Add usingConnection() to DtoQuery and SqlQuery

For the case where we have a java.sql.Connection and wish
to execute a DtoQuery or SqlQuery using that connection.

ebean-core/src/main/java/io/ebeaninternal/server/querydefn/DefaultDtoQuery.java

@@ -9,8 +9,10 @@ import io.ebeaninternal.api.*;
 import io.ebeaninternal.server.dto.DtoBeanDescriptor;
 import io.ebeaninternal.server.dto.DtoMappingRequest;
 import io.ebeaninternal.server.dto.DtoQueryPlan;
+import io.ebeaninternal.server.transaction.ExternalJdbcTransaction;
 
 import javax.annotation.Nullable;
+import java.sql.Connection;
 import java.util.Collection;
 import java.util.List;
 import java.util.Optional;
@@ -86,6 +88,12 @@ public final class DefaultDtoQuery<T> extends AbstractQuery implements SpiDtoQue
     return this;
   }
 
+  @Override
+  public DtoQuery<T> usingConnection(Connection connection) {
+    this.transaction = new ExternalJdbcTransaction(connection);
+    return this;
+  }
+
   @Override
   public DtoQuery<T> usingMaster() {
     this.useMaster = true;

ebean-core/src/main/java/io/ebeaninternal/server/querydefn/DefaultRelationalQuery.java

@@ -7,7 +7,9 @@ import io.ebeaninternal.api.BindParams;
 import io.ebeaninternal.api.SpiEbeanServer;
 import io.ebeaninternal.api.SpiSqlQuery;
 import io.ebeaninternal.api.SpiTransaction;
+import io.ebeaninternal.server.transaction.ExternalJdbcTransaction;
 
+import java.sql.Connection;
 import java.util.List;
 import java.util.Optional;
 import java.util.function.Consumer;
@@ -50,6 +52,12 @@ public final class DefaultRelationalQuery extends AbstractQuery implements SpiSq
     return this;
   }
 
+  @Override
+  public SqlQuery usingConnection(Connection connection) {
+    this.transaction = new ExternalJdbcTransaction(connection);
+    return this;
+  }
+
   @Override
   public SqlQuery usingMaster() {
     this.useMaster = true;