In apex, objects can be created and manipulated dynamically. The only thing that needs to be known is Object Name.
Salesforce maintains a static object called 'Schema'. This will contain information about all the objects in the org in a map format. If the object is a standard object, the key will be just it's name. For custom objects, they are maintained under key as 'NamespacePrefix__'+'Object Name'+'__c'. For example, if the namespace is nspTest and the object name is Tester, then the key will be 'nspTest__Tester__c'. This complete name is called as API name.
Every Object in salesforce is inherited from "sObject" and is related to a schema. The information about the object is called "describe". It includes the fields related to this objects, child relationships like the lookup's master-childs etc.... If the field it custom field, the name will have '__c' suffix.
Salesforce maintains a static object called 'Schema'. This will contain information about all the objects in the org in a map format. If the object is a standard object, the key will be just it's name. For custom objects, they are maintained under key as 'NamespacePrefix__'+'Object Name'+'__c'. For example, if the namespace is nspTest and the object name is Tester, then the key will be 'nspTest__Tester__c'. This complete name is called as API name.
Every Object in salesforce is inherited from "sObject" and is related to a schema. The information about the object is called "describe". It includes the fields related to this objects, child relationships like the lookup's master-childs etc.... If the field it custom field, the name will have '__c' suffix.
Schema.SObjectType targetType = Schema.getGlobalDescribe().get(sObjName);
Map fieldMap = targetType.getDescribe().fields.getMap();
Schema.SObjectField sField = fieldMap.get(fieldToUpdate); 