查询无效的外部时无法捕获错误 Table

Question

当您根据另一个 Azure SQL 数据库中不存在的 table 创建外部 table 时。

SELECT * 
FROM invalid_external_table

抛出以下错误信息：

Msg 46823, Level 16, State 1, Procedure
Error retrieving data from {azure database}. The underlying error message received was: 'Invalid object name 'dbo.invalid_table'.'.

我正在处理的问题是您似乎无法捕获此错误。

以下代码导致相同的错误：

BEGIN TRY
    SELECT * 
    FROM invalid_external_table 
END TRY
BEGIN CATCH
    PRINT 'caught exception'
END CATCH

我正在 Azure SQL 数据库中查询外部 table，该数据库基于来自另一个 SQL 数据库的 table。

是否可以在查询外部 table 之前捕获此错误或验证外部 table？

Answer 1

根据the documentation：

TRY…CATCH constructs do not trap the following conditions:

Errors that occur during statement-level recompilation, such as object name resolution errors that occur after compilation because of deferred name resolution.

If an error occurs during compilation or statement-level recompilation at a lower execution level (for example, when executing sp_executesql or a user-defined stored procedure) inside the TRY block, the error occurs at a lower level than the TRY…CATCH construct and will be handled by the associated CATCH block.

这也不是外部表特有的，下面会报错：

BEGIN TRY
    SELECT * FROM msdb.dbo.InvalidTable;
END TRY
BEGIN CATCH
    PRINT 'caught exception';
END CATCH

但是如果你动态执行SQL，那么你会到达catch块，例如：

BEGIN TRY
    EXECUTE sp_executeSQL N'SELECT * FROM msdb.dbo.InvalidTable;';
END TRY
BEGIN CATCH
    PRINT 'caught exception';
END CATCH

查询无效的外部时无法捕获错误 Table

Cannot Catch error when querying an invalid External Table

sql-server

azure

external-tables

azure-sql-database