72 lines
1.7 KiB
Rust
72 lines
1.7 KiB
Rust
//! Database Driver for SQLite
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//!
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//! Use of this driver requires enabling the `sqlite` feature.
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//!
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//! Uses the [rusqlite](https://crates.io/crates/rusqlite) crate for
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//! interfacing with the database
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use super::*;
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use slite::NO_PARAMS;
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use slite::{params, Connection, Result as SResult};
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use std::cell::RefCell;
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/// The struct implementing the `DatabaseDriver` trait
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#[derive(Debug)]
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pub struct SQLiteDriver {
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connection: RefCell<Option<Connection>>,
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}
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impl SQLiteDriver {
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/// Create an SQLiteDriver driver
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pub fn new(dsn: &str) -> Self {
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let mut driver = SQLiteDriver {
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connection: RefCell::new(None),
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};
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driver.connect(dsn);
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driver
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}
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fn connect(&mut self, dsn: &str) {
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let connection = if dsn == ":memory:" {
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Connection::open_in_memory().unwrap()
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} else {
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Connection::open(dsn).unwrap()
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};
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self.connection = RefCell::new(Some(connection));
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}
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}
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impl DatabaseDriver for SQLiteDriver {
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fn query(&self, sql: &str) -> Result<Box<dyn Any>, Box<dyn Any>> {
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if self.connection.borrow().is_none() {
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panic!("No database connection.");
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}
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self.connection
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.borrow_mut()
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.as_mut()
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.unwrap()
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.execute(sql, NO_PARAMS);
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// TODO: map native result to generic result
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unimplemented!();
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}
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/// Return the sql to empty a table
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fn truncate(&self, table: &str) -> String {
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String::from("DELETE FROM ")
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+ &self.quote_identifier(table)
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}
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fn explain(&self, sql: &str) -> String {
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format!("EXPLAIN QUERY PLAN {}", sql)
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}
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fn random(&self) -> String {
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String::from(" RANDOM()")
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}
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}
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