On Oct 9, 2010, at 9:02 AM, johannes rara wrote:
Thanks, but I'm not looking for a function to save dataframes into a
RDBMS. I'm looking for a function which creates CREATE TABLE and
INSERT statements from a dataframe.
(My first comment is speculation that Eric was intending that you look
at the _code_ of sqlSave rather than on its output. My reading of the
code (at the console rather than the source) suggests that it is
constructing the code and passing it to the external drivers.)
Looking at the web documentation linked from sqldf()'s help page, it
appears that at least part of this could also addressed by example 9
of the current full documentation:
http://code.google.com/p/sqldf/
BOD is a built-in dataframe:
require(sqldf)
?sqldf
# Portion of example 9:
> sqldf("pragma table_info(BOD)")
cid name type notnull dflt_value pk
1 0 Time REAL 0 <NA> 0
2 1 demand REAL 0 <NA> 0
>
> sqldf(c("select * from BOD", "select * from sqlite_master"))
type name tbl_name rootpage
1 table BOD BOD 2
sql
1 CREATE TABLE `BOD` \n( "Time" REAL,\n\tdemand REAL \n)
There is integration with a variety of SQL db's, although the act of
table creation may be limited to SQLite, since the primary advertised
activity is SELECT statements and it does its access through the
SQLite drive in memory ... at least as I understand it.
--
David.
-J
2010/10/5 Eric Lecoutre <ericlecou...@gmail.com>:
Hi,
You can have a look at RODBC and its function sqlSave.
HTH,
Eric
2010/10/3 johannes rara <johannesr...@gmail.com>
Hi,
R contains many good datasets which would be valuable in other
platforms as well. My intention is to use R datasets on SQL Server
as
a sample tables. Is there a package that would do automatic
conversion
from the dataset "schema" into a SQL Server CREATE TABLE statement
(and INSERT INTO statements)?
For example.
str(cars)
'data.frame': 50 obs. of 2 variables:
$ speed: num 4 4 7 7 8 9 10 10 10 11 ...
$ dist : num 2 10 4 22 16 10 18 26 34 17 ...
would become
create table dbo.cars (
id int identity(1,1) not null,
speed int not null,
dist int not null,
constraint PK_id primary key clustered (id ASC)
on [PRIMARY]
)
insert into dbo.cars
values (N'4', N'2'),
(N'4', N'10'),
(N'7', N'4'),
etc.
-J
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--
Eric Lecoutre
Consultant - Business & Decision
Business Intelligence & Customer Intelligence
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David Winsemius, MD
West Hartford, CT
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