Add support to retrieve Rows from statement

Rows statement method executes statements over db connection/transaction and returns Rows.

tests/postgres/raw_statements_test.go

@@ -1,7 +1,9 @@
 package postgres
 
 import (
+	"context"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 
@@ -136,3 +138,42 @@ RETURNING link.id AS "link.id",
 	require.Equal(t, links[2].Name, "Google")
 	require.Nil(t, links[2].Description)
 }
+
+func TestRawStatementRows(t *testing.T) {
+	stmt := RawStatement(`
+		SELECT actor.actor_id AS "actor.actor_id",
+			 actor.first_name AS "actor.first_name",
+			 actor.last_name AS "actor.last_name",
+			 actor.last_update AS "actor.last_update"
+		FROM dvds.actor
+		ORDER BY actor.actor_id`)
+
+	rows, err := stmt.Rows(context.Background(), db)
+	require.NoError(t, err)
+
+	for rows.Next() {
+		var actor model.Actor
+		err := rows.Scan(&actor)
+		require.NoError(t, err)
+
+		require.NotEqual(t, actor.ActorID, int32(0))
+		require.NotEqual(t, actor.FirstName, "")
+		require.NotEqual(t, actor.LastName, "")
+		require.NotEqual(t, actor.LastUpdate, time.Time{})
+
+		if actor.ActorID == 54 {
+			require.Equal(t, actor.ActorID, int32(54))
+			require.Equal(t, actor.FirstName, "Penelope")
+			require.Equal(t, actor.LastName, "Pinkett")
+			require.Equal(t, actor.LastUpdate.Format(time.RFC3339), "2013-05-26T14:47:57Z")
+		}
+	}
+
+	err = rows.Close()
+	require.NoError(t, err)
+
+	err = rows.Err()
+	require.NoError(t, err)
+
+	requireLogged(t, stmt)
+}