<select id="findCustomer" parameterType="String" resultType="cn.itcast.util.Customer">
<include refid="selectCus"></include>
</select>
<sql id="selectCus">
select * from cst_customer where cst_id like CONCAT(CONCAT('%',#{VALUE},'%'))
</sql>
sql标签中放的是sql语句,可以通过include标签进行引用