SQL Select基於可用服務器/表

Question

我有一個SSRS報告中的共享數據集，用於在嘗試檢索表之前測試鏈接服務器是否可用。

我沒有做的是有時他們做一個數據重建（它的部分特定的軟件），它會刪除所有表，包括一個參考。

所以我得到一個問題，即鏈接的服務器處於活動狀態，但無法找到我之後的表。

我怎樣才能讓這個查詢都測試鏈接的服務器，看看錶是否可用，如果都不是真的運行我的底部的'Catch'聲明。

我需要測試表是

[FIRST-W2K12-SQL.HQ.FIRST.CO.UK] .First_ICP.dbo.ic_brpolicy

BEGIN TRY 
exec sp_testlinkedserver [FIRST-W2K12-SQL.HQ.FIRST.CO.UK]; 
SELECT DISTINCT [Brand] FROM InfoCentre.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
UNION ALL 
SELECT DISTINCT [Brand] FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].First_ICP.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
END TRY 
BEGIN CATCH 
SELECT 'Error Retrieving Bracknell Brands' 
UNION 
SELECT DISTINCT [Brand] FROM InfoCentre.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
END CATCH 

我曾嘗試做這裏本

BEGIN TRY 
exec sp_testlinkedserver [FIRST-W2K12-SQL.HQ.FIRST.CO.UK]; 
IF NOT EXISTS (SELECT * FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].master.INFORMATION_SCHEMA.TABLES 
      WHERE TABLE_NAME = N'ic_brpolicy') 
BEGIN 
    RAISERROR('Table Doesnt Exist',16,1) 
END 
IF NOT EXISTS (SELECT * FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].master.INFORMATION_SCHEMA.TABLES 
      WHERE TABLE_NAME = N'icp_brpolicy') 
BEGIN 
    RAISERROR('Table Doesnt Exist',16,1) 
END 
SELECT DISTINCT [Brand] FROM InfoCentre.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
UNION ALL 
SELECT DISTINCT [Brand] FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].First_ICP.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
END TRY 
BEGIN CATCH 
SELECT 'Error Retrieving Bracknell Brands' 
UNION 
SELECT DISTINCT [Brand] FROM InfoCentre.dbo.ic_brpolicy 
WHERE Brand IS NOT NULL 
END CATCH 

Answer 1

的錯誤是：

首先你CHEC ķ表是否存在等在主數據庫：

IF NOT EXISTS (SELECT * FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].master.INFORMATION_SCHEMA.TABLES 
      WHERE TABLE_NAME = N'ic_brpolicy') 
BEGIN 
    RAISERROR('Table Doesnt Exist',16,1) 
END 

但表中主存在，所以你沒有錯誤，也不去catch - 阻塞

但你從master.dbo.ic_brpolicy做SELECT不但從First_ICP.dbo.ic_brpolicy 和該表不存在或您沒有權限。

你應該在First_ICP數據庫這樣的檢查所有腦幹：

IF NOT EXISTS (SELECT * FROM [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].First_ICP.INFORMATION_SCHEMA.TABLES 
      WHERE TABLE_NAME = N'ic_brpolicy') 
BEGIN 
    RAISERROR('Table Doesnt Exist',16,1) 
END 

要趕上編譯錯誤，您可以使用動態代碼：

begin try 
    exec('select top 1 * from InfoCentre.dbo.ic_brpolicy'); 

    exec('select top 1 * from [FIRST-W2K12-SQL.HQ.FIRST.CO.UK].First_ICP.dbo.ic_brpolicy'); 


begin catch 
    select error_message(); 
end catch