MYSQL="/usr/bin/mysql"
USER="root"
PASSWD="abc123"
DATDABASE="test"
LTABLE="laomeng"
BAKTABL="laomengbak"

#判斷備份表是否存在如果不存在，建立新表

if [ ! -e "/var/lib/mysql/test/laomengbak.frm" ]; then
$MYSQL -u$USER -p$PASSWD --default-character-set=utf8 <<EOF
use $DATDABASE;
CREATE TABLE $BAKTABL(id int, name varchar(25
 
),score int,sex int,createdate datetime);
SELECT * FROM laomengbak;
EOF
   #if [ $? = "0" ]; then
     # echo "create laomengbak talbe success!"
     #else
      #  echo "No table create"
   # fi
   #else
    #echo "The laomegbak table arealy exists & continue"
fi

#將查詢結果插入備份表中
#刪除三天之前的資料
$MYSQL -u$USER
 
 -p$PASSWD --default-character-set=utf8 <<EOF
use $DATDABASE;
insert into laomengbak(id,name,score,sex,createdate ) select id,name,score,sex,now() as date from laomeng;
delete from laomengbak  where datediff(now(),createdate)>3;
EOF
#if [ $? = "0" ]; then
  # echo "execute success"
  #else
   #echo "execute failed"
 
 
#fi        

#delete from laomengbak  where datediff(now(),createdate)>3;  #刪除三天之前的資料
#delete from laomengbak where date_format(createdate,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m') ;  #刪除除上個月的資料