[BPe] Tratamento de eventos em contingência

bug#12843
dev:trevezani
qua:

git-svn-id: http://desenvolvimento.rjconsultores.com.br/repositorio/sco/BD/FlyWay/trunk@87763 d1611594-4594-4d17-8e1d-87c2c4800839

src/com/rjconsultores/ventaboletos/FlyWay.java

@@ -40,6 +40,10 @@ public class FlyWay {
 	
 	private String location = "db.migration";
 	
+	private FlyWay() {
+		
+	}
+	
 	public static FlyWay getInstance() {
 		return INSTANCE;
 	}

src/db/migration/V20181207_1510__mantis12843.sql

@@ -0,0 +1,7 @@
+declare
+    column_exists exception;
+    pragma exception_init (column_exists , -01430);
+begin
+    execute immediate 'ALTER TABLE BPE ADD (DHREFERENCIA VARCHAR2(25 BYTE))';
+    exception when column_exists then null;
+end;