![]() ![]() How to use RETURNING with ON CONFLICT in PostgreSQL?.There are many other ways to pass multiple rows. Select rows such that names match elements of input array for pgsql function.Note the default maximum of 100 function parameters! See: passes values as well-known row types with a VARIADIC function parameter. How do I (or can I) SELECT DISTINCT on multiple columns?. #Getorgchart ajax foreign key update#applies INSERT or UPDATE (true "UPSERT") on bar: If the description already exists, its type is updated - but only if it actually changes. applies SELECT or INSERT on foo: Any type that doesn't exist in the FK table, yet, is inserted. ![]() In addition to the queries above, this function. , '("with,comma",green)' - added to demonstrate row syntaxįast and rock-solid for environments with concurrent transactions. WHERE b.foo_id EXCLUDED.foo_id - only if actually changed SET foo_id = EXCLUDED.foo_id - real UPSERT this time ON CONFLICT (description) DO UPDATE - description already exists LEFT JOIN ins i USING (type) - newly inserted LEFT JOIN typ t USING (type) - already existed ![]() SELECT v.description, COALESCE(t.id, i.id) - assuming most types pre-exist INSERT INTO bar AS b (description, foo_id) SET type = EXCLUDED.type - overwrite to make visible ON CONFLICT (type) DO UPDATE - RARE cases of concurrent inserts LEFT JOIN foo f USING (type) - assuming no concurrent update/delete on foo SELECT v.type, f.id - id NOT NULL where type already existsįROM (SELECT DISTINCT type FROM val) v - DISTINCT! WITH val AS (SELECT * FROM unnest(_val)) - well-known row type We could do without it, but it's simpler: CREATE TYPE foobar AS (description text, type text) įunction: CREATE OR REPLACE FUNCTION f_insert_foobar(VARIADIC _val foobar) Then use this to replace the VALUES expression in above statement: SELECT split_part(x, ',', 1) AS descriptionįROM unnest(string_to_array(_param, ' ')) x įunction with UPSERT in Postgres 9.5 or laterĬreate a custom row type for parameter passing. For instance of the form: 'description1,type1 description2,type2 description3,type3' Or, if the syntax for such an array seems too messy, use a comma-separated string as parameter _param. Function for repeated useĬreate an SQL function that takes an array of composite type as parameter and use unnest(param) in place of the VALUES expression. ![]() In comparison to caching solutions like advertised in another answer, the chance is super-tiny. Really only happens under heavy concurrent load, if ever.
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