按照前面描述的那样在元数据对象中指定筛选条件，可以限制返回到 SDO 的数据量。
You can limit the amount of data returned to the SDO by specifying filters in the meta data objects as described earlier.
在这两种方法中，不赞成使用参数结构，因为它强加了限制：指定在内存中，每个参数必须位于 param_struct 中的特定偏移量处。
Of these, param structure is deprecated as it imposes restrictions by specifying that each and every parameter has to be at a particular offset within param_struct in memory.
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