Add converter for DateTime (#346)

* Add converter for DateTime

* Added to sql integration test suite

* Removed obsolete "auto update schema" property

core/src/main/java/google/registry/persistence/DateTimeConverter.java

@@ -0,0 +1,41 @@
+// Copyright 2019 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed 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 google.registry.persistence;
+
+import static org.joda.time.DateTimeZone.UTC;
+
+import java.sql.Timestamp;
+import javax.annotation.Nullable;
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+import org.joda.time.DateTime;
+
+/** JPA converter to for storing/retrieving {@link org.joda.time.DateTime} objects. */
+@Converter(autoApply = true)
+public class DateTimeConverter implements AttributeConverter<DateTime, Timestamp> {
+
+  @Override
+  @Nullable
+  public Timestamp convertToDatabaseColumn(@Nullable DateTime attribute) {
+    return attribute == null ? null : new Timestamp(attribute.getMillis());
+  }
+
+  @Override
+  @Nullable
+  public DateTime convertToEntityAttribute(@Nullable Timestamp dbData) {
+    DateTime result = dbData == null ? null : new DateTime(dbData.getTime(), UTC);
+    return result;
+  }
+}

core/src/main/resources/META-INF/persistence.xml

@@ -36,6 +36,7 @@
     <class>google.registry.persistence.BloomFilterConverter</class>
     <class>google.registry.persistence.CreateAutoTimestampConverter</class>
     <class>google.registry.persistence.CurrencyUnitConverter</class>
+    <class>google.registry.persistence.DateTimeConverter</class>
     <class>google.registry.persistence.UpdateAutoTimestampConverter</class>
     <class>google.registry.persistence.ZonedDateTimeConverter</class>