Question

如何获取sql搜索查询的计数

$u = new user();

$sql = "SELECT a.id FROM `accounts` AS a LEFT JOIN `users` AS u ON a.id = u.id WHERE a.id IS NOT NULL ";

$gender = $this->input->post('gender');

if($gender != NULL)
{
  $sql .= "AND u.gender = '".$gender."' ";
}

$u->query($sql);

如何在$u->query($sql);中计算查询结果。我需要对其进行验证。如果查询结果计数为0，我需要设置一条消息。我正在使用PHP Codeigniter，datamapper库。

谢谢!!!

Answer 1

只需使用 count（）这样的功能

...
$result = $u->query($sql);
$total_data = count($result);

Answer 2

if($u->exists())
{
 echo "Found" // Do something
}
else
{
 echo "Nothing found" //Do something
}

Answer 3

$result = $this->db->get();

For Codeigniter use $count = $result->num_rows(); // HERE IS YOUR COUNT

For OOP PHP use $count = $result->num_rows;

如何获取sql搜索查询的计数？

3 个答案: