Re: Proposing an API for the extension for simplifying database connections
Feel free to create a DBD::DBH or somesuch.
Tim.
p.s. Best not to cross-post dbi-users and dbi-dev. This sort of 'requirements
spec'
discussion is best on dbi-users as they would be your customers.
On Thu, Jan 13, 2005 at 12:40:49AM -0600, David Nicol wrote:
That's what DBI wrappers do, and I have one of those too. But my DBI
wrapper reads its connection information for each logical data source
from
a hash. Then there's a build_dsn() method that assembles the pieces
according to the name of the driver.
If each DBD did that for me, I could just pass a reference to my
connection
info hash directly to DBI-connect() and then remove the build_dsn() code
from my wrapper.
Assuming that each DBD used the same names for elements with the same
meaning
(database vs dbname vs db vs sid etc etc).
Tim.
mandating a new method for all compliand DBDs is, as ever, outrageeous.
Here's a proposed compromise: A new DBD that takes the elements of
the attributes hash, and at connect time this DBD will build the DSN (or
croak and complain explicitly about what is missing in a well defined way)
and return a real $dbh resulting from calling DBI-connect with the build DSN.
DBI doc tells us:
$dbh = DBI-connect($dsn, $user, $password,
{ RaiseError = 1, AutoCommit = 0 });
DBD::dsn (DBD::any? DBD::DBH?) would work like this:
$dbh = DBI-connect('DBI:DBH', $user, $password,
{ RaiseError = 1, AutoCommit = 0,
host = $dbhost, dbd = 'pg', port = $dbport });
That way, DBI-connect doesn't need to be rewritten to allow a hash -- it
already allows the %attr hash -- and the intermediate DSN created by
the build_dsn method is hidden away in the inner workings.
Am I missing something?
Proposing an API for the extension for simplifying database connections
That's what DBI wrappers do, and I have one of those too. But my DBI
wrapper reads its connection information for each logical data source from
a hash. Then there's a build_dsn() method that assembles the pieces
according to the name of the driver.
If each DBD did that for me, I could just pass a reference to my connection
info hash directly to DBI-connect() and then remove the build_dsn() code
from my wrapper.
Assuming that each DBD used the same names for elements with the same meaning
(database vs dbname vs db vs sid etc etc).
Tim.
mandating a new method for all compliand DBDs is, as ever, outrageeous.
Here's a proposed compromise: A new DBD that takes the elements of
the attributes hash, and at connect time this DBD will build the DSN (or
croak and complain explicitly about what is missing in a well defined way)
and return a real $dbh resulting from calling DBI-connect with the build DSN.
DBI doc tells us:
$dbh = DBI-connect($dsn, $user, $password,
{ RaiseError = 1, AutoCommit = 0 });
DBD::dsn (DBD::any? DBD::DBH?) would work like this:
$dbh = DBI-connect('DBI:DBH', $user, $password,
{ RaiseError = 1, AutoCommit = 0,
host = $dbhost, dbd = 'pg', port = $dbport });
That way, DBI-connect doesn't need to be rewritten to allow a hash -- it
already allows the %attr hash -- and the intermediate DSN created by
the build_dsn method is hidden away in the inner workings.
Am I missing something?
Re: Proposing an API for the extension for simplifying database connections
On Thu, 13 Jan 2005 00:40:49 -0600, David Nicol [EMAIL PROTECTED] wrote: Am I missing something? Yes, to convince, at least me. I still don't understand, what this should be good for. If it is fine for you, with a limited number of drivers supported, then you may very well use it. You may as well write a DBIx extension or do whatever you want. For example, this could easily be implemented as a DBI subclass with a slightly different connect method. However, in general, the DBI is based on the DSN as a string with almost no syntactical rules. Drivers have used this liberty, with good reasons. Why leave this at all? Jochen -- Sum. Cogitone?
joins and the DBD::CSV module
I am trying to do a join across to csv files but have been unsuccessful
up to this point.
I have two tables:
tab1.csv
TAB_ONE_ID,NAME,TAB_TWO_ID
1,row1,100
2,row2,200
tab2.csv
TAB_TWO_ID,CATEGORY
100,cat1
200,cat2
I am running the following query:
select TAB_ONE.NAME,TAB_TWO.CATEGORY
from TAB_ONE, TAB_TWO
where TAB_ONE.TAB_TWO_ID = TAB_TWO.TAB_TWO_ID
I expect the following:
row1, cat1
row2, cat2
I get the following:
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 554, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 554, GEN1 line 1.
Use of uninitialized value in string eq at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 556, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 562, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 562, GEN1 line 1.
Use of uninitialized value in array element at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 891, GEN0 line 3.
