Hibernate DDL created twice

In dev mode the hibernate DDL is eagerly created just in case is might
be needed in the dev UI. This fixes that, and also adds the ability to
view the update script which can be really useful to create flyway
migrations.

Fixes #38357

extensions/hibernate-orm/deployment/src/main/resources/dev-ui/hibernate-orm-persistence-units.js

@@ -83,6 +83,21 @@ export class HibernateOrmPersistenceUnitsComponent extends LitElement {
                     </vaadin-details-summary>
                     <pre class="ddl-script">${pu.createDDL}</pre>
                 </vaadin-details>
+                <vaadin-details>
+                    <vaadin-details-summary slot="summary" theme="filled">
+                        <vaadin-horizontal-layout
+                                theme="spacing"
+                                style="align-items: center;">
+                            <span>Update Script</span>
+                            <vaadin-button @click="${(e) => this._copyToClipboard(e, 'Update Script')}"
+                                    theme="small">
+                                <vaadin-icon icon="font-awesome-solid:clipboard"></vaadin-icon>
+                                Copy
+                            </vaadin-button>
+                        </vaadin-horizontal-layout>
+                    </vaadin-details-summary>
+                    <pre class="ddl-script">${pu.updateDDL}</pre>
+                </vaadin-details>
                 <vaadin-details>
                     <vaadin-details-summary slot="summary" theme="filled">
                         <vaadin-horizontal-layout
@@ -114,4 +129,4 @@ export class HibernateOrmPersistenceUnitsComponent extends LitElement {
     }
 
 }
-customElements.define('hibernate-orm-persistence-units', HibernateOrmPersistenceUnitsComponent);
+customElements.define('hibernate-orm-persistence-units', HibernateOrmPersistenceUnitsComponent);

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/dev/HibernateOrmDevController.java

@@ -7,6 +7,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Supplier;
 
 import org.hibernate.boot.Metadata;
 import org.hibernate.boot.query.NamedHqlQueryDefinition;
@@ -27,6 +28,7 @@
 import org.hibernate.tool.schema.spi.SchemaDropper;
 import org.hibernate.tool.schema.spi.SchemaManagementTool;
 import org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator;
+import org.hibernate.tool.schema.spi.SchemaMigrator;
 import org.hibernate.tool.schema.spi.ScriptSourceInput;
 import org.hibernate.tool.schema.spi.ScriptTargetOutput;
 import org.hibernate.tool.schema.spi.SourceDescriptor;
@@ -75,11 +77,32 @@ void pushPersistenceUnit(String persistenceUnitName,
             }
         }
 
-        String createDDL = generateDDL(Action.CREATE, metadata, serviceRegistry, importFile);
-        String dropDDL = generateDDL(Action.DROP, metadata, serviceRegistry, importFile);
+        DDLSupplier createDDLSupplier = new DDLSupplier(Action.CREATE, metadata, serviceRegistry, importFile);
+        DDLSupplier dropDDLSupplier = new DDLSupplier(Action.DROP, metadata, serviceRegistry, importFile);
+        DDLSupplier updateDDLSupplier = new DDLSupplier(Action.UPDATE, metadata, serviceRegistry, importFile);
 
         info.add(new HibernateOrmDevInfo.PersistenceUnit(persistenceUnitName, managedEntities,
-                namedQueries, namedNativeQueries, createDDL, dropDDL));
+                namedQueries, namedNativeQueries, createDDLSupplier, dropDDLSupplier, updateDDLSupplier));
+    }
+
+    class DDLSupplier implements Supplier<String> {
+
+        private final Action action;
+        private final Metadata metadata;
+        private final ServiceRegistry serviceRegistry;
+        private final String importFile;
+
+        DDLSupplier(Action action, Metadata metadata, ServiceRegistry serviceRegistry, String importFile) {
+            this.action = action;
+            this.metadata = metadata;
+            this.serviceRegistry = serviceRegistry;
+            this.importFile = importFile;
+        }
+
+        @Override
+        public String get() {
+            return generateDDL(action, metadata, serviceRegistry, importFile);
+        }
     }
 
     void clearData() {
@@ -131,8 +154,11 @@ public void accept(String command) {
                 SchemaDropper schemaDropper = tool.getSchemaDropper(executionOptions.getConfigurationValues());
                 schemaDropper.doDrop(metadata, executionOptions, ContributableMatcher.ALL, source, target);
             } else if (action == Action.CREATE) {
-                SchemaCreator schemaDropper = tool.getSchemaCreator(executionOptions.getConfigurationValues());
-                schemaDropper.doCreation(metadata, executionOptions, ContributableMatcher.ALL, source, target);
+                SchemaCreator schemaCreator = tool.getSchemaCreator(executionOptions.getConfigurationValues());
+                schemaCreator.doCreation(metadata, executionOptions, ContributableMatcher.ALL, source, target);
+            } else if (action == Action.UPDATE) {
+                SchemaMigrator schemaMigrator = tool.getSchemaMigrator(executionOptions.getConfigurationValues());
+                schemaMigrator.doMigration(metadata, executionOptions, ContributableMatcher.ALL, target);
             }
             return writer.toString();
         } catch (RuntimeException e) {

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/dev/HibernateOrmDevInfo.java

@@ -6,6 +6,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
+import java.util.function.Supplier;
 
 import org.hibernate.LockOptions;
 import org.hibernate.boot.query.NamedHqlQueryDefinition;
@@ -44,18 +45,24 @@ public static class PersistenceUnit {
         private final List<Entity> managedEntities;
         private final List<Query> namedQueries;
         private final List<Query> namedNativeQueries;
-        private final String createDDL;
-        private final String dropDDL;
+        private String createDDL;
+        private String dropDDL;
+        private String updateDDL;
+        private final Supplier<String> createDDLSupplier;
+        private final Supplier<String> dropDDLSupplier;
+        private final Supplier<String> updateDDLSupplier;
 
         public PersistenceUnit(String name, List<Entity> managedEntities,
                 List<Query> namedQueries,
-                List<Query> namedNativeQueries, String createDDL, String dropDDL) {
+                List<Query> namedNativeQueries, Supplier<String> createDDL, Supplier<String> dropDDL,
+                Supplier<String> updateDDLSupplier) {
             this.name = name;
             this.managedEntities = managedEntities;
             this.namedQueries = namedQueries;
             this.namedNativeQueries = namedNativeQueries;
-            this.createDDL = createDDL;
-            this.dropDDL = dropDDL;
+            this.createDDLSupplier = createDDL;
+            this.dropDDLSupplier = dropDDL;
+            this.updateDDLSupplier = updateDDLSupplier;
         }
 
         public String getName() {
@@ -81,14 +88,27 @@ public List<Query> getAllNamedQueries() {
             return allQueries;
         }
 
-        public String getCreateDDL() {
+        public synchronized String getCreateDDL() {
+            if (createDDL == null) {
+                createDDL = createDDLSupplier.get();
+            }
             return createDDL;
         }
 
-        public String getDropDDL() {
+        public synchronized String getDropDDL() {
+            if (dropDDL == null) {
+                dropDDL = dropDDLSupplier.get();
+            }
             return dropDDL;
         }
 
+        public synchronized String getUpdateDDL() {
+            if (updateDDL == null) {
+                updateDDL = updateDDLSupplier.get();
+            }
+            return updateDDL;
+        }
+
     }
 
     public static class Entity {