Creating an SQLite3 database file through Objective-C

// Create DB

-(NSString *) filePath
{
 NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentDirectory=[paths objectAtIndex:0];
 return [documentDirectory stringByAppendingPathComponent:@"LoginDatabase.sql"];
}

// Open DB

-(void)openDB
{
 if(sqlite3_open([[self filePath]UTF8String], &db) !=SQLITE_OK)
 {
   sqlite3_close(db);
   NSAssert(0, @"Database failed to Open");
 }
}

// Create Table

-(void) createTableNamed:(NSString*)tableName withField1:(NSString*) field1 withField2:(NSString*) field2

{
   char *err;
   NSString *sql=[NSString stringWithFormat:@" CREATE TABLE IF NOT EXISTS '%@'('%@' TEXT PRIMARY KEY,'%@' TEXT);",tableName,field1,field2];

   if(sqlite3_exec(db, [sql UTF8String], NULL, NULL, &err) !=SQLITE_OK)
   {
    sqlite3_close(db);
    NSAssert(0, @"Table failed to create");
   }
}

// Inserting records

-(void)insertrecordIntoTable:(NSString*) tableName withField1:(NSString*) field1 field1Value:(NSString*)field1Vaue andField2:(NSString*)field2 field2Value:(NSString*)field2Value
{

  NSString *sqlStr=[NSString stringWithFormat:@"INSERT INTO '%@'('%@','%@')VALUES(?,?)",tableName,field1,field2];
 const char *sql=[sqlStr UTF8String];

 sqlite3_stmt *statement1;

 if(sqlite3_prepare_v2(db, sql, -1, &statement1, nil)==SQLITE_OK)
 {
  sqlite3_bind_text(statement1, 1, [field1Vaue UTF8String], -1, nil);
  sqlite3_bind_text(statement1, 2, [field2Value UTF8String], -1, nil);
 }
 if(sqlite3_step(statement1) !=SQLITE_DONE)
    NSAssert(0, @"Error upadating table");
 sqlite3_finalize(statement1);
}

// Retrieve data from table

-(void)getAllRowsFromTableNamed:(NSString *)tableName
{
  NSString *field1Str,*field2Str;

  NSString *qsql=[NSString stringWithFormat:@"SELECT * FROM %@",tableName];
  sqlite3_stmt *statement;
  if(sqlite3_prepare_v2(db, [qsql UTF8String], -1, &statement, nil)==SQLITE_OK)
  {
   while(sqlite3_step(statement) ==SQLITE_ROW)
   {
     char *field1=(char *) sqlite3_column_text(statement, 0);
     char *field2=(char *) sqlite3_column_text(statement, 1);

     field1Str=[[NSString alloc]initWithUTF8String:field1];
     field2Str=[[NSString alloc] initWithUTF8String:field2];

     NSString *str=[NSString stringWithFormat:@"%@ - %@",field1Str,field2Str];
     NSLog(@"%@",str);
   }
}

}

In viewDidLoad call the methods

- (void)viewDidLoad
{

  [self openDB];
  [self createTableNamed:@"Login" withField1:@"USERNAME" withField2:@"PASSWORD"];
  [self insertrecordIntoTable:@"Login" withField1:@"USERNAME" field1Value:username andField2:@"PASSWORD" field2Value:password];

}

Where username and password are NSString values;