System.QueryException：列表有超过 1 行分配给 SObject

Question

  public void search ()
   {
    
        string searchquery='select Car_Name__c ,id  from car__c where Car_Name__c  like \'%'+ searchkey+'%\' Limit 20';
        sim=Database.query(searchquery);
        

   }

System.QueryException: List has more than 1 row for assignment to SObject Error is in expression '{:search}' in component apex:commandButton in page simpsons_vf01_car_show. Class.Simpsons_Cl1_classCar:search, line 36, column 1

Answer 1

Presumably the value sim is of type Car__c . You cannot assign the result of a query that returns anything other than exactly one record to a value whose type is an SObject. In particular, this does not make sense when you're performing a search query with a LIMIT 20 clause.

You should type your variable as a List<Car__c> .