我的库文件ERROR :: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, null given
中有一个mysqli错误,任何人帮我解决它
我的安装程序文件:
public function __construct()
{
$CI = &get_instance();
$CI->load->database();
if ($CI->db->database == '') {
header('location:install/');
} else {
//query from installer tbl
$installer = mysqli_query('SELECT installer_flag FROM installer');
$item = mysqli_fetch_assoc($installer);
$flag = $item['installer_flag'];
// if installer_flag = 0
if ($flag == 0) {
// make it 1
mysqli_query('UPDATE installer SET installer_flag=1 WHERE id=1');
if (is_dir('install')) {
header('location:install/success.php');
}
}
//run this code
//else nothing
}
}
错误:mysqli_fetch_assoc()期望参数1为mysqli_result,给定为null
答案 0 :(得分:3)
如果您使用CI,则使用其内置函数来获取结果
$query = $this->db->query('SELECT installer_flag FROM installer');
foreach ($query->result_array() as $row)
{
echo $row['title'];
}
答案 1 :(得分:1)
第一名: mysqli_query
预计两个参数第一个参数是connection object
第二个参数是sql query
示例:
mysqli_query($connection_object,$query);
Codeingniter:
$result = $this->db->query('SELECT installer_flag FROM installer')->result();
print_r($result);