[db4o-om commit] r48 - wiki
codesite...@google.com
Date: Tue May 13 07:25:03 2008
New Revision: 48
Added:
wiki/Object_Manager_Tour.wiki
Log:
Created wiki page through web user interface.
Added: wiki/Object_Manager_Tour.wiki
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+Upon starting Object Manager, you will see the Connection Manager:
+
+At this point, you can either:
+
+ * Open a db4o database file
+ * Open a connection to a db4o database server
+
+In order to open a db4o database file, simply click Browse and choose
the db4o database file to open, then click Connect.
+
+If you just want to try ObjectManager, you can create a demo database
by clicking File - Create Demo Db. This will create and open a database
for you to use.
+Stored Classes Tree
+
+Once you click connect, the main ObjectManager window will open. All
of the classes that have been stored will be displayed on the left in a tree:
+
+Querying for objects
+
+To view the objects stored in your db4o database, you must query for
it. The query editor is at the top of the main window and looks like this:
+
+To quickly see all of the objects of a certain class, just double
click the class name in the stored classes tree. This will
automatically build your query for you, and you just have to click the
Submit button to the right of the query text area.
+Query Language
+
+The Object Manager query language, Sql4o, is based on the SQL query
language, so if you know SQL, you should have no problems with Sql4o.
+
+Syntax:
+
+[SELECT select_expr, ...]
+
+FROM object_type
+
+[WHERE where_condition]
+
+For example, to query all Contacts in the Demo Db:
+
+FROM demo.objectmanager.model.Contact
+
+To query all contacts with age 50.
+
+FROM demo.objectmanager.model.Contact where age 50
+Query Results
+
+After executing a query, you will see the query results in table:
+
+From this table, you can edit all primitive fields, Dates, and Strings
by double clicking on a cell.
+
+You can also open an object up in a tree view so that you can descend
further into the object:
+
+You can also edit fields from this view.
+Database Management
+
+The following management features are currently available:
+
+ * Backup
+ * Defragment
+ * Refactoring (Schema Evolution)
+
+Back-up is available from "Manage-Backup..." menu. It will ask you for
a location to store the back-up, once that is chosen, the back-up copy
of your database will be created. The backed-up copy is a fully
functional database and can be used by replacing your current database.
+
+Defragment is available from "Manage-Defragment" menu or
through "Ctrl-Shift-D" shortcut. This will execute the db4o
defragmentation process on your database. For more information about
the defragment see Defragment.
+
+Refactoring allows you to change the structure of persistent classes
in a db4o database. Object Manager helps you to automate the simplest
refactoring: renaming of class fields.
+
+In order to rename a class field double-click the class in a "Stored
Classes" tree - class view will open on the right panel. Click "Edit"
button at the bottom and change field names as necessary.
+
+When the renaming is done, click "Stop Editing" button at the bottom.
Remember to change your application classes accordingly.
+
+
+About This Page
+Title: Object Manager Tour
+Moderated By:
+Created: 10-24-2006, 10:08 PM
+Modified: 08-12-2007, 12:52 AM
+Last Modified By: Tetyana Loskutova
+Revision Number: 12
+Relative Base: /Resources/Reference/Object_Manager_For_Db4o
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+Topic Weight: 30
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+Indexed: True
+ThreadID: 14185
+PostID: 39409
+SectionID: 127
+File Path: C:\Workspace\developer.db4o.com\app_data\wiki_data\Resources\Reference\Object_Manager_For_Db4o\Object_Manager_Tour.topic.xml
+Internal Uri: wiki:///Resources/Reference/Object_Manager_For_Db4o/Object_Manager_Tour
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