@Column(name = "price",precision = 10,scale = 2)

    public double getPrice() {

        return price;

    }

使用 precision 与 scale 没有效果，要换成：使用columnDefinition来处理

@Column(name = "price",columnDefinition = "double(10,2) default '1.00'")

    public double getPrice() {

        return price;

    }

对于precision和scale的用法：

• int - precision - (Optional) The precision for a decimal (exact numeric) column. (Applies only if a decimal column is used.)
• int - scale - (Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.

这两个值只针对 BigDecimal 类型有用