refactoring

backend-assemblyscript/step3-finished-app/assembly/model.ts

@@ -0,0 +1,35 @@
+import {query} from "../node_modules/db-connector/assembly/sqlite"
+
+export function createScheme(): void {
+    let request = `CREATE TABLE messages(msg text, username text)`;
+    query(request);
+}
+
+export function addMessage(msg: string, username: string): void {
+    let request = `INSERT INTO messages VALUES("` + msg + `", "` + username + `")`;
+    query(request);
+}
+
+export function getMessages(username: string | null): string {
+    if (username) {
+
+        let request =
+            `SELECT json_group_array(
+                json_object('msg', msg, 'username', username)
+            ) AS json_result FROM 
+                (SELECT * FROM messages WHERE username = "` + username + `")`;
+        return query(request);
+    } else {
+        let request =
+            `SELECT json_group_array(
+                json_object('msg', msg, 'username', username)
+            ) AS json_result FROM (SELECT * FROM messages)`;
+        return query(request);
+    }
+}
+
+export function getPostsCount(): u32 {
+    let request = `SELECT COUNT(*) from messages`;
+    let result = query(request);
+    return U32.parseInt(result);
+}