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Sample Programs from NeXSTEP 3.3

/* QBE.h:
 * You may freely copy, distribute, and reuse the code in this example.
 * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
 * fitness for any particular use.
 *
 * Written by Craig Federighi
 *  
 *
 * Example of a Query By Example object: Connects to an EOController for an
 * easy contruction of qualifiers from data entered into fields of an 
 * existing user interface.
 */

#import <appkit/appkit.h>
#import <eointerface/eointerface.h>
#import <apps/InterfaceBuilder.h>

@interface QBE:Object 
{
    EOController *controller;
    EODatabaseDataSource *realsource;

    NSMutableArray *removedAssociations;
    EOController *nextController;
    id controllersDelegate;
    NSMutableArray *wereUneditableAssoc;
    NSMutableArray *wereEditableAssoc;
    
    EOQualifier *originalQualifier;
}

- enterQueryMode:sender;
    // switches controller from displaying database
    // data to displaying a blank row in which query info can be entered.
    // Sending this message when already in Query mode will add a new row to
    // the controller to allow entry of another disjoined qualifier.

- toggleQueryFetch:sender;
    // if not in query mode, enters query mode.  If in query mode, does
    // applyQualifier (and exits query mode)
    
- applyQualifier:sender;
    // constructs a qualifier with ANDing within columns and ORing rows
    // Sets the qualifier in the datasource and issues a fetch on the
    // controller.
     
- applyDisjointQualifier:sender;
    // like applyQualifier, but ORs within columns
    
- exitQueryMode:sender;
    // reverts to original qualifier and fetches.

- addQuery:sender;
    // add a line to the query controller and select it  

@end

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