如何在 SQL Server 中使用 Try Catch 处理错误？

从 SQL Server 2005 开始，我们在TRY 和 CATCH块的帮助下提供了结构错误处理机制。使用TRY-CATCH的语法如下所示。

BEGIN TRY
--这里写可能导致错误的语句
END TRY
BEGIN CATCH
--当错误发生后,这里的语句将会被执行
END CATCH
-- 其他语句

有可能抛出异常的SQL 语句需要放在BEGIN TRY和END TRY块之间。如果在 TRY 块中发生异常，则控制权立即转移到相应的CATCH块。如果 TRY 块中没有发生异常，则直接跳过CATCH块，执行CATCH块之后的语句。

注意：被 CATCH 捕获的错误不会返回给调用应用程序。如果要将错误信息返回给调用应用程序，则需要将 RAISERROR() 函数显式与 catch 块一起使用。在之前的文章中，我们讨论了如何使用 RAISERROR() 函数显式地引发错误。参考: SQL Server 中的异常处理

示例：了解 SQL Server 中的 Try-Catch 实现。

在下面的示例中，我们使用 SQL Server TRY CATCH 实现和用户定义的错误语句来创建一个用于除以 2 个变量值的存储过程。

IF OBJECT_ID('spDivideTwoNumbers','P') IS NOT NULLDROP PROCEDURE spDivideTwoNumbers
GO
CREATE PROCEDURE spDivideTwoNumbers(
@Number1 INT,
@Number2 INT
)
AS
BEGINDECLARE @Result INTSET @Result = 0BEGIN TRYSET @Result = @Number1 / @Number2PRINT '结果是: ' + CAST(@Result AS VARCHAR)END TRYBEGIN CATCHPRINT '第二个数字不能为0'END CATCH
END

让我们来测试一下这个存储过程

exec spDivideTwoNumbers 100,1

输出: 结果是: 100

exec spDivideTwoNumbers 100,0

输出: 第二个数字不能为0

当我们用正确的值执行上述存储过程时，程序就不会出现错误。这意味着在执行完 try 块中的所有语句后，控件直接跳转到存在于 catch 块之后的语句，而不执行 catch 块。

如果在执行过程中，即在try块中发生任何错误，那么在这种情况下，从发生错误的行开始，控制权直接跳转到catch块。所以 try 块中的其余语句将不会执行，而 catch 块将执行。

注意：在上面的程序中，当错误发生时，我们会显示一条用户自定义的错误消息“第二个数字不能为0”。然而，我们还可以通过调用函数 Error_Message 来显示原始错误消息。为了测试这个重写catch块内的代码如下

ALTER PROCEDURE spDivideTwoNumbers(
@Number1 INT,
@Number2 INT
)
AS
BEGINDECLARE @Result INTSET @Result = 0BEGIN TRYSET @Result = @Number1 / @Number2PRINT '结果是: ' + CAST(@Result AS VARCHAR)END TRYBEGIN CATCHPRINT ERROR_MESSAGE()END CATCH
END

再次执行: exec spDivideTwoNumbers 100,0
输出: 遇到以零作除数错误。

ERROR_MESSAGE 是系统函数, 此函数返回导致 TRY...CATCH 构造的 CATCH 块执行的错误消息文本。

在 SQL Server 中使用 try-catch 的示例

我们将使用下面的 Product 和 ProductSales 表来了解如何使用 RaiseError 和 @ERROR 系统定义函数来处理 SQL Server 中的错误。

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Product (产品表)

ProductID Name Price Quantity
101 Laptop 15000 100
102 Desktop 20000 150
104 Mobile 3000 200
105 Tablet 4000 250

ProductSales (产品销售表)

