PHP mysql使用FIND IN SET來搜索列值

Question

這是我的db表“課程”

當您添加多個年齡組和國家/地區的數據時，我想檢查它是否已存在於db上

示例名稱不能與同一國家+年齡組合重復

如果name =“sw”，則用戶無法再次為2年級添加國家1或4或5或3

編輯

$age1 = explode(",", $age);
$country1 = explode(",", $country);

foreach($age1 as $ages)
{
    foreach($country1 as $country2)
    {
        $where = "find_in_set( $country2,`country`) <> 0 AND find_in_set( $ages,`age`) <> 0 AND `name` = '" . $name . "'";
    }

}

請檢查以下結果......

 var_dump($age);exit;

string '2,1' (length=3)

var_dump($country);exit;

string '1,4,2,3' (length=7)

 var_dump$country1

array (size=2)
  0 => string '2' (length=1)
  1 => string '1' (length=1)

后續代碼var_dump（$ AGE-1）;退出;

array (size=4)
  0 => string '1' (length=1)
  1 => string '4' (length=1)
  2 => string '2' (length=1)
  3 => string '3' (length=1)

Answer 1

這里你用了兩次相同變量的$，這里沒有使用它。

$where = $country." IN  country AND ".$age." IN age";
$this->db->select("music_lessons","*",$where);
$res = $this->db->getResult();

返回結果行數