Hello!
What does it mean when it says that there is no information about the data
types of the data extracted from a CSV file.
Can somebody this.
//Tony
10  2021 
On Mon, 11 Aug 2008 13:49:19 +0200, "Tony Johansson"
<jo************ *****@telia.com wrote:
>Hello!
What does it mean when it says that there is no information about the data
types of the data extracted from a CSV file.
Can somebody this.
//Tony
Take a simple example, a CSV file containing "123". You cannot tell
from the CSV file alone whether this is the integer 123, the double
123.0, the string "123" or the character array {'1', '2', '3'}.
When you convert some data into a string for a CSV file much of the
type information is lost.
HTH
rossum
On Aug 11, 12:49*pm, "Tony Johansson" <johansson.ande rs...@telia.com >
wrote:
What does it mean when it says that there is no information about the data
types of the data extracted from a CSV file.
It would help if you'd clarify what "it" is here.
Jon
Tony Johansson wrote:
What does it mean when it says that there is no information about the data
types of the data extracted from a CSV file.
The CSV does not contain information about the data type of each column.
It will be a guess based on the values.
Arne
rossum wrote:
On Mon, 11 Aug 2008 13:49:19 +0200, "Tony Johansson"
<jo************ *****@telia.com wrote:
>What does it mean when it says that there is no information about the data
types of the data extracted from a CSV file.
Take a simple example, a CSV file containing "123". You cannot tell
from the CSV file alone whether this is the integer 123, the double
123.0, the string "123" or the character array {'1', '2', '3'}.
Strings are usually quoted and arrays not used in CSV, so some
types can be ruled out.
Arne
Strings are usually quoted and arrays not used in CSV, so some
types can be ruled out.
Speaking of which, is there an "official syntax" for CSV files somewhere,
and/or a C# tool to parse them? http://www.creativyst.com/Doc/Articles/CSV/CSV01.htm shows the rules for
csv file creation. There are no standard c# tools that I know of to
parse them, but the Code Project has a few public projects which will do
this for you or point you in the right direction to roll your own.
It's fairly easy to parse them by using the string.split functionality
of c#. I have a number of samples if you need some help.
"MC" <fo************ **@www.ai.uga.e du.slash.mcwrot e in message
news:#M******** ******@TK2MSFTN GP02.phx.gbl:
Strings are usually quoted and arrays not used in CSV, so some
types can be ruled out.
Speaking of which, is there an "official syntax" for CSV files somewhere,
and/or a C# tool to parse them?
MC wrote:
>Strings are usually quoted and arrays not used in CSV, so some
types can be ruled out.
Speaking of which, is there an "official syntax" for CSV files somewhere,
and/or a C# tool to parse them?
I don't think there is a general definition.
But most programmers have an idea about what it is.
Export/import from/to Access shows some of the options.
The most common format is:
- comma between fields
- double quotes around text
- double quotes within text doubled
- one record per line
There actually is a standard: http://tools.ietf.org/html/rfc4180
but it i snot my impression that it is widely used
as a reference.
Arne
On Mon, 11 Aug 2008 21:52:20 -0400, MC wrote:
>Strings are usually quoted and arrays not used in CSV, so some types
can be ruled out.
Speaking of which, is there an "official syntax" for CSV files
somewhere, and/or a C# tool to parse them?
I would strongly recommend that you don't use CSV at all. I believe that
CSV is the worst possible method of delivering data. I am aware of Excel
exporting data to CSV that imported differently.
Different programs do that handle Quotes properly for example 'O'Donnell'
should be 'O''Donnell'. If you have quote comma you are totally lost
'1 degree 0', something' A parser would take that as two fields, but is
it extracted as :1 degree 0:, :something': or as :something:. You can
never tell.
Ken
Ken
Ken Foskey wrote:
I would strongly recommend that you don't use CSV at all. I believe that
CSV is the worst possible method of delivering data.
The format has worked for a few decades. It can not be completely
hopeless. Usually the developers get it working.
I would also prefer XML as format, if starting white a blank
piece of paper. But that is often not the case. There are
lots of software out there that uses CSV.
Arne This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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