foreach循环数组sql查询

Question

I'm trying to select values from my database when the value != 0 but all I get is an empty array.

Here I've got an array with all the names who are also in the database.

$array  = ['helm' , 'weapon', 'amulet', 'body', 'legs', "boots", 'shield', 'gloves', 'cape'];

then I place the array in a foreach loop and place the _name and _value behind the name (in the database it is helm_name = blabla _helm value = 10 )

When the text is placed behind the word I loop through it in my query in which I try to select the name table (for example helm_name ) and the value table (for example helm_value)

foreach($array as $array_item){
    $array_item_name = $array_item.'_name';
    $array_item_value = $array_item.'_value';

    $sql = $db->prepare("SELECT ".$array_item_name." FROM player WHERE naam = :naam AND ".$array_item_value." != 0");
    $sql->execute(array(":naam" => $naam));
    $fetch = $sql->fetchAll(PDO::FETCH_ASSOC);
}

but all it returns when I run it is Array ( ) what am I doing wrong?

Answer 1

请检查数据库错误值，也应首先创建sql字符串并输出它，以便可以手动运行生成的sql语句。