//序号一列长度不限，但前两位为XH, 后位均为数字

//每条记录的序号自动生成，为当前student表中的最大序号值加1得到。

//以下编写代码实现新增学生记录。-//No one of any length, but the first two for the XH, after the bits are digital// automatically generated sequence number for each record, the current student table to get the maximum number value plus one.// Add the following code to achieve student records.