hibernate 主键生成方式
??????? type="typename" ?????????????????????????
??????? column="column_name" ????????????????????
??????? unsaved-value="any|none|null|id_value" ??
??????? access="field|property|ClassName"> ??????
??????? <generator type="long" column="uid" unsaved-value="0">
??????? <generator type="long" column="cat_id">
??????? <generator type="long" column="cat_id">
??????? <generator type="long" column="uid">
??????? <generator type="long" column="uid" unsaved-value="0">
??????? <generator type="long" column="uid">
??? <generator class="sequence">
??????? <param name="sequence">uid_sequence</param>
??? </genarator>
</id>

注意:

<generator class=""> 里面可以选啊!推荐Oracle用sequence，seqhilo

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