Document how to use Flyway in reactive applications

docs/src/main/asciidoc/datasource.adoc

@@ -177,6 +177,7 @@ Until now, the configuration has been the same regardless of whether you are usi
 When you have defined the database kind and the credentials, the rest depends on what type of driver you are using.
 It is possible to use JDBC and a reactive driver simultaneously.
 
+[[jdbc-datasource]]
 ==== JDBC datasource
 
 JDBC is the most common database connection pattern, typically needed when used in combination with non-reactive Hibernate ORM.
@@ -294,6 +295,7 @@ AgroalDataSource defaultDataSource;
 In the above example, the type is `AgroalDataSource`, a `javax.sql.DataSource` subtype.
 Because of this, you can also use `javax.sql.DataSource` as the injected type.
 
+[[reactive-datasource]]
 ==== Reactive datasource
 
 Quarkus offers several reactive clients for use with a reactive datasource.
@@ -325,10 +327,22 @@ Be aware that setting the pool size too low might cause some requests to time ou
 
 For more information about pool size adjustment properties, see the <<reactive-configuration>> section.
 
+[[jdbc-and-reactive-datasources-simultaneously]]
 ==== JDBC and reactive datasources simultaneously
 
 When a JDBC extension - along with Agroal - and a reactive datasource extension handling the given database kind are included, they will both be created by default.
 
+If you want to use them both,
+make sure to set both <<jdbc-datasource,JDBC>> and <<reactive-datasource,reactive>> configuration,
+for example:
+
+[source,properties]
+----
+%prod.quarkus.datasource.reactive.url=postgresql:///your_database
+%prod.quarkus.datasource.jdbc.url=jdbc:postgresql://localhost:5432/hibernate_orm_test
+----
+
+If you do not want to have both a JDBC datasource and a reactive datasource created, use the following configuration.
 * To disable the JDBC datasource explicitly:
 +
 [source, properties]

docs/src/main/asciidoc/flyway.adoc

@@ -285,6 +285,23 @@ When using Flyway together with Hibernate ORM, you can use the Dev UI to generat
 
 You can find more information about this feature in the xref:hibernate-orm.adoc#flyway[Hibernate ORM guide].
 
+[[reactive-datasources]]
+== Flyway and Reactive datasources
+
+Flyway internally relies on a JDBC datasource,
+whereas reactive use cases will rely on xref:reactive-sql-clients.adoc[reactive SQL clients],
+either directly or through xref:hibernate-reactive.adoc[Hibernate Reactive].
+This is not a problem in Quarkus,
+because xref:datasource.adoc#jdbc-and-reactive-datasources-simultaneously[a single configured datasource can be made available both through reactive clients and JDBC].
+
+To use Flyway on a datasource you otherwise access reactively,
+simply make sure to configure that datasource
+both as xref:datasource.adoc#jdbc-datasource[JDBC]
+and xref:datasource.adoc#reactive-datasource[reactive].
+This involves in particular adding dependencies to Quarkus extensions
+for both the JDBC driver and the reactive client,
+for instance `quarkus-jdbc-postgresql` *and* `quarkus-reactive-pg-client`.
+
 == Flyway on Kubernetes
 Sometimes, it's helpful not to execute Flyway initialization on each application startup. One such example is when deploying
 

docs/src/main/asciidoc/hibernate-reactive.adoc

@@ -224,6 +224,22 @@ This will inject the `Mutiny.SessionFactory` of the default persistence unit.
 
 NOTE: Prior to Quarkus 3.0 it was also possible to inject a `@RequestScoped` bean for `Mutiny.Session`. However, the lifecycle of a reactive session does not fit the lifecycle of the CDI request context. Therefore, this bean is removed in Quarkus 3.0.
 
+[[flyway]]
+== Automatically transitioning to Flyway to Manage Schemas
+
+Hibernate Reactive can be used in the same application as Flyway.
+See xref:flyway.adoc#reactive-datasources[this section of the Flyway extension documentation]
+for details regarding configuration of Flyway in a reactive application.
+
+[TIP]
+====
+If you have the xref:flyway.adoc[Flyway extension] installed when running in development mode,
+Quarkus provides a simple way to initialize your Flyway configuration
+using the schema generated automatically by Hibernate Reactive.
+
+See xref:hibernate-orm.adoc#flyway[the Hibernate ORM guide] for more details.
+====
+
 [[testing]]
 === Testing
 

integration-tests/hibernate-reactive-mysql-agroal-flyway/src/main/java/io/quarkus/it/hibernate/reactive/mysql/HibernateReactiveMySQLTestEndpoint.java

