TGEntryPanel
TGEntryPanel is designed to read data from a TGTable, and to insert or update data to it, very efficiently.
It is currently under development in version trunk (Gestinux_util 1.4).
A TGEntryPanel has a Table property. You need one TGEntryPanel for each table, but a form can have several TGEntryPanel.
For each data fields of the TGTable to be displayed or saved, must exist a Control named after the field name with the prefix 'Edit' (except TGEditButton, see below). We do not have added a property to allow other names, to avoid complex mapping. Any error will be visible very early during development (if Assert is enabled).
The control fields can be :
To be eligible, a control must inherit from TCustomGLabelEdit and implement 3 methods : Clear, ReadFromQuery and Save.
ReadFromQuery requires a Sql Query. This is to handle TGEditButton in one SELECT, which is more efficient than several. In the future, we could parse the foreign key constraints to find the data automatically...
For a TGEdit, 2 events can be specified to allow some specific transformation of data (e.g. a percent displayed as 12.3% and saved as 1230 in the database, see FormTax). This could be extended to other components in the future, if useful.
A TGCombobox must be filled with AddItem and InsertItem. These methods associate to each item the corresponding code in the database. This must be done in form's events : FormCreate or Translate.
For a TGEditButton, The SQL query must return 2 fields : <ControlName>Id and <ControlName>Text and the TGTable must have a <ControlName>Id to save the data (See FormTax).
Warning : The Save method don't perform a Commit, since other data could be saved in the same transaction.