mybatis的choose,when,otherwize标签

<select id="dynamicChooseTest" parameterType="Blog" resultType="Blog">
   select * from t_blog where 1 = 1 
    <choose>
        <when test="title != null">
            and title = #{title}
        </when>
        <when test="content != null">
            and content = #{content}
        </when>
        <otherwise>
            and owner = "admin"
        </otherwise>
    </choose>
</select>