So, i have a school project to build the uberEats management system in C.
I have a csv file that contains the cities where the system is available and their respective code. Eg: 1, New York.
And i need to read that file, so when the user inserts one code, it associates to the specific city. Can anyone help me how to do that?
you could read the file and make a matrix of 2xno_cities, and when the user puts a number, you just do
array[input-given-by-user][1]
since the first [] would be for the row, and the second one for the column, which is where you save the cities,
Related
I'm going to create a simple database bank account in C-language but I haven't quite figured out how I'm gonna fetch data for a specific account already created and sent to a file. I was thinking of doing a search from the beginning of the file using fseek for an account number specified since all account numbers will be unique. Is there a way to read the the amount of lines specified below that account number once it is found? For e.g in my file accounts.txt there will be the accounts
Account # : 13398
First Name : Eric
Last Name : Walters
Parish : St.tofu
Year of Birth : 1980
Age : 34
Savings Period : 5 year(s)
Password : Eric1
Account # : 13398
Account balance: $0.00
====================================
I want to search through the file for the account number and fetch it along with everything else 10 lines below it and display it on the screen if this is possible then say 'aye' and point me to a certain area I should study to achieve this and when I'm successful i'll post my coding here to show what I have done.
fseek() allows you to skip a certain number of bytes in each file. If your lines are not always the same length, you will have to read the entire file, not just to search for the account numbers, but also to find the ten newlines that delimit each account. To do this, you are better off using fgets().
The steps would be something like this
foreach line in file
if line starts with "Account Number"
if the number is the one you want
print the next 10 lines
else
skip the next 10 lines
else
keep looking
Firstly, fseek is used to move the file pointer not for searching. For search text, i.e. account id in your case, there is some examples Trying to find and replace a string from file in C. To write your own code, learning the basic use of file handling functions is enough. Furthermore, since your data is structured (every 11 lines represent one account), you code can be accelarated. At last, what you are trying to do is what database software offers and it is hard too implement your own database as fast as commercial software.
You could search in the file, but that would be a bit tedious. Even more tedious if you wanted to modify the account details.
Why don't you use SQLite:
It is designed to replace fopen().
?
I am not expert about AS400, just know some commands and i exporti some files from AS400 (iSeries) into SQL Server 2005.
Actually i need to know which RPG Program created a file in a library. This because that file contains statistic data from other files stored in other AS400 libraries.
This screenshot show the file STTMVF in the library DAT_4DWH (by DSPLIB DAT_4DWH)
So there are a command that let me know which RPG program created the file STTMVF ?
If yes i need to open the source RPG or CL and try to understand which phisical files are used to compose this statistic file.
Thanks in advance!
You can use journal management or program references to determine what is writing to the file.
Journal management
Starting the journal
To create a basic journal you need to create a journal receiver, a journal, and activate journalling for the file. Replace RECEIVER-LIB, RECEIVER-FILE, JOURNAL-LIB, JOURNAL-FILE, FILE-LIB and FILE with values appropriate for your system.
CRTJRNRCV JRNRCV(RECEIVER-LIB/RECEIVER-FILE)
CRTJRN JRN(JOURNAL-LIB/JOURNAL-FILE) JRNRCV(RECEIVER-LIB/RECEIVER-FILE)
STRJRNPF FILE(FILE-LIB/FILE) JRN(JOURNAL-LIB/JOURNAL-FILE) OMTJRNE(*OPNCLO)
Dumping the journal
DSPJRN JRN(JOURNAL-LIB/JOURNAL-FILE) FILE(FILE-LIB/FILE) RCVRNG(*CURCHAIN) JRNCDE(R) ENTTYP(PT PX DL UP) OUTPUT(*OUTFILE) OUTFILFMT(*TYPE1) OUTFILE(QTEMP/QADSPJRN)
Querying the journal
The field JOPGM will contain the program name that inserted, updated, or deleted records from the file.
Removing the journal
ENDJRNPF FILE(FILE-LIB/FILE)
DLTJRN JRN(JOURNAL-LIB/JOURNAL-FILE)
Program references
Dumping the references
DSPPGMREF PGM(*ALLUSR/*ALL) OUTPUT(*OUTFILE) OUTFILE(QTEMP/QADSPPGM)
Querying the references
Search the file for all references where the field WHFNAM equals FILE. The field WHPNAM will contain the program name. Due to file overrides, etc this method is not as accurate as using a journal.
Here's a summary of my problem:
Our company's old software had a large database of contacts in it.
