Is it possible to have default values in arguments of Stored procedures of Snowflake. For the below example, I am getting error. Please help
syntax error line 1 at position 53 unexpected ''test''.
create or replace procedure test(arg1 string default 'test')
returns string not null
language sql
as
$$
begin
return arg1;
end;
$$
;
Snowflake's procedures applies polymorphism instead of using default value. This solution is when you do not want to call sp like func1(Null)
For example (sql scripting):
create or replace procedure func1(arg1 varchar, arg2 varchar)
...
create or replace procedure func1(arg1 varchar)
...
call func1(arg1 , 'some-default-value')
...
One option could be providing NULL as value and handle it at the begining of the stored procedure with COALSESCE:
create or replace procedure test(arg1 string)
returns string not null
language sql
as
$$
begin
arg1 := COALESCE(arg1, 'test');
return arg1;
end;
$$;
CALL test(NULL);
-- test
Setting a default value/values as arguments directly in Stored procedures is not available in Snowflake currently
The below link can be referred for the allowed syntax in Stored Procedures
https://docs.snowflake.com/en/sql-reference/sql/create-procedure.html#syntax
Related
Overview HSQL IN parameter of type TIMESTAMP doesn't work as expected for HSQL stored procedure.
Given the following DDL :
CREATE TABLE TS_STORE (
ID_COL VARCHAR(20) NOT NULL PRIMARY KEY,
TS TIMESTAMP
);
A DML statement such as :
INSERT INTO TS_STORE (ID_COL, TS) VALUES ('key1', '2020-02-19 12:17:53');
will successfully insert a row.
Then when I attempt to create a stored procedure to do the same as:
CREATE PROCEDURE TEST_PROC(IN IN_KEY VARCHAR(20), IN IN_TS TIMESTAMP)
MODIFIES SQL DATA
BEGIN ATOMIC
INSERT INTO TS_STORE(ID_COL, TS)
VALUES (IN_KEY, IN_TS);
END;
and attempt to call it as:
CALL TEST_PROC('key2', '2020-02-19 12:17:53');
Then I get an error: "incompatible data type in conversion".
This is a problem for me, since I am not allowed to change the signature of the the stored procedure to bypass the problem, since in my case HSQL is used as a mock for a production database (DB2) where the equivalent procedure works as expected.
It works if you call the procedure with a TIMESTAMP value, as opposed to the character string.
CALL TEST_PROC('key2', TIMESTAMP'2020-02-19 12:17:53');
Is there a possibility to pass NULL value to some parameter of this FireDAC query?:
conn: TFDConnection;
fPar1, fPar2, fPar3: OleVariant;
cnt := conn.ExecSQLScalar(
'SELECT COUNT(*) FROM my_table WHERE par1=:p1 AND par2=:p2 AND par3=:p3',
[fPar1, fPar2, fPar3]
);
Is it possible without intermediate TFDQuery using TFDConnection object only?
Yes, you can do this, despite the fact that the parameters TFDConnection uses
for ExecSQLScalar are not directly accessible from your calling code, but it may not produce the result you are expecting unless you modify your SQL - see below.
Presumably, you have had an error message like "[FireDAC] parameter type [fPar2 ] is unknown ..." if you set fPar2 to Null beforehand.
You can avoid that by using the override of ExecSQLScalar that allows you to specify
the field types of the parameters in an open array following the parameter
which lists the variants, as in e.g.
cnt := conn.ExecSQLScalar(
'SELECT COUNT(*) FROM my_table WHERE par1=:p1 AND par2=:p2 AND par3=:p3',
[fPar1, fPar2, fPar3],
[ftString, ftString, ftString] // or whatever
);
See
function TFDCustomConnection.ExecSQLScalar(const ASQL: String;
const AParams: array of Variant; const ATypes: array of TFieldType): Variant;
in FireDAC.Comp.Client.Pas
BUT, on my data here, this does NOT produce the correct count value (using Seattle and SS2014) presumably because of Uwe Raabe's good point about par1 = Null versus par1 is Null. To get the correct answer, I had to modify the SQL as per Keith Miller's comment to include set ansi_nulls off before SELECT ...
I am working on a Netezza SP and is stuck with a problem.
I have a SP, defined as say:
CREATE OR REPLACE PROCEDURE MY_PROC(VARCHAR(ANY)) RETURNS INTEGER LANGUAGE NZPLSQL
AS
BEGIN_PROC
DECLARE
v_temp ALIAS FOR $1;
/* Other decalarations */
result_ts INTEGER;
BEGIN
result_ts := 0;
/* Procedure Body */
RETURN result_ts;
EXCEPTION WHEN OTHERS THEN
RAISE NOTICE 'Exception Raised: %', SQLERRM;
END;
END_PROC;
If I am running this SP with one value, such as:
SELECT MY_PROC('TEST_INPUT');
But if I am trying to run it with a column value, such as:
SELECT MY_PROC(TEST_COLUMN) FROM TEST_TABLE;
Its giving me error as:
ERROR: Can't use a stored procedure in this context
I know that in the second scenario I am passing an Array (i guess) but this is not what the Procedure has expected.
Now I am trying to have a procedure that can accept these kind of values but could not succeeded so far, LOOPing and all I have taken care but only problem is the Argument which I don't know how to pass.
Any help would be appreciated, let me know if I need to provide any extra info on this.
Asif
Stored procedures in Netezza, as of v7.2, can only be called in the following ways, as documented here.
CALL sproc_name(...);
EXEC sproc_name(...);
SELECT sproc_name(...);
Note that the SELECT form does not allow a FROM clause.
If you want the stored procedure to act on a particular column from a particular table that changes from invocation to invocation, you could pass the names of those as arguments to the stored procedure and have the entirety of the SQL logic encoded within. You could even pass arbitrary code into the stored procedure to build a query internally.
The way you are trying to call it now is more like calling a user defined function, and that simply won't work with stored procedures here.
Problem that I was facing is that I have to call one stored procedure from another stored procedure in DB2 database. Kind example that I am giving right below.
I have one stored procedure:
CREATE OR REPLACE PROCEDURE Proc1()
IS
Declare myName in varchar;
BEGIN
Select fname into myName from student where fname='x'; // is returning unique value
-- here call anoher proc2
END;
Now so this proc1 procedure is going to call this proc2 procedure.
Now I have second stored procedure:
CREATE OR REPLACE PROCEDURE Proc2(Name in varchar)
IS
BEGIN
-- do anything
END;
I solved this problem,
So solution is like If we want to execute proc using sql command then syntex is like below,
call Proc2('My Name');
We can use this same approach inside our proc also.
For that we have to follow some steps. Lets say that our above sql call is statement that we want to execute. we are going to convert that statement into String and pass necessary parameter by concating variable values. Then execute statement.
CREATE OR REPLACE PROCEDURE Proc1()
IS
Declare myName in varchar;
-- stmt variable is to execute our proc
STMT VARCHAR(4000);
BEGIN
Select fname into myName from student where fname='x'; // is returning unique value
-- this is our logic
STMT :='call Proc2('||myName||')';
EXECUTE IMMEDIATE STMT;
END;
I have declared a stored procedure in Sybase, and one of the parameters is of type datetime. Now I want to assign this datetime a default value.
Here's the declaration:
create procedure Procedure
(
#fromDate datetime = getdate()
)
...
However Sybase is giving me an error
Number (102) Severity (15) State (1) Server (SERVER) Procedure (Procedure) Incorrect syntax near '('.
Is it possible to do this? If not, is there a workaround?
You can not use a function call in a default variable assignment (as you found out).
Set the default to Null, and put an assignment first thing in the stored procedure.
create procedure Procedure
(
#fromDate datetime = NULL
)
begin
set #fromDate = coalesce( #fromDate , getdate() )
end