PostgreSQL conditional expressions - postgresql

Question

Is there a way to write two insert statements if a javascript object's value is not an empty string, or one insert statement if it is an empty string in a postgreSQL query using node-postgres?
My database table "job" setup:
CREATE TABLE "job" (
"id" SERIAL PRIMARY KEY,
"company" VARCHAR (20) NOT NULL
);
For example, I would like this object to insert two rows:
{
company: 'Apple',
company_two: 'Google'
}
And I would like this object to insert one row:
{
company: 'Facebook',
company_two: ''
}
If the javascript object has a value for "company_two", I would like to add a second row to the database.
Here is what I have working to insert one row, but this doesn't take the other property into account:
pool.query('INSERT INTO "job" ("company") VALUES $1', [testObject.company]);

Answer 1

Check if the object has a value in the company_two property and act accordingly, for example:
const query = 'INSERT INTO "job" ("company") VALUES ($1)';
if (testObject.company_two != '') {
pool.query(`${query}, ($2)`, [ testObject.company, textObject.company_two ]);
} else {
pool.query(query, [ testObject.company ]);
}
This will insert a single row if company_two is an empty string and two rows if it is not and empty string. Of course you should adjust the if condition to match what you expect.

Answer 2

You can "unnest" the JSON to rows, and then use that as the source for an insert:
insert into job (company)
select t.comp
from jsonb_each_text('{
"company": "Apple",
"company_two": "Google"
}'::jsonb) t(k,comp)
where t.comp <> '';
will insert both companies.
And this will only insert one row:
insert into job (company)
select t.comp
from jsonb_each_text('{
"company": "Facebook",
"company_two": ""
}'::jsonb) t(k,comp)
where t.comp <> '';