如何将 OUTPUT DELETED 的结果分配给输出参数？

Question

我有以下生成下一个可用提单编号的查询。

ALTER PROCEDURE [dbo].[GetNextTruckBol]
    @FacilityId INT,
    @Count INT = 1
AS
BEGIN
    SET NOCOUNT ON;
    UPDATE Facilities
    SET NextTruckBol = NextTruckBol + @Count
    OUTPUT DELETED.NextTruckBol
    WHERE Id = @FacilityId
END

但现在我需要修改它，以便将结果值分配给 OUTPUT 参数。

我知道如何声明 OUTPUT 参数。如何将 OUTPUT DELETED.NextTruckBol 的值分配给该参数？

Answer 1

根据 UPDATE 文档

Variable names can be used in UPDATE statements to show the old and new values affected, but this should be used only when the UPDATE statement affects a single record. If the UPDATE statement affects multiple records, to return the old and new values for each record, use the OUTPUT clause.

因此，如果您知道 UPDATE 只会影响最多一行（因为 Id 被限制为唯一）并且您不想弄乱 table您可以使用的变量

SET @variable = column, column = expression, which sets the variable to the pre-update value of the column.

那就是

CREATE OR ALTER PROCEDURE [dbo].[GetNextTruckBol]
    @FacilityId INT,
    @Count INT = 1,
    @NextTruckBol INT OUTPUT
AS
BEGIN
    SET NOCOUNT ON;

    UPDATE Facilities
    SET @NextTruckBol = NextTruckBol,
        NextTruckBol = NextTruckBol + @Count
    WHERE Id = @FacilityId
END

如何将 OUTPUT DELETED 的结果分配给输出参数？

How to assign result of OUTPUT DELETED to an output parameter?

sql

sql-server

tsql

output-parameter