摘要：
Restrictions for Datatypes对数据类型的约束Constraint约束Description说明enumerationDefines a list of acceptable values定义了一系列的有效值fractionDigitsSpecifies the maximum number of decimal places allowed. Must be equal to or greater than zero指定了允许的小数位数的最多位数。必须大于等于0lengthSpecifies the exact number of characters or list 阅读全文
posted @ 2011-04-07 17:52 脚印 阅读(390) 评论(0) 推荐(0) 编辑