Question

我有两个数据库，数据库A和数据库B，除了数据库B中某些表中的几个新列外，它们是相同的。

这两个数据库包含相同数量的表（1160个表）。我在数据库B中向大约40个表添加了列。这是与数据库A唯一不同的东西。

我清空了数据库B中的所有表，并希望将数据库A的每个表中的所有数据插入数据库B，只留下40个表的列数与源数据库A不同。

我需要一个脚本来遍历数据库A中的所有表，检查列是否相同，然后将其内容复制到数据库B中的那个表。如果列不相同，则应该留下错误表名。

Answer 1

这应该有效，假设您的所有表都是DBO。如果您有身份字段，请参阅我的评论

-- select only tables that have the same number of columns
declare tbls cursor for with tblsA as (
select t.name, count(*) as colCount
from DatabaseA.sys.tables t
    inner join DatabaseA.sys.columns c on c.object_id = t.object_id
group by t.name
)
, tblsB as (
select t.name, count(*) as colCount
from DatabaseB.sys.tables t
    inner join DatabaseB.sys.columns c on c.object_id = t.object_id
group by t.name
)
select tblsA.name as TableName
from tblsA 
   inner join tblsB on tblsB.name = tblsA.name and tblsB.colCount = tblsA.colCount


declare @tblName varchar(100)
declare @sqlText nvarchar(max)
open tbls
fetch next from tbls into @tblName
while @@FETCH_STATUS = 0
begin
    print 'Inserting into ' + @tblName 

    --un-comment if you don't have identity fields. 
    --you will need more code here if some table have identity field and some don't
    --set @sqlText = 'SET IDENTITY_INSERT DatabaseB..' + @tblName + ' ON'
    --exec(@sqlText)

    set @sqlText = 'insert into DatabaseB..' + @tblName + ' select * from DatabaseA..' + @tblName
    exec(@sqlText)

    fetch next from tbls into @tblName
end

close tbls
deallocate tbls

在两个相似的数据库之间复制数据

1 个答案: