OPEN
Opens a Transact-SQL server cursor and populates the cursor by executing the Transact-SQL statement specified on the DECLARE CURSOR or SET cursor_variable statement.
Syntax
OPEN { { [ GLOBAL ] cursor_name } | cursor_variable_name }
Arguments
GLOBAL
Specifies that cursor_name refers to a global cursor.
cursor_name
Is the name of a declared cursor. If both a global and a local cursor exist with cursor_name as their name, cursor_name refers to the global cursor if GLOBAL is specified; otherwise, cursor_name refers to the local cursor.
cursor_variable_name
Is the name of a cursor variable that references a cursor.
Remarks
If the cursor is declared with the INSENSITIVE or STATIC option, OPEN creates a temporary table to hold the result set. OPEN fails if the size of any row in the result set exceeds the maximum row size for Microsoft® SQL Server™ tables. If the cursor is declared with the KEYSET option, OPEN creates a temporary table to hold the keyset. The temporary tables are stored in tempdb.
After a cursor has been opened, use the @@CURSOR_ROWS function to receive the number of qualifying rows in the last opened cursor. Depending on the number of rows expected in the result set, SQL Server may choose to populate a keyset-driven cursor asynchronously on a separate thread. This allows fetches to proceed immediately, even if the keyset is not fully populated. For more information, see Asynchronous Population.
To set the threshold at which SQL Server generates keysets asynchronously, set the cursor threshold configuration option. For more information, see sp_configure.
Examples
This example opens a cursor and fetches all the rows.
DECLARE Employee_Cursor CURSOR FOR
SELECT LastName, FirstName
FROM Northwind.dbo.Employees
WHERE LastName like 'B%'
OPEN Employee_Cursor
FETCH NEXT FROM Employee_Cursor
WHILE @@FETCH_STATUS = 0
BEGIN
FETCH NEXT FROM Employee_Cursor
END
CLOSE Employee_Cursor
DEALLOCATE Employee_Cursor