Add functions for updating / deleting groups

src/NodaGroup.php

@@ -44,6 +44,32 @@ final class NodaGroup {
 
     }
 
+    /**
+     * Returns basic description of a group.
+     *
+     * @param integer $group_id Group ID.
+     *
+     * @return array{name: string, comment: string}
+     */
+    public function getDescription(int $group_id):array {
+
+        $result = $this->_mysqli_noda->query_by_stmt("SELECT `group_name`, `comment`
+            FROM `group`
+            WHERE `group_id` = ?", "i", $group_id);
+
+        if (!($cur = $result->fetch_row())) {
+            $result->close();
+            throw new MDmainEntityNotExistentException("This group does not seem to exist");
+        }
+        $result->close();
+
+        return [
+            'name' => $cur[0],
+            'comment' => $cur[1],
+        ];
+
+    }
+
     /**
      * Adds a group.
      *
@@ -54,6 +80,10 @@ final class NodaGroup {
      */
     public function insert(string $name, string $comment = ''):int {
 
+        if (empty($name)) {
+            throw new MDpageParameterMissingException("Name cannot be empty when adding groups.");
+        }
+
         $insertStmt = $this->_mysqli_noda->do_prepare("INSERT INTO `group`
             (`group_name`, `comment`)
             VALUES
@@ -68,6 +98,40 @@ final class NodaGroup {
 
     }
 
+    /**
+     * Updates a group.
+     *
+     * @retun void
+     */
+    public function update(int $group_id, string $name, string $comment = ''):void {
+
+        if (empty($name)) {
+            throw new MDpageParameterMissingException("Name cannot be empty when adding groups.");
+        }
+
+        $insertStmt = $this->_mysqli_noda->do_prepare("UPDATE `group`
+            SET `group_name` = ?,
+                `comment` = ?
+            WHERE `group_id` = ?");
+
+        $insertStmt->bind_param("ssi", $name, $comment, $group_id);
+        $insertStmt->execute();
+        $insertStmt->close();
+
+    }
+
+    /**
+     * Deletes a group.
+     *
+     * @retun void
+     */
+    public function delete(int $group_id):void {
+
+        $this->_mysqli_noda->update_query_by_stmt("DELETE FROM `group`
+            WHERE `group_id` = ?", "i", $group_id);
+
+    }
+
     /**
      * Adds actors to a nodac group.
      *