更新时间:2023-01-30 13:54:58
由于找不到合适的方法,我编写了脚本来完成此任务,并在此与需要它的人分享。该脚本贯穿所有用户表并收集列。如果列类型是任何char类型,则它将尝试将其转换为给定的排序规则。
As I did not find a proper way I wrote a script to do it and I'm sharing it here for those who need it. The script runs through all user tables and collects the columns. If the column type is any char type then it tries to convert it to the given collation.
列必须是索引且不受约束,这样才能起作用。
Columns has to be index and constraint free for this to work.
如果有人对此还有更好的解决方案,请发布!
DECLARE @collate nvarchar(100);
DECLARE @table nvarchar(255);
DECLARE @column_name nvarchar(255);
DECLARE @column_id int;
DECLARE @data_type nvarchar(255);
DECLARE @max_length int;
DECLARE @row_id int;
DECLARE @sql nvarchar(max);
DECLARE @sql_column nvarchar(max);
SET @collate = 'Latin1_General_CI_AS';
DECLARE local_table_cursor CURSOR FOR
SELECT [name]
FROM sysobjects
WHERE OBJECTPROPERTY(id, N'IsUserTable') = 1
OPEN local_table_cursor
FETCH NEXT FROM local_table_cursor
INTO @table
WHILE @@FETCH_STATUS = 0
BEGIN
DECLARE local_change_cursor CURSOR FOR
SELECT ROW_NUMBER() OVER (ORDER BY c.column_id) AS row_id
, c.name column_name
, t.Name data_type
, c.max_length
, c.column_id
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id
LEFT OUTER JOIN sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
LEFT OUTER JOIN sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
WHERE c.object_id = OBJECT_ID(@table)
ORDER BY c.column_id
OPEN local_change_cursor
FETCH NEXT FROM local_change_cursor
INTO @row_id, @column_name, @data_type, @max_length, @column_id
WHILE @@FETCH_STATUS = 0
BEGIN
IF (@max_length = -1) OR (@max_length > 4000) SET @max_length = 4000;
IF (@data_type LIKE '%char%')
BEGIN TRY
SET @sql = 'ALTER TABLE ' + @table + ' ALTER COLUMN ' + @column_name + ' ' + @data_type + '(' + CAST(@max_length AS nvarchar(100)) + ') COLLATE ' + @collate
PRINT @sql
EXEC sp_executesql @sql
END TRY
BEGIN CATCH
PRINT 'ERROR: Some index or constraint rely on the column' + @column_name + '. No conversion possible.'
PRINT @sql
END CATCH
FETCH NEXT FROM local_change_cursor
INTO @row_id, @column_name, @data_type, @max_length, @column_id
END
CLOSE local_change_cursor
DEALLOCATE local_change_cursor
FETCH NEXT FROM local_table_cursor
INTO @table
END
CLOSE local_table_cursor
DEALLOCATE local_table_cursor
GO