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SQL .Write

Posted on 2016-09-15
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Last Modified: 2016-09-20
The syntax for the .write clause is

.write(expression, @offset, @length)

What does the @offset and @length do?
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Question by:isames
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Megan Brooks earned 500 total points
ID: 41800032
That was a new one on me; I never heard of it before. The length and offset specify where to write the data. I gleaned this information by reading Books Online, where you can find more information. From BOL:

.WRITE (expression,@Offset,@Length)
Specifies that a section of the value of column_name is to be modified. expression replaces @Length units starting from @Offset of column_name. Only columns of varchar(max), nvarchar(max), or varbinary(max) can be specified with this clause. column_name cannot be NULL and cannot be qualified with a table name or table alias.
expression is the value that is copied to column_name. expression must evaluate to or be able to be implicitly cast to the column_name type. If expression is set to NULL, @Length is ignored, and the value in column_name is truncated at the specified @Offset.
@Offset is the starting point in the value of column_name at which expression is written. @Offset is a zero-based ordinal position, is bigint, and cannot be a negative number. If @Offset is NULL, the update operation appends expression at the end of the existing column_name value and @Length is ignored. If @Offset is greater than the length of the column_name value, the Database Engine returns an error. If @Offset plus @Length exceeds the end of the underlying value in the column, the deletion occurs up to the last character of the value. If @Offset plus LEN(expression) is greater than the underlying declared size, an error is raised.
@Length is the length of the section in the column, starting from @Offset, that is replaced by expression. @Length is bigint and cannot be a negative number. If @Length is NULL, the update operation removes all data from @Offset to the end of the column_name value.
For more information, see Remarks.
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Expert Comment

by:Éric Moreau
ID: 41800283
that just mean that if you have a big string and only want to replace a snippet in it, you can using this method
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Author Closing Comment

by:isames
ID: 41807490
Thanks Megan.
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