@@ -9,7 +9,6 @@
 import org.hibernate.reactive.mutiny.Mutiny;
 
 import io.agroal.api.AgroalDataSource;
-import io.quarkus.agroal.DataSource;
 import io.smallrye.mutiny.Uni;
 import io.vertx.mutiny.mysqlclient.MySQLPool;
 import io.vertx.mutiny.sqlclient.Row;
@@ -28,15 +27,14 @@ public class HibernateReactiveMySQLTestEndpoint {
     MySQLPool mysqlPool;
 
     @Inject
-    @DataSource("blocking")
-    AgroalDataSource blockingDS;
+    AgroalDataSource jdbcDataSource;
 
     @GET
-    @Path("/blockingFind")
-    public GuineaPig blockingFind() throws SQLException {
+    @Path("/jdbcFind")
+    public GuineaPig jdbcFind() throws SQLException {
         final GuineaPig expectedPig = new GuineaPig(6, "Iola");
-        populateDBBlocking();
-        return selectBlocking(6);
+        populateDBJdbc();
+        return selectJdbc(6);
     }
 
     @GET
@@ -102,8 +100,8 @@ private Uni<RowSet<Row>> populateDB() {
                 .flatMap(junk -> mysqlPool.preparedQuery("INSERT INTO Pig (id, name) VALUES (5, 'Aloi')").execute());
     }
 
-    private void populateDBBlocking() throws SQLException {
-        Connection connection = blockingDS.getConnection();
+    private void populateDBJdbc() throws SQLException {
+        Connection connection = jdbcDataSource.getConnection();
         connection.prepareStatement("DELETE FROM Pig").execute();
         connection.prepareStatement("INSERT INTO Pig (id, name) VALUES (6, 'Iola')").execute();
         connection.close();
@@ -121,8 +119,8 @@ private Uni<String> selectNameFromId(Integer id) {
         });
     }
 
-    private GuineaPig selectBlocking(Integer id) throws SQLException {
-        Connection connection = blockingDS.getConnection();
+    private GuineaPig selectJdbc(Integer id) throws SQLException {
+        Connection connection = jdbcDataSource.getConnection();
         PreparedStatement statement = connection.prepareStatement("SELECT id, name FROM Pig WHERE id = ?");
         statement.setInt(1, id);
         ResultSet rowSet = statement.executeQuery();

integration-tests/hibernate-reactive-mysql-agroal-flyway/src/main/resources/application.properties

@@ -1,21 +1,15 @@
-# Reactive datasource config
+# Reactive+JDBC datasource config
 quarkus.datasource.db-kind=mysql
 quarkus.datasource.username=hibernate_orm_test
 quarkus.datasource.password=hibernate_orm_test
 quarkus.datasource.reactive.url=${reactive-mysql.url}
-
-# Blocking datasource config
-quarkus.datasource.blocking.db-kind=mysql
-quarkus.datasource.blocking.username=hibernate_orm_test
-quarkus.datasource.blocking.password=hibernate_orm_test
-quarkus.datasource.blocking.jdbc.url=${mysql.jdbc.url}
-quarkus.datasource.blocking.jdbc=true
-quarkus.datasource.blocking.jdbc.max-size=1
+quarkus.datasource.jdbc.url=${mysql.jdbc.url}
+quarkus.datasource.jdbc.max-size=1
 
 # Hibernate config
 #quarkus.hibernate-orm.log.sql=true
 # We'll use Flyway
 quarkus.hibernate-orm.database.generation=none
 
 # Check that one can use Flyway alongside Hibernate Reactive
-quarkus.flyway.blocking.migrate-at-start=true
+quarkus.flyway.migrate-at-start=true

integration-tests/hibernate-reactive-mysql-agroal-flyway/src/test/java/io/quarkus/it/hibernate/reactive/mysql/HibernateReactiveMySQLTest.java

@@ -22,9 +22,9 @@ public void reactiveFindMutiny() {
     }
 
     @Test
-    public void blockingFind() {
+    public void jdbcFind() {
         RestAssured.when()
-                .get("/tests/blockingFind")
+                .get("/tests/jdbcFind")
                 .then()
                 .body(is("{\"id\":6,\"name\":\"Iola\"}"));
     }