oracle数据库提供了BLOB字段，我们可以使用这个字段往数据库保存二进制文件，此例子示范了delphi如何操作BLOB字段，实现往oracle数据库存/取二进制文件。-oracle database provides a BLOB field, we can use this field to save the binary file into the database, this example demonstrates how delphi BLOB field to the oracl

sql server数据库备份恢复，可以保存备份列表，恢复时可以中断正在使用的连接，还可以附加mdf文件-sql server database backup and recovery, you can save the backup list, resume interrupted when the connection is being used, you can also attach mdf file