在一个团队项目中,没有约定好Collation, 在 MS SQL Server中编程就会遇到这样的问题:
Cannot resolve the collation conflict between "Latin1_General_CI_AS" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation.
因为编码问题,不同编码的字符串并不能直接进行比较,这种有两个解决方法,1是在 query中 指定 用某一个collation进行比较, 另外一个就是修改column的 collation type 来避免这种错误。
第二种方法,一个一个column改起来很累,写了个script,除了 被当作 constraints比如 primary key, foreign key之外的 varchar, char,nvarchar 都可以统一修改成一个collation…
完整sql代码:
复制代码 代码如下:
declare @CollationName varchar(500);
set @CollationName = "SQL_Latin1_General_CP1_CI_AS"
create table #tmp (sqlStr varchar(max));
insert into #tmp
select "alter table [" + o.name + "] alter column [" + c.name + "]" +
(case c.system_type_id when 167 then " varchar(" when 175 then " char(" else " nvarchar(" end)
+ convert(varchar,c.max_length) + ") collate " + @CollationName
from sys.columns c,
sys.objects o
where c.object_id=o.object_id and o.type="U" and c.system_type_id in (167,175,231) and collation_name<>@CollationName
and c.name not in (
select cc.COLUMN_NAME
from
INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE cc
where
cc.TABLE_NAME = pk.TABLE_NAME
and cc.CONSTRAINT_NAME = pk.CONSTRAINT_NAME)
while (exists (select * from #tmp))
begin
declare @sqlStr varchar(max);
select @sqlStr=(select top 1 sqlstr from #tmp);
exec(@sqlStr)
delete from #tmp where sqlStr=@sqlStr
end
drop table #tmp;