Re: Postgresql 9.5 and Shell scripts/variables vs. C programming/defining a value to be used

[Poul Kristensen <bcc5226@xxxxxxxxx>]

Solution:

 

C is able to compile with an embedded shell script. 

So a small C program with an argument being the user passed to the shell script it succeded succesfully.

I am aware that it could be my question was not specifically relevant to Postgresql! :)

It took a while to solve. :)

Thanks

Poul 

2016-11-23 21:31 GMT+01:00 Poul Kristensen <bcc5226@xxxxxxxxx>:

My goal is to grap a user from the OS and and substitute the grapped user - to be the owner of the database - in the sql commands

e.g using shell-script substitution syntax: 

       create user ${user} with login; 

       create tablespace ${user} location '/path/${user)'; 

       create database ${user} owner ${user} on tablespace ${user};

I would be surpriced if this should not be possible using gnu gcc but I might be wrong. It is just a question of figurering out way to do this. 

http://zetcode.com/db/postgresqlc/ has an example of how to do this using integer as argument on 

the commandline.

Do you have a hint of the substitution syntax to be used in gnu gcc.

Thanks.

/Poul

2016-11-23 16:44 GMT+01:00 Tom Lane <tgl@xxxxxxxxxxxxx>:

"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes:
> On Wed, Nov 23, 2016 at 3:46 AM, Poul Kristensen <bcc5226@xxxxxxxxx> wrote:
>> In the postgresql.log I get "select datname from $1".

> ​That is expected when you parameterize a query - the query string includes
> parameter​s instead of values.

It looks like Poul is hoping to use a parameter as a table name,
which doesn't work.  Parameters can only represent values (constants).

                        regards, tom lane

--

Med venlig hilsen / Best regards
Poul Kristensen
Linux-OS/Virtualizationexpert and Oracle DBA

--

Med venlig hilsen / Best regards
Poul Kristensen
Linux-OS/Virtualizationexpert and Oracle DBA