Meningkatkan penanganan pengecualian dengan stacked diagnostics
Transaksi dan Penanganan Error di PostgreSQL
Jason Myers
Principal Engineer
Menangkap lebih banyak informasi error
DO $$
BEGIN
UPDATE inventory SET cost = 35.0 WHERE name = 'Macaron';
UPDATE inventory SET cost = 3.50 WHERE name = 'Panellets';
EXCEPTION
WHEN others THEN
INSERT INTO errors (msg) VALUES ('Max cost is 10!');
RAISE INFO 'Max cost is 10!';
END;
$$ language 'plpgsql';
Menggunakan stacked diagnostics
DO $$ DECLARE exc_message text; exc_detail text;BEGIN UPDATE inventory SET cost = 35.0 WHERE name = 'Macaron'; UPDATE inventory SET cost = 3.50 WHERE name = 'Panellets';EXCEPTION WHEN others THEN GET STACKED DIAGNOSTICS exc_message = MESSAGE_TEXT, exc_detail = PG_EXCEPTION_DETAIL; INSERT INTO errors (msg, detail) VALUES (exc_message, exc_detail); RAISE INFO 'Exception Messaage: % | Exception Details: %', exc_message, exc_detail; END$$;
Contoh keluaran diagnostik
INFO: Exception Messaage: new row for relation "inventory" violates check constraint
"cost_check" | Exception Details: Failing row contains (7, 35, Macaron).
DO
postgres=# \x on
Expanded display is on.
postgres=# select msg, detail from errors;
-[ RECORD 1 ]-------------------------------------------------------------------
msg | new row for relation "inventory" violates check constraint "cost_check"
detail | Failing row contains (7, 35, Macaron).
Apa saja yang bisa diambil?
| Name | Description |
|---|---|
| RETURNED_SQLSTATE | kode error SQLSTATE dari pengecualian |
| COLUMN_NAME | nama kolom terkait pengecualian |
| CONSTRAINT_NAME | nama constraint terkait pengecualian |
| MESSAGE_TEXT | teks pesan utama pengecualian |
| PG_EXCEPTION_DETAIL | teks pesan detail pengecualian, jika ada |
1 https://www.postgresql.org/docs/12/plpgsql-control-structures.html
Lebih banyak titik data diagnostik
| Name | Description |
|---|---|
| PG_DATATYPE_NAME | nama tipe data terkait pengecualian |
| TABLE_NAME | nama tabel terkait pengecualian |
| SCHEMA_NAME | nama skema terkait pengecualian |
| PG_EXCEPTION_HINT | teks pesan petunjuk pengecualian, jika ada |
| PG_EXCEPTION_CONTEXT | baris teks call stack saat pengecualian terjadi |
Ayo berlatih!
Transaksi dan Penanganan Error di PostgreSQL
