自动清理 MSSQL Server Table Collation问题的解决方法
编程学习 2021-07-05 13:42www.dzhlxh.cn编程入门
Cannot resolve the collation conflict between "Latin1_General_CI_AS" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation
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：
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;