yasirmturk

/*
 * A generic function that can query that given entity with the given condition and return sorted results.
 */
-(NSArray *)queryDBForEntity:(NSString *)entityName predicate:(NSPredicate *)predicate sortByField:(NSString *)sortField 
{
    NSFetchRequest *request = [[NSFetchRequest alloc] init]; 
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:[self managedObjectContext]]; 
    [request setEntity:entity];
    
    if(sortField != nil)

yasirmturk

/*
 * A generic function that inserts a new row for the given entity and fill that row with given key/values
 */
-(void)insertObjectForEntity:(NSString *)entityName objectsToInsert:(NSDictionary *)dictObjects
{
    NSError *error;
    NSManagedObject *objToInsert = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:[self managedObjectContext]];
    
    for (id key in [dictObjects allKeys]) {
        [objToInsert setValue:key forKey:[dictObjects objectForKey:key]];

yasirmturk

/*
 * Given an object delete it
 *
 * @param obj: obj to delete from database
 * @returns: true if successful in deleting else returns false 
 */
- (BOOL)deleteObject:(id)obj{
    NSError *error;
    if(obj != nil){
        [[self managedObjectContext] deleteObject:obj];

yasirmturk

/*
 * Useful function to check whether a record already exists
 */
-(BOOL)doesRecordExistForEntity:(NSString *)entity fieldToCheck:(NSString *)fieldName valueToMatch:(id)val
{
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(%K = %@)", fieldName, val];
    //NSLog(@"(P: %@)", [pred predicateFormat]);
    NSArray *arr = [self queryDBForEntity:entity predicate:pred sortByField:fieldName];
    //NSLog(@"%@", arr);
    return ([arr count] > 0);

yasirmturk

/*
 * Get a record based on the criteria
 */
- (id)getRecordFromEntity:(NSString *)entity whereField:(NSString *)fieldName isEqualTo:(id)val
{
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(%K = %@)", fieldName, val];
    //NSLog(@"(P: %@)", [pred predicateFormat]);
    NSArray *arr = [self queryDBForEntity:entity predicate:pred sortByField:fieldName];
    //NSLog(@"%@", arr);
    if ([arr count] > 0)

yasirmturk

/*
 * Get all records
 */
-(NSArray*)getAllRecordsFromEntity:(NSString *)entity{
    NSArray *arr = [self queryDBForEntity:entity predicate:nil sortByField:nil];
    //NSLog(@"%@", arr);
    return arr;
}

yasirmturk

/*
 * We can fetch a record, modify it and then call this save function to save our changes
 */
- (BOOL)saveToDb{
    NSError *error = nil;
    BOOL returnVal =  ( [[self managedObjectContext] save:&error] );
    if(error != nil)
        NSLog(@"%@", error);
    return returnVal;
}

yasirmturk

//
//  SingletonClass+ARC.h
//  the smart engineer
//
//  Copyright (c) 2013 Yasir M Turk. No rights reserved.
//

#import <foundation/Foundation.h>

@interface SingletonClass : NSObject {

yasirmturk

//
//  YTCoreDataAdapter.h
//  the smart engineer
//
//  Copyright (c) 2013 Yasir M Turk. No rights reserved.
//

@interface YTCoreDataAdapter : NSObject {
}

yasirmturk

/*
 * Log the complete ASIHTTPRequest HTTP Request
 */
+ (void)logRequest:(ASIHTTPRequest *)request{
    NSLog(@"url:%@", request.url);
    NSLog(@"method:%@", request.requestMethod);
    NSLog(@"head:%@", request.requestHeaders);
    if (request.postLength > 0) {
        NSLog(@"body:%@", [[NSString alloc]initWithBytes:[request.postBody bytes] length:request.postLength encoding:NSUTF8StringEncoding]);
    }