Book Recommendation?
Greets Folks, I wrote in yesterday as per the author of the DBI module, but the documentation i have found really doesnt seem sufficient for learning the module... Is there a book I should buy for this? I checked ou this book: http://www.amazon.com/exec/obidos/ASIN/1565926994/ref=ase_dbi/102-6988665-4359353 But this is a 350 page book, and I am just starting out. Is there something a little more concise? I've got Paul DuBois' book MySQL and Perl for the Web, but I feel like maybe I shoudl focus more on the DBI module itself before going too much further into DuBois' book. What would you folks recommend? Thanks, Will __ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com
Re: [Poop-group] ANNOUNCE: Class::DBI 0.89
On Tue, Jun 25, 2002 at 08:46:47AM +, william ross wrote: i notice that defining a relationship with might_have doesn't add a column to $class-__hasa_columns. is that something you're likely to change? it's enormously useful for me to be able to define relationship columns which might not be occupied - eg person foo might_have a mugshot in the images table - but at the moment i don't think i can use it because my input functions depend on reading $class-columns and attempting to fill the vacancies that defines. Hmmm... might_have works slightly differently from hasa, so I'm slightly reluctant to start adding its information into the __hasa_columns info. I have a sneaky suspicion that doing this would cause cries of horror from other people who manipulate this information for some other purpose. What I need to do for some other project is have a way of asking a Class::DBI class for some information about itself - what columns it has, what relationships it has etc. If there was a good interface to this would that do what you need? Has anyone any suggestions for how this should operate? Tony
Re: HELP ME !! Can't locate object method connect via package DBI
On Tue, 25 Jun 2002 11:55:36 -0400, [EMAIL PROTECTED] wrote: Can't load module DBI, dynamic loading not available in this perl. This means you have a statically compiled perl, without support for dynamic loading. It should help to recompile perl. As the error message goes on, you basically have two options: (You may need to build a new perl executable which either supports dynamic loading or has the DBI module statically linked into it.) If you're inexperienced in compiling C programs on your system, this will rather be a daunting task. You'd better find someone who's done that before, or, at least, find a very detailed tutorial. -- Bart.
Inserting formatted Date
This works fine: my $sth = $dbh-prepare( INSERT INTO stats VALUES (SYSDATE,?,?,?,?) ) or die Cannot prepare SQL statements from $DBI::errstr\n; however if i try to format it like: my $sth = $dbh-prepare( INSERT INTO stats VALUES (to_char(SYSDATE, 'Dy DD-Mon- HH24:MI'),?,?,?,?) ) or die Cannot prepare SQL statements from $DBI::errstr\n; -- it fails, it tried quoting it with: $qstr = q!to_char(sysdate, 'Dy DD-Mon- HH24:MI')!; and plugging that in: $dbh-prepare( INSERT INTO stats VALUES ($qstr,?,?,?,?) -- failed ! even tried quote(): $qstr = to_char(sysdate, 'Dy DD-Mon- HH24:MI'); $q = $dbh-quote($q); $dbh-prepare( INSERT INTO stats VALUES ($q,?,?,?,?) -- still fails any ideas? Thanks Jim
Re: How I can eliminate the double quotes when I read a csvfile?
TIBA, LIVIA wrote:
Thanks Jeff,
I already tried that, because I read about the default value for
quote_char, escape_char but doesn't work.
It works for me. Please try this script which creates the data file you
described and then reads it with DBD::CSV. It works as it should for
me. If it doesn't for you, please tell me what platform you're on, and
what versions of perl, DBI, DBD::CSV, and SQL::Statement you are using
and the script output.
