的NSString stringWithFormat事与愿违的结果

Question

我要让SQL SELECT一句话是这样的：

NSLog(@"sql = %@",[NSString stringWithFormat:@"select * from Table1 Where ID = %i AND '%@' = strftime('%Y',startDate)",ID,date]); 

，但它打印对我说：

sql = select * from Table1 Where ID = 1 AND '2012' = strftime('Y',startDate) 

％Y变成Y，我怎么能避免这种情况？

Answer 1

添加另一个%逃离%字符：

NSLog(@"sql = %@",[NSString stringWithFormat:@"select * from Table1 Where ID = %i AND '%@' = strftime('%%Y',startDate)",ID,date]); 

Answer 2

添加％这样NSLog(@"sql = %@",[NSString stringWithFormat:@"select * from Table1 Where ID = %i AND '%@' = strftime('%%Y',startDate)",ID,date]);