On Tue, 2012-05-29 at 18:32 -0400, Alan Gutierrez wrote:
> Surprised that this works:
> 
>      echo ":foo" | psql --variable foo="SELECT 1 AS FOO;"  template1
> 
> Why doesn't `psql` escape parameters passed in through `--variable`. When I 
> use
> a library in other languages, they will escape the variable.
> 
> How do I use `psql` from `bash` so that it will escape variables and thwart 
> SQL
> injection?

http://www.postgresql.org/docs/9.1/static/app-psql.html#APP-PSQL-VARIABLES

In particular, look at the section on SQL Interpolation. Hopefully that
answers your question.

Regards,
        Jeff Davis



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