Ok(()) }