examlog

这是Getting Started With Sqlite 的相关示例代码和帮助文件

-- *******************************************************************
--  examLog: Script for creating log table and related triggers
--   Usage:
--       $ sqlite3 examdatabase < examLOG
--
--   
-- *******************************************************************
-- *******************************************************************
CREATE TABLE examlog (lkey INTEGER PRIMARY KEY, 
                  ekey INTEGER,
                  ekeyOLD INTEGER,
                  fnNEW   VARCHAR(15),
                  fnOLD   VARCHAR(15),
                  lnNEW   VARCHAR(30),
                  lnOLD   VARCHAR(30),
                  examNEW INTEGER,
                  examOLD INTEGER,
                  scoreNEW DOUBLE,
                  scoreOLD DOUBLE,
                  sqlAction VARCHAR(15),
                  examtimeEnter    DATE,
                  examtimeUpdate   DATE,
                  timeEnter        DATE);

--  Create an update trigger
CREATE TRIGGER update_examlog AFTER UPDATE  ON exam
BEGIN     

  INSERT INTO examlog  (ekey,ekeyOLD,fnOLD,fnNEW,lnOLD,
                        lnNEW,examOLD,examNEW,scoreOLD,
                        scoreNEW,sqlAction,examtimeEnter,
                        examtimeUpdate,timeEnter) 

          values (new.ekey,old.ekey,old.fn,new.fn,old.ln,
                  new.ln,old.exam, new.exam,old.score,
                  new.score, 'UPDATE',old.timeEnter,
                  DATETIME('NOW'),DATETIME('NOW') );     

END;
-- 
--  Also create an insert trigger
--    NOTE  AFTER keyword ------v
CREATE TRIGGER insert_examlog AFTER INSERT ON exam  
BEGIN     
INSERT INTO examlog  (ekey,fnNEW,lnNEW,examNEW,scoreNEW,
                      sqlAction,examtimeEnter,timeEnter) 

          values (new.ekey,new.fn,new.ln,new.exam,new.score,
                  'INSERT',new.timeEnter,DATETIME('NOW') );     

END;

--  Also create a DELETE trigger
CREATE TRIGGER delete_examlog DELETE ON exam
BEGIN     

INSERT INTO examlog  (ekey,fnOLD,lnNEW,examOLD,scoreOLD,
                      sqlAction,timeEnter) 

          values (old.ekey,old.fn,old.ln,old.exam,old.score,
                  'DELETE',DATETIME('NOW') );     

END;
-- *******************************************************************
-- *******************************************************************