[英]Why doesn't the array store the composite type in a proper way in JavaScript?
[英]What is the proper way of converting interpolated array of objects to a postgresql array of composite type?
我正在使用 SQL 函數執行多重插入,但因為它們不能接受記錄集作為 arguments 我必須先將它們轉換為數組。 它適用於基元數組,因為它們可以簡單地使用CAST (${value} as primitive_type[])
進行轉換並完成。
然而,多插入查詢需要復合類型 arrays 並且它看起來不像CAST()
與它們一起工作,因為它需要單列輸入。
所有查詢都顯示在這個小提琴上: https://dbfiddle.uk/w_Qbq-lw
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
);
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
$BODY$;
const account_inits = [
{
login:"EC4A42323F",
password: "3DF1542F23A29B73281EEC5EBB55FFE18C253A7E800E7A541B"
},
{
login:"1D771C1E52",
password: "2817029563CC722FBC3D53F9F29F0000898F9843518D882E4A",
email: "a@b"
},
{
login:"FB66381D3A",
password: "C8F865AC1D54CFFA56DEBDEEB671C8EF110991BBB3B9EE57D2",
email: null
}
]
--- 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
;
目前我將它插入為:json
,然后將其轉換為 CTE 中的記錄集,然后在第二個 CTE 中將其轉換為復合類型數組,作為參數傳遞給 function。這似乎需要大量工作才能傳遞對象數組到 function arguments。我嘗試在沒有:json
轉換的情況下工作,但遇到array[]
相關或malformed object literal
語法錯誤。
原來沒有。 “正確的”替代方案需要知道輸入數組中對象的預期鍵(以及所有嵌套對象/對象數組),以便構造正確的元組數組。
這基本上需要某種運行時引用模式,即使完美實現,仍然需要為每個新查詢文件編寫樣板代碼。 充其量它不會比helpers
模塊中的函數或查詢中的json -> record set -> composite type array
轉換更好。
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