在Oracle中,userenv函數(shù)是用于獲取當(dāng)前會話的信息的函數(shù),比如用戶名、IP地址、客戶端操作系統(tǒng)等。調(diào)試userenv函數(shù)的方法有以下幾種:
SELECT sys_context('userenv', 'SESSION_USER') AS username,
sys_context('userenv', 'IP_ADDRESS') AS ip_address,
sys_context('userenv', 'OS_USER') AS os_user
FROM dual;
DECLARE
l_username VARCHAR2(100);
l_ip_address VARCHAR2(100);
l_os_user VARCHAR2(100);
BEGIN
l_username := sys_context('userenv', 'SESSION_USER');
l_ip_address := sys_context('userenv', 'IP_ADDRESS');
l_os_user := sys_context('userenv', 'OS_USER');
DBMS_OUTPUT.PUT_LINE('Username: ' || l_username);
DBMS_OUTPUT.PUT_LINE('IP Address: ' || l_ip_address);
DBMS_OUTPUT.PUT_LINE('OS User: ' || l_os_user);
END;
CREATE OR REPLACE TRIGGER trg_user
BEFORE INSERT ON table_name
FOR EACH ROW
BEGIN
DBMS_OUTPUT.PUT_LINE('Current user: ' || sys_context('userenv', 'SESSION_USER'));
END;
通過以上幾種方法,可以方便地調(diào)試userenv函數(shù),了解當(dāng)前會話的信息。