code: protected boolean existsTable(){
          try {
              int count = sqlManager.getSingleResult(Integer.class,
                      new StringSqlResource(String.format("SELECT COUNT(*) FROM %s", tableName)));
  
              if(count == 0){
                  // TODO Should insert an initial record?
                  return false;
              }
              return true;
  
          } catch(SQLRuntimeException ex){
              return false;
          }
      }
docs: Checks the table which manages a schema version exists or not exists.
  
  @return if the table exists then returns true; otherwise false