你的SQL語法有錯誤;檢查與您的MySQL服務器版本相對應的手冊，在第1行的'1'附近使用正確的語法

Question

正如我寫這段代碼$this->setlist();是這個錯誤，在寫這行之前我沒有遇到任何錯誤，你能幫忙嗎我有這個嗎？

public function setlist(){ 
    $mysql = new Mysql(); 
    $query = "SELECT * FROM student where cohortid = '$this->cohort' && programid = '$this->program && departmentid = '$this->department'"; 
    $mysql->execute($query); 
    while($row = $mysql->fetch_array()){ 
     $this->list[] = $row; 
    } 
    array_unshift($this->list, "test"); 
    unset($this->list[0]); 
} 


public function display_id_firstname_and_lastname(){ 
    *$this->setlist();* 
    $html = new Html(); 
    $html->table("table table-bordered"); 

    $html->row(); 
    $html->column(); echo "S#"; $html->closecolumn(); $html->column(); echo "FirstName"; $html->closecolumn(); $html->column(); echo "LastName"; $html->closecolumn(); 
    $html->closerow(); 

    foreach($this->list as $key => $value){ 
     $html->row(); 
     $html->column(); echo $key; $html->closecolumn(); $html->column(); echo $value['firstname']; $html->closecolumn(); 
     $html->column(); echo $value['lastname']; $html->closecolumn(); 
     $html->closerow(); 

    } 

    $html->closetable(); 
} 

Answer 1

首先，您的某個變量缺少'。

，如果你想獲得一個雙引號字符串文本內使用時從對象的屬性值包裝在{}現場其次，你應該使用AND而不是&&

第三。

$query = "SELECT * 
    FROM student 
    WHERE cohortid = '{$this->cohort}' 
     AND programid = '{$this->program}' 
     AND departmentid = '{$this->department}'";