1. 参数中直接加入%%,注意不需要加两个单引号,加了就会出错,因为系统会自动为字符串类型加上两个单引号 <select id="selectPersons" resultType="person" parameterType="person"> select id,sex,age,username,password from person where true <if test="username!=null&qu…
Problem Description Last year summer Max traveled to California for his vacation. He had a great time there: took many photos, visited famous universities, enjoyed beautiful beaches and tasted various delicious foods. It is such a good trip that Max…