root
63 lines
1.9 KiB
PHP
63 lines
1.9 KiB
PHP
<?php
|
|
|
|
namespace App\Database\Migrations;
|
|
|
|
use CodeIgniter\Database\Migration;
|
|
|
|
class RemoveClassAssignmentSemester extends Migration
|
|
{
|
|
public function up()
|
|
{
|
|
if (
|
|
$this->db->tableExists('teacher_class')
|
|
&& $this->db->fieldExists('semester', 'teacher_class')
|
|
) {
|
|
foreach ($this->indexesContainingColumn('teacher_class', 'semester') as $index) {
|
|
$this->db->query(
|
|
'DROP INDEX ' . $this->db->escapeIdentifiers($index) . ' ON ' . $this->db->escapeIdentifiers('teacher_class')
|
|
);
|
|
}
|
|
|
|
$this->db->query(
|
|
'ALTER TABLE ' . $this->db->escapeIdentifiers('teacher_class')
|
|
. ' DROP COLUMN ' . $this->db->escapeIdentifiers('semester')
|
|
);
|
|
}
|
|
}
|
|
|
|
public function down()
|
|
{
|
|
if (
|
|
$this->db->tableExists('teacher_class')
|
|
&& ! $this->db->fieldExists('semester', 'teacher_class')
|
|
) {
|
|
$this->forge->addColumn('teacher_class', [
|
|
'semester' => [
|
|
'type' => 'VARCHAR',
|
|
'constraint' => 25,
|
|
'null' => false,
|
|
'default' => '',
|
|
],
|
|
]);
|
|
}
|
|
}
|
|
|
|
private function indexesContainingColumn(string $table, string $column): array
|
|
{
|
|
$result = $this->db->query(
|
|
'SHOW INDEX FROM ' . $this->db->escapeIdentifiers($table)
|
|
. ' WHERE Column_name = ' . $this->db->escape($column)
|
|
);
|
|
|
|
$indexes = [];
|
|
foreach ($result->getResultArray() as $row) {
|
|
$index = (string) ($row['Key_name'] ?? '');
|
|
if ($index !== '' && $index !== 'PRIMARY') {
|
|
$indexes[] = $index;
|
|
}
|
|
}
|
|
|
|
return array_values(array_unique($indexes));
|
|
}
|
|
}
|