JAVA-19787 : Adding example for h2 default sql schema and data initialization (#13863)

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/dataloading/ApplicationDataLoading.java

@@ -0,0 +1,20 @@
+package com.baeldung.dataloading;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.core.env.AbstractEnvironment;
+
+import com.baeldung.boot.Application;
+
+@SpringBootApplication(scanBasePackages = { "com.baeldung.dataloading" })
+public class ApplicationDataLoading {
+    private static ApplicationContext applicationContext;
+
+    public static void main(String[] args) {
+        System.setProperty(AbstractEnvironment.ACTIVE_PROFILES_PROPERTY_NAME, "datasource");
+
+        applicationContext = SpringApplication.run(Application.class, args);
+    }
+
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/dataloading/model/User.java

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+package com.baeldung.dataloading.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+    @Id
+    @GeneratedValue
+    private Integer id;
+    private String name;
+    private Integer status;
+
+    public User() {
+    }
+
+    public User(String name, Integer status) {
+        this.name = name;
+        this.status = status;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getStatus() {
+        return status;
+    }
+
+    public void setStatus(Integer status) {
+        this.status = status;
+    }
+}

persistence-modules/spring-boot-persistence/src/main/resources/application-datasource.properties

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+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.hibernate.ddl-auto=none
+# Enabling H2 Console
+spring.h2.console.enabled=true
+# Uppercase Table Names
+spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
+hibernate.globally_quoted_identifiers=true
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect