When run as a "User defined function" it errors:
Error:443: Invalid use of Execute within a function.
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Question
Cursors and user defined function
Here is a UDF using a cursor:
==========================
Declare @var varchar(200)
Declare sql_cursor CURSOR FOR select @fieldname from @tablename where @keyname = @id
Open sql_cursor
Fetch next From sql_cursor into @var
while @@Fetch_Status=0
Begin
Set @string=@string + @var + ';'
Fetch next From sql_cursor into @var
End
Close sql_cursor
Deallocate sql_cursor
==========================
I want to be able to use variables when i declare the cursor via a select but am having difficulties. ie:
Declare sql_cursor CURSOR FOR select @fieldname from @tablename where @keyname = @id
I have also tried using the following to no avail.
Declare sql_cursor CURSOR FOR exec sp_executesql(select @fieldname from @tablename where @keyname = @id)
Thanks
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Answers
yeah, forgot that minor detail ! Since dynamic SQL cannot be used in UDFs (and assuming that this HAS to be a UDF), only other thought I have is to use all (or all *valid*, to keep it sane) permutations of @fieldname, @tablename and @keyname e.g.
DECLARE @var varchar(200)
DECLARE @string varchar(8000)
DECLARE @sql_string varchar(8000)
IF @tablename = 'sysobjects' and @fieldname = 'name' and @keyname = 'id'
BEGIN
DECLARE sql_cursor CURSOR FOR SELECT name FROM sysobjects WHERE id = @id
END
ELSE IF @tablename = 'syscolumns' and @fieldname = 'name' and @keyname = 'id'
BEGIN
DECLARE sql_cursor CURSOR FOR SELECT name FROM syscolumns WHERE id = @id
END
ELSE
...
...
OPEN sql_cursor
FETCH NEXT FROM sql_cursor INTO @var
WHILE @@FETCH_STATUS = 0
BEGIN
SET @string = ISNULL(@string,'') + @var + ';'
FETCH NEXT FROM sql_cursor INTO @var
END
CLOSE sql_cursor
DEALLOCATE sql_cursor
The following is an example of how to get rid of the cursor which is inefficient and just use the straight select statement. It creates a table puts two phone numbers in it and then returns the phone numbers is a comma delimeted list.
CREATE TABLE Contacts
(
ContactID int IDENTITY PRIMARY KEY,
FirstName varchar(100),
LastName varchar(100)
)
CREATE TABLE PhoneNumbers
(
PhoneID int IDENTITY PRIMARY KEY,
ContactID int,
PhoneNumber varchar(50)
)
DECLARE @id int
INSERT INTO Contacts
VALUES ('John', 'Smith')
SELECT @id = @@IDENTITY
INSERT INTO PhoneNumbers
VALUES (@id, '111-222-3333')
INSERT INTO PhoneNumbers
VALUES (@id, '444-555-6666')
GO
/*
Code to create UDF for getting phone numbers
*/
CREATE FUNCTION GetPhones (@ContactID int)
RETURNS varchar(2000)
AS
BEGIN
DECLARE @phones varchar(2000)
SET @phones = ''
SELECT @phones =
CASE @phones
WHEN '' THEN ISNULL(PhoneNumber, '')
ELSE @phones + ', ' + ISNULL(PhoneNumber, '')
END
FROM PhoneNumbers
WHERE ContactID = @ContactID
RETURN(@phones)
END
GO
/*
Code to execute function from SELECT statement
*/
SELECT FirstName, LastName, dbo.GetPhones(ContactID)
From Contacts
greenrc:
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by: jchopdePosted on 2002-09-14 at 08:32:15ID: 7280655
Use --
--Dynamic parameters
DECLARE @fieldname varchar(256)
DECLARE @tablename varchar(256)
DECLARE @keyname varchar(256)
--change to varchar and handle quotes in dynamic sql if that is the case
DECLARE @id int
SET @fieldname = 'name'
SET @tablename = 'sysobjects'
SET @keyname = 'id'
SET @id = 1
--
DECLARE @var varchar(200)
DECLARE @string varchar(8000)
DECLARE @sql_string varchar(8000)
SET @sql_string = 'DECLARE sql_cursor cursor FOR SELECT ' +
@fieldname + ' FROM ' + @tablename + ' WHERE ' +
@keyname + ' = ' + CAST(@id AS varchar)
EXEC(@sql_string)
OPEN sql_cursor
FETCH NEXT FROM sql_cursor INTO @var
WHILE @@FETCH_STATUS = 0
BEGIN
SET @string = ISNULL(@string,'') + @var + ';'
FETCH NEXT FROM sql_cursor INTO @var
END
--Debug print, remove after testing
PRINT '****' + @string + '****'
CLOSE sql_cursor
DEALLOCATE sql_cursor