deletion in sqlite database

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C

Mobile

iPhone

Objective-C

iOS

// This is deletion button
- (IBAction)deletedata:(id)sender {
NSArray *data1 = [[DBManager getSharedInstance]deletebyregisterno: findByRegisterNumberTextField.text];
if (data1 == nil) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:
@"Data not found" message:nil delegate:nil cancelButtonTitle:
@"OK" otherButtonTitles:nil];
[alert show];
}
else
{
NSLog(@"delete success");

}
}


// this is in DBManger : NSObject

-(NSArray*) deletebyregisterno:(NSString*)registerNumber
{
NSLog(@"here");

const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSLog(@"here inside");

NSString *querySQL1 = [NSString stringWithFormat:@"delete from studentDetail where regno=\"%@\"",registerNumber];
const char *querySQL1_stat = [querySQL1 UTF8String];
if (sqlite3_prepare_v2(database, querySQL1_stat,-1, &statement, NULL)== SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_DONE)
{
return YES;
NSLog(@"Deleted row");
}
}
else {
return NO;
}
sqlite3_reset(statement);
}
return nil;

}

on clicking deletion button is dispalys no data found...
what is wrong in it....