Codeigniter:错误无法将CI_DB_mysqli_结果类型的对象用作数组

我目前有问题的Codigniter

这是我的密码

    public function move($data)
{
    $sku = $data['sku'];
    $store = $data['store_id'];
    $sql = "SELECT * FROM products WHERE sku = ? AND store_id = ?";
    $query = $this->db->query($sql, array($data['sku'], $data['store_id']));

    if($query->result_array() != "") {
        $data['qty'] =  $data['qty'] + $query['qty'] ;  //Error here
        $insert = $this->db->query('products', $data);
        return ($insert == true) ? true : false;
    }
    else{

    }
}

在我运行项目的地方，我得到了这个错误

Type: Error    
Message: Cannot use object of type CI_DB_mysqli_result as array
Filename: C:\xampp\htdocs\index\stock\application\models\Model_products.php

我已经上网寻求解决办法，但我不能解决这个问题

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有人能帮我吗？

您可能使用了错误的变量。试试这个：

public function move($data)
{
    $sku = $data['sku'];
    $store = $data['store_id'];
    $sql = "SELECT * FROM products WHERE sku = ? AND store_id = ?";
    $query = $this->db->query($sql, array($data['sku'], $data['store_id']));
    $result_array = $query->result_array();
    if($result_array) {
        $data['qty'] =  $data['qty'] + $result_array['qty'] ;  //Error here
        $insert = $this->db->query('products', $data);
        return ($insert == true) ? true : false;
    }
    else{

    }
}

$query->result_array（）将从数据库返回满足查询条件的行数组。如果只需要一行，则必须修改它

public function move($data)
{
    $sku = $data['sku'];
    $store = $data['store_id'];
    $sql = "SELECT * FROM products WHERE sku = ? AND store_id = ?";
    $query = $this->db->query($sql, array($data['sku'], $data['store_id']));

if($query->num_rows() > 0){
    $row = $query->row();  // select only first row of the query result
    $data['qty'] =  $data['qty'] + $row['qty'] ;
    $insert = $this->db->query('products', $data);  // don't know what you are doing here
    return ($insert == true) ? true : false;
}else{
}
}

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使用

var\u dump（$var）总是很有帮助的或更好地使用调试器。变量$query不存储结果。