如何停止運行我的所有腳本的動態SQL

Question

我的MS SQL 2008 R2安裝程序上有一個存儲過程。該過程動態地創建一個表併爲其添加索引。下面顯示的是腳本的簡化版本，向您展示我正在做的事情。當我嘗試將索引信息添加到「@ SQL1」時，字符串長度變得太大，這就是爲什麼它被分成兩個字符串（@ SQL1和@ SQL2）的原因。我遇到的問題是，當表不存在時一切正常，但當表存在時，腳本的索引部分仍然運行。由於索引已經存在，因此失敗。解決這個問題的最佳方法是什麼？我不能將所有的腳本文本放入單個字符串中？

ALTER PROCEDURE [evt].[CreateReportingDestinationTable] 
(
    @Name nvarchar(50) 
) 
AS 
    SET NOCOUNT ON; 

    DECLARE @SQL1 nvarchar(max) 
    DECLARE @SQL2 nvarchar(max) 


    SET @SQL1 = "IF NOT EXISTS (SELECT * FROM sys.Tables WHERE name = '" + @Name + "' AND type in (N'U')) 
     CREATE TABLE [logs].[" + @Name + "](
      [MessageId] [uniqueidentifier] NOT NULL, 
      [TokenNumber] [nvarchar](50) NULL, 
     CONSTRAINT [PK_" + @Name + "] PRIMARY KEY CLUSTERED 
     (
      [MessageId] ASC 
     )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
     ) ON [PRIMARY]" 


    SET @SQL2 = "CREATE NONCLUSTERED INDEX [IX_" + @Name + "_TokenNumber_EventTime] ON [logs].[" + @Name + "] 
     (
      [TokenNumber] ASC 
     ) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
     " 

    EXEC(@SQL1 + @SQL2) 

Answer 1

包括索引的創建在同一IF分支爲該表的創建：

ALTER PROCEDURE [evt].[CreateReportingDestinationTable] 
(
    @Name nvarchar(50) 
) 
AS 
    SET NOCOUNT ON; 

    DECLARE @SQL1 nvarchar(max) 
    DECLARE @SQL2 nvarchar(max) 


    SET @SQL1 = "IF NOT EXISTS (SELECT * FROM sys.Tables WHERE name = '" + @Name + "' AND type in (N'U')) 
    BEGIN 
     CREATE TABLE [logs].[" + @Name + "](
      [MessageId] [uniqueidentifier] NOT NULL, 
      [TokenNumber] [nvarchar](50) NULL, 
     CONSTRAINT [PK_" + @Name + "] PRIMARY KEY CLUSTERED 
     (
      [MessageId] ASC 
     )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
     ) ON [PRIMARY]" 


    SET @SQL2 = "CREATE NONCLUSTERED INDEX [IX_" + @Name + "_TokenNumber_EventTime] ON [logs].[" + @Name + "] 
     (
      [TokenNumber] ASC 
     ) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
     " 

    SET SQL3 = ... 
    ... 

    EXEC(@SQL1 + @SQL2 + SQL3 + ... + ' END') 

Answer 2

你能不能檢查，如果存在索引，一樣的，你使用的表格做sys.indexes (Transact-SQL)

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SELECT * 
FROM sys.indexes 
WHERE name='YourIndexName' AND object_id = OBJECT_ID('YourTableName')