while（sqlite3_step（statement）== SQLITE_ROW）它没有被执行而没有进入循环？

Question

我正在创建地址簿。它在sqlite中保存组名。但它不起作用。它不进入循环。？请检查我的代码。我的代码中有什么问题？

-(void) selectGroup
{
ssArray = [[NSMutableArray alloc]init];

NSString *selectStmt=[NSString stringWithFormat:@"select GroupName from AddGroup;"];

NSLog(@"the selet statement is :%@",selectStmt);

const char *cSelectStmt=[selectStmt UTF8String];

sqlite3_prepare_v2(database, cSelectStmt, -1, &statement, NULL);

while (sqlite3_step(statement)==SQLITE_ROW) {

    const unsigned char *cName = sqlite3_column_text(statement, 0);

    NSString *name=[NSString stringWithUTF8String:(const char *)cName];

    [self.ssArray addObject:name];
}
sqlite3_finalize(statement);

NSLog(@"Array from database is  :%@",ssArray);
}