#!perl -w
use strict;
use DBI;
my $dbh=DBI-connect('dbi:CSV(RaiseError=1):');
open( O, PM_Report) or die $!;
print O EOP;
MSUID|ServiceType
ALM75SPR-001|WAN
ARP350JOH-001|WAN
EOP
close O;
$dbh-{'csv_tables'}-{'PM_Report'} = {
'eol' = \n,
'sep_char' = '|',
'file' = './PM_Report'
};
my $sth = $dbh-prepare('SELECT * FROM PM_Report');
$sth-execute;
while (my $row = $sth-fetchrow_arrayref) {
for my $col( $row ) {
print [$col] ;
}
print \n;
}
__END__
--
Jeff
RE: Inserting formatted Date
I think the problem here is a type problem. The to_char is returning a char type and the column is a date type. To_char returns a character string and that's failing on the insert due to the table requiring a date type. Without knowing exactly what database you are using I can't give you much help making it work. In Oracle it would be something like: to_date(to_char(SYSDATE, 'Dy-DD-Mon- HH24:MI'), 'Dy-DD-Mon- HH24:MI') Gordon -Original Message- From: Kipp, James [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 25, 2002 11:41 AM To: DBI-Users Subject: Inserting formatted Date This works fine: my $sth = $dbh-prepare( INSERT INTO stats VALUES (SYSDATE,?,?,?,?) ) or die Cannot prepare SQL statements from $DBI::errstr\n; however if i try to format it like: my $sth = $dbh-prepare( INSERT INTO stats VALUES (to_char(SYSDATE, 'Dy DD-Mon- HH24:MI'),?,?,?,?) ) or die Cannot prepare SQL statements from $DBI::errstr\n; -- it fails, it tried quoting it with: $qstr = q!to_char(sysdate, 'Dy DD-Mon- HH24:MI')!; and plugging that in: $dbh-prepare( INSERT INTO stats VALUES ($qstr,?,?,?,?) -- failed ! even tried quote(): $qstr = to_char(sysdate, 'Dy DD-Mon- HH24:MI'); $q = $dbh-quote($q); $dbh-prepare( INSERT INTO stats VALUES ($q,?,?,?,?) -- still fails any ideas? Thanks Jim
RE: Inserting formatted Date
What is the data type for the field into which you are inserting the date? If it's a DATE field, you do the formatting when you retrieve the value, not when you set it. If it's not a DATE field, it should be. the data type is 'date'. I wanted to format it as i insert because the field is a key on 2 tables i will be querying on (so the date/time should be =)? i guess the question would then be how does oracle store the date ? meaning if it is formatted then stored, does oracle still store it like 6/25/2002 1:18:14 PM anyway.
RE: Inserting formatted Date
Oracle stores the date as a number. This works out as the number of seconds from a significant date (in Oracle's mind). Therefore, you must send it as a date (or number). The to_char function returns the character representation of the number stored in the field. so then it does not matter how i format it before when i insert it? what i mean if i insert a date that is formatted to 25-Jun-2002 13:44(no seconds) and this is entered into a date field in 2 seperate tables a second apart (but still both display 25-Jun-2002 13:44 if queried) the 2 will still not be equal? -Original Message- From: Kipp, James [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 25, 2002 11:20 AM To: DBI-Users Subject: RE: Inserting formatted Date What is the data type for the field into which you are inserting the date? If it's a DATE field, you do the formatting when you retrieve the value, not when you set it. If it's not a DATE field, it should be. the data type is 'date'. I wanted to format it as i insert because the field is a key on 2 tables i will be querying on (so the date/time should be =)? i guess the question would then be how does oracle store the date ? meaning if it is formatted then stored, does oracle still store it like 6/25/2002 1:18:14 PM anyway.
Re: Inserting formatted Date
On Tue, Jun 25, 2002 at 01:19:34PM -0400, Kipp, James wrote: What is the data type for the field into which you are inserting the date? If it's a DATE field, you do the formatting when you retrieve the value, not when you set it. If it's not a DATE field, it should be. the data type is 'date'. I wanted to format it as i insert because the field is a key on 2 tables i will be querying on (so the date/time should be =)? i guess the question would then be how does oracle store the date ? meaning if it is formatted then stored, does oracle still store it like 6/25/2002 1:18:14 PM anyway. The DATE datatype in Oracle is stored in a special internal format. (Specifically, it's a floating point number representing the number of days since some point in time.) As I said before, the formatting only comes into play when you retrieve the value, not when you store it. If you want to use the same date/time in two tables, you should select SysDate from Dual first, and insert that value into both tables. Ronald
RE: Inserting formatted Date
The DATE datatype in Oracle is stored in a special internal format. (Specifically, it's a floating point number representing the number of days since some point in time.) As I said before, the formatting only comes into play when you retrieve the value, not when you store it. If you want to use the same date/time in two tables, you should select SysDate from Dual first, and insert that value into both tables. Ok, that answers my question!! so would i just capture the literal value from the select and insert that value into both tables? Thanks Ronald !!
