PLSQL 位掩码值

Question

我是这种情况，无法验证打印权限位。不幸的是，我不能有一个点亮的位掩码。你能给我一些建议吗？

SELECT 
  DECODE(BITAND(00000000100000100000000000000001, 1), 1, '1', '0') AS READ,
  DECODE(BITAND(00000000100000100000000000000001, 131072), 131072, '1', '0') AS COPY,
  DECODE(BITAND(00000000100000100000000000000001, 8388608), 8388608, '1', '0') AS PRINT
  FROM 
DUAL

结果如下

R C P
- - -
1 1 0

你能给我一些建议吗？

Answer 1

BIT_AND函数的两个参数都是数字，没有位向量。

例如：

select bin_to_num(0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1) from dual;

OUTPUT>
8519681

with 
datum as
(select bin_to_num(0,0,0,0,0,0,0,0,1/*print*/,0,0,0,0,0,1/*copy*/,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1/*read*/) val from dual)
select 
  decode(bitand(val, 1), 1, '1', '0') as read,
  decode(bitand(val, 131072), 131072, '1', '0') as copy,
  decode(bitand(val, 8388608), 8388608, '1', '0') as print
from  datum

PLSQL 位掩码值

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oracle

bitmask