fetchAll return false when the result is empty.

[andydeng]

example:

$pg = $this->pgsqlClientDbPool->get(1);
$s = $pg->query("select * from tbl_company where company_id=12312312"); //something not exist
$data = $pg->fetchAll($s); // the $data variable will be false

foreach ($data as $datum) // there is a warning show up
// do something

The $data variable will be FALSE, and a warning shown up in foreach statement. The code will go only if I check whether the $data is false and then give it an empty array value.

It's different behavior than most client implement.

To change this behavior is easy, change line 864 in swoole_postgresql_coro.cc file, from FAILURE to SUCCESS.

The fetchAll above will return an empty array.