php 总结（10） PDO 连接数据库 预处理

Posted 2021-02-12 nice2018

 一.PDO 增删改查
        连接    $pdo= New PDO (‘mysql:host=localhost;dbname=houtaiablyycnbak‘,‘root‘,‘Aa122‘ );  
        接下来增删改查          

$sql = "select * from patient_13 where age between 20 and 30 && sex =‘女‘ order by age desc";
 $sq="insert into patient_13(age,name,sex) Values(33,‘张小姐酒‘,‘女‘)";
 $sql="delete from patient_13 where name=‘彭昌雲‘";
$sql="update patient_13 set name = ‘李值‘where name=‘李亚飞‘";

　　 执行语句
     $a=$pdo->exec($sql);
      查询语句
      

  $smt = $pdo -> query($sql);
  $arr = $smt -> fetchAll(pdo::FETCH_ASSOC);
  foreach ($arr as $arrs) {
   echo ‘<tr>‘;
           echo "<td>{$arrs[‘age‘]} </td>";
           echo "<td>{$arrs[‘name‘]}</td>";
           echo "<td>{$arrs[‘sex‘] }</td>";
           echo "<br>";
       echo "</tr>";
  }