Cannot determine value type from string ‘＜p＞1＜/p＞‘

Troubleshooting ：
1. Whether the name in the mapping class is the same as the name in the database or the name renamed in the query statement
2. Is the type consistent ( I just don't know how to description The type of is wrong , It's written in long 了 )
3. After defining the parameterized constructor in the mapping class , The parameterless constructor provided by the system by default will no longer be provided , So adding a parameterless constructor can solve the problem