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.
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Transact-SQL Syntax Conventions
Syntax
TEXTVALID ( 'table.column' ,text_ ptr )
Arguments
table
Is the name of the table that will be used.column
Is the name of the column that will be used.text_ptr
Is the text pointer to be checked.
Return Types
int
Remarks
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. |
Examples
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)