UPDATETEXT
Updates an existing text, ntext, or image field. Use UPDATETEXT to change only a portion of a text, ntext, or image column in place. Use WRITETEXT to update and replace an entire text, ntext, or image field.
Syntax
UPDATETEXT { table_name.dest_column_name dest_text_ptr }
{ NULL | insert_offset }
{ NULL | delete_length }
[ WITH LOG ]
[ inserted_data
| { table_name.src_column_name src_text_ptr } ]
Arguments
table_name.dest_column_name
Is the name of the table and text, ntext, or image column to be updated. Table names and column names must conform to the rules for identifiers. For more information, see Using Identifiers. Specifying the database name and owner names is optional.
dest_text_ptr
Is a text pointer value (returned by the TEXTPTR function) that points to the text, ntext, or image data to be updated. dest_text_ptr must be binary(16).
insert_offset
Is the zero-based starting position for the update. For text or image columns, insert_offset is the number of bytes to skip from the start of the existing column before inserting new data. For ntext columns, insert_offset is the number of characters (each ntext character uses 2 bytes). The existing text, ntext, or image data beginning at this zero-based starting position is shifted to the right to make room for the new data. A value of 0 inserts the new data at the beginning of the existing data. A value of NULL appends the new data to the existing data value.
delete_length
Is the length of data to delete from the existing text, ntext, or image column, starting at the insert_offset position. The delete_length value is specified in bytes for text and image columns and in characters for ntext columns. Each ntext character uses 2 bytes. A value of 0 deletes no data. A value of NULL deletes all data from the insert_offset position to the end of the existing text or image column.
WITH LOG
Ignored in Microsoft® SQL Server™ 2000. In this release, logging is determined by the recovery model in effect for the database.
inserted_data
Is the data to be inserted into the existing text, ntext, or image column at the insert_offset location. This is a single char, nchar, varchar, nvarchar, binary, varbinary, text, ntext, or image value. inserted_data can be a literal or a variable.
table_name.src_column_name
Is the name of the table and text, ntext, or image column used as the source of the inserted data. Table names and column names must conform to the rules for identifiers.
src_text_ptr
Is a text pointer value (returned by the TEXTPTR function) that points to a text, ntext, or image column used as the source of the inserted data.
Remarks
Newly inserted data can be a single inserted_data constant, table name, column name, or text pointer.
| Update action | UPDATETEXT parameters |
|---|---|
| To replace existing data | Specify a nonnull insert_offset value, a nonzero delete_length value, and the new data to be inserted. |
| To delete existing data | Specify a nonnull insert_offset value and a nonzero delete_length. Do not specify new data to be inserted. |
| To insert new data | Specify the insert_offset value, a delete_length of 0, and the new data to be inserted. |
In SQL Server 2000, in row text pointers to text, ntext, or image data may exist but be invalid. For information about the text in row option, see sp_tableoption. For information about invalidating text pointers, see sp_invalidate_textptr.
To initialize text columns to NULL, use UPDATETEXT when the compatibility level is equal to 65. If the compatibility level is equal to 70, use WRITETEXT to initialize text columns to NULL; otherwise, UPDATETEXT initializes text columns to an empty string. For information about setting the compatibility level, see sp_dbcmptlevel.
Permissions
UPDATETEXT permissions default to those users with SELECT permissions on the specified table. Permissions are transferable when SELECT permissions are transferred.
Examples
This example puts the text pointer into the local variable @ptrval, and then uses UPDATETEXT to update a spelling error.
USE pubs
GO
EXEC sp_dboption 'pubs', 'select into/bulkcopy', 'true'
GO
DECLARE @ptrval binary(16)
SELECT @ptrval = TEXTPTR(pr_info)
FROM pub_info pr, publishers p
WHERE p.pub_id = pr.pub_id
AND p.pub_name = 'New Moon Books'
UPDATETEXT pub_info.pr_info @ptrval 88 1 'b'
GO
EXEC sp_dboption 'pubs', 'select into/bulkcopy', 'false'
GO