@Column 的length属性仅队String类型的字段有效?
官方网站上说是,可选的,没有标明说是仅对String类型的字段有效啊??
确实是只对String有效啊,文档说了。
public abstract int length(Optional) The column length. (Applies only if a string-valued column is used.)
public abstract int length
(Optional) The column length. (Applies only if a string-valued column is used.)