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Posted by Beowulf on 09/01/06 15:19
I was just messing around with some ad hoc views and table returning
UDFs today so I could look at and print out data from a small table
and noticed something strange.
If I stick my select statement into a View the columns are returned in
the order I specify in the SELECT, but if the same statement is in a UDF
(so I can specify a parameter), the columns are not returned in the
order specified in statement.
I know that relations don't have a specified column order, but it was my
understanding that a SELECT statement could be used to define how you
want your data presented. Views seem to respect the order specified in
the SELECT, but functions don't.
What am I missing? Is there some way to force the order of the columns
returned from a SELECT?
View:
CREATE VIEW dbo.View1
AS
SELECT Ident, Text, Type, ParentStmt, ForStmt, IfStmt, ChildStmt,
ThenStmt, ElseStmt, NextStmt
FROM dbo.tblStmt
WHERE (Ident LIKE '4.2.%')
Column order from this view:
Ident, Text, Type, ParentStmt, ForStmt, IfStmt, ChildStmt, ThenStmt,
ElseStmt, NextStmt
Function:
ALTER FUNCTION dbo.Function1
(@SearchPrm varchar(255))
RETURNS TABLE
AS
RETURN ( SELECT Ident, Text, Type, ParentStmt, ForStmt, IfStmt,
ChildStmt, ThenStmt, ElseStmt, NextStmt
FROM dbo.tblStmt
WHERE (Ident LIKE @SearchPrm) )
Column order from this function:
Type, Text, ElseStmt, NextStmt, IfStmt, ChildStmt, ThenStmt, Ident,
ParentStmt, ForStmt
Table:
(I know that this table isn't entirely normalized, but it serves my
purposes to have a matrix instead of a fully normalized relation):
CREATE TABLE dbo.tblStmt (
StmtID INT IDENTITY(1,1) CONSTRAINT PK_Stmt PRIMARY KEY,
Ident VARCHAR(255),
Text TEXT,
ErrorText TEXT,
Type INT,
ParentStmt VARCHAR(255),
ChildStmt VARCHAR(255),
IfStmt VARCHAR(255),
ForStmt VARCHAR(255),
ThenStmt VARCHAR(255),
ElseStmt VARCHAR(255),
NextStmt VARCHAR(255),
FullName VARCHAR(255),
LocalName VARCHAR(255),
Method INT
)
INSERT INTO tblStmt Ident, Text, Type, ParentStmt, NextStmt
VALUES('4.2.1', 'LineNumberOfResp := EMPTY' 64, '4.2', '4.2.2')
INSERT INTO tblStmt Ident, Text, Type, ParentStmt, ChildStmt, ForStmt,
NextStmt
VALUES('4.2.2', 'FOR K:= 1 TO 2', 128, '4.2', '4.2.3','4.2.7')
INSERT INTO tblStmt Ident, Text, Type ParentStmt, ChildStmt, ForStmt,
NextStmt
VALUES('4.2.3', 'Person[K].KEEP', 16, '4.2', '4.2.3.1', '4.2.2', '4.2.4')
INSERT INTO tblStmt Ident, Text, Type, ParentStmt, NextStmt
VALUES('4.2.3.1' 'AuxInterviewerName := DOSENV', 64, '4.2.3', '4.2.3.2')
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