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) Once the breakpoints are set, launch the command-line MySQL client, change to the test database, and issue this command: CREATE TABLE testarc (a int, b varchar(20), c int) ENGINE=ARCHIVE; You should immediately see the debugger halt in the create() method This method is where the base data table is created Indeed, it is one of the first things to execute The my_create() method is called to create the file Notice in this method that the field iterator loops through all of the fields in the table This is important because it shows that the fields are already created They are stored in the testarcfrm file in the data folder Notice that the code is looking for a field with the AUTO_INCREMENT_FLAG set (at the top of the method); if the field is found, the code sets an error and exits.

Inside this method, the AddBusinessRules() method is called. Before that, however, the ValidationRules object needs to be given a reference to the business object so it can properly apply the validation rules to the properties. Finally, a virtual OnDeserialized method is invoked so the business developer can respond to the deserialization operation if desired. The ValidationRules object maintains a list of currently broken rules. This was used earlier in the implementation of the IsValid property, but there s value in exposing the collection itself: [Browsable(false)] [EditorBrowsable(EditorBrowsableState.Advanced)] public virtual Validation.BrokenRulesCollection BrokenRulesCollection { get { return ValidationRules.GetBrokenRules(); } } Within ValidationRules, this collection is implemented to be read-only. Even though the collection is exposed as a public property, it can t be changed by the UI. However, the UI can display the list of broken rules to the user if so desired.

Windows Forms data binding uses the IDataErrorInfo interface to interrogate a data source for validation errors. This interface allows a data source, such as a business object, to provide humanreadable descriptions of errors at the object and property levels. This information is used by grid controls and the ErrorProvider control to display error icons and tooltip descriptions. The ValidationRules object will provide a list of broken rules for each property on the object, making it relatively easy to implement IDataErrorInfo: string IDataErrorInfo.Error { get { if (!IsValid) return ValidationRules.GetBrokenRules().ToString(); else return String.Empty; } } string IDataErrorInfo.this[string columnName] { get { string result = string.Empty; if (!IsValid) { Validation.BrokenRule rule = ValidationRules.GetBrokenRules().GetFirstBrokenRule(columnName); if (rule != null) result = rule.Description; } return result; } } The Error property returns a text value describing the validation errors for the object as a whole. The indexer returns a text value describing any validation error for a specific property. In this implementation, only the first validation error in the list is returned. In either case, if there are no errors, an empty string value is returned telling data binding that there are no broken rules to report.

This is because the archive storage engine doesn t support auto-increment fields You can also see that the method is creating a meta file and checking to see that the compression routines are working properly Take a moment and step through the code and watch the iterator You can continue the execution at any time or, if you re really curious, continue to step through the return to the calling function Now, let s see what happens when we insert data Go back to your MySQL client and enter this command: INSERT INTO testarc VALUES (10, "test", -1); This time, the code halts in the get_share() method This method is responsible for creating the shared structure for all instances of the archive handler As you step through this method, you can see where the code is setting the global variables and other initialization type tasks.

To add a key, click Always in the Name column and click the New Key button An item named New Item will appear in the list Click its name and a pop-up menu will appear----choose the Edit item Type the name of the new key you d like to add Click the type to change the type to Boolean or integer as applicable, and finally set the value as desired Ignore the Name doesn t match preference manifest warning NOTE: We covered preference manifests in 10 They can help administrators discover useful preference keys to manage, but they rarely contain every possible key you can manage If you add a key to the management list for a preference domain that is not in the preference manifest (if there is one), you ll see a warning.