/**
  * 添加查询表达式.表达式之间使用OR连接,
  *
  * @param expressions
  */
 public Condition or(
     Expression expression1, Expression expression2, Expression... moreExpressions) {
   compositeExpression.add(Restrict.or(expression1, expression2, moreExpressions));
   isContruct = false;
   return this;
 }