如何获得sql搜索查询的计数?
问题描述:
如何获得SQL搜索查询如何获得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);
如何获得在$u->query($sql);
。我在查询结果的数量需要设置一个验证它的计数。如果查询结果计数为0,则需要设置消息。我使用PHP Codeigniter,数据映射器库。
谢谢!!!
答
if($u->exists())
{
echo "Found" // Do something
}
else
{
echo "Nothing found" //Do something
}
答
只需使用计数()函数这样
...
$result = $u->query($sql);
$total_data = count($result);
答
$result = $this->db->get();
For Codeigniter use $count = $result->num_rows(); // HERE IS YOUR COUNT
For OOP PHP use $count = $result->num_rows;
'SELECT COUNT(*)FROM ...'?但是你应该使用准备好的语句。 –