mybatis bulk insert: mysql and oracle

mybatis bulk insert

mysql database:

<insert id="batchInsert" parameterType="java.util.List" useGeneratedKeys="false">
    insert into user( id,name)
    values
    <foreach collection="list" item="item" index="index" separator=",">
    	(
    		#{item.id},
    		#{item.name}
    	)
    </foreach>		
</insert>    

oracle database:

<insert id="batchInsert" parameterType="java.util.List" useGeneratedKeys="false">
    insert into user(id,name)
    <foreach collection="list" item="item" separator="union all">
    	select
    		#{item.id},
    		#{item.name}
    	from dual
    </foreach>		
</insert>    

mybatis oracle for the bulk insert no values keyword , foreach of the separator is All of Union , foreach table in sql dual use select (field) from dual