CREATE OR REPLACE FUNCTION fn_ipaddr_to_PRovince (p_ipaddr NUMBER)
RETURN VARCHAR2
IS
v_ret VARCHAR2 (100) := '';
BEGIN
BEGIN
SELECT province
INTO v_ret
FROM ipdb
WHERE start_ip <= p_ipaddr AND end_ip >= p_ipaddr AND ROWNUM = 1;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
v_ret := '';
END;
RETURN v_ret;
EXCEPTION
WHEN OTHERS
THEN
RAISE;
END fn_ipaddr_to_province;
/ 根據省份確定服務器地址，domainname 中有35條數據?！ 〗鉀Q方法 方法一：BEGIN
SELECT serverip
INTO v_serverip
FROM domainname
WHERE province = fn_ipaddr_to_province (p_ip) AND ROWNUM = 1;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
v_serverip := 'mp3.u-vv.com';
END;
... 這種方法 CPU 使用率 90% 以上 方法二：v_province := fn_ipaddr_to_province (p_ip);
BEGIN
SELECT serverip
INTO v_serverip
FROM domainname
WHERE province = v_province AND ROWNUM = 1;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
v_serverip := 'default domain';
END; 這種方法 CPU 使用率 40% 左右。 新聞熱點
疑難解答
