+use std::path::Path;\r
+use std::fs;\r
\r
+//use rusqlite::types::ToSql;\r
+//use rusqlite::{Connection, Result, NO_PARAMS};\r
\r
+//extern crate r2d2;\r
+//extern crate r2d2_sqlite;\r
+//extern crate rusqlite;\r
\r
-fn create_or_update() {\r
+use r2d2_sqlite::SqliteConnectionManager;\r
+use r2d2::Pool;\r
\r
+#[derive(Debug)]\r
+pub enum DbError {\r
+ SqliteError(rusqlite::Error),\r
+ R2d2Error(r2d2::Error),\r
+ UnsupportedVersion(i32),\r
+}\r
+\r
+use super::consts;\r
+\r
+const CURRENT_DB_VERSION: u32 = 1;\r
+\r
+pub struct Connection {\r
+ //con: rusqlite::Connection\r
+ pool: Pool<SqliteConnectionManager>\r
+}\r
+\r
+pub struct Recipe {\r
+ pub title: String,\r
+ pub id: i32,\r
+}\r
+\r
+impl std::convert::From<rusqlite::Error> for DbError {\r
+ fn from(error: rusqlite::Error) -> Self {\r
+ DbError::SqliteError(error)\r
+ }\r
+}\r
+\r
+impl std::convert::From<r2d2::Error> for DbError {\r
+ fn from(error: r2d2::Error) -> Self {\r
+ DbError::R2d2Error(error)\r
+ }\r
+}\r
+\r
+impl Connection {\r
+ pub fn new() -> Result<Connection, DbError> {\r
+\r
+ let data_dir = Path::new(consts::DB_DIRECTORY);\r
+\r
+ if !data_dir.exists() {\r
+ fs::DirBuilder::new().create(data_dir).unwrap();\r
+ }\r
+\r
+ let manager = SqliteConnectionManager::file("file.db");\r
+ let pool = r2d2::Pool::new(manager).unwrap();\r
+\r
+ let connection = Connection { pool };\r
+ connection.create_or_update()?;\r
+ Ok(connection)\r
+ }\r
+\r
+ /*\r
+ * Called after the connection has been established for creating or updating the database.\r
+ * The 'Version' table tracks the current state of the database.\r
+ */\r
+ fn create_or_update(self: &Self) -> Result<(), DbError> {\r
+ // let connection = Connection::new();\r
+ // let mut stmt = connection.sqlite_con.prepare("SELECT * FROM versions ORDER BY date").unwrap();\r
+ // let mut stmt = connection.sqlite_con.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='versions'").unwrap();\r
+\r
+ // Check the Database version.\r
+ let mut con = self.pool.get()?;\r
+ let tx = con.transaction()?;\r
+\r
+ let mut version = {\r
+ match tx.query_row(\r
+ "SELECT [name] FROM [sqlite_master] WHERE [type] = 'table' AND [name] = 'Version'",\r
+ rusqlite::NO_PARAMS,\r
+ |row| row.get::<usize, String>(0)\r
+ ) {\r
+ Ok(_) => tx.query_row("SELECT [version] FROM [Version]", rusqlite::NO_PARAMS, |row| row.get(0)).unwrap_or_default(),\r
+ Err(_) => 0\r
+ }\r
+ };\r
+\r
+ while Connection::update_to_next_version(version, &tx)? {\r
+ version += 1;\r
+ }\r
+\r
+ tx.commit()?;\r
+\r
+ Ok(())\r
+ }\r
+\r
+ fn update_to_next_version(version: i32, tx: &rusqlite::Transaction) -> Result<bool, DbError> {\r
+ match version {\r
+ 0 => {\r
+ println!("Update to version 1...");\r
+\r
+ // Initial structure.\r
+ tx.execute_batch(\r
+ "\r
+ CREATE TABLE [Version] (\r
+ [id] INTEGER PRIMARY KEY,\r
+ [version] INTEGER NOT NULL UNIQUE,\r
+ [datetime] INTEGER DATETIME\r
+ );\r
+\r
+ CREATE TABLE [Recipe] (\r
+ [id] INTEGER PRIMARY KEY,\r
+ [title] INTEGER NOT NULL,\r
+ [description] INTEGER DATETIME\r
+ );\r
+ "\r
+ )?;\r
+\r
+ /*\r
+ tx.execute(\r
+ "\r
+ INSERT INTO Version\r
+ ",\r
+ rusqlite::NO_PARAMS\r
+ );*/\r
+\r
+ Ok(true)\r
+ }\r
+\r
+ // Current version.\r
+ 1 =>\r
+ Ok(false),\r
+\r
+ v =>\r
+ Err(DbError::UnsupportedVersion(v)),\r
+ }\r
+ }\r
+\r
+ pub fn get_all_recipes() {\r
+\r
+ }\r
}
\ No newline at end of file