Performing File Operations

mikolunzxc wrote:pwede po bang magkaron nang maraming childfile ?

airojames wrote:Ano po midterm exam namin? Written or actual? Haha

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Emie Ligutan wrote:

Jericho wrote:Ang parent file ba pwede mag produce ng parent file den?

I think d magproproduce ng parent file ang parent file. magpoproduce sya ng child file pero hnd ng parent file. Parang in real life lng hahahahah

Bermon O. Ferreras Jr wrote:

airojames wrote:Mam dba gumawa ng yung database ng new file so d pa rin mawawala yung unang file eh paano po kung inulit yun 100times nandoon pa rin po ba yung unang file?

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hindi na mawawala  yun andon pa din yun nag uupdated nalang yun. so lumalaki lang yung file nun.

Admin Rash wrote:

Our business is about technology, yes. But it's also about operations and customer relationships. ㅡ Michael Dell

To use data files in your programs, you need to understand several file operations:

• Declaring a file identifier
  
• Opening a file
  
• Reading from a file and processing the data
  
• Writing to a file
  
• Closing a file
  

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Declaring a File Identifier
Most languages support several types of files, but one way of categorizing files is by whether
they can be used for input or for output. Just as variables and constants have data types such as
num and string, each file has a data type that is defined in the language you are using.

InputFile employeeData
OutputFile updatedData

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Opening a File
Opening a file locates it on a storage device and associates a variable name within your program with the file.

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Reading Data from a File and Processing it
Before you can use stored data within a program, you must load the data into computer memory. You never use the data values that are stored on a storage device directly. Instead, you use a copy that is transferred into memory. When you copy data from a file on a storage device into RAM, you read from the file.

input name from employeeData
input address from employeeData
input payRate from employeeData

Most languages also allow you to write a single statement in
the following format:

input name, address, payRate from employeeData

A computer program can read records from a file sequentially or randomly.

Sequential files, reads all the records in the file from beginning to end, processing
them one at a time.
Sorting is the process of placing records in
order by the value in a specific field or fields.

Examples of sorted, sequential files include the following:

• A file of employees whose data is stored in order by ID number
  
• A file of parts for a manufacturing company whose data is stored in order by part number
  
• A file of customers for a business whose data is stored in alphabetical order by name
  

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Writing Data to a File
When you store data in a computer file on a persistent storage device, you write to the file . This means you copy data from RAM to the file. When you write data to a file, you write the contents of the fields using a statement such as the following:

output name, address, payRate to employeeData

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Closing a File
When you finish using a file, the program should close the file —a closed file is no longer
available to your application. Failing to close an input file (a file from which you are reading
data) usually does not present serious consequences; the data still exists in the file.

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A Program that Performs File Operations

The flowchart contains a program that opens two files—an input file and an output file. The program reads each employee record from the input file, alters the employee’s pay rate, and writes the updated record to an output file. After all the records have been processed, the program closes the files.

A backup file is a copy that is kept in case values need to be restored to their original state. The backup copy is called a parent file and the newly revised copy is a child file .

Bermon O. Ferreras Jr wrote:

airojames wrote:Ano po midterm exam namin? Written or actual? Haha

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syempre parehas yun. gagawin written at actual . para malaman kung naiintindihan mo ba yung topic at para malaman kung kaya mo na yun

Jericho wrote:Ang parent file ba pwede mag produce ng parent file den?

Emie Ligutan wrote:

Emie Ligutan wrote:

Jericho wrote:Ang parent file ba pwede mag produce ng parent file den?

I think d magproproduce ng parent file ang parent file. magpoproduce sya ng child file pero hnd ng parent file. Parang in real life lng hahahahah

Yung child file mo magiging parent file . tas yung parent dati magiging grandparent file

:BOAR'SWrath: wrote:Ma'am nacurious lang po ako kung nadelete ung data base pede pa po ba siyang marecover  gamit ng ibang application?

airojames wrote:Comma delimiter lang po talaga pwede gamitin? Bawal na po yung ibang character?

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Jericho wrote:

mikolunzxc wrote:pwede po bang magkaron nang maraming childfile ?

yes pwede dumami yung child file.

Vann Lewis wrote:

airojames wrote:Comma delimiter lang po talaga pwede gamitin? Bawal na po yung ibang character?

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Depende siguro sa Programming Language Pre. Iba-iba naman siguro ang mga Delimiter nila.

:BOAR'SWrath: wrote:Ma'am nacurious lang po ako kung nadelete ung data base pede pa po ba siyang marecover  gamit ng ibang application?

mikolunzxc wrote:

Jericho wrote:

mikolunzxc wrote:pwede po bang magkaron nang maraming childfile ?

yes pwede dumami yung child file.

ahhh so kahit ilan pala salamatsu

Bermon O. Ferreras Jr wrote:Maam what if nakapag produce ng napakaraming child file yung parents files babagal po ba yun ?

Bermon O. Ferreras Jr wrote:tanung lang maam. kaya po bang baguhin yung laman ng data base ?

James Navarro wrote:Thank you po maam for this post, very well explained po

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Vann Lewis wrote:

:BOAR'SWrath: wrote:Ma'am nacurious lang po ako kung nadelete ung data base pede pa po ba siyang marecover  gamit ng ibang application?

Recycle Bin ang pwedeng pagkuhanan ng File na na-delete. Haha!

Bermon O. Ferreras Jr wrote:

James Navarro wrote:Thank you po maam for this post, very well explained po

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Agree po ako maam. Naintindihan ko den po ng maayos pero may mga tanong pa den po ako.

Luwiezzz wrote:Thank you Ms. Rashlyn for this, it really helped me a lot understanding file operations

:BOAR'SWrath: wrote:Ma'am nacurious lang po ako kung nadelete ung data base pede pa po ba siyang marecover  gamit ng ibang application?