Catch database errors and prevent them from crashing the app

lib/DatabaseConnectionPool.js

@@ -98,11 +98,20 @@ class DatabaseConnectionPool {
 		const prepared = sql.includes('?');
 
 		let data;
-		if (!prepared) {
+		try {
-			[ data ] = await this.#connectionPool.execute(sql);
+			if (!prepared) {
-		} else {
+				[ data ] = await this.#connectionPool.execute(
-			[ data ] =
+					sql
-				await this.#connectionPool.execute(sql, params);
+				);
+			} else {
+				[ data ] = await this.#connectionPool.execute(
+					sql,
+					params
+				);
+			}
+		} catch (e) {
+			console.error(e);
+			data = [];
 		}
 
 		return data;

lib/PasswordReset.js

@@ -72,9 +72,7 @@ class PasswordReset {
 			where userId = ?;
 		`;
 
-		await conn.runQuery(sql, [ u.id ]);
+		let result = await conn.runQuery(sql, [ u.id ]);
-
-		conn.close();
 
 		const [ nonce, token ] = await PasswordReset.hashToken(u);
 
@@ -93,13 +91,18 @@ class PasswordReset {
 			values (?, ?, ?, FROM_UNIXTIME(?));
 		`;
 
-		await conn.runQuery(sql, [
+		result = await conn.runQuery(sql, [
 			u.id,
 			token,
 			nonce,
 			expires
 		]);
 
+		if (!result)
+			throw new Error('Could not create password reset');
+
+		conn.close();
+
 		return new PasswordReset(u.id, token);
 	}
 }

lib/TestTemplate.js

@@ -99,13 +99,18 @@ class TestTemplate {
 
 		const conn = await new DatabaseConnectionPool();
 
-		await conn.runQuery(sql, [
+		const result = await conn.runQuery(sql, [
 			id,
 			this.id,
 			c.id,
 			epochDate
 		]);
 
+		conn.close();
+
+		if (!result.length)
+			throw new Error('Could not assign class');
+
 		return new Test(id);
 	}
 
@@ -130,13 +135,18 @@ class TestTemplate {
 				(?, ?, ?, ?);
 		`;
 
-		await conn.runQuery(sql, [
+		const result = await conn.runQuery(sql, [
 			id,
 			a.id,
 			name,
 			maxMark
 		]);
 
+		conn.close();
+
+		if (!result)
+			throw new Error('Could not create test template');
+
 		return new TestTemplate(id);
 	}
 }

lib/User.js

@@ -94,6 +94,8 @@ class User {
 
 				return new (require(`./${className}`))(this.id);
 			}
+
+			throw new Error('No user found');
 		})();
 	}