sql2008游标FORWARD_ONLY STATIC 的使用方式

CREATE TABLE #xms_staff_department
(
  id int,
  name varchar(128),
  parent_id int,
  parent_path varchar(512) ,
  depth smallint,
  is_delete tinyint,
  sort smallint
)
INSERT INTO #xms_staff_department
SELECT id,name,0,'0,'+CONVERT(VARCHAR,id),1, (CASE WHEN IsVaild = 1 THEN 0 ELSE 1 END), dOrder FROM dept WHERE Pid = 0

DECLARE @id				INT
DECLARE @parent_path	VARCHAR(128)
DECLARE @cursor1			CURSOR
SET @cursor1 = CURSOR FORWARD_ONLY STATIC FOR
SELECT id, parent_path FROM #xms_staff_department
OPEN @cursor1
FETCH NEXT FROM @cursor1 INTO @id, @parent_path
WHILE (@@FETCH_STATUS = 0)
BEGIN

	INSERT INTO #xms_staff_department
	SELECT id,name,Pid, @parent_path+','+CONVERT(VARCHAR,id),2, (CASE WHEN IsVaild = 1 THEN 0 ELSE 1 END), dOrder FROM dept WHERE Pid = @id

	DECLARE @cursor2			CURSOR
	DECLARE @id2				INT
	DECLARE @parent_path2	VARCHAR(128)
	SET @cursor2 = CURSOR FORWARD_ONLY STATIC FOR
	SELECT id, parent_path FROM #xms_staff_department WHERE parent_id = @id
	OPEN @cursor2
	FETCH NEXT FROM @cursor2 INTO @id2, @parent_path2
	WHILE (@@FETCH_STATUS = 0)
	BEGIN 

		INSERT INTO #xms_staff_department
		SELECT id,name,Pid, @parent_path+','+CONVERT(VARCHAR,id),3, (CASE WHEN IsVaild = 1 THEN 0 ELSE 1 END), dOrder FROM dept WHERE Pid = @id2

		DECLARE @cursor3			CURSOR
		DECLARE @id3				INT
		DECLARE @parent_path3	VARCHAR(128)
		SET @cursor3 = CURSOR FORWARD_ONLY STATIC FOR
		SELECT id, parent_path FROM #xms_staff_department WHERE parent_id = @id2
		OPEN @cursor3
		FETCH NEXT FROM @cursor3 INTO @id3, @parent_path3
		WHILE (@@FETCH_STATUS = 0)
		BEGIN

			INSERT INTO #xms_staff_department
			SELECT id,name,Pid, @parent_path+','+CONVERT(VARCHAR,id),4, (CASE WHEN IsVaild = 1 THEN 0 ELSE 1 END), dOrder FROM dept WHERE Pid = @id3

			DECLARE @cursor4			CURSOR
			DECLARE @id4				INT
			DECLARE @parent_path4	VARCHAR(128)
			SET @cursor4 = CURSOR FORWARD_ONLY STATIC FOR
			SELECT id, parent_path FROM #xms_staff_department WHERE parent_id = @id3
			OPEN @cursor4
			FETCH NEXT FROM @cursor4 INTO @id4, @parent_path4
			WHILE (@@FETCH_STATUS = 0)
			BEGIN

				INSERT INTO #xms_staff_department
				SELECT id,name,Pid, @parent_path+','+CONVERT(VARCHAR,id),5, (CASE WHEN IsVaild = 1 THEN 0 ELSE 1 END), dOrder FROM dept WHERE Pid = @id4			

				FETCH NEXT FROM @cursor4 INTO @id4, @parent_path4
			END
			CLOSE @cursor4
			DEALLOCATE @cursor4			

			FETCH NEXT FROM @cursor3 INTO @id3, @parent_path3
		END
		CLOSE @cursor3
		DEALLOCATE @cursor3	

		FETCH NEXT FROM @cursor2 INTO @id2, @parent_path2
	END
	CLOSE @cursor2
	DEALLOCATE @cursor2

	FETCH NEXT FROM @cursor1 INTO @id, @parent_path
END
CLOSE @cursor1
DEALLOCATE @cursor1

select * from #xms_staff_department
drop table #xms_staff_department

上述是个简单的sql游标的使用方法,写法很水，但需要注意的是

SET @cursor = CURSOR FORWARD_ONLY STATIC FOR "标注红色的使用"

备注： SQL游标的执行效率之静态游标的高效率执行

STATIC静态游标创建将由该游标使用的数据的临时复本,对游标的所有请求都从tempdb 中的这一临时表中得到应答,因此在对该游标进行提取操作时返回的数据中不反映对基表所做的修改,并且该游标不允许修改

FORWARD_ONLY 指定数据只能从第一条到最后一条