Calculate entity property at INSERT or UPDATE time

Author: AnghelLeonard

HibernateSpringBootCalculatePropertyGenerated/src/main/java/com/bookstore/entity/Book.java

@@ -26,8 +26,7 @@ public class Book implements Serializable {
     // @Column(name="...", insertable=false)
 
     @Generated(value = GenerationTime.ALWAYS)
-    @Column(insertable = false, updatable = false, 
-            columnDefinition = "double AS (price - price * 0.25)")
+    @Column(insertable = false, updatable = false /*, columnDefinition = "double AS (price - price * 0.25)"*/ )
     private double discount;
 
     public Long getId() {
@@ -64,11 +63,7 @@ public void setPrice(double price) {
 
     public double getDiscount() {
         return discount;
-    }
-
-    public void setDiscount(double discount) {
-        this.discount = discount;
-    }
+    }   
 
     @Override
     public String toString() {

HibernateSpringBootCalculatePropertyGenerated/src/main/resources/application.properties

@@ -2,12 +2,14 @@ spring.datasource.url=jdbc:mysql://localhost:3306/bookstoredb?createDatabaseIfNo
 spring.datasource.username=root
 spring.datasource.password=root
 
-spring.jpa.hibernate.ddl-auto=create
+#if you want to rely on columnDefinition then uncomment the following line
+#spring.jpa.hibernate.ddl-auto=create
+
 spring.jpa.show-sql=true
 
 spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
 
 spring.jpa.open-in-view=false
 
-#spring.datasource.initialization-mode=always
-#spring.datasource.platform=mysql
+spring.datasource.initialization-mode=always
+spring.datasource.platform=mysql

HibernateSpringBootCalculatePropertyGenerated/src/main/resources/schema-mysql.sql

@@ -1,12 +1,12 @@
 -- Drop
-DROP TABLE IF EXISTS `bookstoredb`.`book`;
+DROP TABLE IF EXISTS bookstoredb.book;
 
 -- Create
-CREATE TABLE `book` (
-  `id` bigint(20) NOT NULL AUTO_INCREMENT,
-  `discount` double GENERATED ALWAYS AS ((`price` - (`price` * 0.25))) VIRTUAL,
-  `isbn` varchar(255) DEFAULT NULL,
-  `price` double NOT NULL,
-  `title` varchar(255) DEFAULT NULL,
-  PRIMARY KEY (`id`)
-) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+CREATE TABLE book (
+  id BIGINT NOT NULL AUTO_INCREMENT,
+  discount DOUBLE GENERATED ALWAYS AS ((`price` - (`price` * 0.25))) STORED,
+  isbn VARCHAR(255),
+  price DOUBLE PRECISION NOT NULL,
+  title VARCHAR(255),
+  PRIMARY KEY (id)
+)