ProductSalesID ProductID QuantitySold
1 101 10
2 102 15
3 104 30
4 105 35

请使用以下 SQL 脚本创建并使用示例数据填充 Product 和 ProductSales 表。

IF OBJECT_ID('dbo.Product','U') IS NOT NULLDROP TABLE dbo.Product
IF OBJECT_ID('dbo.ProductSales','U') IS NOT NULLDROP TABLE dbo.ProductSales
GO
CREATE TABLE Product
(ProductID INT PRIMARY KEY, Name VARCHAR(40), Price INT,Quantity INT)
GO
INSERT INTO Product VALUES(101, 'Laptop', 15000, 100)
INSERT INTO Product VALUES(102, 'Desktop', 20000, 150)
INSERT INTO Product VALUES(103, 'Mobile', 3000, 200)
INSERT INTO Product VALUES(104, 'Tablet', 4000, 250)
GO
CREATE TABLE ProductSales
(ProductSalesId INT PRIMARY KEY,ProductId INT,QuantitySold INT
)
GO
INSERT INTO ProductSales VALUES(1, 101, 10)
INSERT INTO ProductSales VALUES(2, 102, 15)
INSERT INTO ProductSales VALUES(3, 103, 30)
INSERT INTO ProductSales VALUES(4, 104, 35)
GO

在 SQL Server 中使用 TRY Catch 实现产品销售的存储过程

CREATE PROCEDURE spSellProduct
@ProductID INT,
@QuantityToSell INT
AS
BEGIN-- 首先我们需要检查待销售产品的可用库存DECLARE @StockAvailable INTSELECT @StockAvailable = QuantityAvailable FROM Product WHERE ProductId = @ProductId--如果可用库存小于要销售的数量,抛出错误IF(@StockAvailable< @QuantityToSell)BEGINRaiserror('可用库存不足',16,1)END-- 如果可用库存充足ELSEBEGINBEGIN TRY-- 我们需要开启一个事务BEGIN TRANSACTION-- 首先做减库存操作UPDATE Product SET Quantity = (Quantity - @QuantityToSell) WHERE ProductID = @ProductID-- 计算当前最大的产品销售ID,即 MaxProductSalesIdDECLARE @MaxProductSalesId INTSELECT @MaxProductSalesId = CASE WHEN  MAX(ProductSalesId) IS NULL THEN 0 ELSE MAX(ProductSalesId) END FROM ProductSales-- 把 @MaxProductSalesId 加一, 所以我们会避免主键冲突 --(解释下,建表的时候,没有设置主键自增,所以需要人工处理自增)Set @MaxProductSalesId = @MaxProductSalesId + 1-- 把销售的产品数量记录到ProductSales表中INSERT INTO ProductSales VALUES (@MaxProductSalesId, @ProductId, @QuantityToSell)-- 最后,提交事务COMMIT TRANSACTIONEND TRYBEGIN CATCH-- 如果发生了异常,回滚事务ROLLBACK TRANSACTION-- 输出错误详情SELECT ERROR_NUMBER() as ErrorNumber,ERROR_MESSAGE() as ErrorMessage,ERROR_PROCEDURE() as ErrorProcedure,ERROR_STATE() as ErrorState,ERROR_SEVERITY() as ErrorSeverity,ERROR_LINE() as ErrorLineEND CATCHEnd
END

折叠

在存储过程 spSellProduct 中，Begin Transaction 和 Commit Transaction 语句被包装在 Begin Try 和 End Try 块之间。如果包含在 BEGIN TRY 和 END TRY 块中的代码没有发生错误，则执行 COMMIT TRANSACTION 语句并将更改永久保存到数据库。

如果在 try 块中发生错误，则立即跳转到 CATCH 块，并且在 CATCH 块中，我们正在回滚事务。因此，使用 Try/Catch 构造处理错误比使用 SQL Server 中的 @@Error 系统函数要容易得多。

SQL Server 还提供了一些我们可以在 CATCH 块范围内使用的内置函数，这些函数用于检索有关发生的错误的更多信息，如果这些函数在 CATCH 块范围之外执行，它们将返回 NULL。

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