Dyanamic Apex

Dynamic Apex allows to create more flexible applications by providing them with the ability to:
  • Access sObject and field describe information
          Describe information provides information about sObject and field properties. For example, the describe information for an sObject includes whether that type of sObject supports operations like create or undelete, the sObject's name and label, the sObject's fields and child objects, and so on. The describe information for a field includes whether the field has a default value, whether it is a calculated field, the type of the field, and so on.
    Note that describe information provides information about objects in an organization, not individual records.
  • Write dynamic SOQL queries, dynamic SOSL queries and dynamic DML
          Dynamic SOQL and SOSL queries provide the ability to execute SOQL or SOSL as a string at runtime, while dynamic DML provides the ability to create a record dynamically and then insert it into the database using DML. Using dynamic SOQL, SOSL, and DML, an application can be tailored precisely to the organization as well as the user's permissions. This can be useful for applications that are installed from Force.com AppExchange.

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