Delphi record type of file

I. Record file type file:

1 can be roughly understood as a database, such as the local QQ program in some account information set (account number, password, last logon time, etc.) recorded in the. dat file.

2 record file type file vs database

Same point: All can be used to record data

Difference: Record file type files are similar to Notepad record data, resulting in the deletion of data is not as convenient as the database.

3 The Delphi record type document definition

First step:

Define a set of records

Type

Myfile= Record

NAME:STRING[20]; You must specify the size of the string in the recordset

SEX:STRING[10]; Ditto

Age:integer;

End End

Part II:

Declares a recordset file, while declaring a recordset

Myselffile:file of MyFile; Affirm recordset file

Myselfinfo:myfile; DECLARE recordset

Part III:

Assigning values to recordsets and recordset files

Assigning values to recordsets

Myselfinfo.name: = Edit1.text;

Myselfinfo.sex: = Edit2.text;

Myselfinfo.age: = Strtoint (Edit3.text);

Assign values to the recordset file below

If Savedialog1.execute Then

Begin

AssignFile (Myselffile, savedialog1.filename); Hook a recordset to a disk file,

Write this sentence immediately write CloseFile (myselffile);

If FileExists (savedialog1.filename) then//determine if the file exists

Reset (Myselffile)//exists to open as read-only (Rewrite), delete the original file, and then create a new file

else Rewrite (myselffile); Does not exist is opened in a write-only manner;

In both ways, the file (myselffile) pointer points to the 0-bit child of the file's contents

Seek (Myselffile, FileSize (myselffile)); This sentence points the pointer to the end of the file.

Write (Myselffile, myselfinfo); Writes a recordset to a file. Reads in read (Myselffile, myselfinfo);

CloseFile (Myselffile); Turn off associated with the disk, and AssignFile corresponds

End

Fourth Step: Finally

Suppose you write to the following group of records

Control: Edit1.text Edit2.text Edit2.text

Information: Zhang So-and-so man 21

Zhou So-and-So woman 21

The XXX male 21

Meng So-and-So woman 21

Zheng So-and-So man 21

Wang So-and-so man 21

Text opened after the contents of the file (note:& is garbled)

Zhang So-and-so male & Zhou xxx female & XXX male & Meng xxx & Zheng So-and-so man & Wang So-and-so Man &

Note: Only the read (Myselffile, myselfinfo) data can be used in the software for normal reading.

Summary: A record set is like a class in Java. Writing is also a bit like java. Learn Delphi, nothing can edify

SOURCE http://7071976.blog.51cto.com/7061976/1208387