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POReading the same record from sqlite db in iphone app
 

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  1. POReading the same record from sqlite db in iphone app
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    <p>In my iphone app I use a sqlite db. I have an icon that starts the reading from db and stores it in table view. The problem is: if I select the icon again, it doubles the table view with the same record. I know the reason, because every time I select the icon the program goes to 'readSalesFromDatabase' and to 'tableView cellForRowAtIndexPath'. The problem is how to avoid this?<br> Here is my code:</p> <h2>In AppDelegate:</h2> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions { // db name databaseName = @"saSh5.sqlite"; //creating db [self checkAndCreateDatabase]; //deals will hold the retrive data deals = [[NSMutableArray alloc] init]; return YES; </code></pre> <p>}</p> <pre><code>-(void) readSalesFromDatabase { if(sqlite3_open([databasePath UTF8String], &amp;database) == SQLITE_OK) { // Setup the SQL Statement and compile it for faster access // const char *sqlStatement = "select * from UsersSale"; const char *sqlStatement = "select us.userID , us.saleStoreID, from UsersSale us order by us.saleID"; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, sqlStatement, -1, &amp;compiledStatement, NULL) == SQLITE_OK) { // Loop through the results and add them to the feeds array while(sqlite3_step(compiledStatement) == SQLITE_ROW) { // Read the data from the result row NSInteger auserID = sqlite3_column_int(compiledStatement, 0); NSInteger asalStoreID = sqlite3_column_int(compiledStatement, 1); // Create a new Sale object with the data from the database Deals *sfl = [[Deals alloc] initWithName:auserID saleStoreID:asalStoreID]; [deals addObject:sfl]; [sfl release]; } } // Release the compiled statement from memory sqlite3_finalize(compiledStatement); } sqlite3_close(database); </code></pre> <p>}</p> <h2>In Controller:</h2> <pre><code> - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.view.backgroundColor = [UIColor whiteColor]; self.title = @"Deals"; self.myTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain]; self.myTableView.dataSource = self; self.myTableView.delegate = self; [self.view addSubview:self.myTableView]; AppDelegate *appDelegate = ( AppDelegate *)[[UIApplication sharedApplication] delegate]; [appDelegate readSalesFromDatabase]; </code></pre> <p>}</p> <pre><code>- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UILabel *product, *name; UITableViewCell *result = nil; if ([tableView isEqual:self.myTableView]){ static NSString *TableViewCellIdentifier = @"MyCells"; result = [tableView dequeueReusableCellWithIdentifier:TableViewCellIdentifier]; if (result == nil){ result = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleSubtitle reuseIdentifier:TableViewCellIdentifier]; result = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:TableViewCellIdentifier] autorelease]; AppDelegate *appDelegate = ( AppDelegate *)[[UIApplication sharedApplication] delegate]; Deals *dls = (Deals *)[appDelegate.deals objectAtIndex:indexPath.row]; result.textLabel.lineBreakMode= UILineBreakModeWordWrap; product = [[[UILabel alloc] initWithFrame:CGRectMake(25.0, 0.0, 220.0, 15.0)] autorelease]; product.tag = MAINLABEL_TAG; product.font = [UIFont systemFontOfSize:14.0]; product.textAlignment = UITextAlignmentLeft; product.textColor = [UIColor blackColor]; product.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleHeight; product.text = dls.saleSpecificProduct; [result.contentView addSubview:product]; } return result; } </code></pre>
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