我使用下面的函数从mysql数据库获取数据
我的mododel.php的代码包装是:
function get_all_devices($user_id = NULL) {
if ($user_id) {
$sql = "
SELECT *
FROM {$this->_db}
WHERE user_id = " . $this->db->escape($user_id) . "
";
$query = $this->db->query($sql);
if ($query->num_rows()) {
return $query->row_array();
}
}
return FALSE;
}
DB结构cols: id, user_id, device, value
但是它只提取最后一条记录。我怎么能得到所有的记录在一个数组
用result_array()
代替row_array()
function get_all_devices($user_id = NULL) {
if ($user_id) {
$sql = "
SELECT *
FROM {$this->_db}
WHERE user_id = " . $this->db->escape($user_id) . "
";
$query = $this->db->query($sql);
if ($query->num_rows() > 0) {
return $query->result_array();
}
}
return FALSE;
}
将返回所有记录。row_array()
只返回一条记录
好的,我将重构代码并在需要的地方进行修改:
function get_all_devices($user_id = NULL) {
if ($user_id) {
$this->db->where('user_id', $user_id);// you don't have to escape `$user_id` value, since `$this->db->where()` escapes it implicitly.
$query = $this->db->get($this->_db); //executes `select *` on table `$this->_db`, and returns.
//if you want to get only specific columns, use $this->db->select('col1, col2'), otherwise you don't need to specify it, since it implicitly selects everything.
if ($query->num_rows()) {
return $query->result_array();//use result_array() to retrieve the whole result instead of row_array() which retrieves only one row;
}
}
return FALSE;
}