我在项目中使用 multiselect 下拉列表。现在我想更新mysql数据库中的多选下拉数组值。我成功地在数据库中添加了多选值,但是当我尝试更新时,我得到了错误的结果。例如,如果数组中的值类似于数组([0] => A [1] => B),并且我运行循环来更新数据库中的值,则更新的值始终为第2数组的值(例如[1] => B)。我不知道问题在哪里帮助..下面是我的代码..
HTML
<select name="countries[]" id="countries" multiple="multiple" placeholder="Which countries did you sell your products in *" required>
<option value="" disabled="disabled" selected>Which countries did you sell your products in *</option>
<option value="Afghanistan">Afghanistan</option>
<option value="Albania">Albania</option>
<option value="Algeria">Algeria</option>
<option value="American Samoa">American Samoa</option>
<option value="Andorra">Andorra</option>
<option value="Angola">Angola</option>
<option value="Anguilla">Anguilla</option>
PHP
$countries = $_POST['countries'];
$user_id = $_SESSION['user_session'];
$size=sizeof($countries);
for($i=0;$i<$size;){
$count = $trade_info->update_supplier_last_financial_count($user_id, $countries[$i]);
$i++;
}
功能(update_supplier_last_financial)
public function update_supplier_last_financial_count($user_id,$last_count){
$db = db::getInstance();
$pdo = $db->getConnection();
try {
$stmt = $pdo->prepare("UPDATE supplier_last_financial_countries SET countries = :last_count WHERE user_id = :user_id ");
$stmt->bindparam(":user_id", $user_id);
$stmt->bindparam(":last_count", $last_count);
$stmt->execute();
return $stmt;
}
catch(PDOException $e) {
echo $e->getMessage();
}
}
提前致谢..
答案 0 :(得分:1)
您的查询一遍又一遍地更新同一行。它受WHERE
的限制,但WHERE
($user_id
)的条件永远不会改变。
这样的事可能有用:
$countries = $_POST['countries'];
$user_id = $_SESSION['user_session'];
foreach ($countries as $country) {
$count = $trade_info->update_supplier_last_financial_count($user_id, $country);
}
public function update_supplier_last_financial_count($user_id,$last_count) {
$db = db::getInstance();
$pdo = $db->getConnection();
try {
$stmt = $pdo->prepare("DELETE FROM supplier_last_financial_countries WHERE user_id = :user_id ");
$stmt->bindparam(":user_id", $user_id);
$stmt->execute();
$stmt = $pdo->prepare("INSERT INTO supplier_last_financial_countries SET countries = :last_count, user_id = :user_id ");
$stmt->bindparam(":user_id", $user_id);
$stmt->bindparam(":last_count", $last_count);
$stmt->execute();
return $stmt;
} catch(PDOException $e) {
echo $e->getMessage();
}
}
答案 1 :(得分:0)
如果您需要在一列中存储多个国家/地区,则应将它们存储为一组(即字符串中的逗号分隔值)。试试这个。
int
为此,您需要将数据类型从varchar
更改为numpy.argmax
您也可以用同样的方式更新国家/地区值。