Postgresql 在函数中UPSERT语法，该函数对表中两列的组合具有唯一约束

我试图在一个表上的函数中使用UPSERT语法，该表在两列的组合上包含唯一约束，但我收到一个错误，它说“没有与冲突规范匹配的唯一或排除约束”

奇怪的是，同一个查询在函数外部工作得很好

那么，假设我有一个下表：

CREATE TABLE IF NOT EXISTS test (
  id SERIAL,
  col1 VARCHAR NOT NULL,
  col2 VARCHAR NOT NULL,
  UNIQUE(col1, col2)
);

现在我可以做这样的插入（效果很好）：

现在我想在函数中使用这个查询：

CREATE OR REPLACE FUNCTION test_func(col1 VARCHAR, col2 VARCHAR)
RETURNS INTEGER AS $$
  #variable_conflict use_variable
  DECLARE
    rowid INTEGER;
BEGIN
  INSERT INTO test(col1, col2) VALUES(col1, col2)
    ON CONFLICT (col1, col2) DO NOTHING
    RETURNING id INTO rowid;
  RETURN rowid;
END;
$$ LANGUAGE PLPGSQL;

但是当我调用函数时，我得到了一个错误：

SELECT test_func('val1', 'val2');

    ERROR:  there is no unique or exclusion constraint matching the ON CONFLICT specification
CONTEXT:  SQL statement "INSERT INTO test(col1, col2) VALUES(col1, col2)
    ON CONFLICT (col1, col2) DO NOTHING
    RETURNING id"
PL/pgSQL function test_func(character varying,character varying) line 6 at SQL statement
********** Error **********

ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification
SQL state: 42P10
Context: SQL statement "INSERT INTO test(col1, col2) VALUES(col1, col2)
    ON CONFLICT (col1, col2) DO NOTHING
    RETURNING id"
PL/pgSQL function test_func(character varying,character varying) line 6 at SQL statement

---

有什么问题吗？

将您的参数重命名为例如

p\u col1、p\u col2

@a\u horse\u with\u no\u name谢谢，您是对的！我发现错误消息有误导性。请将您的参数重命名为例如

p\u col1，p\u col2

@a\u horse\u with\u no\u name谢谢，您是对的！我发现错误消息有误导性。

SELECT test_func('val1', 'val2');

    ERROR:  there is no unique or exclusion constraint matching the ON CONFLICT specification
CONTEXT:  SQL statement "INSERT INTO test(col1, col2) VALUES(col1, col2)
    ON CONFLICT (col1, col2) DO NOTHING
    RETURNING id"
PL/pgSQL function test_func(character varying,character varying) line 6 at SQL statement
********** Error **********

ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification
SQL state: 42P10
Context: SQL statement "INSERT INTO test(col1, col2) VALUES(col1, col2)
    ON CONFLICT (col1, col2) DO NOTHING
    RETURNING id"
PL/pgSQL function test_func(character varying,character varying) line 6 at SQL statement