SQL Server:遍历数据库中包含的所有表 [英] SQL Server : Iterate over all tables contained in a database
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问题描述
我知道使用游标是一个坏主意,但我只是不知道如何解决这个问题.我想遍历我的表列表(从information_schema.tables 中选择 select [table_name]),并在每个表上发出特定的
select
语句.
I know using cursors is a bad idea, but I just do not know how to solve this. I would like to iterate over my table list (select [table_name] from information_schema.tables
) and issue a specific select
statement on each of them.
这是我的尝试:
DECLARE c CURSOR READ_ONLY FAST_FORWARD FOR
SELECT [TABLE_NAME]
FROM INFORMATION_SCHEMA.TABLES
WHERE [TABLE_NAME] like 'TS%'
DECLARE @tableName char(7)
OPEN c
FETCH NEXT FROM c INTO @tableName
WHILE (@@FETCH_STATUS = 0)
BEGIN
-- which distinct ports has been used by inbound connections (listening sockets)?
SELECT [protocol], [src_ip], [dst_ip], [src_port], [dst_port], [path]
FROM (SELECT *, ROW_NUMBER() over (partition by [dst_port], [protocol] order by [id]) as RowNumber
FROM @tableName -- <<<<<< THIS IS WHERE IT FAILS
where [path] = 'RECEIVE') as a
WHERE a.RowNumber = 1 order by [dst_port];
FETCH NEXT FROM c into @tableName
END
CLOSE c
DEALLOCATE c
此操作失败
必须声明表变量"@tableName"
Must declare the table variable "@tableName"
在我的桌子上迭代"如"foreach"的更好方法是什么?预先感谢
What would be a better way to "iterate" like "foreach" over my tables? Thanks in advance
推荐答案
无光标的解决方案-
DECLARE @SQL NVARCHAR(MAX)
SELECT @SQL = STUFF((
SELECT '
SELECT [protocol], [src_ip], [dst_ip], [src_port], [dst_port], [path]
FROM (
SELECT *, rn = ROW_NUMBER() OVER (partition by dst_port, protocol ORDER BY id)
FROM [' + SCHEMA_NAME([schema_id]) + '].[' + name + ']
WHERE [path] = ''RECEIVE''
) a
WHERE a.rn = 1
ORDER BY dst_port;'
FROM sys.objects
WHERE [type] = 'U'
AND name LIKE 'TS%'
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '')
PRINT @SQL
EXEC sys.sp_executesql @SQL
输出-
SELECT [protocol], [src_ip], [dst_ip], [src_port], [dst_port], [path]
FROM (
SELECT *, rn = ROW_NUMBER() OVER (partition by dst_port, protocol ORDER BY id)
FROM [dbo].[table1]
WHERE [path] = 'RECEIVE'
) a
WHERE a.rn = 1
ORDER BY dst_port;
SELECT [protocol], [src_ip], [dst_ip], [src_port], [dst_port], [path]
FROM (
SELECT *, rn = ROW_NUMBER() OVER (partition by dst_port, protocol ORDER BY id)
FROM [dbo].[table2]
WHERE [path] = 'RECEIVE'
) a
WHERE a.rn = 1
ORDER BY dst_port;
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