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T-SQL 語句(九)—— 遊標

SELECT name,age FROM employee -- 定義遊標 OPEN Cursor_employee -- 開啟遊標 DECLARE @name NVARCHAR(15) DECLARE @age INT FETCH NEXT FROM Cursor_employee INTO @name,@age WHILE (@@FETCH_STATUS = 0) BEGIN PRINT 'name: ' + @name PRINT 'age: ' + CAST(@age AS VARCHAR(3)) PRINT '' FETCH NEXT FROM Cursor_employee INTO
@name,@age END CLOSE Cursor_employee -- 關閉遊標 DEALLOCATE Cursor_employee -- 刪除遊標,從記憶體中刪除,釋放系統資源 DECLARE @cursor_var STATIC CURSOR -- 定義遊標變數,指定為靜態遊標,DIYNAMIC 遊標 @@CURSOR_ROWS 總是-1 DECLARE @name NVARCHAR(20) SET @cursor_var = CURSOR FOR SELECT * FROM employee OPEN @cursor_var FETCH NEXT FROM @cursor_var WHERE
(@@FETCH_STATUS = 0) BEGIN SELECT @name = name FROM CURRENT OF cursor_var -- 當前行 PRINT @name FETCH NEXT FROM @cursor_var END PRINT '列印靜態遊標總記錄數 @@CURSOR_ROWS:' PRINT @@CURSOR_ROWS CLOSE @cursor_var DEALLOCATE @cursor_var