...Oracle推荐使用 显式类型转换 ( Explicit data conversion )，使得任何类型都正确匹配，避免隐式转换(implicit data conversion): a.
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This function does not support CLOB data directly. However, CLOBs can be passed in as arguments through implicit data conversion.
此函数不直接支持CLOB数据。然而，CLOB可以作为参数通过隐式转换传入。
CLOB data types have an inherent code page equal to the database code page, so there is an implicit code page conversion of the reply to the SQL world during the serialization.
CLOB数据类型的代码页自然地等于数据库代码页，所以在串行化期间对SQL的回复有一个隐式的代码页转换。
Use it to enable implicit conversions between a user-defined type and another type, if the conversion is guaranteed not to cause a loss of data.
使用它可启用使用者定义型别和其他型别之间的隐含转换，但前提是要保证转换作业不会导致资料的遗失。
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