src/main/java/com/bib/essensbestellungsverwaltung/Database.java

@@ -482,12 +482,12 @@ public class Database {
                 sb.append(" SET ");
                 sb.append(header[1]);
                 sb.append(" = ");
-                sb.append(values[1]);
+                sb.append("'" + values[1] + "'");
                 for(int i = 2; i < header.length; i++){
                     sb.append(", ");
                     sb.append(header[i]);
                     sb.append(" = ");
-                    sb.append(values[i]);
+                    sb.append("'" + values[i] + "'");
                 }
                 sb.append(" WHERE ");
                 sb.append(header[0]);