如何在MySQL查詢中使用數組數組常量數組？

Question

恆前：define('PERMANENT_EMPLOYEE',array('1,'2','3'));

SELECT * from employee where id IN('PERMANENT_EMPLOYEE'); 

這上面選擇不工作。

Answer 1

您不能將數組分配給常量。試着這樣做：

define('PERMANENT_EMPLOYEE', json_encode(array('1','2','3'))); 

$sql = 'SELECT * from employee where id IN(' . implode(',', json_decode(PERMANENT_EMPLOYEE, true)) . ')'; 

Answer 2

你需要傳遞一個字符串，如您使用數組現在

define("PERMANENT_EMPLOYEE","'1','2','3'"); 

echo 'SELECT * from employee where id IN ('.PERMANENT_EMPLOYEE.')'; 

我已經以這種方式

Answer 3

使用PHP檢查其加入功能然後寫下你的查詢如下： -

$ids = join(',',[1,2,3]); 
$sql = "SELECT * FROM employee WHERE id IN ($ids)"; 

如果你想通過常量使用數組，那麼你應該使用serialize，

define('PERMANENT_EMPLOYEE',serialize(array(1,2,3))); 
$ids = join(',',unserialize(PERMANENT_EMPLOYEE)); 
$sql = "SELECT * FROM employee WHERE id IN ($ids)";