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SDO_Model_Type::getBaseType — Get the base type for this type
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
Get the base type for this type.
Returns the SDO_Model_Type for the base type if this type inherits from
another, otherwise returns NULL. An example of when base types occur
is when a type defined in XML schema inherits from another type by using
<extension base="...">
None.
Returns the SDO_Model_Type for the base type if this type inherits from
another, otherwise returns NULL.