Re: Escape Python to `json[]` for `COPY FROM` PostgreSQL insertion?

On 2/20/23 20:34, Samuel Marks wrote:
> How do I insert into a table with a `json[]` column using the `COPY 
> FROM` syntax?

Again why do you want to use json[]?

What possible use is that, when you have json and jsonb types available?

> 
> Attempt: 
> https://gist.github.com/SamuelMarks/fec744a620e2abd0257671aa6f2a96b4 
> 
> 
> Error:
> psycopg2.errors.InvalidTextRepresentation: malformed array literal: 
> "{"jj":null,"text":"bop"}"
> 
> Or when I try to json.dump the dict twice I get:
> psycopg2.errors.InvalidTextRepresentation: malformed array literal: 
> ""{"jj":null,"text":"bop"}"" DETAIL:  Array value must start with "{" or 
> dimension information. CONTEXT:  COPY my_table, line 1, column 
> json_arr_col: ""{"jj":null,"text":"bop"}""
> 
> I'm using your `copy_expert` function. PS: Also asked on 
> https://stackoverflow.com/q/75511919 
> 
> Am I meant to represent the lists with braces rather than square 
> brackets? - Or should I be using some internal psycopg function as 
> opposed to my hacked together `parse_col` function?
> 
> Thanks,
> 
> Samuel Marks
> Charity  | consultancy 
>  | open-source  | 
> LinkedIn 

-- 
Adrian Klaver
adrian.klaver@aklaver.com