iphone - 选择查询未执行

Question

当我试图执行选择查询不执行。

在下面的代码行的执行程序停止后。

NSString *query = [NSString stringWithFormat:@"select * from maintable_master where din =? ",din];

Answer 1

如果din是整数，

NSString *query = [NSString stringWithFormat:@"select * from maintable_master where din =%d ",din];

如果din是字符串，

NSString *query = [NSString stringWithFormat:@"select * from maintable_master where din ='%@' ",din];