问题描述
我正在尝试列出来自school_location_id = 1的学校的所有学生,我使用codeigniter的 USE 连接到多个学校数据库。我的挑战是仅列出最后一所学校的学生。 下面是我的代码,
$schools = $this -> db->select('*')
->from('schools')
->where('schools.school_location_id',1)
->get()->result_array();
foreach ($schools as $row) :
$school_db_name = $row['school_db_name'];
$this->db->query("use $school_db_name"); // here I switch school database,cause I'm connected to multiple school databasees
$school_students = $this->db->select('*')
->from('school_students')
->get()->result_array();
endforeach;
$recipients = array_merge($school_students);
foreach ($recipients as $row) :
echo $row['name'];
endforeach;
解决方法
$school_students
对于foreach循环的每一遍都将被覆盖。一种选择是简单地将结果添加到数组中,如下所示:
foreach($schools as $row):
$school_db_name = $row['school_db_name'];
$this->db->query("use $school_db_name");
$school_students[] = $this->db->select('*')
->from('school_students')
->get()->result_array();
endforeach;
如果之后需要展平阵列,则可以使用以下示例:
$recipients = array_merge(...$school_students)