[R] Passing bigint (8-byte) values from Postgres to R using RPostgreSQL

From: psql2555 <postgresql.10.miller_2555_at_spamgourmet.com>
Date: Fri, 28 Nov 2008 00:15:20 -0800 (PST)

Hi -

I have a simple R script that inserts values into a Postgres table to generate a record that autogenerates a bigint unique ID (basically, a customized bigserial value). When I query the table to retrieve the bigint value, the value returned is not the same as the value created in the database (as evidenced by a direct query of the database table via pgAdmin).

e.g. the value created should be an 8-byte integer (specifically 2007111600000100000). However, the value returned in R is different (specifically 2007111600000100096). For every bigint value, the value returned is the value generated by the database + 96.

An example of the code to obtain the value from the database is as follows:



PgSQLdrv <- dbDriver("PostgreSQL")
con <-
dbConnect(PgSQLdrv,host="localhost",dbname="MyDB",user="user",password="password",port=5432) rs <- dbSendQuery(con,statement = paste('SELECT "UID" FROM "mytable" LIMIT 1',sep='',collapse=''))
val <- fetch(rs,n = -1)

How may I correct the error? Is this an endian issue with the Windows driver?

Running:

    Postgres v8.3.5
    R v2.8.0
    RPostgreSQL v0.1-2
    Windows XP SP2

Thanks -

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Received on Fri 28 Nov 2008 - 08:28:16 GMT

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