Question

我的动态变量分析问题不正确，我不知道解决方法。

以下是一个例子：

DECLARE @tableName varchar(20),
    @columnName varchar(20),
    @prompt varchar(20)

DECLARE @dynSQL varchar(500)


set @tableName = '[A1-ExciseESN]'
set @columnName = '[Anode Excise ESN (A1)]'

@dynSQL = 'INSERT INTO ' + @tableName +'
([trav num], '+@columnName+')
Select [trav num], '+@columnName+'
FROM [temprmi$] t1
PIVOT(min([Lvl1 Trace Data])
FOR [Prompt Text] IN ('+@columnName+'
   )
   ) AS PVTTable
     where '+@columnName+' is not null and [trav num] not in (select [trav num] from '+@tableName+')'


print @dynSQL

以下是print @dynSQL

的输出

INSERT INTO [A1-ExciseESN]
([trav num], [Anode Excise ESN (A) 
Select [trav num], [Anode Excise ESN (A
FROM [temprmi$] t1
PIVOT(min([Lvl1 Trace Data])
FOR [Prompt Text] IN ([Anode Excise ESN (A
   )
   ) AS PVTTable
     where [Anode Excise ESN (A is not null and [trav num] not in (select [trav num] from [A1-ExciseESN])

我尝试了几种方法，但似乎无法使其发挥作用。在此先感谢您的帮助！

Answer 1

您已定义：

@columnName varchar(20),

但是你要分配：

set @columnName = '[Anode Excise ESN (A1)]'

columnname必须至少为varchar（23）。您使用的列名称长度为23个字符。

Answer 2

为idetifiers使用正确的类型SYSNAME，为查询{/ li>使用NVARCHAR(MAX)
使用REPLACE而不是连接它将更容易调试，尤其是当您需要字符串文字时
考虑使用QUOTENAME功能

代码：

DECLARE 
    @tableName  SYSNAME,
    @columnName SYSNAME,
    @prompt     VARCHAR(20),
    @dynSQL     NVARCHAR(MAX);

SET @tableName  = QUOTENAME('A1-ExciseESN');
SET @columnName = QUOTENAME('Anode Excise ESN (A1)');

SET @dynSQL = 
N'INSERT INTO  <tableName> 
 ([trav num], <columnName>)
Select [trav num], <columnName>
FROM [temprmi$] t1
PIVOT(min([Lvl1 Trace Data])
FOR [Prompt Text] IN (<columnName>)
   ) AS PVTTable
     where <columnName> is not null 
        and [trav num] not in (select [trav num] from <tableName> )'

SET @dynSQL = REPLACE(REPLACE(@dynSQL, '<tableName>', @tableName),
               '<columnName>', @columnName);

PRINT @dynSQL;

的 LiveDemo

输出：

INSERT INTO [A1-ExciseESN] ([trav num], [Anode Excise ESN (A1)]) Select [trav num], [Anode Excise ESN (A1)] FROM [temprmi$] t1 PIVOT(min([Lvl1 Trace Data]) FOR [Prompt Text] IN ([Anode Excise ESN (A1)]) ) AS PVTTable where [Anode Excise ESN (A1)] is not null and [trav num] not in (select [trav num] from [A1-ExciseESN] )

动态MS SQL变量分析错误

2 个答案: