C# 选择列为'的数据;s说明不为空,然后用说明替换列名
我有一张“PurchaseOrder”桌。当列的描述不为null时,我希望选择数据。然后用列的描述替换列的名称 表PurchaseOrderC# 选择列为'的数据;s说明不为空,然后用说明替换列名,c#,sql-server,tsql,C#,Sql Server,Tsql,我有一张“PurchaseOrder”桌。当列的描述不为null时,我希望选择数据。然后用列的描述替换列的名称 表PurchaseOrder ID | Product | Use | Price | Comment ----------------------------------------------------- 1 | Cellphone | true | 100 | 2 | Car | false | 10
ID | Product | Use | Price | Comment
-----------------------------------------------------
1 | Cellphone | true | 100 |
2 | Car | false | 10 |
3 | Table | true | 200 |
纵队
Name | Description
---------------------------
ID | Index
Produce | Name
Use |
Price | Sale
Comment |
选择结果将是
Index | Name | Sale
--------------------------------
1 | Cellphone | 100
2 | Car | 10
3 | Table | 200
现在,我只得到了一列描述
if object_id('tempdb..#dt') is not null drop table #dt
select
sc.column_id [Position],
sc.name [Column],
sc.max_length [Length],
sep.value [Description]
into #dt
from sys.tables st
inner join sys.columns sc on st.object_id = sc.object_id
left join sys.extended_properties sep on st.object_id = sep.major_id
and sc.column_id = sep.minor_id
and sep.name = 'MS_Description'
where st.name = 'PurchaseOrder' and sep.value is not null
如何生成最终的数据表?这看起来应该在应用程序而不是数据库级别处理。
说明
可能与其他列名匹配,列名中有不方便的字符。我倾向于编写一个存储过程,它返回两个记录集(description和data)或一个带有description的输出参数和一个带有data.ya的记录集,前提是按应用程序处理会更容易。我只是想知道它是否真的不能用存储过程来处理?如果我正确理解了您的问题,我在下面发布的代码应该会产生所需的结果。@JasonByrd,您可以解决它。
DECLARE
@TABLE_NAME NVARCHAR(50) = 'PurchaseOrderDetail',
@TABLE_SCHEMA Nvarchar(50) = 'Purchasing',
@COL_LIST NVARCHAR(MAX),
@SQL NVARCHAR(4000),
@COL NVARCHAR(500)
DECLARE c_cursor CURSOR FOR
SELECT sc.name + ' as ' + QUOTENAME(CAST(sep.value AS varchar)) AS Expr1
FROM sys.tables AS st INNER JOIN
sys.columns AS sc ON st.object_id = sc.object_id INNER JOIN
sys.extended_properties AS sep ON st.object_id = sep.major_id AND sc.column_id = sep.minor_id AND sep.name = 'MS_Description'
WHERE st.name = @TABLE_NAME AND sep.value IS NOT NULL
OPEN c_cursor;
FETCH NEXT
FROM c_cursor INTO @COL;
WHILE ( @@FETCH_STATUS = 0 )
BEGIN
SELECT @COL_LIST = COALESCE(@COL_LIST+',' ,'') + @COL
FETCH NEXT FROM c_cursor
INTO @col;
END CLOSE c_cursor;
DEALLOCATE c_cursor;
SET @SQL = ' SELECT ' + @COL_LIST +' FROM ' + QUOTENAME(@TABLE_SCHEMA)+'.'+QUOTENAME(@TABLE_NAME)
PRINT @SQL;
EXEC (@sql);