选择查询不执行

Question

当我试图执行选择查询不执行时.

在下面的代码执行程序停止之后.

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

Answer 1

如果din是整数那么,

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

如果din是字符串那么,

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