技術篇-將字段類型decimal批量處理從2位改為4位小數點sql,解決數據庫存儲精度

聲明：本人對一些版權並不深入了解，但是這個腳本是真的好，幫我解決了問題，特此收藏，並且注明了原文鏈接，如有侵權，請告知刪除。

/*
腳本作用:原來定義為decimal(18,2)類型的所有統一修改為decimal(19,4)。
作者：newsxy
來源：CSDN
原文：https://blog.csdn.net/newsxy/article/details/51280414
版權聲明：本文為博主原創文章，轉載請附上博文鏈接！
*/
-- 關閉約束
declare tb cursor for
SELECT sql='alter table ['+d.name+'] NOCHECK CONSTRAINT all'
FROM syscolumns a left join systypes b on a.xtype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype='U'and d.name<>'dtproperties'
where b.name in('decimal') GROUP BY d.name
declare @sql1 varchar(1000)
open tb
fetch next from tb into @sql1
while @@fetch_status = 0
begin
print @sql1
exec(@SQL1)
fetch next from tb into @sql1
end
close tb
deallocate tb

-- 修改字段數據類型
declare tb cursor for
SELECT sql='alter table ['+d.name+'] alter column ['+a.name+'] decimal(19,4)'
FROM syscolumns a left join systypes b on a.xtype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype='U'and d.name<>'dtproperties'
where b.name in('decimal') order by d.name,a.name
declare @sql2 varchar(1000)
open tb
fetch next from tb into @sql2
while @@fetch_status = 0
begin
print @sql2
exec(@SQL2)
fetch next from tb into @sql2
end
close tb
deallocate tb

-- 恢復約束
declare tb cursor for
SELECT sql='alter table ['+d.name+'] CHECK CONSTRAINT ALL'
FROM syscolumns a left join systypes b on a.xtype=b.xusertype
inner join sysobjects d on a.id=d.id and d.xtype='U'and d.name<>'dtproperties'
where b.name in('decimal') GROUP BY d.name
declare @sql3 varchar(1000)
open tb
fetch next from tb into @sql3
while @@fetch_status = 0
begin
print @sql3
exec(@SQL3)
fetch next from tb into @sql3
end
close tb
deallocate tb
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