用php处理数据库表中的值

我目前在MySQL数据库中有5个表。其中一些共享外键，并且相互依存。我根据他们的专业显示课程。每节课都在秋季、春季或全年上课。在我的数据库中有一个名为Serm的表，它有一个

id

，

year

，和

Serm

字段。特别是

字段是一个
tinyint
，它有三个值
0
，
1
，
2
。这表示秋季、春季或全年。当我显示查询而不是让它显示
0
或
1
或
2
时，我可以让它显示
fall
、
spring
等吗？额外：如何在每个循环的末尾添加空间，使数据看起来不聚集

键

0 Fall
1 Spring
2 All-year

Computer Programming I
CPSC1400
Introduction to disciplined, object-oriented program development.
4 hrs.
0
2013

Computer Programming I
CPSC1400
Introduction to disciplined, object-oriented program development.
4 hrs.
Fall
2013

PHP

<?


try {

    $pdo = new PDO ("mysql:host=$hostname;dbname=$dbname","$username","$pw");
    } catch (PDOException $e) {
    echo "Failed to get DB handle: " . $e->getMessage() . "\n";
    exit;
  }
      $query = $pdo->prepare("SELECT course.name, course.code, course.description, course.hours, semester.semester, semester.year
                            FROM course
                            LEFT JOIN major_course_xref ON course.id = major_course_xref.course_id
                            LEFT JOIN major ON major.id = major_course_xref.major_id
                            LEFT JOIN course_semester_xref ON course.id = course_semester_xref.course_id
                            LEFT JOIN semester ON course_semester_xref.semester_id = semester.id");
      $query->execute();

     if ($query->execute()){

      while ($row = $query->fetch(PDO::FETCH_ASSOC)){       
        print $row['name'] . "<br>";
        print $row['code'] . "<br>";
        print $row['description'] . "<br>";
        print $row['hours'] . " hrs.<br>";
        print $row['semester'] . "<br>";
        print $row['year'] . "<br>";
    }
    }
else
    echo 'Could not fetch results.';

      unset($pdo); 
      unset($query);

?>

渴望显示

0 Fall
1 Spring
2 All-year

Computer Programming I
CPSC1400
Introduction to disciplined, object-oriented program development.
4 hrs.
0
2013

Computer Programming I
CPSC1400
Introduction to disciplined, object-oriented program development.
4 hrs.
Fall
2013

将查询中的
学期.学期
替换为：

CASE semester.semester
  WHEN 0 THEN 'Spring'
  WHEN 1 THEN 'Fall'
  WHEN 2 THEN 'All-year'
END semester

再做一张桌子。说学期时间

|  id  |  semester_time  |
|  0   |  Fall           |
|  1   |  Spring         |
|  2   |  All_year       |

然后在整个学期的时间里加入并复习

基于上表的查询的可能模型：

SELECT course.name, course.code, course.description, course.hours, semester.semester, semester.year, semester_time 
                            FROM course
                            LEFT JOIN major_course_xref ON course.id = major_course_xref.course_id
                            LEFT JOIN major ON major.id = major_course_xref.major_id
                            LEFT JOIN course_semester_xref ON course.id = course_semester_xref.course_id
                            LEFT JOIN semester ON course_semester_xref.semester_id = semester.id
                            LEFT JOIN semester_time ON semester.semester = semester_time.id

在每个循环后添加空格


只需更改值以满足您的需要。
while（$row=$query->fetch（PDO:：fetch\u ASSOC））{
while ($row = $query->fetch(PDO::FETCH_ASSOC)){       
        print $row['name'] . "<br>";
        print $row['code'] . "<br>";
        print $row['description'] . "<br>";
        print $row['hours'] . " hrs.<br>";
        print ($row['semester'] == 0) ? "FALL":( ($row['semester'] == 1) ? "Spring" : ( ($row['semester'] == 2) ? "All-year":"")) . "<br>";
        print $row['year'] . "<br>";
        print "<br>------------------------------<br />";
    }

打印$row['name']。“
”；
打印$row['code']。“
”；
打印$row['description']。“
”；
打印$row['hours'].“hrs.
”；
打印（$row['sement']==0）？“秋季”：（$row['sement']==1）？“春季”：（$row['sement']==2）？“全年”：”）。“
”；
打印$行['year']。“
”；
打印“
------------------------------------
”；
}