graphitesql 0.0.1

A pure, safe, no_std Rust re-implementation of SQLite, compatible with the SQLite 3 file format.
Documentation 
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//! Phase 7: end-to-end DDL/DML through `Connection::execute` + `query`.

#![cfg(feature = "std")]

use graphitesql::{Connection, Value};
use std::process::Command;

fn temp_path(name: &str) -> String {
    let mut p = std::env::temp_dir();
    p.push(format!("graphitesql-dml-{}-{name}", std::process::id()));
    p.to_string_lossy().into_owned()
}

fn ints(rows: &[Vec<Value>], i: usize) -> Vec<i64> {
    rows.iter()
        .map(|r| match &r[i] {
            Value::Integer(v) => *v,
            o => panic!("not int: {o:?}"),
        })
        .collect()
}

#[test]
fn memory_create_insert_select() {
    let mut c = Connection::open_memory().unwrap();
    c.execute("CREATE TABLE users(id INTEGER PRIMARY KEY, name TEXT, age INT)")
        .unwrap();
    assert_eq!(
        c.execute("INSERT INTO users(name, age) VALUES ('ada', 36), ('grace', 45)")
            .unwrap(),
        2
    );
    // Explicit rowid via the INTEGER PRIMARY KEY column.
    c.execute("INSERT INTO users(id, name, age) VALUES (10, 'edsger', 75)")
        .unwrap();

    let r = c.query("SELECT id, name FROM users ORDER BY id").unwrap();
    assert_eq!(ints(&r.rows, 0), vec![1, 2, 10]);
    assert_eq!(r.rows[0][1], Value::Text("ada".into()));
    assert_eq!(r.rows[2][1], Value::Text("edsger".into()));

    let agg = c.query("SELECT count(*), avg(age) FROM users").unwrap();
    assert_eq!(agg.rows[0][0], Value::Integer(3));
}

#[test]
fn update_and_delete() {
    let mut c = Connection::open_memory().unwrap();
    c.execute("CREATE TABLE t(id INTEGER PRIMARY KEY, v INT)")
        .unwrap();
    c.execute("INSERT INTO t(v) VALUES (10),(20),(30),(40)")
        .unwrap();

    assert_eq!(
        c.execute("UPDATE t SET v = v + 1 WHERE id >= 3").unwrap(),
        2
    );
    let r = c.query("SELECT v FROM t ORDER BY id").unwrap();
    assert_eq!(ints(&r.rows, 0), vec![10, 20, 31, 41]);

    assert_eq!(c.execute("DELETE FROM t WHERE v > 25").unwrap(), 2);
    let r = c.query("SELECT id FROM t ORDER BY id").unwrap();
    assert_eq!(ints(&r.rows, 0), vec![1, 2]);

    assert_eq!(c.execute("DELETE FROM t").unwrap(), 2); // delete all
    assert_eq!(
        c.query("SELECT count(*) FROM t").unwrap().rows[0][0],
        Value::Integer(0)
    );
}

#[test]
fn pragma_table_info_and_page_size() {
    let mut c = Connection::open_memory().unwrap();
    c.execute("CREATE TABLE t(id INTEGER PRIMARY KEY, name TEXT NOT NULL, n INT DEFAULT 7)")
        .unwrap();
    let info = c.query("PRAGMA table_info(t)").unwrap();
    assert_eq!(info.columns[0], "cid");
    assert_eq!(info.rows.len(), 3);
    // id: pk=1, notnull=1 (INTEGER PRIMARY KEY)
    assert_eq!(info.rows[0][1], Value::Text("id".into()));
    assert_eq!(info.rows[0][5], Value::Integer(1)); // pk
                                                    // name: notnull=1
    assert_eq!(info.rows[1][3], Value::Integer(1));
    // n: default '7'
    assert_eq!(info.rows[2][4], Value::Text("7".into()));

    let ps = c.query("PRAGMA page_size").unwrap();
    assert_eq!(ps.rows[0][0], Value::Integer(4096));
}

