PL/SQL之存储过程和触发器实例

1、Oracle存储过程实例

/*不带任何参数存储过程(输出系统日期)*/
CREATE OR REPLACE PROCEDURE output_date IS
BEGIN
    DBMS_OUTPUT.PUT_LINE(SYSDATE);
END output_date;

/*带参数in和out的存储过程*/
CREATE OR REPLACE PROCEDURE get_username(v_id IN NUMBER,v_username OUT VARCHAR2) AS
BEGIN
  SELECT username INTO v_username FROM t_users WHERE id = v_id; --变量赋值
EXCEPTION
    WHEN NO_DATA_FOUND THEN
    RAISE_APPLICATION_ERROR(-20001,'记录不存在');
END get_username;

2、Oracle触发器实例

CREATE OR REPLACE TRIGGER trigger_name
AFTER INSERT OR UPDATE OR DELETE ON ITIL_USR_DEPARTMENT_DAG
FOR EACH ROW
BEGIN
     CASE
         WHEN INSERTING THEN
              INSERT INTO sys(id,ORG_NAME,ALIAS,PARENT_ORG_NAME) VALUSE(:new.id,:new.name,:new.alias,:new.p_name);
         WHEN UPDATING THEN
              UPDATE sys SET ORG_NAME=:new.name,ALIAS=:new.alias,PARENT_ORG_NAME=:new.p_name WHERE id=:new.id;
         WHEN DELETING THEN
              DELETE sys WHERE id=:old.id;
     END CASE;
END;