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cURSOR USaGe
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If you write a cursor that performs the same operation against every row retrieved by the cursor, you should rewrite the process to use a more efficient set-based operation.
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Lesson 1: Stored Procedures
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The generic syntax for declaring a cursor is
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DECLARE cursor_name CURSOR [ LOCAL | GLOBAL ] [ FORWARD_ONLY | SCROLL ] [ STATIC | KEYSET | DYNAMIC | FAST_FORWARD ] [ READ_ONLY | SCROLL_LOCKS | OPTIMISTIC ] [ TYPE_WARNING ] FOR select_statement [ FOR UPDATE [ OF column_name [ ,...n ] ] ]
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The following statements show three different ways of declaring the same cursor:
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DECLARE curproducts CURSOR FAST_FORWARD FOR SELECT ProductID, ProductName, ListPrice FROM Products.Product GO
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DECLARE curproducts CURSOR READ_ONLY FOR SELECT ProductID, ProductName, ListPrice FROM Products.Product GO
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DECLARE curproducts CURSOR FOR SELECT ProductID, ProductName, ListPrice FROM Products.Product FOR READ ONLY GO
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Once the cursor has been declared, you issue an OPEN command to execute the SELECT statement:
OPEN curproducts
You then need to retrieve data from the row in the cursor by using a FETCH statement. When you execute FETCH for the first time, a pointer is placed at the first row in the cursor result set. Each time a FETCH is executed, the cursor pointer is advanced one row in the result set until you run out of rows in the result set. Each execution of FETCH also sets a value for the global variable @@FETCH_STATUS. You usually use a WHILE loop to iterate across the cursor, fetching a row each iteration through the loop. You iterate the WHILE loop so long as @@FETCH_STATUS = 0. Here is an example:.
DECLARE @ProductID @ProductName @ListPrice INT, VARCHAR(50), MONEY
DECLARE curproducts CURSOR FOR SELECT ProductID, ProductName, ListPrice FROM Products.Product FOR READ ONLY
OPEN curproducts
FETCH curproducts INTO @ProductID, @ProductName, @ListPrice
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WHILE @@FETCH_STATUS = 0 BEGIN SELECT @ProductID, @ProductName, @ListPrice FETCH curproducts INTO @ProductID, @ProductName, @ListPrice END
CLOSE curproducts DEALLOCATE curproducts
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Set-baSeD PROceSSinG
If you are writing stored procedures that have cursors (especially multilevel cursors), you should reevaluate the process you are trying to write. You can probably replace the cursors with a set-based process that is more efficient.
You can declare four different types of cursors:
The fastest performing cursor type because it allows you only to move forward one row at a time. Scrolling (discussed later in this section) is not supported. A FAST_FORWARD cursor is the same as declaring a FORWARD_ONLY, READ_ONLY cursor. FAST_FORWARD is the default option for cursors.
FAST_FORWARD STATIC The result set is retrieved and stored in a temporary table in the tempdb database. All fetches go against the temporary table and modifications to the underlying tables for the cursor are not visible. A STATIC cursor supports scrolling, but modifications are not allowed. KEYSET The set of keys that uniquely identify each row in the cursor result set is stored in a temporary table in tempdb. As you scroll within the cursor, non-key columns are retrieved from the underlying tables. Therefore, any modifications to rows are reflected as the cursor is scrolled. Any inserts into the underlying table are not accessible to the cursor. If you attempt to access a row that has been deleted, @@FETCH_STATUS returns 2. DYNAMIC The most expensive cursor to use. The cursor reflects all changes made to the underlying result set, including newly inserted rows as the cursor is scrolled. The position and order of rows within the cursor can change each time a fetch is made. The FETCH ABSOLUTE option is not available for dynamic cursors.
By default, all cursors are updatable. To make modifications to underlying table rows, you can execute an UPDATE or DELETE statement with the WHERE CURRENT OF <cursor name> clause to modify or delete the row in the underlying table that the cursor pointer is currently accessing.
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