需求：如果ip表裡存在客戶端訪問的ip，則不讓他訪問。
操作：第一步，獲取客戶端ip
通過已下方法：
}第二步：把獲取的ip段還成數字（把每一段ip都*255，一段三個，二段兩個，三段乙個，四段無，然後把每段得出的值相加，變成乙個數後比較），把已存庫里ip也同樣方 法換成數字，然後兩個數字進行對比。
下面sql是模仿獲取10.12.6.89來換成數字，通過 view_ca_ip_restrict 檢視去ca_ip_restrict表中查詢，
select * from view_ca_ip_restrict t where to_number(substr('10.12.6.89', 0, instr('10.12.6.89', '.') - 1) * 255 * 255 * 255 + to_number(substr(substr('10.12.6.89', instr('10.12.6.89', '.', 1, 1) + 1), 0, instr(substr('10.12.6.89', instr('10.12.6.89', '.', 1, 1) + 1), '.') - 1)) * 255 * 255 + to_number(substr(substr('10.12.6.89', instr('10.12.6.89', '.', 1, 2) + 1), 0, instr(substr('10.12.6.89', instr('10.12.6.89', '.', 1, 2) + 1), '.') - 1)) * 255 + to_number(substr('10.12.6.89', instr('10.12.6.89', '.', 1, 3) + 1))) between t.startip and t.endip
檢視**：
create or replace view view_ca_ip_restrict as
select to_number(substr(start_ip, 0, instr(start_ip, '.') - 1)) * 255 * 255 * 255 +
to_number(substr(substr(start_ip,
instr(start_ip, '.', 1, 1) + 1),
0,instr(substr(start_ip,
instr(start_ip, '.', 1, 1) + 1),
'.') - 1)) * 255 * 255 +
to_number(substr(substr(start_ip,
instr(start_ip, '.', 1, 2) + 1),
0,instr(substr(start_ip,
instr(start_ip, '.', 1, 2) + 1),
'.') - 1)) * 255 +
to_number(substr(start_ip,
instr(start_ip, '.', 1, 3) + 1)) as startip,
to_number(substr(end_ip, 0, instr(end_ip, '.') - 1)) * 255 * 255 * 255 +
to_number(substr(substr(end_ip,
instr(end_ip, '.', 1, 1) + 1),
0,instr(substr(end_ip,
instr(end_ip, '.', 1, 1) + 1),
'.') - 1)) * 255 * 255 +
to_number(substr(substr(end_ip,
instr(end_ip, '.', 1, 2) + 1),
0,instr(substr(end_ip,
instr(end_ip, '.', 1, 2) + 1),
'.') - 1)) * 255 +
to_number(substr(end_ip, instr(end_ip, '.', 1, 3) + 1)) as endip
from ca_ip_restrict
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