Question

I am trying to create login page in my application. For that I am using sqlite database(journeymapper.db3 it is database name) which has UserInformation table
For that use the fowling code:

 -(void)checkindatabase
{
NSString *direct = [[NSString alloc]init] ;
NSString *dbPath = [direct stringByAppendingPathComponent:@"journeymapper.db3"];


if(sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK)
{
    NSLog(@"open");
    NSString *sql = [[NSString alloc] initWithFormat:@"select Username='%@',Password='%@' from UserInformation",txtuser.text,txtpass.text];
    //[sql UTF8String];
        //NSLog(@"'%s'",[sql UTF8String]);
    sqlite3_stmt *statment;
    if(sqlite3_prepare_v2(database, [sql UTF8String], -1, &statment, NULL) == SQLITE_OK)
    {
         if(sqlite3_step(statment) == SQLITE_ROW)
         {

             UIAlertView* alert = [[UIAlertView alloc] initWithTitle:nil
                                                    message:@"Welcome to joureny" delegate:nil 
                                                   cancelButtonTitle:@"OK" otherButtonTitles:nil];
             [alert show];
             [alert release];  
         }


    }


    sqlite3_finalize(statment);

}
sqlite3_close(database);
}

-(IBAction)login
{
    [self checkindatabase]; 
}

I am entering right user name & password but it doesn’t show me the alertview how can I achieve this. Please help me on how I can create the login page.

Answer 1

May be 2 of ur assignment are incorrect.1. check dbpath and query

1.

    NSArray *dirPath =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir =[dirPath objectAtIndex:0];
    NSString *databasePath =[[NSString alloc] initWithString:[docDir stringByAppendingPathComponent:@"dbname.db"]];

2.

Change Your query as

NSString *sql = [[NSString alloc] initWithFormat:@"select * from UserInformation where Username='%@' and Password='%@'",txtuser.text,txtpass.text];

if it return some thing …Your username and password is correct .or else one of the text is in correct

Edited Answer

 //To check open DB or not   
 if(open DB)
   //ur code
 else
  NSLog(@"open fails & error is ::%s",sqlite3_errmsg(contactDB));

 // To validate Password    

 if (sqlite3_prepare_v2(contactDB, [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  
         NSString *username=[[NSString alloc] initWithUTF8String:(const char *)       sqlite3_column_text(statement,0)];  
         NSString *password = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement,1)];

            }
       else    
         // Authentication failed
  }

Best Regards,