How to split string with delimiter and convert to integer - sql

Question

hi i am writing query in sql server procedure in which i pass comma seprated nvarchar values i want to filter these value in sql server query code is given below
declare #RoleId NVARCHAR(MAX) = '1,2,3'
Declare #RoleTempId int;
Set #RoleTempId = Cast(#RoleId As INT);
BEGIN
SELECT dbo.RolePermission.PermissionId, dbo.Permission.PermissionName
FROM dbo.RolePermission INNER JOIN
dbo.Permission ON dbo.RolePermission.PermissionId = dbo.Permission.PermissionId
WHERE (dbo.RolePermission.RoleId IN (#RoleTempId))
END
this is giving error please guide me about this query thank you.

Answer 1

One simple solution for string splitting is to convert the source (1,2,3) string (which could be declared as VARCHAR and not NVARCHAR if it contains only integers) to XML (<r>1</r><r>2</r><r>3</r>) and then you could shredd this XML and insert every values (integer) into a table variable:
DECLARE #RoleId NVARCHAR(MAX) = '1,2,3'
DECLARE #SelectedRoles TABLE (RoleId INT PRIMARY KEY); -- No duplicates allowed
DECLARE #x XML;
SET #x = N'<r>' + REPLACE((SELECT #RoleId FOR XML PATH('')), N',', N'</r><r>') + N'</r>';
/*
#x content:
<r>1</r><r>2</r><r>3</r>
*/
INSERT #SelectedRoles (RoleId)
SELECT y.XmlCol.value('(.)', 'INT') AS RoleId
FROM #x.nodes('/r') y(XmlCol);
...
WHERE (dbo.RolePermission.RoleId IN (SELECT sr.RoleId FROM #SelectedRoles sr))