Re: Function that replaces ntext and compares ntext with nvarchar
- From: Erland Sommarskog <esquel@xxxxxxxxxxxxx>
- Date: Wed, 28 Nov 2007 22:42:09 +0000 (UTC)
(verb13@xxxxxxxxxxx) writes:
I am running this query to an sql server 2000 database from my asp
code:
"select * from MyTable where
MySqlServerRemoveStressFunction(MyNtextColumn) = '" &
MyAdoRemoveStressFunction(MyString) & "'"
The problem is that the replace function doesn't work with the ntext
datatype (so as to replace the stresses with an empty string). I had
to implement the MySqlServerRemoveStressFunction, i.e. a function that
takes a column name as a parameter and returns the text contained in
this column having replaced some letters of the text (the letters with
stress). Unfortunately, I could not do that because user-defined
functions cannot return a value of ntext.
So I have the following idea:
"select * from MyTable where
CheckIfTheyAreEqualIngoringTheStesses(MyNtextColumn, '" & MyString &
"')"
How can I implement the CheckIfTheyAreEqualIngoringTheStesses
function? (I don't know how to combine these functions to do what I
want: TEXTPTR, UPDATETEXT, WRITETEXT, READTEXT)
I will have to admit that I don't really follow what this
CheckIfTheyAreEqualIngoringTheStesses is supposed to achieve. But
there are a lot of problems working with ntext. In SQL 2005 there
is a new data type nvarchar(MAX) which has the same limit as ntext,
but without the limitations.
However, if I understand you right, you want to make an accent-insensitive
comparision, so that "résumé" = "resume". This you can do easily without
any replace business, just use an accent-insentive collation:
SELECT * FROM MyTable
WHERE MyNtextColumn
COLLATE Finnish_Swedish_CI_AI = ?
(As for the question mark, that's an indiciation that you should use
parameterised statements and not interpolate parameters into your SQL
commands.)
Note that Finnish_Swedish_CI_AI is just an example, and you should pick
the CI_AI collation that matches the language(s) you work with.
--
Erland Sommarskog, SQL Server MVP, esquel@xxxxxxxxxxxxx
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
.
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