mapper 如下：
使用<selectkey>实现 也可以使用oracle的row 级触发器trigger实现；
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hxb.wide.demo.mapper.CCustInfoMapper">
<resultMap >select * from C_CUST_INFO where CUST_NO = #{custNo,jdbcType=VARCHAR}</select>
</mapper>