데이터소스가 오라클인 경우에도 SQL을 사용한 커넥션 확인 기능 추가

src/main/java/com/bsmlab/dfx/agent/config/datasource/DynamicDataSourceService.java

@@ -97,6 +97,18 @@ public class DynamicDataSourceService {
                     connected = false;
                 }
             }
+            else if(connection.getMetaData().getDriverName().toLowerCase().contains("oracle")) {
+                Statement statement = connection.createStatement();
+                ResultSet resultSet = statement.executeQuery("SELECT 1 FROM DUAL");
+                resultSet.next();
+                int result = resultSet.getInt(1);
+                if(result == 1) {
+                    connected = true;
+                }
+                else {
+                    connected = false;
+                }
+            }
             else {
                 connected = connection.isValid(1);
             }