数据库主键自增问题

oracle：
<insert id="insertLog" parameterClass="Log">
<![CDATA[
INSERT INTO LOG (ID, USERID, DOCID, RESULT, INVOKETIME, ENDTIME)
VALUES (CMDB_SEQ.NEXTVAL, #userId#, #docId#, #result#,#invokeTime#, #endTime#)
]]>
<selectKey resultClass="int" keyProperty="id" >   
      SELECT CMDB_SEQ.CURVAL FROM DUAL
    </selectKey> 
</insert>

DB2：
<selectKey resultClass="int" keyProperty="TREE_ID" >  
SELECT IDENTITY_VAL_LOCAL() as TREE_ID FROM SYS.TREE
</selectKey>


u can use <selectKey> section

Cloudscape  VALUES IDENTITY_VAL_LOCAL()
DB2         VALUES IDENTITY_VAL_LOCAL()
Derby       VALUES IDENTITY_VAL_LOCAL()
HSQLDB      CALL IDENTITY()
MySql       SELECT LAST_INSERT_ID()
SqlServer   SELECT SCOPE_IDENTITY()
SYBASE      SELECT @@IDENTITY
ORACLE      SELECT CUSTOM_SQL.NEXTVAL AS ID FROM DUAL