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Re[2]: [INTERFACES] PSQLODBC and TRANSACTIONS

From: Sferacarta Software <sferac(at)bo(dot)nettuno(dot)it>
To: Byron Nikolaidis <byronn(at)insightdist(dot)com>, "pgsql-interfaces(at)postgreSQL(dot)org" <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re[2]: [INTERFACES] PSQLODBC and TRANSACTIONS
Date: 1999-01-13 13:44:28
Message-ID: 18614.990113@bo.nettuno.it (view raw or flat)
Thread:
Lists: pgsql-interfaces
Hello Byron,

martedì, 12 gennaio 99, you wrote:



BN> Jose' Soares wrote:

>> Hi,
>>
>> I'm trying transactions using M$-access and PSQLODBC without success,
>> Seems that backend locks itself
>> by opening two connections to work on the same table.
>>
>> I have a table with 3 rows:
>>
>> codice  nome            cap
>> ---------------------------
>> 1       pippo           0
>> 2       pluto           0
>> 3       topolino        0
>> ---------------------------
>>

BN> The logfile shows that Access is using Manual Commit.   The last two lines show a separate connection
BN> being made and then a select statement on "operatori" table.  But it is still locked from the other
BN> connection.  (see below)

BN> I don't think there is anything the driver can do about this.  You need Vladim's new locking code!   I
BN> think that is going to be in the next version of Postgres.

BN> Byron

BN> <Highlights from the logfile>
BN> BEGIN
BN> UPDATE "operatori" SET "cap"='1' WHERE "codice" = '1  '
BN> SELECT "codice","cap"  FROM "operatori"  WHERE "codice" = '3  '
BN> UPDATE "operatori" SET "cap"='1' WHERE "codice" = '3  '
BN> SELECT "codice","cap"  FROM "operatori"  WHERE "codice" = '2  '
BN> UPDATE "operatori" SET "cap"='1' WHERE "codice" = '2  '

BN> <Another connection is created here>
BN> SQLDriverConnect(out)='DSN=PostgreSQL;DATABASE=hygea;SERVER=verde;PORT=5432;UID=marco;PWD=;READONLY=0;PROTOCOL=6.4;FAKEOIDINDEX=0;SHOWOIDCOLUMN=0;ROWVERSIONING=0;SHOWSYSTEMTABLES=0;CONNSETTINGS=set+ksqo+to+%27on%27%3b'

BN> <This one hangs it>
BN> SELECT "operatori"."codice" FROM "operatori"

Thank you for reply Byron.

I hope that v6.5 may solve my problem.

-Jose'-



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