add db

src/model.rs

@@ -1,4 +1,5 @@
 //src/model.rs
+use rusqlite::{params, Connection, Result as SqlResult};
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -9,6 +10,38 @@ pub struct AiSystem {
     pub messaging: Messaging,
 }
 
+impl AiSystem {
+    pub fn save_to_db(&self, conn: &Connection) -> SqlResult<()> {
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS ai_state (id INTEGER PRIMARY KEY, json TEXT)",
+            [],
+        )?;
+
+        let json_data = serde_json::to_string(self).map_err(|e| {
+            rusqlite::Error::ToSqlConversionFailure(Box::new(e))
+        })?;
+
+        conn.execute(
+            "INSERT OR REPLACE INTO ai_state (id, json) VALUES (?1, ?2)",
+            params![1, json_data],
+        )?;
+
+        Ok(())
+    }
+
+    pub fn load_from_db(conn: &Connection) -> SqlResult<Self> {
+        let mut stmt = conn.prepare("SELECT json FROM ai_state WHERE id = ?1")?;
+        let json: String = stmt.query_row(params![1], |row| row.get(0))?;
+
+        // ここも serde_json のエラーを map_err で変換
+        let system: AiSystem = serde_json::from_str(&json).map_err(|e| {
+            rusqlite::Error::FromSqlConversionFailure(0, rusqlite::types::Type::Text, Box::new(e))
+        })?;
+
+        Ok(system)
+    }
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Personality {
     pub kind: String, // e.g., "positive", "negative", "neutral"
@@ -37,5 +70,3 @@ pub struct Messaging {
     pub decay_rate: f32,               // how quickly emotion fades (0.0 - 1.0)
     pub templates: Vec<String>,       // message template variations
 }
-
-