这个程序是将c:\1.pdf存储到数据库中，然后通过blob类型的变量将存进数据库中的1.pdf读出来并保存为c:\test.pdf。-This program is c: \ 1.pdf stored in the database, and then through the blob type variable will be deposited into the database 1.pdf read out and saved as c: \ test.pdf.