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Thread: Need Help!!

Need Help!!

From
Gurudutt
Date:
Hello pgsql-sql,

  I am the new member for the postgres mailing list. Actually I have
  been working with mysql, php and perl for a very long time now, and
  offlate shifted to pgsql. I have many technical difficulties

  1. I need to port mysql data to pgsql. I tried both mysql2pg.pl and
  my2pg.sql. Both have some problem. I think it is got something to do
  with the auto increment feature that i used in mysql. Can that issue
  be addressed while porting.

  2. Some of the joins that were successfully working in mysql are not
  working, most importantly LEFT JOIN.

eg.

SELECT SUM(ACT_DueTab.CableAmount) as NetworkTotal FROM
ACT_NetworkTab,ACT_DueTab, ACT_InvoiceTab LEFT JOIN ACT_CustomerTab ON
(ACT_CustomerTab.CustCode=ACT_InvoiceTab.CustCode) WHERE
ACT_DueTab.InvCode=ACT_InvoiceTab.InvNumber and
ACT_NetworkTab.NetCode=3 and
ACT_CustomerTab.NetCode=ACT_NetworkTab.NetCode and
(ACT_InvoiceTab.InvGenDate <= '2001-08-31' and
ACT_InvoiceTab.InvGenDate >= '2001-08-01')
ORDER BY ACT_InvoiceTab.InvGenDate DESC

This query works fine in mysql, but suffers in pgsql.

3. I was using PEAR for data abstraction layer ( to make code
independent of the database), I find that PEAR which worked fine with
mysql doesn't work so well with pgsql


Any help on all these issues will be greatly appreciated. I am in the
midst of a porject porting exercise.


--
Best regards,
 Gurudutt                          mailto:guru@indvalley.com

Life is not fair - get used to it.
Bill Gates

Re: Need Help!!

From
"Heather Johnson"
Date:
Hi Gurudutt--

Concerning #1, I had a similar problem when porting data from mysql to psql.
I finally ended up just using mysql's COPY command to get the data into
delimited text form, then imported that into psql using its COPY command.
This seems to me to be the easiest way to port over data if your table
structures are exactly the same. If they aren't, then I'd export the mysql
data to delimited text anyway, and write a quick script to import it into a
structurally distinct psql table.

I don't have any good advice for the other two difficulties you're
having---hopefully others on the list can help.

Good luck.
Heather

----- Original Message -----
From: "Gurudutt" <guru@indvalley.com>
To: <pgsql-sql@postgresql.org>
Cc: <pgsql-php@postgresql.org>
Sent: Monday, May 21, 2001 10:09 AM
Subject: [PHP] Need Help!!


> Hello pgsql-sql,
>
>   I am the new member for the postgres mailing list. Actually I have
>   been working with mysql, php and perl for a very long time now, and
>   offlate shifted to pgsql. I have many technical difficulties
>
>   1. I need to port mysql data to pgsql. I tried both mysql2pg.pl and
>   my2pg.sql. Both have some problem. I think it is got something to do
>   with the auto increment feature that i used in mysql. Can that issue
>   be addressed while porting.
>
>   2. Some of the joins that were successfully working in mysql are not
>   working, most importantly LEFT JOIN.
>
> eg.
>
> SELECT SUM(ACT_DueTab.CableAmount) as NetworkTotal FROM
> ACT_NetworkTab,ACT_DueTab, ACT_InvoiceTab LEFT JOIN ACT_CustomerTab ON
> (ACT_CustomerTab.CustCode=ACT_InvoiceTab.CustCode) WHERE
> ACT_DueTab.InvCode=ACT_InvoiceTab.InvNumber and
> ACT_NetworkTab.NetCode=3 and
> ACT_CustomerTab.NetCode=ACT_NetworkTab.NetCode and
> (ACT_InvoiceTab.InvGenDate <= '2001-08-31' and
> ACT_InvoiceTab.InvGenDate >= '2001-08-01')
> ORDER BY ACT_InvoiceTab.InvGenDate DESC
>
> This query works fine in mysql, but suffers in pgsql.
>
> 3. I was using PEAR for data abstraction layer ( to make code
> independent of the database), I find that PEAR which worked fine with
> mysql doesn't work so well with pgsql
>
>
> Any help on all these issues will be greatly appreciated. I am in the
> midst of a porject porting exercise.
>
>
> --
> Best regards,
>  Gurudutt                          mailto:guru@indvalley.com
>
> Life is not fair - get used to it.
> Bill Gates
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: you can get off all lists at once with the unregister command
>     (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)

Re: Need Help!!

