Beginning of data persistence module.

backend/src/db.rs

@@ -1,6 +1,39 @@
+use std::path::Path;
+use std::fs;
 
+//use rusqlite::types::ToSql;
+//use rusqlite::{Connection, Result, NO_PARAMS};
 
+const CURRENT_DB_VERSION: u32 = 1;
 
-fn create_or_update() {
+struct Connection {
+    pub sqlite_con : rusqlite::Connection
+}
 
+impl Connection {
+    fn new() -> Connection {
+
+        // TODO: use a constant in consts module.
+        let data_dir = Path::new("data");
+
+        if !data_dir.exists() {
+            fs::DirBuilder::new().create(data_dir).unwrap();
+        }
+
+        Connection { sqlite_con : rusqlite::Connection::open(data_dir.join("recipes.sqlite")).unwrap() }
+    }
+}
+
+pub fn create_or_update() {
+    let connection = Connection::new();
+
+    // let mut stmt = connection.sqlite_con.prepare("SELECT * FROM versions ORDER BY date").unwrap();
+
+    //let mut stmt = connection.sqlite_con..prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='versions'").unwrap();
+    connection.sqlite_con.query_row(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='versions'",
+        rusqlite::NO_PARAMS,
+        |row| Ok(dbg!("test"))
+    )
+    .unwrap();
 }