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.
Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
If the cursor is declared with the INSENSITIVE or STATIC option, OPEN creates a temporary table to hold the result set. OPEN fails when the size of any row in the result set exceeds the maximum row size for 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.
SQL Server does not support generating keyset-driven or static Transact-SQL cursors asynchronously. Transact-SQL cursor operations such as OPEN or FETCH are batched, so there is no need for the asynchronous generation of Transact-SQL cursors. SQL Server continues to support asynchronous keyset-driven or static application programming interface (API) server cursors where low latency OPEN is a concern, due to client round trips for each cursor operation.
The following example opens a cursor and fetches all the rows.
DECLARE Employee_Cursor CURSOR FOR SELECT LastName, FirstName FROM AdventureWorks2012.HumanResources.vEmployee 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;