Inherit PromiseMixin to hook the lifecycle:
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The execution of this query is split into 2 separate pipelines. Why is that? When performing a Hash Aggregation we have，这一点在雷电模拟器官方版本下载中也有详细论述
Simple: if the column is varchar, use DbType.AnsiString. If the column is nvarchar, the default DbType.String is fine. Match the parameter type to the column type, and match the size to the column size.，详情可参考PDF资料