Execute function returning boolean with input parameters in PLSQL

How can I run a function returning a boolean in PLSQL using linq2db?

Steps to reproduce

return _db.DataConnection.SelectAsync(() => MyPkg.MyFunction(myParameter));

Expected result: return a true or false based on result of the function execution

this is failing with invalid datatype, not sure how to achieve this, ExecuteProc<T> doesn’t work to run functions.

Thanks

[MaceWindu]

Ok, there is nothing we can do here as this error is returned by Oracle.

I’ve managed to call function using this definition (taken from here) but it is not very exciting…:

Option 1: use Execute

db.Execute(@"WITH
FUNCTION convert_bool(i IN VARCHAR2) RETURN NUMBER AS
BEGIN
	RETURN CASE ISSUE3742(i) WHEN TRUE THEN 1 WHEN FALSE THEN 0 END;
END convert_bool;
SELECT convert_bool(:p) FROM SYS.DUAL", new { p = "test" });

Option 2: use Sql.Expression and query prefix

// ** marker instructs linq2db to add "hint" before query
db.NextQueryHints.Add(@"**WITH
FUNCTION convert_bool(i IN VARCHAR2) RETURN NUMBER AS
BEGIN
	RETURN CASE ISSUE3742(i) WHEN TRUE THEN 1 WHEN FALSE THEN 0 END;
END convert_bool;");

db.Select(() => Issue3742Function("test"));

[Sql.Expression("convert_bool({0})", ServerSideOnly = true)]
public static bool Issue3742Function(string parameter) => ThrowHelper.ThrowInvalidOperationException<bool>();

Option 3: you can always add wrapper function in Oracle to call plsql function and convert result to number

[MaceWindu]

Sometimes I wonder what’s wrong with Oracle? 🤦‍♂️

Why introduce boolean and then make it unavailable to SQL?