如何阅读Excel工作表的一部分，而不是整个Java？

I made a small application which reads in an Excel File. I connected it to my MySQL Database so that I can put the file into the database, which contains multiple tables. However, when implementing the values into the 'Orders' table, there is an SQLException and the values do not get into the database. That's the exception in the CustomerMC class. The values of the 'Customers' table do get into the database.I made a small application which reads in an Ex