R devel - Dec 2006 - bug in sqlSave with fast=F option (PR#9429)

Full_Name: Paul MacManus
Version: 2.3.0
OS: Windows XP
Submission from: (NULL) (216.90.169.253)


See also R-help thread for October 18, 2006

---------------------------
Create a dataframe and save it to a database table "test" as follows:

df <- data.frame(T=1, S=10)
sqlSave(channel, df, "test", rownames=F)

The table now looks like

T  S
1  10

If I create another dataframe and save as follows

df <- data.frame(S=20, T=2)
sqlSave(channel, df, "test", rownames=F, append=T)

Then table "test" now looks like

T  S
1  10
2  20

The important point is that although S was the first column of df,
sqlSave checked the column names and matched the corresponding columns
of df and table "test".

However, if I now create another dataframe and save it using the
fast=F option as follows

df <- data.frame(S=30, T=3)
sqlSave(channel, df, "test", rownames=F, append=T, fast=F)

the table test now looks like

T  S
1  10
2  20
30 3

In other words, sqlSave didn't check column names, it simply mapped
column 1 to column 1 and column 2 to column 2.
-------------------------

I'm using R 2.3.0 and package RODBC 1.1-7 on Windows XP with MS SQL Server

Please read how to report bugs:

1. sqlSave is not part of R's base packages, hence please do not submit 
a bug report here but ask the package maintainer of the corresponding 
package.
2. You have tested with an outdated version of R (2.4.1 is recent).


Uwe Ligges


paul.macmanus at gmail.com wrote:
> Full_Name: Paul MacManus
> Version: 2.3.0
> OS: Windows XP
> Submission from: (NULL) (216.90.169.253)
> 
> 
> See also R-help thread for October 18, 2006
> 
> ---------------------------
> Create a dataframe and save it to a database table "test" as
follows:
> 
> df <- data.frame(T=1, S=10)
> sqlSave(channel, df, "test", rownames=F)
> 
> The table now looks like
> 
> T  S
> 1  10
> 
> If I create another dataframe and save as follows
> 
> df <- data.frame(S=20, T=2)
> sqlSave(channel, df, "test", rownames=F, append=T)
> 
> Then table "test" now looks like
> 
> T  S
> 1  10
> 2  20
> 
> The important point is that although S was the first column of df,
> sqlSave checked the column names and matched the corresponding columns
> of df and table "test".
> 
> However, if I now create another dataframe and save it using the
> fast=F option as follows
> 
> df <- data.frame(S=30, T=3)
> sqlSave(channel, df, "test", rownames=F, append=T, fast=F)
> 
> the table test now looks like
> 
> T  S
> 1  10
> 2  20
> 30 3
> 
> In other words, sqlSave didn't check column names, it simply mapped
> column 1 to column 1 and column 2 to column 2.
> -------------------------
> 
> I'm using R 2.3.0 and package RODBC 1.1-7 on Windows XP with MS SQL
Server
> 
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