关于hibernate主键的自增长

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引用

Hibernate使用sequence生成自动主键，需两步
1：在库中建立sequence
CREATE SEQUENCE exp_sequence

INCREMENT BY 1
START WITH 1
NOMAXVALUE
NOCYCLE
NOCACHE ;

2:在hbm.xml文件中配置如下
<id name="userId" type="java.math.BigDecimal">
            <column name="USER_ID" precision="22" scale="0" />
            <generator class="sequence">
            <param name="sequence">exp_sequence</param>
            </generator>
        </id>