Question

查询应返回table ='alrt'的结果但它在转义报价时有错误

declare @dbname nvarchar(max)  
declare @query nvarchar(max)  
set @dbname = 'alrt'  
set @query ='SELECT OBJECT_NAME(object_id) AS DatabaseName, last_user_update,convert(nvarchar(max),last_user_seek),last_user_scan,last_user_lookup,last_system_update FROM sys.dm_db_index_usage_stats WHERE database_id = DB_ID ('+'''Frontoffrob'''+') AND OBJECT_ID=OBJECT_ID('+@dbname+')'
exec (@query)

错误结果

Msg 207, Level 16, State 1, Line 1 Invalid column name 'alrt'.

。
。
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以下查询正在工作中 SELECT OBJECT_NAME(object_id) AS DatabaseName,convert(nvarchar(max),last_user_scan)as SCAN FROM sys.dm_db_index_usage_stats WHERE database_id = DB_ID ('Frontoffrob') AND OBJECT_ID=OBJECT_ID ('ALRT')

输出：

+ - 数据库名 - + ---- ---- Last_user_SCAN +
| __ ALRT _ __ _ __ _ _ | _ 2013年8月30日1:47 PM_ |

Answer 1

在您的WHERE条款中使用此：

'SELECT ... AND OBJECT_ID=OBJECT_ID('''+@dbname+''')'

实际上，您的查询应如下所示：

set @query =
'SELECT 
    OBJECT_NAME(object_id) AS DatabaseName, 
    last_user_update,
    convert(nvarchar(max),last_user_seek),
    last_user_scan,
    last_user_lookup,
    last_system_update 
FROM sys.dm_db_index_usage_stats 
WHERE database_id = DB_ID (''Frontoffrob'') 
AND 
OBJECT_ID=OBJECT_ID(''' + @dbname+''')'

需要有关为动态sql转义字符的帮助

1 个答案: