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use error::Result;
const SCHEMA: &'static str = "
CREATE TABLE `tracks` (
artist varchar(1024) NOT NULL,
album varchar(1024) DEFAULT NULL,
name varchar(1024) NOT NULL,
timestamp integer(11) NOT NULL
);
";
pub struct DB {
conn: rusqlite::Connection,
}
impl DB {
pub fn new<P: AsRef<std::path::Path>>(path: &P) -> Result<DB> {
let conn = if path.as_ref().exists() {
rusqlite::Connection::open(path)?
}
else {
Self::create(path)?
};
return Ok(DB { conn })
}
fn create<P: AsRef<std::path::Path>>(
path: &P
) -> Result<rusqlite::Connection> {
println!(
"Initializing database at {}",
path.as_ref().to_string_lossy(),
);
if let Some(parent) = path.as_ref().parent() {
std::fs::create_dir_all(parent)?;
let conn = rusqlite::Connection::open(path)?;
conn.execute(SCHEMA, rusqlite::NO_PARAMS)?;
Ok(conn)
}
else {
unimplemented!();
}
}
pub fn most_recent_timestamp(&self) -> Result<Option<i64>> {
Ok(self.conn.query_row(
"SELECT timestamp FROM tracks ORDER BY timestamp DESC LIMIT 1",
rusqlite::NO_PARAMS,
|row| Some(row.get(0))
).or_else(|e| {
match e {
rusqlite::Error::QueryReturnedNoRows => Ok(None),
_ => Err(e),
}
})?)
}
}
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