iphone - NSInteger和int给出异常

Question

我正在尝试使用FMDB从数据库中获取数据，但是经过一段时间的徒劳尝试，我无法弄清楚为什么这会引发EXC_BAD_ACCESS异常。该参数是从NSInteger传入的，但是我既不能记录它，也不能在SELECT语句中使用它。我的代码是:

-(SQLiteResult*) getClient:(bool)forceRefresh id:(NSString*)id forYear:(NSInteger)year {
    SQLiteResult *res;
    if(!forceRefresh){
        NSMutableArray *hereditaments = [[NSMutableArray alloc] init];
        NSLog([NSString stringWithFormat:@"SELECT * FROM Clients WHERE ID = %@ AND Year = %@", id, [NSString stringWithFormat:@"%@", year]]); // exception
        NSLog([NSString stringWithFormat:@"SELECT * FROM Clients WHERE ID = %@ AND Year = %@", id, year]]); // also exception
        FMResultSet *rs = [db executeQuery:[NSString stringWithFormat: @"SELECT * FROM Clients WHERE ID = ? AND Year = %@", year], id]; // also exception
        FMResultSet *rs = [db executeQuery:[NSString stringWithFormat: @"SELECT * FROM Clients WHERE ID = ? AND Year = ?", id, year]]; // also exception

我濒临只是将其作为字符串传递。有没有安全的方法可以只在SQL语句中使用年份？

Answer 1

由于您的year变量为NSInteger类型，因此在创建NSString时应使用％d格式，而不要使用％@