code: protected void configure(Statement statement) {
          // for thread safety, grab local copy
          Closure configureStatement = this.configureStatement;
          if (configureStatement != null) {
              configureStatement.call(statement);
          }
      }
docs: Provides a hook for derived classes to be able to configure JDBC statements.
  Default behavior is to call a previously saved closure, if any, using the
  statement as a parameter.
  
  @param statement the statement to configure