FENCED or NOT FENCED: This clause specifies whether the routine is considered "safe" to run in the database manager operating environment's process or address space.

FENCED或NOT FENCED：这个子句指定例程是否被认为可以在数据库管理器操作环境的进程或地址空间中“安全地”运行。

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REFERENCING clause: This clause can be used to define a trigger routine for a table object whose for EACH ROW actions can invoke the trigger routine.

REFERENCING clause：该子句为表对象定义触发器例程，这些表对象的FOR EACH ROW操作必须能够调用触发器例程。

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