.png)
TEXTVALID (Transact-SQL)
A text, ntext, or image function that checks whether a specific text pointer is valid.
Important
|
|---|
|
This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Alternative functionality is not available. |
Returns 1 if the pointer is valid and 0 if the pointer is not valid. Note that the identifier for the text column must include the table name. You cannot use UPDATETEXT, WRITETEXT, or READTEXT without a valid text pointer.
The following functions and statements are also useful when you work with text, ntext, and image data.
|
Function or statement |
Description |
|---|---|
|
PATINDEX('%pattern%' , expression) |
Returns the character position of a specified character string in text and ntext columns. |
|
DATALENGTH(expression) |
Returns the length of data in text, ntext, and image columns. |
|
SET TEXTSIZE |
Returns the limit, in bytes, of the text, ntext, or image data to be returned with a SELECT statement. |
The following example reports whether a valid text pointer exists for each value in the logo column of the pub_info table.
|
Note
|
|---|
|
To run this example, you must install the pubs database. |
USE pubs;
GO
SELECT pub_id, 'Valid (if 1) Text data'
= TEXTVALID ('pub_info.logo', TEXTPTR(logo))
FROM pub_info
ORDER BY pub_id;
GO
Here is the result set.
pub_id Valid (if 1) Text data ------ ---------------------- 0736 1 0877 1 1389 1 1622 1 1756 1 9901 1 9952 1 9999 1 (8 row(s) affected)
