Add a Render() function which returns a valid query

[chrismwendt]

Check this out:

q := sqlf.Sprintf("SELECT * FROM repos WHERE name = $1", "github.com/keegancsmith/sqlf")
fmt.Println(q.Render(sqlf.PostgresBindVar))

That prints this:

SELECT * FROM repos WHERE name = 'github.com/keegancsmith/sqlf'

Ready to copy-n-paste into psql, or EXPLAIN ANALYZE .... and print the timing info for local dev.

This was the bare minimum necessary to work for my pursposes, but there's a lot left to do in order to work in general for all BindVars, drivers, and argument types.

[keegancsmith]

I'm unsure about including this in the library, since people may use it to directly pass to SQL. We then need to be 100% sure it isn't escapable in all sql backends.

Alternatively we could include a Render(escape func(interface{}) string). We should be able to implement that cleanly directly using the fmt package (and avoid uses of strings.Replace/etc)

Is the purpose of this for observability somewhere?

[keegancsmith]

rather than pulling in the pq dependency, can you just do type check against interface{Value()(interface{}, error)}?

[chrismwendt]

Good idea 💡

[keegancsmith]

yup using the formatter is likely the way to do this.

[chrismwendt]

I've been using this locally behind a debug flag while working on Rockskip. I'm not 100% sure the escape function is safe (so I removed the code that ran the query automatically).

I didn't expect this to get merged without a lot more work, and it should've been a draft to begin with.