MSSQL - Create table function, return substring - sql

Question

I need to create this table function. The function needs to return single words from passed parameters like: hello, hhuu, value
The table function should return:
hello,
hhuu,
value
But I am always getting some errors, please could you help me?

Answer 1

you can write as:
DECLARE #input_char VARCHAR(255)
SET #input_char = 'hello, hhuu, value'
;WITH cte AS (
SELECT
CAST('<r>' + REPLACE(#input_char, ' ', '</r><r>') + '</r>' AS XML) AS input_char
)
SELECT
rtrim( LTRIM (xTable.xColumn.value('.', 'VARCHAR(MAX)')) ) AS input_char
FROM cte
CROSS APPLY input_char.nodes('//r') AS xTable(xColumn)

Answer 2

Please give a look at this article:
http://www.codeproject.com/Tips/625872/Convert-a-CSV-delimited-string-to-table-column-in
and you could use ' ' (space) as delimiter.
SELECT * FROM dbo.CSVtoTable('hello, hhuu, value', ' ')

Answer 3

I have used the following function many times. It is a bit lengthy forgive me, but it has become a great tool for me.
CREATE Function [dbo].[ParseText2Table]
(
#p_SourceText varchar(MAX)
,#p_Delimeter varchar(100) = ',' --default to comma delimited.
)
RETURNS #retTable TABLE
(
POSITION INT
,Int_Value bigint
,Num_value REAL--Numeric(18,3)
,txt_value varchar(MAX)
)
AS
BEGIN
DECLARE #tmpTable TABLE
(
Position2 INT IDENTITY(1,1) PRIMARY KEY
,Int_Value bigint
,Num_value REAL--Numeric(18,3)
,txt_value varchar(MAX)
)
DECLARE #w_Continue INT
,#w_StartPos INT
,#w_Length INT
,#w_Delimeter_pos INT
,#w_tmp_int bigint
,#w_tmp_num REAL--numeric(18,3)
,#w_tmp_txt varchar(MAX)
,#w_Delimeter_Len INT
IF len(#p_SourceText) = 0
BEGIN
SET #w_Continue = 0 -- force early exit
END
ELSE
BEGIN
-- if delimiter is ' ' change
IF #p_Delimeter = ' '
BEGIN
SET #p_SourceText = replace(#p_SourceText,' ','ÿ')
SET #p_Delimeter = 'ÿ'
END
-- parse the original #p_SourceText array into a temp table
SET #w_Continue = 1
SET #w_StartPos = 1
SET #p_SourceText = RTRIM( LTRIM( #p_SourceText))
SET #w_Length = DATALENGTH( RTRIM( LTRIM( #p_SourceText)))
SET #w_Delimeter_Len = len(#p_Delimeter)
END
WHILE #w_Continue = 1
BEGIN
SET #w_Delimeter_pos = CHARINDEX( #p_Delimeter
,(SUBSTRING( #p_SourceText, #w_StartPos
,((#w_Length - #w_StartPos) + #w_Delimeter_Len)))
)
IF #w_Delimeter_pos > 0 -- delimeter(s) found, get the value
BEGIN
SET #w_tmp_txt = LTRIM(RTRIM( SUBSTRING( #p_SourceText, #w_StartPos
,(#w_Delimeter_pos - 1)) ))
IF dbo.isReallyNumeric(#w_tmp_txt) = 1 --and not #w_tmp_txt in('.', '-', '+', '^')
BEGIN
--set #w_tmp_int = cast( cast(#w_tmp_txt as real) as bigint)--numeric) as bigint)
SET #w_tmp_int = CASE WHEN (CAST(#w_tmp_txt AS REAL) BETWEEN -9223372036854775808 AND 9223372036854775808) THEN CAST( CAST(#w_tmp_txt AS REAL) AS bigint) ELSE NULL END
SET #w_tmp_num = CAST( #w_tmp_txt AS REAL)--numeric(18,3))
END
ELSE
BEGIN
SET #w_tmp_int = NULL
SET #w_tmp_num = NULL
END
SET #w_StartPos = #w_Delimeter_pos + #w_StartPos + (#w_Delimeter_Len- 1)
END
ELSE -- No more delimeters, get last value
BEGIN
SET #w_tmp_txt = LTRIM(RTRIM( SUBSTRING( #p_SourceText, #w_StartPos
,((#w_Length - #w_StartPos) + #w_Delimeter_Len)) ))
IF dbo.isReallyNumeric(#w_tmp_txt) = 1 --and not #w_tmp_txt in('.', '-', '+', '^')
BEGIN
--set #w_tmp_int = cast( cast(#w_tmp_txt as real) as bigint)--as numeric) as bigint)
SET #w_tmp_int = CASE WHEN (CAST(#w_tmp_txt AS REAL) BETWEEN -9223372036854775808 AND 9223372036854775808) THEN CAST( CAST(#w_tmp_txt AS REAL) AS bigint) ELSE NULL end
SET #w_tmp_num = CAST( #w_tmp_txt AS REAL)--numeric(18,3))
END
ELSE
BEGIN
SET #w_tmp_int = NULL
SET #w_tmp_num = NULL
END
SELECT #w_Continue = 0
END
INSERT INTO #tmpTable VALUES( #w_tmp_int, #w_tmp_num, #w_tmp_txt )
END
INSERT INTO #retTable SELECT Position2, Int_Value ,Num_value ,txt_value FROM #tmpTable
RETURN
END
Here are the supporting functions for above as well:
CREATE FUNCTION dbo.isReallyInteger
(
#num VARCHAR(64)
)
RETURNS BIT
BEGIN
IF LEFT(#num, 1) = '-'
SET #num = SUBSTRING(#num, 2, LEN(#num))
RETURN CASE
WHEN PATINDEX('%[^0-9-]%', #num) = 0
AND CHARINDEX('-', #num) <= 1
AND #num NOT IN ('.', '-', '+', '^')
AND LEN(#num)>0
AND #num NOT LIKE '%-%'
THEN
1
ELSE
0
END
END
CREATE FUNCTION dbo.isReallyNumeric
(
#num VARCHAR(64)
)
RETURNS BIT
BEGIN
IF LEFT(#num, 1) = '-'
SET #num = SUBSTRING(#num, 2, LEN(#num))
DECLARE #pos TINYINT
SET #pos = 1 + LEN(#num) - CHARINDEX('.', REVERSE(#num))
RETURN CASE
WHEN PATINDEX('%[^0-9.-]%', #num) = 0
AND #num NOT IN ('.', '-', '+', '^')
AND LEN(#num)>0
AND #num NOT LIKE '%-%'
AND
(
((#pos = LEN(#num)+1)
OR #pos = CHARINDEX('.', #num))
)
THEN
1
ELSE
0
END
END
Usage Examples:
--Single Character Delimiter
--select * from dbo.ParseText2Table('100|120|130.56|Yes|Cobalt|Blue','|')
--select txt_value from dbo.ParseText2Table('100 120 130.56 Yes Cobalt Blue',' ') where Position = 3
--select * from dbo.ParseText2Table('100,120,130.56,Yes,Cobalt,Blue,,',',')
/*
POSITION Int_Value Num_value txt_value
----------- ----------- -------------------- --------------
1 100 100.000 100
2 120 120.000 120
3 131 130.560 130.56
4 NULL NULL Yes
5 NULL NULL Cobalt Blue
*/