HHH-17943 - Fix for issue

hibernate-core/src/main/java/org/hibernate/dialect/H2Dialect.java

@@ -688,6 +688,11 @@ public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(
 		);
 	}
 
+	@Override
+	public String getTemporaryTableCreateOptions() {
+		return "TRANSACTIONAL";
+	}
+
 	@Override
 	public TemporaryTableKind getSupportedTemporaryTableKind() {
 		return TemporaryTableKind.LOCAL;

hibernate-core/src/test/java/org/hibernate/orm/test/dialect/unit/H2DialectTempTableNoCommitTest.java

@@ -0,0 +1,113 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.dialect.unit;
+
+import org.hibernate.dialect.H2Dialect;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.RequiresDialect;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Inheritance;
+import jakarta.persistence.InheritanceType;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * @author Jan Schatteman
+ */
+@DomainModel(
+		annotatedClasses = {
+				H2DialectTempTableNoCommitTest.Person.class,
+				H2DialectTempTableNoCommitTest.Engineer.class,
+				H2DialectTempTableNoCommitTest.Doctor.class
+		}
+)
+@SessionFactory
+@RequiresDialect( H2Dialect.class )
+@JiraKey( "HHH-17943" )
+public class H2DialectTempTableNoCommitTest {
+
+	@Test
+	public void noCommitAfterTempTableCreationTest(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					// the following shouldn't commit anything to the DB
+					Doctor d = new Doctor();
+					d.setId( 2L );
+					session.persist( d );
+					session.flush();
+					session.createMutationQuery( "update Engineer set fellow = false where fellow = true" ).executeUpdate();
+					session.getTransaction().markRollbackOnly();
+				}
+		);
+		scope.inTransaction(
+				session -> {
+					assertNull(session.find( Doctor.class, 2L ));
+				}
+		);
+	}
+
+	@Entity(name = "Person")
+	@Inheritance(strategy = InheritanceType.JOINED)
+	public static class Person {
+
+		@Id
+		private Long id;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+	}
+
+	@Entity(name = "Engineer")
+	public static class Engineer extends Person {
+
+		private boolean fellow;
+
+		public boolean isFellow() {
+			return fellow;
+		}
+
+		public void setFellow(boolean fellow) {
+			this.fellow = fellow;
+		}
+	}
+
+	@Entity(name = "Doctor")
+	public static class Doctor {
+		@Id
+		private Long id;
+		private String name;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+}