oracle存储过程递归调用_函数的间接递归调用

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存储过程和函数一样也可以递归调用，调用方法类似。如下是求某个数以内的数字求和：

CREATE PROCEDURE aProc_Test
    @INPUT int,
    @Sum int output
AS
BEGIN
    SET NOCOUNT ON;
    if(@Sum is null)
		set @Sum=0
    if(@INPUT>0)
    begin
		set @INPUT=@INPUT-1
		set @Sum=@Sum+@INPUT
		EXEC aProc_Test @INPUT,@Sum output 
	end
END
GO

--调用存储过程，对1~10的数字求和
DECLARE @OUT int,@output int
EXEC aProc_Test 11,@output output
SELECT [OUTPUT值]=@output
go

输出结果：

注意：递归存储过程一般会用到 output 或 return，两者返回值类型上有一定的区别，output 基本上没有限制，但 return 返回的一般是 int 类型。

下面是审核流中根据某一个节点查询下一个节点，就是用的 return 实现

CREATE PROCEDURE [dbo].[up_Flow_JudegNextStep]
	@StepId int,
	@FRId int,
	@PosId int
AS
BEGIN
	SET NOCOUNT ON;
	declare @SRId int;
	select @SRId = SRId from FL_FlowStep where StepId = @StepId;
	--插入当前步骤
	exec up_Flow_AddPath @FRId = @FRId, @StepId = @StepId, @SRId = @SRId, @ObjId = @PosId;
	
	--处理分支
	declare judgeCursor Cursor For
	select FLDField,Operator,Value,NextStep from FL_FlowStepJudge a left join FL_FlowFormField b
	on a.FLDId = b.FLDId where StepId = @StepId;
	open judgeCursor;
	
	declare @field varchar(10),@Operator varchar(10),@value varchar(10), @next int;
	fetch next from judgeCursor into @field,@Operator,@value,@next;
	while(@@FETCH_STATUS=0)
	begin
		declare @sql nvarchar(100);
		declare @has int;
		set @sql = 'select @a = count(1) from FL_FlowData where FRId='+CAST(@FRId as varchar(10))+' and '+@field+@Operator+''''+@value+'''';
		exec sp_executesql @sql,N'@a int output',@has output;
		if @has > 0
		begin
			close judgeCursor;
			deallocate judgeCursor;
			if @next > 0
			begin
				exec up_Flow_JudegNextStep @StepId=@next,@FRId=@FRId,@PosId=@PosId;
			end
			return 1;
		end
		fetch next from judgeCursor into @field,@Operator,@value,@next;
	end
	close judgeCursor;
	deallocate judgeCursor;
	return 0;
	--处理分支结束
END