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Editing Records
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An active dataset must be in dsEdit mode before an application can modify records. In your code you can use the Edit method to put a dataset into dsEdit mode if the read-only CanModify property for the dataset is True.

Once a dataset is in dsEdit mode, a user can modify the field values for the current record that appears in any data-aware controls on a form. Data-aware controls for which editing is enabled automatically call Post when a user executes any action that changes the current record (such as moving to a different record in a grid).
If you have a navigator component on your form, users can cancel edits by clicking the navigator's Cancel button. Canceling edits returns a dataset to dsBrowse state.

In code, you must write or cancel edits by calling the appropriate methods. You write changes by calling Post. You cancel them by calling Cancel. In code, Edit and Post are often used together. For example,

with ABSTable1 do
begin
  Edit;
  FieldValues['CustNo'
] := 1234;
  Post;
end;

In the previous example, the first line of code places the dataset in dsEdit mode. The next line of code assigns the number 1234 to the CustNo field of the current record. Finally, the last line writes, or posts, the modified record. Posting writes the change back to the database.
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