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A blog about .NET programming, Javascript, HTML, and SQL. The blog also covers general programming topics, design, specifications, and industry trends.
Wednesday, September 17, 2008
Arrays and SQL
An article that describes different techniques for faking arrays in SQL.
Faking Arrays in Transact SQL/
Here's a technique I wrote. It takes a delimited string and returns a results set. You can turn this into a function which returns a table variable too.
===========================================
create procedure usp_parse_string(@delimiter varchar(5), @parsestring varchar(1000))
as
SET NOCOUNT ON
declare @tempstring1 varchar(1000)
declare @tempstring2 varchar(1000)
declare @pos int, @oldpos int
create table #mytable (token_string varchar(100))
/* trim spaces of the string */
select @tempstring1 = ltrim(rtrim(@parsestring))
select @tempstring1 = REPLACE (@tempstring1, '"' , '' )
--select @tempstring1
/* see if delimiter is in string */
select @pos = charindex(@delimiter, @tempstring1)
/* select @tempstring2 */
/* if it is in the string, then get first token */
if @pos <> 0
begin
select @tempstring2 = substring(@tempstring1,1,@pos - 1)
--select @tempstring2
--insert it into the token table
insert into #mytable values (@tempstring2)
end
/* now get rest of tokens */
select @oldpos = @pos
select @pos = charindex(@delimiter, @tempstring1, @pos + 1)
while @pos <> 0
begin
select @tempstring2 = substring(@tempstring1, @oldpos + 1, @pos - @oldpos - 1)
insert into #mytable values (@tempstring2)
--select @tempstring2
select @oldpos = @pos
select @pos = charindex(@delimiter, @tempstring1, @pos + 1)
end
--get the last token
select @tempstring2 = substring(@tempstring1, @oldpos + 1, len(@tempstring1))
--select @tempstring2
insert into #mytable values (@tempstring2)
select * from #mytable
go
===========================================
Faking Arrays in Transact SQL/
Here's a technique I wrote. It takes a delimited string and returns a results set. You can turn this into a function which returns a table variable too.
===========================================
create procedure usp_parse_string(@delimiter varchar(5), @parsestring varchar(1000))
as
SET NOCOUNT ON
declare @tempstring1 varchar(1000)
declare @tempstring2 varchar(1000)
declare @pos int, @oldpos int
create table #mytable (token_string varchar(100))
/* trim spaces of the string */
select @tempstring1 = ltrim(rtrim(@parsestring))
select @tempstring1 = REPLACE (@tempstring1, '"' , '' )
--select @tempstring1
/* see if delimiter is in string */
select @pos = charindex(@delimiter, @tempstring1)
/* select @tempstring2 */
/* if it is in the string, then get first token */
if @pos <> 0
begin
select @tempstring2 = substring(@tempstring1,1,@pos - 1)
--select @tempstring2
--insert it into the token table
insert into #mytable values (@tempstring2)
end
/* now get rest of tokens */
select @oldpos = @pos
select @pos = charindex(@delimiter, @tempstring1, @pos + 1)
while @pos <> 0
begin
select @tempstring2 = substring(@tempstring1, @oldpos + 1, @pos - @oldpos - 1)
insert into #mytable values (@tempstring2)
--select @tempstring2
select @oldpos = @pos
select @pos = charindex(@delimiter, @tempstring1, @pos + 1)
end
--get the last token
select @tempstring2 = substring(@tempstring1, @oldpos + 1, len(@tempstring1))
--select @tempstring2
insert into #mytable values (@tempstring2)
select * from #mytable
go
===========================================
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