我在旧的mysql中创建了一个函数,现在想将它转移到PDO,但是它无法正常工作。这是我的新代码:
global $host, $dbname, $user, $pass;
$DBH = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
$STH = $DBH->query("SELECT SUM(score), SUM(score_from) FROM school_test_report, school_students
WHERE (school_test_report.student_id = school_students.student_id
and school_test_report.class=school_students.class)
and school_test_report.student_id = '$student_id' and school_test_report.subject = '$subject'
and school_test_report.test_date >= '$thisarch'
")
$STH->setFetchMode(PDO::FETCH_ASSOC);
return $STH;
并输出:
$student_id = test_score_month($name, 'English');
echo $student_id['score'].'/'.$student_id['score_from'];
以下是旧代码:
$result1 = mysql_query("SELECT SUM(score), SUM(score_from) FROM school_test_report, school_students
WHERE (school_test_report.student_id = school_students.student_id
and school_test_report.class=school_students.class)
and school_test_report.student_id = '$student_id' and school_test_report.subject = '$subject'
and school_test_report.test_date >= '$thisarch'
")
or die(mysql_error());
$row = mysql_fetch_assoc($result1);
return $row;
并输出:
$student_id = test_score_month($name, 'English');
echo $student_id['score'].'/'.$student_id['score_from'];
答案 0 :(得分:1)
Heres是一个示例,将您的所有函数包装在与模型类中的用户相关的查询中,然后调用每个方法返回结果ect,看看函数/方法如何使用占位符:student_id
然后bindParam的占位符的价值,这只是一个例子,但会帮助你更多地了解abit。
<?php
class user_model{
private $db;
function __construct($host,$dbname,$user,$pass){
$this->dbhost = $host;
$this->dbname = $dbname;
$this->dbuser = $user;
$this->dbpass = $pass;
}
private function connect(){
if (!$this->db instanceof PDO){
$this->db = new PDO('mysql:dbname='.$this->dbname.';host='.$this->dbhost, $this->dbuser, $this->dbpass);
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
}
function user_test_score($student_id,$subject,$thisarch){
$this->connect();
$sql = "SELECT SUM(score) as score, SUM(score_from) FROM school_test_report, school_students
WHERE (school_test_report.student_id = school_students.student_id
AND school_test_report.class=school_students.class)
AND school_test_report.student_id = :student_id and school_test_report.subject = :subject
AND school_test_report.test_date >= :thisarch";
$statement = $this->db->prepare($sql);
$statement->bindParam(':student_id', $student_id, PDO::PARAM_INT);
$statement->bindParam(':subject', $subject, PDO::PARAM_STR);
$statement->bindParam(':thisarch', $thisarch, PDO::PARAM_STR);
$statement->execute();
return $statement->fetchAll(PDO::FETCH_ASSOC);
}
}
$usermodel = new user_model('localhost','YOURDB','username','password');
$student_id = $usermodel->user_test_score($name,'English',your_test_date_format);
print_r($student_id);
?>