Updating a record through cursor Free hookup uk
To demonstrate how to use a cursor to update records we'll create a running total of the number of Oscars our films have won.To begin with we'll declare a couple of variables and set their default values.Cursor declarations must appear after variable and condition declarations but before handler declarations.Also keep in mind that the cursor SELECT statement cannot have an INTO clause; it's strictly read-only.
Next, we'll declare our cursor, open it and move it to the first record.The easiest way to declare a cursor that can be used to update records is to simply use the default cursor type: Using the code above will declare a cursor which can used to update records.You can make things a little more obvious by explicitly stating that the cursor is to be used for updating, as shown below: This cursor can be used to update any field from the underlying data set.That allows us to perform operations on every record on a one-by-one basis.The DECLARE statement declares a cursor and associates it with a SELECT statement that retrieves the rows to be traversed by the cursor.
While we won't be looking at the use of multiple cursors within the same stored proc, it is entirely possible to have multiple cursors in the same code block, but each cursor must have a unique name. HANDLER statement specifies a handler that deals with one or more conditions.