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Tip of the Day
Language: Enterprise
Expertise: Intermediate
Jul 2, 2001

Manipulating Text Field Data in a SQL Stored Procedure


The code below is functionally equivalent to a VB Replace function, but, instead, it allows you to perform an action in a Text type field in a SQL Server Stored Procedure. This functionality can be especially useful in content management type situations, allowing you, for example, to replace all carriage returns with an HTML
tag.
 
CREATE Procedure sp_replace
AS
DECLARE	        @pointer binary(16),
		@iPatternLoc Integer,
		@rowId Integer
--@rowId is an arbitrary row identifier this could be passed in by
-- a parameter

SELECT @rowId = 1

--Select Satement below retrieves first location of a searched
--pattern (in this case carriege return) and assigns it to
--@iPatternLoc variable
SELECT @iPatternLoc = PATINDEX('%' + CHAR(13) + '%',text_field)
FROM someTable WHERE someTableId = @rowId

--This Select statement returns a pointer variable pointed to the
text_field
--column.
SELECT @pointer = TEXTPTR(text_field)
FROM someTable
WHERE text_field = @rowId

Select @iPatternLoc = @iPatternLoc - 1
--Loop through all instances of Char(13) and replace them with
--
using the UPDATETEXT function WHILE @iPatternLoc > -1 BEGIN UPDATETEXT text_field @pointer @iPatternLoc 4 '
' SELECT @iPatternLoc = PATINDEX('%' + CHAR(13) + '%',text_field) FROM someTable WHERE someTableId = @rowId Select @iPatternLoc = @iPatternLoc - 1 END
Martin Gruszka
 
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