如何停止动态 SQL 运行我的所有脚本答案

【问题标题】：How to stop Dynamic SQL running all of my script如何停止动态 SQL 运行我的所有脚本
【发布时间】：2012-09-07 09:11:38
【问题描述】：

我的 MS SQL 2008 R2 设置中有一个存储过程。该过程动态地创建一个表并向其添加索引。下面显示的是脚本的精简版，向您展示我在做什么。当我尝试将索引信息添加到“@SQL1”时，字符串长度变得太大，这就是为什么它被分成两个字符串（@SQL1 和@SQL2）。我遇到的问题是，当表不存在时一切都很好，但是当表确实存在时，脚本的索引部分仍在运行。这会失败，因为索引已经存在。记住我不能将所有脚本文本放入单个字符串中，解决此问题的最佳方法是什么？

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)

【问题讨论】：

标签： sql-server-2008 stored-procedures dynamic-sql

【解决方案1】：

你可以不检查索引是否存在，就像你使用sys.indexes (Transact-SQL)检查表一样

类似

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

【讨论】：

我可以这样做，但我希望采用不同的方法，因为会有很多索引，因此维护起来可能会很混乱

【解决方案2】：

将索引的创建包含在与表的创建相同的 IF 分支中：

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'))
    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')

【讨论】：

谢谢。这正是我所追求的。这是一种享受。