向資料庫中插入資料異常：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DuplicateKeyException: 
### Error updating database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '7' for key 'PRIMARY'
### The error may involve cn.itcast.ssm.mapper.ItemsMapper.addItems-Inline
### The error occurred while setting parameters
### SQL: insert into items(id,name,price,pic,createtime,detail)values(?,?,?,?,?,?)
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '7' for key 'PRIMARY'
 

; SQL []; Duplicate entry '7' for key 'PRIMARY'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '7' for key 'PRIMARY'
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:927)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

出現以下異常，com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '7' for key 'PRIMARY'；說明在資料庫中這一列，它是關鍵字！這個關鍵字資料庫中有，所以出現下面異常；就需要把關鍵字換成資料庫表中沒有存在的字。