Thread: 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
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)
On Mon, May 21, 2001 at 07:39:06PM +0530, Gurudutt wrote: > 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 > > 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. suffers? What's suffers? It's slower? It doesn't work at all? What? Looking at it, I'd guess that you get something about lack of GROUPing when using an aggregate, right? So, you'll need to use correct SQL to express the summation your trying to achieve. I don't have your schema, nor the time to reverse engineer it from your example query, but if what your expecting back from that is 31 rows in order, each one representing the total invoices due on that day, you need to add: GROUP BY BY ACT_InvoiceTab.InvGenDate just before the ORDER BY line Or, if you want the summation of all of them, and only expect one number back, why are you ORDERing it? > > 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 Again, vague. What "doesn't work so well" ? What is PEAR? Hmm, seems to be some PHP specific thing. I guess I'll let PHP PostgreSQL people answer this one. > > > Any help on all these issues will be greatly appreciated. I am in the > midst of a porject porting exercise. > Hope I helped. Ross