December 2006
Beginner
912 pages
24h 44m
English
Content preview from Professional SQL Server™ 2005 Programming
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A.11. Text and Image Functions
The text and image functions perform operations on text or image data. They are:
PATINDEX (This was covered in the "String Functions" section earlier in the appendix.)
TEXTPTR
TEXTVALID
A.11.1. TEXTPTR
The TEXTPTR function checks the value of the text pointer that corresponds to a text, ntext, or image column and returns a varbinary value. The text pointer should be checked to ensure that it points to the first text page before running READTEXT, WRITETEXT, and UPDATE statements. The syntax is as follows:
TEXTPTR(<column>)
A.11.2. TEXTVALID
The TEXTVALID function checks whether a specified text pointer is valid. The syntax is as follows:
TEXTVALID('<table.column>', <text_ptr>)
The table.column parameter specifies the name of the table and column to be used. The text_ptr parameter specifies the text pointer to be checked.
This function will return 0 if the pointer is invalid and 1 if the pointer is valid.
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