<mapper namespace"com.itheima.mybatis.mapper.UserMapper"><!-- //根据用户名称模糊查询用户列表#{} select * from user where id #{v} 占位符 #{v} 五${} select * from user where username like %${value}% 字符串拼接 ${value} 五--…
User.xml
<mapper namespace"com.itheima.mybatis.mapper.UserMapper"><!-- 通过ID查询一个用户 --><select id"findUserById" parameterType"Integer" resultType"User">select * from user where id #{v}</s…