From
"Papp Gyozo"
Date:
Hello,

next time post the error message what you got and your pgsql version number.
It helps us to find the weak point in the "whole mess".

JOIN syntax was introduced in v7.1 and some fixes was made up to the recent
version (v7.1.3), AFAIR.

SELECT SUM(ACT_DueTab.CableAmount) as NetworkTotal
 FROM ACT_NetworkTab,
      ACT_DueTab,
      ACT_InvoiceTab LEFT JOIN ACT_CustomerTab
--      ON (ACT_CustomerTab.CustCode=ACT_InvoiceTab.CustCode)
-- instead, and pg won't duplicate this column:
      USING(CustCode)
-- you might give a table alias for this JOIN and use it instead
-- I'm just guessing ...
WHERE
 ACT_DueTab.InvCode=ACT_InvoiceTab.InvNumber AND
 ACT_NetworkTab.NetCode=3 AND
 ACT_CustomerTab.NetCode=ACT_NetworkTab.NetCode AND
 ACT_InvoiceTab.InvGenDate <= '2001-08-31' AND
 ACT_InvoiceTab.InvGenDate >= '2001-08-01')
ORDER BY ACT_InvoiceTab.InvGenDate DESC

So:
SELECT SUM(ACT_DueTab.CableAmount) as NetworkTotal
 FROM ACT_NetworkTab,
      ACT_DueTab,
      (ACT_InvoiceTab LEFT JOIN ACT_CustomerTab
      USING(CustCode)) AS A
WHERE
 ACT_DueTab.InvCode=A.InvNumber AND
 ACT_NetworkTab.NetCode=3 AND
 A.NetCode=ACT_NetworkTab.NetCode AND
 A.InvGenDate <= '2001-08-31' AND
 A.InvGenDate >= '2001-08-01'
ORDER BY ACT_InvoiceTab.InvGenDate DESC

> 3. I was using PEAR for data abstraction layer ( to make code
> independent of the database), I find that PEAR which worked fine with
> mysql doesn't work so well with pgsql
>
Can you detail it a bit? What's wrong with PEAR or its abstraction?

----- Original Message -----
From: "Gurudutt" <guru@indvalley.com>
To: <pgsql-sql@postgresql.org>
Cc: <pgsql-php@postgresql.org>
Sent: Monday, May 21, 2001 4:09 PM
Subject: [PHP] Need Help!!


> Hello pgsql-sql,
>
>   I am the new member for the postgres mailing list. Actually I have
>   been working with mysql, php and perl for a very long time now, and
>   offlate shifted to pgsql. I have many technical difficulties
>
>   1. I need to port mysql data to pgsql. I tried both mysql2pg.pl and
>   my2pg.sql. Both have some problem. I think it is got something to do
>   with the auto increment feature that i used in mysql. Can that issue
>   be addressed while porting.
>
>   2. Some of the joins that were successfully working in mysql are not
>   working, most importantly LEFT JOIN.
>
> eg.
>
> SELECT SUM(ACT_DueTab.CableAmount) as NetworkTotal FROM
> ACT_NetworkTab,ACT_DueTab, ACT_InvoiceTab LEFT JOIN ACT_CustomerTab ON
> (ACT_CustomerTab.CustCode=ACT_InvoiceTab.CustCode) WHERE
> ACT_DueTab.InvCode=ACT_InvoiceTab.InvNumber and
> ACT_NetworkTab.NetCode=3 and
> ACT_CustomerTab.NetCode=ACT_NetworkTab.NetCode and
> (ACT_InvoiceTab.InvGenDate <= '2001-08-31' and
> ACT_InvoiceTab.InvGenDate >= '2001-08-01')
> ORDER BY ACT_InvoiceTab.InvGenDate DESC
>
> This query works fine in mysql, but suffers in pgsql.
>
> 3. I was using PEAR for data abstraction layer ( to make code
> independent of the database), I find that PEAR which worked fine with
> mysql doesn't work so well with pgsql
>
>
> Any help on all these issues will be greatly appreciated. I am in the
> midst of a porject porting exercise.
>
>
> --
> Best regards,
>  Gurudutt                          mailto:guru@indvalley.com
>
> Life is not fair - get used to it.
> Bill Gates
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: you can get off all lists at once with the unregister command
>     (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)