We switched to a new program and have no way to easily transfer those contacts to it.
The contacts database appears to have 4 files which can all be opened in Excel, but not MSAccess. The four files contain the following:
File 1: A nicely formatted spreadsheet of names and some other BASIC info for each contact. There is an ID number on each one, but the numbers do not seem to correspond to anything in File 2.
File 2: Info on each contact, but not in rows. Instead it looks something like this :
JHGH_CONTACT_BLOB: 1426367745
EMAIL: SMITH
WEB:
PHONE_COUNT: 1
FAX_COUNT: 0
ADDRESS_COUNT: 0
NOTE_COUNT: 0
555-7364
(I changed some info for privacy reasons)
Each blob of info is on a separate spreadsheet row. Each starts off with the same first line, even the number is the same, so it can't be some sort of ID number.
File 3: A file containing a lot of gobbledygook, interspersed with a few readable bits of text here and there. The readable text looks like it belongs to the database (ie, it is info on contacts like place of work and other notes.)
File 4: Contains one row and one column labeled ID, with the number 12725 in it.
I need to somehow get the info from File 2, into the nicely formatted file 1. In essence, I need to add the phone numbers, emails etc included in a messy fashion in file 2 on their proper rows in file 1.
This probably makes little sense and I thank you for even reading down this far. If you have any suggestions, I'd love to hear them.
Thanks
We have established that you have a DBF file, an FPT file and a CDX file. These are likely to all relate to Visual FoxPro (a now discontinued Microsoft product).
The .dbf file can be opened in Excel via the standard file open dialog by changing "Files of type" to "dBase files (*.dbf)". Going by your original post, Excel seems to be able to open this sensibly in the first place.
The combination of all three files might be accessible by downloading this OLE DB provider for FoxPro which would let you access the database from Excel using the methods outlined here
You can get more info on the specific file structures at the following links: DBF, FPT and CDX. The DBF contains most of the data, the FPT contains binary memo data and the CDX is an index file.
I am creating an application in which i need to add a new column in the csv file and then entries for that particular column.
And I have tried OutputStream and PrintStream but the problem is that the data is being written in starting of the file but i want the data at random position according to my need.
And RandomAccessFile is not identified by the application.
For e.g.
My CSV is:
Name,any_date
A,
B,
c,
And after writing it will look like
Name,any_date
A,p
B,a
C,p
I am using file Connection API to read and write.Can anyone suggest me how to do that??
Thanks in advance.
i think you want to append data in the file.
you can try this
os = fconn.openOutputStream(fconn.fileSize());
os.write(data.getBytes());
This is a simple example to append data at last.
I have a contact manager program and I would like to offer the feature to import csv files. The problem is that different data sources order the fields in different ways. I thought of programming an interface for the user to tell it the field order and how to handle exceptions.
Here is an example line in one of many possible field orders:
"ID#","Name","Rank","Address1","Address2","City","State","Country","Zip","Phone#","Email","Join Date","Sponsor ID","Sponsor Name"
"Z1234","Call, Anson","STU","1234 E. 6578 S.","","Somecity","TX","United States","012345","000-000-0000","someemail#gmail.com","5/24/2010","z12343","Quantum Independence"
Notice that in one data field "Name" there is a comma to separate last name and first name and in another there is not.
My plan is to have a line for each field (ie ID, Name, City etc.) and a statement "import to" and list box with options like: Don't Import, Business>Join Date, First Name, Zip
and the program recognizes those as properties of an object...
I'd also like the user to be able to record preset field orders so they can re-use them for csv files from the same download source.
Then I also need it to check if a record all ready exists (is there a record for Anson Call all ready?) and allow the user to tell it what to do if there is a record (ie mailing address may have changes, so if that field is filled overwrite it, or this mailing address is invalid, leave the current data untouched for this person, overwrite the rest).
While I'm capable of coding this...i'm not very excited about it and I'm wondering if there's a tool or set of tools out there to all ready perform most of this functionality...
I hope this makes sense...
Is there a header row?
usually in CSV files, the first line is the header.
If so you could use the header line to determine the order, just have a list of column names, and only prompt the user if a column name does not match.(this could then be auto added into the predefined list).
EDIT:
even if a header does not exist, its simple enough to add one. The file can be manually edited. Alternatively in your program let the user define it (from your predefined list)
I can't find any tools all ready out there and no one has replied otherwise, so for the sake of leaving a question answered until otherwise notified the answer is: no.