Implement working database

src/database.rs

@@ -6,6 +6,7 @@ use rusqlite::{Connection, Result, params};
 
 pub struct Database {
     conn: Connection,
+    pub last_word_id: i64,
 }
 
 #[derive(From, Debug)]
@@ -28,17 +29,27 @@ impl Database {
         conn.execute(
             "CREATE TABLE IF NOT EXISTS word (
                 id        INTEGER PRIMARY KEY,
-                word      TEXT, reading   TEXT,
-                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
+                word      TEXT,
+                reading   TEXT,
+                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
             )",
             params![],
         )?;
-        Ok(Self { conn })
+        let last_word_id = match conn
+            .prepare("SELECT id FROM word ORDER BY id DESC LIMIT 1")?
+            .query_map(params![], |row| row.get(0))?
+            .collect::<Result<Vec<i64>>>()?
+            .first() {
+                Some(id) => *id,
+                None => 0, // first database entry is id 1
+            };
+        Ok(Self { conn, last_word_id })
     }
 
     pub fn load_words_before(&self, before_id: i64) -> Result<Vec<Word>> {
+        println!("{}", before_id);
         self.conn
-            .prepare("SELECT id, word, reading, timestamp FROM word WHERE id < ? DESC LIMIT 10")?
+            .prepare("SELECT id, word, reading, timestamp FROM word WHERE id < ? ORDER BY id DESC LIMIT 10")?
             .query_map(params![before_id], |row| {
                 Ok(Word {
                     id: row.get(0)?,
@@ -49,4 +60,16 @@ impl Database {
             })?
             .collect::<Result<Vec<Word>>>()
     }
+
+    pub fn add_word(&mut self, word: &Word) -> Result<()> {
+        self.conn.execute(
+            "INSERT INTO word (word, reading) VALUES (?1, ?2)",
+            params![
+                word.word,
+                word.reading,
+            ],
+        )?;
+        self.last_word_id += 1;
+        Ok(())
+    }
 }