root
48 lines
1.3 KiB
PHP
48 lines
1.3 KiB
PHP
<?php
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namespace App\Database\Migrations;
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use CodeIgniter\Database\Migration;
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class RemoveClassAssignmentSemester extends Migration
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{
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public function up()
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{
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// Keep the legacy semester columns in place. They may be ignored by newer
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// code, but dropping them during a post-restore migrate destroys data.
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}
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public function down()
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{
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if ($this->db->tableExists('teacher_class')) {
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$this->forge->addColumn('teacher_class', [
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'semester' => [
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'type' => 'VARCHAR',
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'constraint' => 25,
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'null' => false,
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'default' => '',
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],
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]);
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}
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if ($this->db->tableExists('student_class')) {
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$this->forge->addColumn('student_class', [
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'semester' => [
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'type' => 'VARCHAR',
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'constraint' => 255,
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'null' => false,
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'default' => '',
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],
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]);
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}
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}
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private function indexExists(string $table, string $index): bool
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{
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$result = $this->db->query(
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'SHOW INDEX FROM `' . str_replace('`', '``', $table) . '` WHERE Key_name = ' . $this->db->escape($index)
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);
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return $result->getNumRows() > 0;
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}
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}
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