Fixes #97: SQLite is now async, optimized, tests

2022-10-21 10:00:43 +02:00
parent b9da9b7965
commit c1a78e0105
65 changed files with 329 additions and 142 deletions
@@ -0,0 +1,57 @@
+/**
+ * notes.ts
+ *
+ * A command line tool to manage a set
+ * of simple notes.
+ *
+ * This is an example, meant to illustrate using
+ * the API provided by deno-sqlite.
+ */
+
+import { DB } from "../mod.ts";
+
+const commands: Record<string, (...args: string[]) => Promise<void> | void> = {
+  "create": (file: string) => {
+    const db = new DB(file, { mode: "create" });
+    db.query(`
+      CREATE TABLE notes (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        note TEXT NOT NULL,
+        created_at TEXT NOT NULL
+      )
+    `);
+    db.close();
+    console.log("Database created!");
+  },
+  "record": (file: string, note: string) => {
+    const db = new DB(file, { mode: "write" });
+    db.query("INSERT INTO notes (note, created_at) VALUES (?, ?)", [
+      note,
+      new Date(),
+    ]);
+    db.close();
+    console.log("Note recorded!");
+  },
+  "delete": (file: string, noteId: string) => {
+    const db = new DB(file, { mode: "write" });
+    db.query("DELETE FROM notes WHERE id = ?", [noteId]);
+    db.close();
+    console.log("Note deleted!");
+  },
+  "list": (file: string) => {
+    const db = new DB(file, { mode: "read" });
+    const query = db.prepareQuery<[number, string, string]>(
+      "SELECT id, note, created_at FROM notes ORDER BY created_at DESC",
+    );
+    for (const [id, note, createdAt] of query.iter()) {
+      const date = new Date(createdAt);
+      console.log(`Note #${id} (recorded ${date.toLocaleString()})\n${note}\n`);
+    }
+    query.finalize();
+    db.close();
+  },
+};
+
+const command = commands[Deno.args[0]] ??
+  (() => console.error(`Unknown command '${Deno.args[0]}'.`));
+await command(...Deno.args.slice(1));