[英]Multiple update statements in one StoredProcedure
我想知道是否可以在存储过程中有多个 Update 语句
像这样的东西:
Update Table1 set field1 = @new_value where id = @table1_id
Update Table2 set field2 = @new_value where id = @table2_id
Update Table3 set field3 = @new_value where id = @table3_id
现在我正在单独执行它们,但由于它们仅一起使用,我想知道它们是否可以仅位于一个 SP 中。
是的,这是可能的:
CREATE PROCEDURE prc_update (@table1_id INT, @table2_id INT, @table3_id INT, @new_value INT)
AS
BEGIN
UPDATE Table1
SET field1 = @new_value
WHERE id = @table1_id
UPDATE Table2
SET field2 = @new_value
WHERE id = @table2_id
UPDATE Table3
SET field3 = @new_value
WHERE id = @table3_id
END
是的,这很好用。
在更新之前也把它放在存储过程中:
set nocount on
这可以防止存储过程为没有结果的查询创建结果集。 否则每次更新都会产生一个空的结果集,并发送回客户端。
您还应该将这些语句包装在事务中,以便在失败时所有语句都回滚。
下面是带有事务、nocounton 和多个更新查询的存储过程。
CREATE PROCEDURE prc_update (@table1_id INT, @table2_id INT, @table3_id INT,
@new_value INT)
AS
BEGIN
BEGIN TRY
Set Nocount ON
Begin Transaction
Save Transaction BeforeTransactionSavePoint
UPDATE Table1
SET field1 = @new_value
WHERE id = @table1_id
UPDATE Table2
SET field2 = @new_value
WHERE id = @table2_id
UPDATE Table3
SET field3 = @new_value
WHERE id = @table3_id
Commit Transaction
END TRY
BEGIN CATCH
If @@TRANCOUNT > 0
Rollback Tran BeforeTransactionSavePoint
DECLARE
@ErMessage NVARCHAR(2048),
@ErSeverity INT,
@ErState INT
SELECT
@ErMessage = ERROR_MESSAGE(),
@ErSeverity = ERROR_SEVERITY(),
@ErState = ERROR_STATE()
RAISERROR (@ErMessage,@ErSeverity,@ErState )
END
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