Use of uninitialized value in array element at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 891, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
1, 1
1, 1
2, 2
2, 2
platform:
OS: Linux 2.6.8-1-686 #1 Thu Nov 25 04:34:30 UTC 2004 GNU/Linux
Perl: This is perl, v5.8.4 built for i386-linux-thread-mult
DBD::CSV: 0.21
SQL::Statement: 1.09
here is the script
--- snip ---
#! /usr/bin/perl -w
use DBI;
$dbh = DBI-connect(DBI:CSV:f_dir='.',
{'select' = {'join' = 1}})
or die Cannot connect: . $DBI::errstr;
$dbh-{'csv_tables'}-{'TAB_ONE'} = { 'file' = 'tab1.csv'};
$dbh-{'csv_tables'}-{'TAB_TWO'} = { 'file' = 'tab2.csv'};
$dbh-{'csv_eol'} = \n;
my $sth = $dbh-prepare(select TAB_ONE.NAME,TAB_TWO.CATEGORY
from TAB_ONE, TAB_TWO
where TAB_ONE.TAB_TWO_ID =
TAB_TWO.TAB_TWO_ID);
$sth-execute();
while ( @row = $sth-fetchrow_array ) {
$row[length @row] = '' if(! defined $row[length @row]);
print join(', ', @row), \n;
}
$sth-finish();
$dbh-disconnect();
--- snip ---
Can anyone help me.
New in DBI
Hi all, I'm new in DBI and I'm really stuck, some can explain me this code: use DBI; my $dbh = DBI-connect( 'dbi:Oracle:db', '$username', '$passwd', ) or die $DBI::errstr; EOF its supposed I get a connection with that ? 'dbi:Oracle:db' - this is the driver and the database associated, where I can config the host where the Oracle DB resides ? Please excuse if my question is stupid but I search in the docs and nothing about this is explained Hernan Dario A. -- No matter how fast processors get, software consistently finds new ways to eat up the extra speed
RE: New in DBI
Please read the DBD::Oracle docs http://search.cpan.org/~timb/DBD-Oracle-1.16/Oracle.pm - Ron Reidy Lead DBA Array BioPharma, Inc. -Original Message- From: Hernan Arredondo [mailto:[EMAIL PROTECTED] Sent: Thursday, January 13, 2005 12:11 PM To: dbi-users@perl.org Subject: New in DBI Hi all, I'm new in DBI and I'm really stuck, some can explain me this code: use DBI; my $dbh = DBI-connect( 'dbi:Oracle:db', '$username', '$passwd', ) or die $DBI::errstr; EOF its supposed I get a connection with that ? 'dbi:Oracle:db' - this is the driver and the database associated, where I can config the host where the Oracle DB resides ? Please excuse if my question is stupid but I search in the docs and nothing about this is explained Hernan Dario A. -- No matter how fast processors get, software consistently finds new ways to eat up the extra speed This electronic message transmission is a PRIVATE communication which contains information which may be confidential or privileged. The information is intended to be for the use of the individual or entity named above. If you are not the intended recipient, please be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. Please notify the sender of the delivery error by replying to this message, or notify us by telephone (877-633-2436, ext. 0), and then delete it from your system.
RE: New in DBI
Hernan: In your string 'dbi:Oracle:db', the characters 'db' need to be replaced with your Oracle SID. For example, if your database's SID is 'TEST' (e.g.: you connect to the database with sqlplus system/[EMAIL PROTECTED]), then your code should read 'dbi:Oracle:TEST'. HTH, Mike -Original Message- From: Hernan Arredondo [mailto:[EMAIL PROTECTED] Sent: Thursday, January 13, 2005 11:11 AM To: dbi-users@perl.org Subject: New in DBI Hi all, I'm new in DBI and I'm really stuck, some can explain me this code: use DBI; my $dbh = DBI-connect( 'dbi:Oracle:db', '$username', '$passwd', ) or die $DBI::errstr; EOF its supposed I get a connection with that ? 'dbi:Oracle:db' - this is the driver and the database associated, where I can config the host where the Oracle DB resides ? Please excuse if my question is stupid but I search in the docs and nothing about this is explained Hernan Dario A. -- No matter how fast processors get, software consistently finds new ways to eat up the extra speed
Re: New in DBI
Great, was a stupid question thanks... On Thu, 13 Jan 2005 11:20:04 -0800, Vergara, Michael (TEM) [EMAIL PROTECTED] wrote: Hernan: In your string 'dbi:Oracle:db', the characters 'db' need to be replaced with your Oracle SID. For example, if your database's SID is 'TEST' (e.g.: you connect to the database with sqlplus system/[EMAIL PROTECTED]), then your code should read 'dbi:Oracle:TEST'. HTH, Mike -Original Message- From: Hernan Arredondo [mailto:[EMAIL PROTECTED] Sent: Thursday, January 13, 2005 11:11 AM To: dbi-users@perl.org Subject: New in DBI Hi all, I'm new in DBI and I'm really stuck, some can explain me this code: use DBI; my $dbh = DBI-connect( 'dbi:Oracle:db', '$username', '$passwd', ) or die $DBI::errstr; EOF its supposed I get a connection with that ? 'dbi:Oracle:db' - this is the driver and the database associated, where I can config the host where the Oracle DB resides ? Please excuse if my question is stupid but I search in the docs and nothing about this is explained Hernan Dario A. -- No matter how fast processors get, software consistently finds new ways to eat up the extra speed -- No matter how fast processors get, software consistently finds new ways to eat up the extra speed
RE: New in DBI
Hernan Arredondo [mailto:[EMAIL PROTECTED] wrote: Hi all, I'm new in DBI and I'm really stuck, some can explain me this code: use DBI; my $dbh = DBI-connect( 'dbi:Oracle:db', '$username', '$passwd', ) or die $DBI::errstr; EOF Aside from the SID issue, you have single quotes around $username and $passwd, which means you are passing those literal strings as the username and password, rather than the contents of the variables. You don't need quotes at all around individual variables: my $dbh = DBI-connect( 'dbi:Oracle:db', $username, $passwd, ) or die $DBI::errstr; (with the correct SID still needing to be inserted) Ronald
DBD::CSV and joins
Sorry if I posted this twice - I did not see my first post go through.
