多次插入后使用触发器更新日志表

Question

我有以下触发器:

ALTER TRIGGER [Staging].[tr_UriData_ForInsert]
ON [Staging].[UriData]
FOR INSERT 
AS
BEGIN
    DECLARE @_Serial NVARCHAR(50)
    DECLARE @_Count AS INT

    IF @@ROWCOUNT = 0
        RETURN

    SET NOCOUNT ON;

    IF EXISTS(SELECT * FROM inserted)
    BEGIN
        SELECT @_Count = COUNT(Id) FROM inserted
        SELECT @_Serial = SerialNumber FROM inserted

        INSERT INTO [Staging].[DataLog]
        VALUES (CURRENT_TIMESTAMP, @_Serial + ': Data Insert --> Rows inserted: ' + @_Count, 'New data has been received')
    END 
END

该表一次接收多行.我希望能够在日志表中添加一行告诉我插入已经发生.

插入一行时效果很好,但是有多行,触发器不会触发.我在这里阅读了其他项目,很明显你不应该使用ROW_NUMBER().

总结:我想在另一个名为UriData的表中发生多行插入时更新我的​​日志表.

使用以下内容从C#插入数据:

using (var sqlBulk = new SqlBulkCopy(conn, SqlBulkCopyOptions.Default, transaction))
            {
                sqlBulk.DestinationTableName = tableName;

                try
                {
                    sqlBulk.WriteToServer(dt);
                }
                catch(SqlException sqlEx)
                {
                    transaction.Rollback();
                    var msg = sqlEx.Message;
                    return false;

                }
                finally {
                    transaction.Commit();
                    conn.Close();                     
                }
            }

我不想知道插入了什么,但是当它发生时,我可以运行一组SPROCS来清理和转动数据.

TIA

Answer 1

问题是您的触发器假定只更新一行.标量变量只能有1个值.因此,例如,语句SELECT @_Serial = SerialNumber FROM inserted将@_Serial使用从对象返回的最后一个值进行设置inserted.

将数据视为数据集.这是未经测试的,但是,我怀疑这会给你你想要的结果:

ALTER TRIGGER [Staging].[tr_UriData_ForInsert]
ON [Staging].[UriData]
FOR INSERT 
AS
BEGIN

    --No need for a ROWCOUNT. If there are no rows, then nothing was inserted, and this trigger won't happen.

    INSERT INTO [Staging].[DataLog] ({COLUMNS LIST})
    SELECT CURRENT_TIMESTAMP,
           SerialNumber + ': Data Insert --> Rows inserted: ' +
           CONVERT(varchar(10),COUNT(SerialNumber) OVER (PARTITION BY SerialNumber)), --COUNT returns an INT, so this statement would have failed with a conversion error too
           'New data has been received'
    FROM inserted;
END

请注意我在braces({})中的注释或部分.

编辑:肖恩,他已经删除了他的答案,使用GROUP BY.我复制了你的确切方法,但是,很GROUP BY可能是你想要的条款,而不是OVER.