Re-organise mysql scripts so the app runs without root access

It works better that way with test containers and in k8s.

docker-compose.yml

@@ -3,7 +3,10 @@ mysql:
   ports:
     - "3306:3306"
   environment:
-    - MYSQL_ROOT_PASSWORD=petclinic
+    - MYSQL_ROOT_PASSWORD=
+    - MYSQL_ALLOW_EMPTY_PASSWORD=true
+    - MYSQL_USER=petclinic
+    - MYSQL_PASSWORD=petclinic
     - MYSQL_DATABASE=petclinic
   volumes:
     - "./conf.d:/etc/mysql/conf.d:ro"

src/main/resources/application-mysql.properties

@@ -1,7 +1,7 @@
 # database init, supports mysql too
 database=mysql
 spring.datasource.url=jdbc:mysql://localhost/petclinic
-spring.datasource.username=root
+spring.datasource.username=petclinic
 spring.datasource.password=petclinic
 # SQL is written to be idempotent so this is safe
 spring.datasource.initialization-mode=always

src/main/resources/db/mysql/petclinic_db_setup_mysql.txt

@@ -18,12 +18,14 @@
         mysql_1_eedb4818d817 | MySQL init process done. Ready for start up.
         ...
 
-2) Create the PetClinic database and user by executing the "db/mysql/{schema,data}.sql"
+2) (Once only) create the PetClinic database and user by executing the "db/mysql/user.sql"
-   scripts (or set "spring.datasource.initialization-mode=always" the first time you run the app).
+   scripts. You can connect to the database running in the docker container using 
+   `mysql -u root -h localhost --protocol tcp`, but you don't need to run the script there
+   because the petclinic user is already set up if you use the provided `docker-compose.yaml`.
 
 3) Run the app with `spring.profiles.active=mysql` (e.g. as a System property via the command
    line, but any way that sets that property in a Spring Boot app should work).
 
 N.B. the "petclinic" database has to exist for the app to work with the JDBC URL value
 as it is configured by default. This condition is taken care of by the docker-compose
-configuration provided, or by the `schema.sql` if you can run that as root.
+configuration provided, or by the `schema.sql` if you can run that as root.

src/main/resources/db/mysql/schema.sql

@@ -1,13 +1,3 @@
-CREATE DATABASE IF NOT EXISTS petclinic;
-
-ALTER DATABASE petclinic
-  DEFAULT CHARACTER SET utf8
-  DEFAULT COLLATE utf8_general_ci;
-
-GRANT ALL PRIVILEGES ON petclinic.* TO pc@localhost IDENTIFIED BY 'pc';
-
-USE petclinic;
-
 CREATE TABLE IF NOT EXISTS vets (
   id INT(4) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
   first_name VARCHAR(30),

src/main/resources/db/mysql/user.sql

@@ -0,0 +1,7 @@
+CREATE DATABASE IF NOT EXISTS petclinic;
+
+ALTER DATABASE petclinic
+  DEFAULT CHARACTER SET utf8
+  DEFAULT COLLATE utf8_general_ci;
+
+GRANT ALL PRIVILEGES ON petclinic.* TO 'petclinic@%' IDENTIFIED BY 'petclinic';