Fix the exception after DB upload fails while keeping the context

src/app/output/status.rs

@@ -46,7 +46,7 @@ pub fn Status() -> impl IntoView {
                         "This shouldn't happen, please create an issue on github."
                     }
                     WorkerError::InvaildState => {
-                        "SQLite is in an abnormal state when executing SQLite."
+                        "SQLite is in an abnormal state when executing SQLite, please enable the discard context option and use it once."
                     }
                     WorkerError::LoadDb(_) => {
                         "Please check whether the imported DB is a SQLite3 file"

src/worker/mod.rs

@@ -167,7 +167,11 @@ pub async fn prepare(options: PrepareOptions) -> Result<()> {
             worker.db = Some(SQLiteDb::open(&worker.open_options.uri())?);
         }
 
-        let stmts = worker.db.as_ref().unwrap().prepare(&options.sql)?;
+        let stmts = worker
+            .db
+            .as_ref()
+            .ok_or(WorkerError::InvaildState)?
+            .prepare(&options.sql)?;
         worker.state = SQLiteState::Prepared(PreparedState {
             stmts,
             prepared: None,