solomax commented on code in PR #144:
URL: https://github.com/apache/openjpa/pull/144#discussion_r3449916024


##########
openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/jdbc/meta/TestJDBCSchemaManager.java:
##########
@@ -0,0 +1,143 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.openjpa.jdbc.meta;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.UUID;
+
+import org.apache.openjpa.jdbc.conf.JDBCConfiguration;
+import org.apache.openjpa.jdbc.sql.DBDictionary;
+import org.apache.openjpa.jdbc.sql.OracleDictionary;
+import org.apache.openjpa.persistence.OpenJPAEntityManagerFactorySPI;
+import org.apache.openjpa.persistence.OpenJPAEntityManagerSPI;
+import org.apache.openjpa.persistence.test.AbstractPersistenceTestCase;
+import org.junit.Test;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.SchemaValidationException;
+
+/**
+ * Test that a {@link MappingTool#ACTION_REFRESH} uses the right
+ * types for new columns and takes any mapping in DBDictionary into account.
+ */
+public class TestJDBCSchemaManager extends AbstractPersistenceTestCase {
+    /**
+     * First we create a schema mapping with boolean representation as CHAR(1).
+     * Then we create an entry.
+     * After that we create a diff from the entity to the current DB.
+     * This should result in an empty diff.
+     */
+    @Test
+    public void testSchemaReset() throws Exception {
+        EntityManagerFactory emf = createEMF(UUIDEntity.class, DROP_TABLES);
+        EntityManager em = emf.createEntityManager();
+
+        assertNotNull(em);
+
+        em.getTransaction().begin();
+        UUIDEntity ue1 = new UUIDEntity();
+        ue1.setValue("Something");
+        em.persist(ue1);
+
+        em.getTransaction().commit();
+        UUID id = ue1.getId();
+        closeEM(em);
+
+        EntityManager em2 = emf.createEntityManager();
+        assertNotNull(em2);
+
+        UUIDEntity ue2 = em2.find(UUIDEntity.class, id);
+        assertNotNull(ue2);
+        assertNotEquals(ue1, ue2);
+
+        closeEM(em2);
+
+        closeEMF(emf);
+    }
+
+    @Test
+    public void testBuildSchema() throws IOException, SQLException {
+        EntityManagerFactory emf = createEMF(UUIDEntity.class, 
EntityBoolChar.class, DROP_TABLES);
+        emf.createEntityManager();
+
+        emf.getSchemaManager().create(false);
+        emf.getSchemaManager().drop(false);
+    }
+
+    @Test
+    public void testTruncate() {
+        EntityManagerFactory emf = createEMF(UUIDEntity.class, 
EntityBoolChar.class, DROP_TABLES);
+        EntityManager em = emf.createEntityManager();
+
+        em.getTransaction().begin();
+        UUIDEntity ue1 = new UUIDEntity();
+        ue1.setValue("Something");
+        em.persist(ue1);
+
+        em.getTransaction().commit();
+        UUIDEntity ue2 = em.find(UUIDEntity.class, ue1.getId());
+        assertNotNull(ue2);
+
+        closeEM(em);
+
+        emf.getSchemaManager().truncate();
+
+        em = emf.createEntityManager();
+        assertNull(em.find(UUIDEntity.class, ue1.getId()));
+        closeEM(em);
+    }
+
+    @Test
+    public void testValidate() {
+        OpenJPAEntityManagerFactorySPI emf = createEMF(UUIDEntity.class, 
EntityBoolChar.class, DROP_TABLES);;
+        EntityManager em = emf.createEntityManager();
+
+        em.getTransaction().begin();
+        UUIDEntity ue1 = new UUIDEntity();
+        ue1.setValue("Something");
+        em.persist(ue1);
+        em.getTransaction().commit();
+
+        Connection conn = (Connection) ((OpenJPAEntityManagerSPI) 
em.getDelegate()).getConnection();
+
+        JDBCConfiguration conf = ((JDBCConfiguration) emf.getConfiguration());
+        DBDictionary dict = conf.getDBDictionaryInstance();
+
+        try (Statement stmt = conn.createStatement()) {
+            stmt.executeUpdate("ALTER TABLE UUIDEntity DROP COLUMN value_");
+            stmt.executeUpdate("ALTER TABLE UUIDEntity ADD " + (dict 
instanceof OracleDictionary ? "" : "COLUMN") + " value_ BOOLEAN DEFAULT FALSE");

Review Comment:
   > Meanwhile I'll start huge Oracle test (I'm afraid it will require days on 
my laptop :((( )
   
   My estimate might be too optimistic, due to:
   
   ```
   Time elapsed: 2165 s -- in 
org.apache.openjpa.jdbc.meta.TestMappingToolRefresh
   Time elapsed: 2840 s -- in org.apache.openjpa.jdbc.meta.TestJDBCSchemaManager
   Time elapsed: 1160 s -- in 
org.apache.openjpa.jdbc.kernel.TestNoForeignKeyViolation
   Time elapsed: 1461 s -- in 
org.apache.openjpa.persistence.spring.TestLibService
   Time elapsed: 1400 s -- in 
org.apache.openjpa.persistence.entitygraph.TestEntityGraph
   Time elapsed: 16295 s -- in 
org.apache.openjpa.persistence.criteria.TestTypecastAsCriteria
   Time elapsed: 34642 s -- in org.apache.openjpa.persistence.criteria.TestEdit
   Time elapsed: 75059 s -- in 
org.apache.openjpa.persistence.criteria.results.TestMultiselect
   Time elapsed: 5583 s -- in 
org.apache.openjpa.persistence.criteria.TestFetchJoin
   Time elapsed: 19513 s -- in 
org.apache.openjpa.persistence.criteria.TestQueryByExample
   Time elapsed: 78590 s -- in 
org.apache.openjpa.persistence.criteria.TestMetaModelTypesafeCriteria
   ```
   
   I'll keep you updated :)



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