Split/explode comma delimited string with Sybase SQL Anywhere [duplicate]

Answer 1

You use text in your query and this is not going to work. Use dynamic query.

Answer 2

Like Mikael Eriksson said, there is answer at dba.stackexchange.com with two very good solutions, first with use of sa_split_list system procedure, and second slower with CAST statement.

For the Sybase SQL Anywhere 9 sa_split_list system procedure not exist, so I have made sa_split_list system procedure replacement (I used parts of the code from bsivel answer):

CREATE PROCEDURE str_split_list
(in str long varchar, in delim char(10) default ',')
RESULT(
  line_num integer,
  row_value long varchar)
BEGIN
  DECLARE str2 long varchar;
  DECLARE position integer;

   CREATE TABLE #str_split_list (
   line_num integer DEFAULT AUTOINCREMENT,
   row_value long varchar null,
   primary key(line_num));

   SET str = TRIM(str) || delim;
   SET position = CHARINDEX(delim, str);

   separaterows:
   WHILE position > 0 loop
       SET str2 = TRIM(LEFT(str, position - 1));
       INSERT INTO #str_split_list (row_value)
       VALUES (str2);
       SET str = RIGHT(str, LENGTH(str) - position);
       SET position = CHARINDEX(delim, str);
    end loop separaterows;

   select * from #str_split_list order by line_num asc;

END

Execute the same way as sa_split_list with default delimiter ,:

select * from str_split_list('1234,23,56,576,1231,567,122,87876,57553,1216')

or with specified delimiter which can be changed:

select * from str_split_list('1234,23,56,576,1231,567,122,87876,57553,1216', ',')

Answer 3

Good contribution from bsivel answer, but to generalise it (for other separators than a comma), then the line

SET @list = LTRIM(RTRIM(@list))+ ','

must become

SET @list = LTRIM(RTRIM(@list))+ @delimiter

The first version will only work for comma-separated lists.

Answer 4

This can be done without using dynamic SQL but you will need to create a couple of supporting objects. The fist object is a table valued function that will parse your string and return a table of integers. The second object is a stored procedure that will have a parameter where you can pass the string (id_list), parse it to a table, and then finally join it to your query.

First, create the function to parse the string:

CREATE FUNCTION [dbo].[String_To_Int_Table]
(
         @list NVARCHAR(1024)
       , @delimiter NCHAR(1) = ',' --Defaults to CSV
)
RETURNS
    @tableList TABLE(
       value INT
       )
AS

BEGIN
   DECLARE @value NVARCHAR(11)
   DECLARE @position INT

   SET @list = LTRIM(RTRIM(@list))+ ','
   SET @position = CHARINDEX(@delimiter, @list, 1)

   IF REPLACE(@list, @delimiter, '') <> ''
   BEGIN
          WHILE @position > 0
          BEGIN 
                 SET @value = LTRIM(RTRIM(LEFT(@list, @position - 1)));
                 INSERT INTO @tableList (value)
                 VALUES (cast(@value as int));
                 SET @list = RIGHT(@list, LEN(@list) - @position);
                 SET @position = CHARINDEX(@delimiter, @list, 1);

          END
   END   
   RETURN
END

Now create your stored procedure:

    CREATE PROCEDURE ParseListExample
    @id_list as nvarchar(1024)
    AS
    BEGIN

    SET NOCOUNT ON;

    --create a temp table to hold the list of ids
    CREATE TABLE #idTable (ID INT);

    -- use the table valued function to parse the ids into a table.
    INSERT INTO #idTable(ID)
    SELECT Value FROM   dbo.String_to_int_table(@id_list, ',');

    -- join the temp table of ids to the table you want to query...
    SELECT T1.* 
    FROM table1 T1
    JOIN #idTable T2
    on T1.ID = T2.ID

Execution Example:

 exec ParseListExample @id_list='1234,23,56,576,1231,567,122,87876,57553,1216'

I hope this helps...

Answer 5

The dynamic query approach would look like this:

create procedure ShowData @IdList VarChar(255)
as
  exec ('use yourDatabase; select * from MyTable where Id in ('+@IdList+')')