#[test]
fn defaults_applied() {
    let mut c = Connection::open_memory().unwrap();
    c.execute("CREATE TABLE t(id INTEGER PRIMARY KEY, status TEXT DEFAULT 'new', n INT DEFAULT 0)")
        .unwrap();
    c.execute("INSERT INTO t(id) VALUES (1)").unwrap();
    let r = c.query("SELECT status, n FROM t").unwrap();
    assert_eq!(r.rows[0][0], Value::Text("new".into()));
    assert_eq!(r.rows[0][1], Value::Integer(0));
}

#[test]
fn transactions_commit_and_rollback() {
    let mut c = Connection::open_memory().unwrap();
    c.execute("CREATE TABLE t(id INTEGER PRIMARY KEY)").unwrap();

    c.execute("BEGIN").unwrap();
    c.execute("INSERT INTO t VALUES (1),(2)").unwrap();
    // Read-your-writes inside the transaction.
    assert_eq!(
        c.query("SELECT count(*) FROM t").unwrap().rows[0][0],
        Value::Integer(2)
    );
    c.execute("ROLLBACK").unwrap();
    assert_eq!(
        c.query("SELECT count(*) FROM t").unwrap().rows[0][0],
        Value::Integer(0)
    );

    c.execute("BEGIN").unwrap();
    c.execute("INSERT INTO t VALUES (1),(2),(3)").unwrap();
    c.execute("COMMIT").unwrap();
    assert_eq!(
        c.query("SELECT count(*) FROM t").unwrap().rows[0][0],
        Value::Integer(3)
    );
}

#[test]
fn persists_across_reopen() {
    let path = temp_path("persist.db");
    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(format!("{path}-journal"));
    {
        let mut c = Connection::create(&path).unwrap();
        c.execute("CREATE TABLE kv(k INTEGER PRIMARY KEY, v TEXT)")
            .unwrap();
        c.execute("INSERT INTO kv VALUES (1,'one'),(2,'two')")
            .unwrap();
    }
    {
        let c = Connection::open_readonly(&path).unwrap();
        let r = c.query("SELECT v FROM kv ORDER BY k").unwrap();
        assert_eq!(r.rows[0][0], Value::Text("one".into()));
        assert_eq!(r.rows[1][0], Value::Text("two".into()));
    }
    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(format!("{path}-journal"));
}

#[test]
fn sqlite3_reads_sql_built_database() {
    if Command::new("sqlite3").arg("--version").output().is_err() {
        eprintln!("sqlite3 CLI not found; skipping");
        return;
    }
    let path = temp_path("sqlbuilt.db");
    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(format!("{path}-journal"));
    {
        let mut c = Connection::create(&path).unwrap();
        c.execute("CREATE TABLE items(id INTEGER PRIMARY KEY, name TEXT, price REAL)")
            .unwrap();
        for i in 1..=300 {
            c.execute_params("INSERT INTO items(name, price) VALUES (?1, ?2)", &params(i))
                .unwrap();
        }
    }
    let run = |sql: &str| {
        let out = Command::new("sqlite3")
            .arg(&path)
            .arg(sql)
            .output()
            .unwrap();
        assert!(
            out.status.success(),
            "{}",
            String::from_utf8_lossy(&out.stderr)
        );
        String::from_utf8_lossy(&out.stdout).trim().to_string()
    };
    assert_eq!(run("PRAGMA integrity_check;"), "ok");
    assert_eq!(run("SELECT count(*) FROM items;"), "300");
    assert_eq!(run("SELECT name FROM items WHERE id = 1;"), "item-1");
    assert_eq!(run("SELECT id FROM items ORDER BY id DESC LIMIT 1;"), "300");

    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(format!("{path}-journal"));
}

fn params(i: i64) -> graphitesql::exec::eval::Params {
    graphitesql::exec::eval::Params {
        positional: vec![
            Value::Text(format!("item-{i}")),
            Value::Real(i as f64 * 1.5),
        ],
        named: vec![],
    }
}