asqlite 1.3.1

SQLite wrapper using async Rust
Documentation 
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use asqlite::{params, BlobOpenMode};
use futures::{AsyncReadExt, AsyncWriteExt, StreamExt};
use std::{
    io::{self, SeekFrom},
    sync::atomic::{AtomicUsize, Ordering},
};

fn db_name() -> String {
    static COUNTER: AtomicUsize = AtomicUsize::new(0);

    COUNTER.load(Ordering::Relaxed).to_string()
}

#[tokio::test]
async fn read() {
    let mut conn = asqlite::Connection::builder()
        .write(true)
        .create(true)
        .open_memory(&db_name())
        .await
        .unwrap();

    let blob_value: Vec<u8> = (0..=255).collect();

    conn.execute("CREATE TABLE test (key INTEGER, value BLOB)", ())
        .await
        .unwrap();
    conn.insert(
        "INSERT INTO test (key, value) VALUES (?, ?)",
        params!(1, blob_value),
    )
    .await
    .unwrap();

    let id = conn
        .query::<i64>("SELECT rowid FROM test WHERE key = ?", params!(1))
        .next()
        .await
        .unwrap()
        .unwrap();

    let mut blob = conn
        .open_blob("main", "test", "value", id, BlobOpenMode::ReadOnly)
        .await
        .unwrap();

    assert_eq!(blob.size(), 256);

    let mut buf = [0; 8];
    blob.read_exact(&mut buf).await.unwrap();
    assert_eq!(buf, [0, 1, 2, 3, 4, 5, 6, 7]);
    blob.read_exact(&mut buf).await.unwrap();
    assert_eq!(buf, [8, 9, 10, 11, 12, 13, 14, 15]);
    assert_eq!(blob.seek(SeekFrom::Start(0)).unwrap(), 0);
    blob.read_exact(&mut buf).await.unwrap();
    assert_eq!(buf, [0, 1, 2, 3, 4, 5, 6, 7]);
    assert_eq!(blob.seek(SeekFrom::Current(100)).unwrap(), 108);
    blob.read_exact(&mut buf).await.unwrap();
    assert_eq!(buf, [108, 109, 110, 111, 112, 113, 114, 115]);
    assert_eq!(blob.seek(SeekFrom::End(-50)).unwrap(), 206);
    blob.read_exact(&mut buf).await.unwrap();
    assert_eq!(buf, [206, 207, 208, 209, 210, 211, 212, 213]);

    conn.close().await.unwrap();
}

#[tokio::test]
async fn write() {
    let mut conn = asqlite::Connection::builder()
        .write(true)
        .create(true)
        .open_memory(&db_name())
        .await
        .unwrap();

    conn.execute("CREATE TABLE test (key INTEGER, value BLOB)", ())
        .await
        .unwrap();
    conn.insert(
        "INSERT INTO test (key, value) VALUES (?, ?)",
        params!(1, asqlite::ZeroBlob(16)),
    )
    .await
    .unwrap();

    let id = conn
        .query::<i64>("SELECT rowid FROM test WHERE key = ?", params!(1))
        .next()
        .await
        .unwrap()
        .unwrap();

    let mut blob = conn
        .open_blob("main", "test", "value", id, BlobOpenMode::ReadWrite)
        .await
        .unwrap();

    assert_eq!(blob.size(), 16);

    blob.write(&[1]).await.unwrap();
    blob.seek(SeekFrom::Start(5)).unwrap();
    blob.write(&[10]).await.unwrap();
    blob.flush().await.unwrap();

    blob.seek(SeekFrom::End(0)).unwrap();

    assert_eq!(
        blob.write_all(&[0]).await.unwrap_err().kind(),
        io::ErrorKind::WriteZero,
    );

    drop(blob);

    let data: Vec<u8> = conn
        .query("SELECT value FROM test WHERE key = ?", params!(1))
        .next()
        .await
        .unwrap()
        .unwrap();

    assert_eq!(data, [1, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);

    conn.close().await.unwrap();
}

#[tokio::test]
async fn large() {
    let data: Vec<u8> = (0..1048576).map(|i| i as u8).collect();

    let mut conn = asqlite::Connection::builder()
        .write(true)
        .create(true)
        .open_memory(&db_name())
        .await
        .unwrap();

    conn.execute("CREATE TABLE test (key INTEGER, value BLOB)", ())
        .await
        .unwrap();
    let id = conn
        .insert(
            "INSERT INTO test (key, value) VALUES (?, ?)",
            params!(1, asqlite::ZeroBlob(data.len() as u64)),
        )
        .await
        .unwrap();

    let mut blob = conn
        .open_blob("main", "test", "value", id, BlobOpenMode::ReadWrite)
        .await
        .unwrap();
    blob.write_all(&data).await.unwrap();

    assert_eq!(
        blob.write_all(&[0]).await.unwrap_err().kind(),
        io::ErrorKind::WriteZero,
    );

    blob.flush().await.unwrap();

    assert_eq!(
        &conn
            .query::<Vec<u8>>("SELECT value FROM test WHERE key = ?", asqlite::params!(1))
            .next()
            .await
            .unwrap()
            .unwrap(),
        &data,
    );

    let mut read = vec![0; 1048576];
    blob.seek(SeekFrom::Start(0)).unwrap();
    blob.read_exact(&mut read).await.unwrap();

    assert_eq!(&read, &data);

    assert_eq!(blob.read(&mut [0]).await.unwrap(), 0);
    assert_eq!(
        blob.read_exact(&mut [0]).await.unwrap_err().kind(),
        io::ErrorKind::UnexpectedEof,
    );

    conn.close().await.unwrap();
}