发生错误，错误原因：
org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [insert into club_recommend_detail (createtime,target_id,user_id,id) values (?,?,?,?)]; Duplicate key or integrity constraint violation message from server: "Column 'user_id' cannot be null"; nested exception is java.sql.SQLException: Duplicate key or integrity constraint violation message from server: "Column 'user_id' cannot be null"