After running a PostgreSQL function that has a RETURNS void statement, I noticed that db.none() throws an error message saying "No return data was expected.".
As a workaround, I decided to use the db.one() method instead, which successfully returns an object with the value { PS_name: '' }.
Is it common for PostgreSQL void functions to actually provide an empty object as a return value? How should void functions be properly handled when using pg-promise?
The answer below is outdated now, as PostgreSQL v11 has introduced support for proper stored procedures. The method proc can now only call a stored procedure using the new CALL syntax.
How should void functions be handled with pg-promise in the most appropriate manner?
Utilize the proc Database method.
db.proc('proc_name', [param1, param2,...])
.then(data => {
/* data could be null or an object */
})
.catch(error => {
/* error handling */
});
UPDATE
When using
proc, how can parameter types be specified to resolve errors like? For example, if I tryfunction foo(unknown) does not existdb.proc('foo($1::int2[])', x), it gives asyntax error at or near "(".
You cannot specify parameter types with the proc method, which is designed for simplicity. If your call requires SQL type casting, you should execute it as a regular query with casting inside the template:
db.oneOrNone('SELECT * FROM proc_name($1::int2[], $2, ...)', [param1, param2,...])
.then(data => {
/* data may be null or an object */
})
.catch(error => {
/* handle any errors */
});
In this context, the oneOrNone method provides similar result expectations as the proc method.
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