I am using SQL functions to perform multi-inserts, but because they can't accept recordsets as arguments I have to convert them to an array first. It works fine for array of primitives because they can simply be cast with CAST (${value} as primitive_type[]) and be done with it.
However multi-insert queries require composite type arrays and it doesn't look like CAST() works with them, since it expects one-column input.
All queries are shown on this fiddle: https://dbfiddle.uk/w_Qbq-lw
Tables and Types
CREATE TABLE accounts (
id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
login text NOT NULL,
password text NOT NULL,
email text
);
CREATE TYPE account_init AS (
login text,
password text,
email text
);
Functions
CREATE FUNCTION get_accounts(
pagination_limit bigint DEFAULT 25,
pagination_offset bigint DEFAULT 0,
account_ids bigint[] DEFAULT NULL
)
RETURNS TABLE (
id bigint,
created_at timestamptz,
login text,
password text,
email text
)
LANGUAGE SQL
AS $BODY$
WITH input_accounts AS (
SELECT
id,
created_at,
login,
password,
email
FROM
accounts
WHERE
account_ids IS NULL OR id = ANY (account_ids)
ORDER BY
id
LIMIT pagination_limit
OFFSET pagination_offset
)
SELECT
id,
created_at,
login,
password,
email
FROM
input_accounts
ORDER BY
id
$BODY$;
CREATE FUNCTION create_accounts(
account_inits account_init[]
)
RETURNS TABLE (
id bigint,
created_at timestamptz,
login text,
password text,
email text
)
LANGUAGE SQL
AS $BODY$
WITH new_accounts AS (
INSERT INTO accounts (
login,
password,
email
)
SELECT
login,
password,
email
FROM
unnest(account_inits)
RETURNING
id
)
SELECT
id,
created_at,
login,
password,
email
FROM
get_accounts(
NULL,
NULL,
ARRAY(
SELECT
id
FROM
new_accounts
)
)
ORDER BY
id
$BODY$;
Init data
const account_inits = [
{
login:"EC4A42323F",
password: "3DF1542F23A29B73281EEC5EBB55FFE18C253A7E800E7A541B"
},
{
login:"1D771C1E52",
password: "2817029563CC722FBC3D53F9F29F0000898F9843518D882E4A",
email: "a@b"
},
{
login:"FB66381D3A",
password: "C8F865AC1D54CFFA56DEBDEEB671C8EF110991BBB3B9EE57D2",
email: null
}
]
Usage
--- insert data
WITH input_inits AS (
SELECT
login,
password,
email
FROM
json_to_recordset(${account_inits:json}) AS input_init(
login text,
password text,
email text
)
),
input_data AS (
SELECT
array_agg(
CAST (
(
login,
password,
email
) AS account_init
)
) AS account_inits
FROM
input_inits
)
SELECT
new_accounts.id,
new_accounts.created_at,
new_accounts.login,
new_accounts.password,
new_accounts.email
FROM
input_data
CROSS JOIN
create_accounts(input_data.account_inits) AS new_accounts
ORDER BY
new_accounts.id ASC
;
Currently I interpolate it as :json and then convert it to recordset in the CTE, which then gets converted to a composite type array in the second CTE to pass as an argument to the function. This seems to be awfully a lot of work for passing the array of objects to the function arguments. I've tried to work without :json conversion but either encountered array[] related or malformed object literal syntax errors.
