TAILIEUCHUNG - About Java and xBaseJ- P2

Tham khảo tài liệu 'about java and xbasej- p2', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 1 - Fundamentals 21 DOS and by extension Windows made significant use of three-character file extensions to determine file types. Linux doesn tsupport file extensions. It can be confusing for a PC user when they see on a Linux machine and they hear the . is simply another character in a file name. It is even more confusing when you read documentation for applications written initially for Linux like OpenOffice and it talks about files with an ODT extension. I came from multiple operating systems which all used file extensions. I don care that I nwriting this book using Lotus Symphony on KUbuntu I mgoing to call .NNN a file extension and the purists can just put their fingers in their ears and hum really loud. The original file extension for the dBASE data file was .DBF. Some clone platforms changed this and some did not. It really depended on how far along the legal process was before the suits were dropped. In truth you could use nearly any file extension with the programming libraries because you passed the entire name as a string. Most of the C C and Java libraries look at a special identifier value in the data file to determine if the file format is dBASE III dBASE IV dBASE III with Memo dBASE IV with Memo dBASE V without memo FoxPro with Memo dBASE IV with SQL table Paradox or one of the other flavors. Foxbase and FoxPro were actually two different products. The Memo field was something akin to a train wreck. This added the DBT file extension to the mix FPT for FoxPro. A Memo field was much as it sounded a large free-form text field. It came about long before the IT industry had an agreed upon best practice for handling variable length string fields in records. The free form text gets stored as an entity in the DBT file and a reference to that entity was stored in a fixed length field with the data record. You have to remember that disk space was still considered expensive and definitely not plentiful back in those days. Oh we thought we .

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