Re: How to ensure column names are double quoted while using execute format when building a stored procedure?

["David G. Johnston" <david.g.johnston@xxxxxxxxx>]

On Thu, Dec 16, 2021 at 1:21 PM Shaozhong SHI <shishaozhong@xxxxxxxxx> wrote:

The following command runs but does not produce results as expected.

 

Execute Format('insert into stats select %L as id, %2$L as checks, count(%3$s) from %4$s where %5$s is null', i, 'count of nulls in '||col, col, t_name, col);

All columns have got capital letters in.  How to ensure that the columns are double-quote when they are fed in as variables.

Quoting the relevant doc section:

https://www.postgresql.org/docs/current/functions-string.html#FUNCTIONS-STRING-FORMAT

type (required)

The type of format conversion to use to produce the format specifier's output. The following types are supported:

s formats the argument value as a simple string. A null value is treated as an empty string.

I treats the argument value as an SQL identifier, double-quoting it if necessary. It is an error for the value to be null (equivalent to quote_ident).

L quotes the argument value as an SQL literal. A null value is displayed as the string NULL, without quotes (equivalent to quote_nullable).

David J.