checking login and password in iphone - iphone

Question

Hi i am trying to create a login and password for my app by using SQLite,, every thing is fine but the once the login button is pressed it is not entering in to home page!!!!
please find my code below:
-(void)checkindatabase{
NSArray *dirPath =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir =[dirPath objectAtIndex:0];
NSString *databasePath =[[NSString alloc] initWithString:[docDir stringByAppendingPathComponent:#"login.db"]];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(#"open");
NSString *sql = [[NSString alloc] initWithFormat:#"select * from UserInformation where Username='%#' and Password='%#'",loginName.text,password.text]; //[sql UTF8String];
//NSLog(#"'%s'",[sql UTF8String]);
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK)
{ if(sqlite3_step(statement) == SQLITE_ROW)
{
//user name is correct
//if u want to print in log use below code
homepage *hvc = [[homepage alloc]initWithNibName: nil bundle: nil];
hvc.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:hvc animated: YES];
}
else {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Login Failed!!!"
message:#"Check your PId and Password" delegate:nil
cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}}
sqlite3_finalize(statement);
}
sqlite3_close(database);
}
-(IBAction)homePage: (id)sender
{
[self checkindatabase];
}

Answer 1

Please find the code, as you asked.
-(BOOL)checkindatabase
{
NSArray *dirPath =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir =[dirPath objectAtIndex:0];
NSString *databasePath =[[NSString alloc] initWithString:[docDir stringByAppendingPathComponent:#"login.db"]];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(#"open");
NSString *sql = [[NSString alloc] initWithFormat:#"select * from UserInformation where Username='%#' and Password='%#'",loginName.text,password.text]; //[sql UTF8String];
//NSLog(#"'%s'",[sql UTF8String]);
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK)
{ if(sqlite3_step(statement) == SQLITE_ROW)
{
//user name is correct
//if u want to print in log use below code
return YES;
}
}
sqlite3_finalize(statement);
}
sqlite3_close(database);
return NO;
}
-(IBAction)homePage: (id)sender
{
if( [self checkindatabase] )
{
homepage *hvc = [[homepage alloc]initWithNibName: nil bundle: nil];
hvc.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:hvc animated: YES];
[hvc release];
}
else
{
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Login Failed!!!"
message:#"Check your PId and Password" delegate:nil
cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
}

Answer 2

As suggested by Aadhira...
Make checkindatabase with return type BOOL and return TRUE if Login successful and FALSE otherwise.
Then on the basis of BOOL value navigate to Home Page.
you cannot let other function to navigate the view, while performing IBAction method.
EDIT :
I am not looking to your database code.. i have simply shown you way how to use the BOOL return values.... Also mention errors if any you faced.
-(BOOL)checkindatabase{
NSArray *dirPath =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir =[dirPath objectAtIndex:0];
NSString *databasePath =[[NSString alloc] initWithString:[docDir stringByAppendingPathComponent:#"login.db"]];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(#"open");
NSString *sql = [[NSString alloc] initWithFormat:#"select * from UserInformation where Username='%#' and Password='%#'",loginName.text,password.text]; //[sql UTF8String];
//NSLog(#"'%s'",[sql UTF8String]);
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK)
{ if(sqlite3_step(statement) == SQLITE_ROW)
{
//user name is correct
//if u want to print in log use below code
flag = YES;
}
else {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Login Failed!!!"
message:#"Check your PId and Password" delegate:nil
cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[alert release];
flag = NO;
}}
sqlite3_finalize(statement);
}
sqlite3_close(database);
return flag;
}
-(IBAction)homePage: (id)sender
{
BOOL newFlag = [self checkindatabase];
if(newFlag)
{
homepage *hvc = [[homepage alloc]initWithNibName: nil bundle: nil]
hvc.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:hvc animated: YES];
}
}