RE: Inserting formatted Date
IF you insert into a table using the to_date function, Oracle uses that
function to make the calculation and converts it to a number. So, if you
used the function to_date('01-01-2002', 'dd-mm-') this would be the same
as to_date('Jan 01, 2002', 'Mon dd, '). If you start adding times in to
get more complicated, but you get the idea.
-Bruce
-Original Message-
From: Kipp, James [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 25, 2002 12:10 PM
To: Powell, Bruce; DBI-Users
Subject: RE: Inserting formatted Date
Oracle stores the date as a number. This works out as the
number of seconds
from a significant date (in Oracle's mind). Therefore, you
must send it as
a date (or number). The to_char function returns the character
representation of the number stored in the field.
so then it does not matter how i format it before when i insert it? what i
mean if i insert a date that is formatted to 25-Jun-2002 13:44(no seconds)
and this is entered into a date field in 2 seperate tables a second apart
(but still both display 25-Jun-2002 13:44 if queried) the 2 will still not
be equal?
-Original Message-
From: Kipp, James [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 25, 2002 11:20 AM
To: DBI-Users
Subject: RE: Inserting formatted Date
What is the data type for the field into which you are
inserting the date?
If it's a DATE field, you do the formatting when you retrieve
the value,
not when you set it. If it's not a DATE field, it should be.
the data type is 'date'. I wanted to format it as i insert
because the field
is a key on 2 tables i will be querying on (so the date/time
should be =)? i
guess the question would then be how does oracle store the
date ? meaning
if it is formatted then stored, does oracle still store it
like 6/25/2002
1:18:14 PM anyway.
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Re: Inserting formatted Date
On Tue, Jun 25, 2002 at 02:09:56PM -0400, Kipp, James wrote: Oracle stores the date as a number. This works out as the number of seconds from a significant date (in Oracle's mind). Therefore, you must send it as a date (or number). The to_char function returns the character representation of the number stored in the field. so then it does not matter how i format it before when i insert it? what i mean if i insert a date that is formatted to 25-Jun-2002 13:44(no seconds) and this is entered into a date field in 2 seperate tables a second apart (but still both display 25-Jun-2002 13:44 if queried) the 2 will still not be equal? You do not need to format the date at all when you insert it. If you store the date 25-Jun-2002 13:44 in two tables, the two *will* be equal. It doesn't matter what time it is in the real world when you insert the fixed date. Ronald
Re: MS Access
Orlando Andico wrote: It IS possible to read MSAccess files on a Linux box. http://mdbtools.sourceforge.net/ Hmm, I had no idea that was available, forget my advice about saving the Access files as CSV. At first glance it looks like it would be trivial to build an AnyData::Format::Access.pm using mdbtools which would then provide direct DBI interface to the MDB files. If anyone is interested in doing this, let me know and I'll help. -- Jeff
Re: MS Access
With the freetds drivers you can connect directly from solaris to an MS-Access database. I have done it many times and if you search on google there is a webpage that tells how to do it. keith Jeff Zucker wrote: Orlando Andico wrote: It IS possible to read MSAccess files on a Linux box. http://mdbtools.sourceforge.net/ Hmm, I had no idea that was available, forget my advice about saving the Access files as CSV. At first glance it looks like it would be trivial to build an AnyData::Format::Access.pm using mdbtools which would then provide direct DBI interface to the MDB files. If anyone is interested in doing this, let me know and I'll help. -- - Keith Clay, [EMAIL PROTECTED] Lead Programmer, Web Integration and Programming 286 Adams Center for Teaching Excellence Abilene Christian University Abilene, TX 79699 (915) 674-2187 (915) 674-2834 -
Re: MS Access
Actually since MDB Tools is also an ODBC driver, you could probably use DBD::ODBC as well. Although to be honest, the SQL engine and ODBC driver have a number of nasty bugs. I haven't tried this arrangement myself, so buyer beware. Brian On 25 Jun 2002, Jeff Zucker wrote: Orlando Andico wrote: It IS possible to read MSAccess files on a Linux box. http://mdbtools.sourceforge.net/ Hmm, I had no idea that was available, forget my advice about saving the Access files as CSV. At first glance it looks like it would be trivial to build an AnyData::Format::Access.pm using mdbtools which would then provide direct DBI interface to the MDB files. If anyone is interested in doing this, let me know and I'll help.
