How to insert json data into postgres database table - json

Question

I m a beginner and trying to insert JSON values into the database using a tutorial
I have created the table using the following command
CREATE TABLE table_name( id character varying(50),
data json NOT NULL,
active boolean NOT NULL,
created_at timestamp with time zone NOT NULL,
updated_at timestamp with time zone NOT NULL,
CONSTRAINT table_name_pkey PRIMARY KEY (id)
);
The table is created with table_name.
Now I am trying to insert the values into the database:
INSERT INTO table_name
SELECT id,data,active,created_at,updated_at
FROM json_populate_record (NULL::table_name,
'{
"id": "1",
"data":{
"key":"value"
},
"active":true,
"created_at": SELECT NOW(),
"updated_at": SELECT NOW()
}'
);
It throws the following error
ERROR: Invalid input syntax for type JSON '{
Could anyone help me to resolve and insert the JSON values into the DB?

Answer 1

You can't include arbitrary SQL commands inside a JSON string. From a JSON "perspective" SELECT NOW() is an invalid value because it lacks the double quotes. But even if you used "select now()" that would be executed as a SQL query and replaced with the current timestamp) .
But I don't understand why you are wrapping this into a jsonb_populate_record. The better solution (at least in my opinion) would be:
INSERT INTO table_name (id, data, active, created_at, updated_dat)
VALUES ('1', '{"key": "value"}', true, now(), now();
If you really want to complicate things, you need to use string concatenation:
SELECT id,data,active,created_at,updated_at
FROM json_populate_record (NULL::table_name,
format('{
"id": "1",
"data":{
"key":"value"
},
"active":true,
"created_at": "%s",
"updated_at": "%s"
}', now(), now())::json
);