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.
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 #tmpselect '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 ' + @CollationNamefrom 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<>@CollationNameand c.name not in ( select cc.COLUMN_NAME from INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,INFORMATION_SCHEMA.KEY_COLUMN_USAGE ccwhere cc.TABLE_NAME = pk.TABLE_NAMEand 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=@sqlStrenddrop table #tmp;