不幸的是,封装主体OWBSYS.wb_rt_constants
被封装,所以我们看不到它的实现的源代码。
总之,函数to_string
具有以下特征:
function to_string(p_constant in number) return varchar2;
它是在一些OWBSYS观点使用的,如ALL_RT_AUDIT_EXECUTIONS
,似乎一个数字ID转换成一个描述字符串,例如
col execution_audit_status format a20
select distinct e.audit_status,
wb_rt_constants.to_string(e.audit_status) as execution_audit_status
from wb_rt_audit_executions e;
AUDIT_STATUS EXECUTION_AUDIT_STAT
------------ --------------------
16002 BUSY
16004 COMPLETE
这些数字似乎的同一个包的这些函数的输出相匹配:
select wb_rt_constants.EXECUTION_STATUS_INACTIVE,
wb_rt_constants.EXECUTION_STATUS_BUSY,
wb_rt_constants.EXECUTION_STATUS_READY,
wb_rt_constants.EXECUTION_STATUS_COMPLETE
from dual;
EXECUTION_STATUS_INACTIVE EXECUTION_STATUS_BUSY EXECUTION_STATUS_READY EXECUTION_STATUS_COMPLETE
------------------------- --------------------- ---------------------- -------------------------
16001 16002 16003 16004