As it was pointed out in chapter 24 “Browsing a table”, when the user opens a table browser window, ObjectLand automatically creates a browsed query including all records and fields of the table into it. When a browser window of EDB table is opened, a browsed query of EDB is created automatically just like in the previous case, that is, ObjectLand executes SQL request, the result of which will be a set of all records of EDB table with all their fields.
To browse EDB table, it is necessary to perform the same operations as for an ordinary ObjectLand table: the command of the navigation window Edit+Open or double-click by the left mouse button on the name of this table in the list pane.
Table browser window will be opened. It is almost the same as for an internal table (see chapter 24 “Browsing a table”, figure 24-1). Some distinctions in the set of menu commands and in the displayed data are connected with peculiarities of EDB tables which differ them from internal tables of GDB.
The menu Query does not contain commands Copy and Merge, when EDB tables are browsed, because ObjectLand cannot perform these complex operations with the data “foreign” to it. There is no Export command either, because it is intended for transformation of internal tables of ObjectLand into the format of other database management systems, and external DB is already stored in the format which is “foreign” for ObjectLand.
The menu Fields for EDB table does not have the command Edit, since the possibility to change data values for EDB is determined by peculiarities of selected mode of connection with the data source. There is no command Total because it would require execution of laborious requests to the data source to perform operations of total calculations.
The status bar does not always show the total number of records of the browsed EDB table. If a dynamic cursor is used to work with a table, the number of records can change in the course of browsing not depending on user's actions.
 |  |