I am trying to do a join across to csv files but have been unsuccessful
up to this point.
I have two tables:
tab1.csv
TAB_ONE_ID,NAME,TAB_TWO_ID
1,row1,100
2,row2,200
tab2.csv
TAB_TWO_ID,CATEGORY
100,cat1
200,cat2
I am running the following query:
select TAB_ONE.NAME,TAB_TWO.CATEGORY
from TAB_ONE, TAB_TWO
where TAB_ONE.TAB_TWO_ID = TAB_TWO.TAB_TWO_ID
I expect the following:
row1, cat1
row2, cat2
I get the following:
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 553, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 554, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 554, GEN1 line 1.
Use of uninitialized value in string eq at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 556, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 560, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 562, GEN1 line 1.
Use of uninitialized value in concatenation (.) or string at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 562, GEN1 line 1.
Use of uninitialized value in array element at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 891, GEN0 line 3.
Use of uninitialized value in array element at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 891, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
Use of uninitialized value in array slice at
/usr/local/share/perl/5.8.4/SQL/Statement.pm line 898, GEN0 line 3.
1, 1
1, 1
2, 2
2, 2
platform:
OS: Linux 2.6.8-1-686 #1 Thu Nov 25 04:34:30 UTC 2004 GNU/Linux
Perl: This is perl, v5.8.4 built for i386-linux-thread-mult
DBD::CSV: 0.21
SQL::Statement: 1.09
here is the script
--- snip ---
#! /usr/bin/perl -w
use DBI;
$dbh = DBI-connect(DBI:CSV:f_dir='.',
{'select' = {'join' = 1}})
or die Cannot connect: . $DBI::errstr;
$dbh-{'csv_tables'}-{'TAB_ONE'} = { 'file' = 'tab1.csv'};
$dbh-{'csv_tables'}-{'TAB_TWO'} = { 'file' = 'tab2.csv'};
$dbh-{'csv_eol'} = \n;
my $sth = $dbh-prepare(select TAB_ONE.NAME,TAB_TWO.CATEGORY
from TAB_ONE, TAB_TWO
where TAB_ONE.TAB_TWO_ID =
TAB_TWO.TAB_TWO_ID);
$sth-execute();
while ( @row = $sth-fetchrow_array ) {
$row[length @row] = '' if(! defined $row[length @row]);
print join(', ', @row), \n;
}
$sth-finish();
$dbh-disconnect();
--- snip ---
Can anyone help me.
RE: Which ORACLE_HOME was used to build DBD?
[EMAIL PROTECTED] Oracle]# pwd
/usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/DBD/Oracle
[EMAIL PROTECTED] Oracle]# head mk.pm
$dbd_oracle_mm_opts = {
'NAME' = 'DBD::Oracle',
'INC' = '-I/u01/app/oracle/10.1/rdbms/demo
-I/u01/app/oracle/10.1/rdbms/public -I/u01/app/oracle/10.1/plsql/public
-I/u01/app/oracle/10.1/network/public -I/u01/app/oracle/10.1/rdbms/demo
-I/u01/app/oracle/10.1/plsql/public -I/u01/app/oracle/10.1/rdbms/public
-I/usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/DBI/',
'AUTHOR' = 'Tim Bunce (dbi-users@perl.org)',
--
Andy Hassall [EMAIL PROTECTED] / Space: disk usage analysis tool
http://www.andyh.co.uk / http://www.andyhsoftware.co.uk/space
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 12 January 2005 11:39
To: dbi-users@perl.org
Subject: Which ORACLE_HOME was used to build DBD?
Hi All,
I have a Redhat box with 2 ORACLE_HOMEs. DBI and DBD_Oracle
have both
been installed.
How can I tell which ORACLE_HOME was used to build the DBD?
Cheers
Tony
