> On 6/9/17, Zach C. <[email protected]> wrote:
> > I was partially unclear with using a constant table name here; what I
> > actually need as well is the table name as effectively a const that I
> > control as well. So more like
> >
> > mydb eval {$SELECT json FROM $table WHERE json_extract(json, '$.hash') =
> > $someId}
>
> Like this then:
>
> mydb eval "SELECT json FROM $table WHERE
> json_extract(json,'\$.hash')=\$someId"
>
> Put a backslash \ before every $ that you want passed down into
> SQLite. And not that you definitely want the $ on $someId passed down
> into SQLite. You do *not* want TCL to expand $someId for you.
How about using the :-form of variable references ?
mydb eval "SELECT json FROM $table WHERE
json_extract(json,':.hash')=:someId"
Tcl will ignore that form, and Sqlite will expand them.
A bit less of quoting hell.
Another alternative:
set map [list <<table> $table]
mydb eval [string map $map {
SELECT json
FROM <<table>>
WHERE json_extract(json,'$.hash')=$someId
}]
I.e. explicit interpolation of a chosen placeholder, here <<table>>,
via [string map], and putting the statement again into {} to prevent
Tcl from doing variable expansion.
--
See you,
Andreas Kupries <[email protected]>
<http://core.tcl.tk/akupries/>
Developer @ SUSE (MicroFocus Canada LLC)
<[email protected]>
Tcl'2017, Oct 16-20, Houston, TX, USA. http://www.tcl.tk/community/tcl2017/
EuroTcl 2017, Jul 8-9, Berlin/DE, http://www.eurotcl.tcl3d.org/
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