ebean/ebean-test/src/test/java/org/tests/persistencecontext/TestPersistenceContextQueryScope.java

package org.tests.persistencecontext;

import io.ebean.BaseTestCase;
import io.ebean.DB;
import org.junit.jupiter.api.Test;
import org.tests.model.basic.EBasicVer;

import static io.ebean.PersistenceContextScope.QUERY;
import static io.ebean.PersistenceContextScope.TRANSACTION;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertSame;


public class TestPersistenceContextQueryScope extends BaseTestCase {

  @Test
  public void test() {

    EBasicVer bean = new EBasicVer("first");
    DB.save(bean);

    //DB.cacheManager().setCaching(EBasicVer.class, true);

    DB.beginTransaction();
    try {
      EBasicVer bean1 = DB.find(EBasicVer.class, bean.getId());

      // do an update of the name in the DB
      int rowCount = DB.sqlUpdate("update e_basicver set name=? where id=?")
        .setParameter("second")
        .setParameter(bean.getId())
        .execute();

      assertEquals(1, rowCount);

      // fetch the bean again... but doesn't hit DB as it
      // is in the PersistenceContext which is transaction scoped
      EBasicVer bean2 = DB.find(EBasicVer.class)
        .setId(bean.getId())
        .setUseCache(false) // ignore L2 cache
        .findOne();

      // QUERY scope hits the DB (doesn't use the existing transactions persistence context)
      // ... also explicitly not use bean cache
      EBasicVer bean3 = DB.find(EBasicVer.class)
        .setId(bean.getId())
        .setUseCache(false) // ignore L2 cache
        .setPersistenceContextScope(QUERY)
        .findOne();

      // TRANsACTION scope ... same as bean2 and does not hit the DB
      EBasicVer bean5 = DB.find(EBasicVer.class)
        .setId(bean.getId())
        .setUseCache(false) // ignore L2 cache
        .setPersistenceContextScope(TRANSACTION)
        .findOne();

      assertEquals("first", bean.getName());
      assertEquals("first", bean1.getName());
      assertEquals("first", bean2.getName());
      assertEquals("first", bean5.getName());
      assertSame(bean1, bean2);
      assertSame(bean1, bean5);

      assertEquals("second", bean3.getName());
      DB.delete(bean3);

      DB.commitTransaction();

    } finally {
      DB.endTransaction();
    }
  }
}