How to split and replace with stored procedure? - sql

Question

I want to replace all e_Mail column where in #tablename with my users table (my main table).
For example:
#tablename
[name] [eMail] // columns
------------------------------------------------------
name surname blahblah#gmail.com
My users table
[name] [eMail]
----------------------------------------
name surname blahblah#hotmail.com
I want to update this row's eMail column as 'blahblah#hotmail.com' in #tablename.
What will procedure do?
1- Get first value of eMail column from #tablename
2- Split value (split char: #) and get first value (for example, if value blahblah#gmail.com, get gmail.com)
3- Search first value in users table
4- When the find value in users table, (Code must find blahblah#hotmail.com) Update eMail as blahblah#hotmail.com in #tablename
5- Get second value of eMail column from #tablename
.
.
.
So, I write a stored procedure. But this procedure is not working. Where is the problem?
Create Proc update_eMail
(#tablename nvarchar(50),
#columnname nvarchar(50))
AS
Begin
Declare #get_oldeMail nvarchar(100)
Declare #get_eMail nvarchar(100)
Declare #get_SplitValue nvarchar(100)
Declare #get_oldSplitValue nvarchar(100)
Declare #rowNumber int
Declare #users_rowNumber int
Declare #i int
Declare #j int
Declare #q_getRowNumber NVARCHAR(MAX)
Declare #q_getoldeMail NVARCHAR(MAX)
Declare #q_UpdateQuery NVARCHAR(MAX)
SET #q_getRowNumber = N'SELECT Count(ID)
FROM ' + QUOTENAME(#tablename)
EXECUTE #rowNumber = sp_executesql #q_getRowNumber
/*Set #rowNumber = (Select Count(ID) from #tablename)*/
Set #users_rowNumber = (Select Count(ID) from tblusers)
Set #i = 1
Set #j = 1
While(#i <= #rowNumber)
BEGIN
Set #q_getoldeMail = '(SELECT Lower(#columnname) FROM (
SELECT
ROW_NUMBER() OVER (ORDER BY ID) AS rownumber
,ID
,[Name]
,[Description]
,[Status]
,[AssignedTo]
,[AssignedToMail]
,[CC]
FROM' + #tablename + '
) AS ar
WHERE rownumber = #i)'
EXECUTE #get_oldeMail = sp_executesql #q_getoldeMail
Set #get_oldeMail = REPLACE(#get_oldeMail,'ı','i')
WHILE LEN(#get_oldeMail) > 0
BEGIN
IF CHARINDEX('#',#get_oldeMail) > 0
SET #get_oldSplitValue = SUBSTRING(#get_oldeMail,0,CHARINDEX('#',#get_oldeMail))
ELSE
BEGIN
SET #get_oldSplitValue = #get_oldeMail
SET #get_oldeMail = ''
END
SET #get_oldeMail = REPLACE(#get_oldeMail,#get_oldSplitValue + '#' , '')
END
While(#j <= #users_rowNumber)
BEGIN
Set #get_eMail = (SELECT Replace(Lower(eMail),'ı','i') FROM (
SELECT
ROW_NUMBER() OVER (ORDER BY ID) AS rownumber
,eMail
FROM tblusers) AS ar
WHERE rownumber = #j)
WHILE LEN(#get_eMail) > 0
BEGIN
IF CHARINDEX('#',#get_eMail) > 0
SET #get_SplitValue = SUBSTRING(#get_eMail,0,CHARINDEX('#',#get_eMail))
ELSE
BEGIN
SET #get_SplitValue = #get_eMail
SET #get_eMail = ''
END
SET #get_eMail = REPLACE(#get_eMail,#get_SplitValue + '#' , '')
END
if(#get_splitValue = #get_oldSplitValue)
begin
Set #q_UpdateQuery = 'Update ar Set ' + #columnname + ' = ' + #get_email + ' Where rownumber = ' +#i
EXECUTE sp_executesql #q_UpdateQuery
break
end
SET #j = #j+1
END
SET #i = #i+1
END
End
Thanks in advance.