add default roles on startup

Author: callicoder

Readme.md

@@ -51,13 +51,13 @@ I've written a complete tutorial series for this application on The CalliCoder B
 	mvn package
 	java -jar target/polls-0.0.1-SNAPSHOT.jar
 	```
-5. **Add the default Roles**
+5. **Default Roles**
 
-	The spring boot app uses role based authorization powered by spring security. Please execute the following sql queries in the database to insert the `USER` and `ADMIN` roles.
+	The spring boot app uses role based authorization powered by spring security. To add the default roles in the database, I have added the following script in `src/main/resources/data.sql` file. Spring boot will automatically execute this script on startup -
 
 	```sql
-	INSERT INTO roles(name) VALUES('ROLE_USER');
-	INSERT INTO roles(name) VALUES('ROLE_ADMIN');
+	INSERT IGNORE INTO roles(name) VALUES('ROLE_USER');
+	INSERT IGNORE INTO roles(name) VALUES('ROLE_ADMIN');
 	```
 
 	Any new user who signs up to the app is assigned the `ROLE_USER` by default.

polling-app-server/src/main/resources/application.properties

@@ -16,6 +16,9 @@ spring.jpa.hibernate.ddl-auto = update
 ## Hibernate Logging
 logging.level.org.hibernate.SQL= DEBUG
 
+# Initialize the datasource with available DDL and DML scripts
+spring.datasource.initialization-mode=always
+
 ## Jackson Properties
 spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS= false
 spring.jackson.time-zone= UTC

polling-app-server/src/main/resources/data.sql

@@ -0,0 +1,2 @@
+INSERT IGNORE INTO roles(name) VALUES('ROLE_USER');
+INSERT IGNORE INTO roles(name) VALUES('ROLE_ADMIN');

polling-app-server/src/main/resources/db/migration/V1__schema.sql

@@ -4,8 +4,8 @@ CREATE TABLE `users` (
   `username` varchar(15) NOT NULL,
   `email` varchar(40) NOT NULL,
   `password` varchar(100) NOT NULL,
-  `created_at` datetime DEFAULT NULL,
-  `updated_at` datetime DEFAULT NULL,
+  `created_at` timestamp DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` timestamp DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`),
   UNIQUE KEY `uk_users_username` (`username`),
   UNIQUE KEY `uk_users_email` (`email`)
@@ -34,8 +34,8 @@ CREATE TABLE `polls` (
   `id` bigint(20) NOT NULL AUTO_INCREMENT,
   `question` varchar(140) NOT NULL,
   `expiration_date_time` datetime NOT NULL,
-  `created_at` datetime DEFAULT NULL,
-  `updated_at` datetime DEFAULT NULL,
+  `created_at` timestamp DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` timestamp DEFAULT CURRENT_TIMESTAMP,
   `created_by` bigint(20) DEFAULT NULL,
   `updated_by` bigint(20) DEFAULT NULL,
   PRIMARY KEY (`id`)
@@ -57,8 +57,8 @@ CREATE TABLE `votes` (
   `user_id` bigint(20) NOT NULL,
   `poll_id` bigint(20) NOT NULL,
   `choice_id` bigint(20) NOT NULL,
-  `created_at` datetime DEFAULT NULL,
-  `updated_at` datetime DEFAULT NULL,
+  `created_at` timestamp DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` timestamp DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`),
   KEY `fk_votes_user_id` (`user_id`),
   KEY `fk_votes_poll_id` (`poll_id`),