[HACKERS] number of affected tuples
hi im having a problem while using the PQcmdTuples(). Consider the following code snippet: there exists a table table1 (name character(30), age integer) ...snip... PGresult *res = PQexec(prepare p_stmt (integer) update table1 set age = age + 1 where age = $1); PQclear (res); res = PQexec ( execute p_stmt (10)); coutPQcmdTuples (res); ...snip... the PQcmdTuples() returns a null string. The doc says it returns number of affected tuples if the statement is INSERT, UPDATE or DELETE. This apparently doesn't include statements. Now consider this... nameage - a1 b2 update table1 set age=age + 1 where age = 3; this does not return an error even though no tuples were were affected. Now my problem is this. either 1 i need the number of affected rows in the update operation OR 2 i need to get whether the update did or did not affect a tuple (no tuple was matched by the where clause). In my case, at max, 1 tuple will be affected. any of these will solve the problem thanx in advance rahul ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[HACKERS] no of affected rows in prepared stmts
hi whenever i call an execute on a prepared statement, i get the return value of PQcmdTuples() as NULL even if the query did modify tuples... how can i get the number of affected tuples? thanx in adv. rahul ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[HACKERS] Speeding up operations
hi... im on a project using Postgres. The project involves, at times, upto 5,000,000 inserts. I was checking the performance of Postgres for 5M inserts into a 2 column table (one col=integer, 2nd col=character). I used the Prepare... and execute method, so i basically had 5M execute statements and 1 prepare statement. Postgres took 144min for this... is there any way to improve this performance? if so, how? btw, im using it on a SPARC/Solaris 2.6. thanx in adv rahul P.S: Kindly point me towards any relevant documentation as well. ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
[HACKERS] Batch Operations
hi, im currently working on a project that requires batch operations - eg. Batch insert/update etc. The database im using is PostgreSQL. However, i cannot find any documentation for batch opeartions on PostgreSQL. Does anyone know how to do this, or if it is possible? Thanx in advance regards rahul ---(end of broadcast)--- TIP 8: explain analyze is your friend
