Update function in trigger sql server 2005

Listing B creates the audit table, which I will use to house the data changes. Listing C creates the trigger on your SalesHistory table. The real power of this trigger is the sys. Our trigger then casts the field names that were included in the update statement as an XML document so that we can store which fields were updated in our audit table. Editor's Picks. The best programming languages to learn in Check for Log4j vulnerabilities with this simple-to-use script.

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Leave a Reply Cancel reply Enter your comment here Functions are meant to make coding easier. SQL Server includes a set of special functions that can only be used inside of triggers.

Those functions allow us to get information that otherwise we wouldn't be able to get easily. This function accepts only one parameter which is, of course the name of a column from the table or view associated with the trigger. As we saw, the UPDATE function for triggers is useful to know which columns were changed, but it falls short when you need to check for multiple columns.

Since every column is represented by a bit, we can infer the size of the stream by dividing the number of columns by 8 and rounding up the result to the nearest integer. The bytes of the VARBINARY stream are ordered from left to right, so if you have a table with 15 columns the first byte from the left will contain the bitmask value for columns 1 to 8 the first eight columns.

Meanwhile the second byte from the left will contain the bitmask value for columns 9 to Additionally, each byte of the VARBINARY stream is ordered from right to left, so the first bit from the right of the first byte starting from the left is the masked value for the first column.