load formatted json to postgreSQL table - json

Question

I want to load a formatted JSON file, in the form of
{
"EId":"104111",
"Category":"(0)",
"Mac":"ABV",
"Path":"chemin2",
"ID":"System.Byte"
}
by creating first a temporary table with a json column,
create temporary table temp_json (values json);
copy temp_json from '/path_to_the_file/test.json';
select values->>'EId' as EId,
values->>'Category' as Category,
values->>'Mac' as Mac,
values->>'Path' as Path,
values->>'ID' as ID
from(
select json_array_elements(values) as values
from temp_json
) a;
but it shows the following message:
ERROR: invalid input syntax for type JSON
DETAIL: The input string ended unexpectedly.
CONTEXT: JSON data, line 1: {
COPY temp_json, line 1, column values: "{"
once I erase all the whitespace, the instruction pass with no error.

Answer 1

Assuming a file like this:
{
"EId":"104111",
"Category":"(0)",
"Mac":"ABV",
"Path":"chemin2",
"ID":"System.Byte"
}
{
"EId":"104112",
"Category":"(1)",
"Mac":"CBV",
"Path":"chemin3",
"ID":"System.Byte"
}
The temporary table will receive text not json:
create temporary table temp_json (values text);
\copy temp_json from '/path_to/input.json';
The definitive table will have a json column:
create table t (obj jsonb);
Some string manipulation:
insert into t (obj)
select
regexp_split_to_table(
replace(v, $$"}{"$$, $$"}djue748wBc,l;09{"$$),
'djue748wBc,l;09'
)::jsonb
from (
select string_agg(values, '') as v
from temp_json
) s;
obj
--------------------------------------------------------------------------------------------
{"ID": "System.Byte", "EId": "104111", "Mac": "ABV", "Path": "chemin2", "Category": "(0)"}
{"ID": "System.Byte", "EId": "104112", "Mac": "CBV", "Path": "chemin3", "Category": "(1)"}

Answer 2

I don't think you're properly quoting this. See the docs on quoting, and on copy.
It's certainly possible,
CREATE TEMPORARY TABLE foo
AS
SELECT $${
"EId":"104111",
"Category":"(0)",
"Mac":"ABV",
"Path":"chemin2",
"ID":"System.Byte"
}$$::jsonb AS jsondata;