MySQL数据库程序设计套题④【真题截图+原理解析】

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DELIMITER $$
CREATE TRIGGER custLevel BEFORE INSERT ON customer FOR EACH ROW
BEGIN
DECLARE creditlim int;
SET creditlim=_____;
IF creditlim > 50000 THEN
  SET NEW.customerLevel = '1st Level ';
_______(creditlim <= 50000 && creditlim >= 10000) THEN
  SET NEW.customerLevel = '2nd Level ';
ELSEIF creditlim < 10000 THEN
  SET NEW.customerLevel = '3rd Level';
END _______ ; 
END $$
DELIMITER ;

DELIMITER $$
CREATE _______ priceIncrementByCat(in p_catname CHAR(20), in p_increment decimal(10,2))
BEGIN
UPDATE product p,category c SET p.price=p.price*(1+p_increment)
WHERE p.cid=c.cid AND c.cname=________;
IF(ROW_COUNT()=0) THEN
    SELECT '类别名称不存在、或者该类别中无商品！' AS Result;
ELSE
    SELECT CONCAT('类别："',p_catname,'"中，有', ________,'件商品价格已被更新!') AS Result;
END IF;
END $$
DELIMITER ;

<?php
  $con=mysql_connect("localhost:3306","root","")
    or die("数据库服务器连接失败！<br>");
//**********found**********
  mysql_select_db("mysqltest", ________) or die( "数据库选择失败！<br>");
  if(isset($_GET['del']))
  {
    $sid=$_GET['del'];
    $delstudent='delete from student where sid='.$sid;
//**********found**********
    _________($delstudent,$con);
  }
  $sql_student="SELECT sid,sname,score,deptname FROM student s,dept d where s.deptno=d.deptno";
  $result_student=mysql_query($sql_student,$con);
?>
<!-- **********found********** -->
<_______ border='1px'>
  <tr>
    <td>结果序号</td>
    <td>学号</td>
    <td>姓名</td>
    <td>成绩</td>
    <td>系别名称</td>
    <td>操作</td>
  </tr>
<?php
//**********found**********
  $counter=_______;
  while($rows_student=mysql_fetch_array($result_student)){
    $counter++;
?>
  <tr> 
    <td><?php echo $counter; ?></td>
    <td><?php echo $rows_student[0];?></td>
    <td><?php echo $rows_student[1];?></td>
    <td><?php echo $rows_student[2];?></td>
    <td><?php echo $rows_student[3];?></td>
    <td><a href='sj3.php?del=<?php echo $rows_student[0];?>' onclick='return confirm("确定要删除吗")'>删除</a></td>
  </tr>
<?php
  }
  mysql_close($con);
?>
</table>
<!-- **********found********** -->
<br/>所有学生的信息(共有 <?php echo ____ ?> 人)：<br/>

我们多看一些语法就知道PHP的语法知识套路了，你并且也可以熟悉PHP在操作MySQL的时候的一些套路了。