遍历结果集

WHILE loop,你错过了 Fetch Next out of memory exception

WHILE @@FETCH_STATUS = 0
        BEGIN

            SET @SQL = N'ALTER TABLE ' + Quotename(@T) +
                'ADD COL1 NVARCHAR(50),
                    COL2 NVARCHAR(50),
                    COL3 NVARCHAR(10),
                    COL4 NVARCHAR(6)'
            EXEC (@SQL)

            --Need this next line to move the cursor to the next record
            --Without this you create an infinite loop
            FETCH NEXT FROM TABLE_CURSOR INTO @T


        END 

我会这样做的。

DECLARE @SQL varchar(max);
SET @SQL = '';
SELECT @SQL = @SQL + 'ALTER TABLE '+ CAST(QUOTENAME(s.name) as Varchar(10))+'.'+Cast(QUOTENAME(t.name) as VARCHAR(50)) + ' ADD COL1 NVARCHAR(50), COL2 NVARCHAR(50),COL3 NVARCHAR(10), COL4 NVARCHAR(6); '
FROM sys.tables t
Join sys.all_columns ac on t.object_id = ac.object_id --Remove this join if you arent searching for tables with specific name
JOIN sys.schemas s on t.schema_id = t.schema_id
Where t.type = 'U' --tables 
      and s.schema_id = 1 --Your shema ID 
    --and ac.Name like '%Tables with this column%'

--Exec(@SQL)
PRINT @SQL