convert description fields to varchar via migration, fixes #2497

Closes #2497

Merge request studip/studip!1684

db/migrations/5.1.45_convert_description_columns_to_varchar.php

+<?php
+
+/**
+ * @see https://gitlab.studip.de/studip/studip/-/issues/2497
+ */
+final class ConvertDescriptionColumnsToVarchar extends Migration
+{
+    public function description()
+    {
+        return 'Convert the `description` columns in tables `termine`, `ex_termine`and `semester_data` to VARCHAR.';
+
+    }
+
+    protected function up()
+    {
+        $query = "ALTER TABLE `termine`
+                  CHANGE COLUMN `description` `description` VARCHAR(255) DEFAULT NULL";
+        DBManager::get()->exec($query);
+
+        $query = "ALTER TABLE `ex_termine`
+                  CHANGE COLUMN `description` `description` VARCHAR(255) DEFAULT NULL";
+        DBManager::get()->exec($query);
+
+        $query = "ALTER TABLE `semester_data`
+                  CHANGE COLUMN `description` `description` VARCHAR(255) NOT NULL DEFAULT ''";
+        DBManager::get()->exec($query);
+    }
+
+    protected function down()
+    {
+        $query = "ALTER TABLE `semester_data`
+                  CHANGE COLUMN `description` `description` TEXT NOT NULL";
+        DBManager::get()->exec($query);
+
+        $query = "ALTER TABLE `ex_termine`
+                  CHANGE COLUMN `description` `description` TEXT DEFAULT NULL";
+        DBManager::get()->exec($query);
+
+        $query = "ALTER TABLE `termine`
+                  CHANGE COLUMN `description` `description` TEXT DEFAULT NULL";
+        DBManager::get()->exec($query);
+    }
+}