iPhone SQLite日期问题

Question

数据库创建得很好,插入工作正常.我遇到下面的select语句有问题.它不返回任何记录,也没有错误.任何其他字段上的选择工作正常.谁能发现我做错了什么？

"create table if not exists data (pkey integer primary key, doc date)"

[db executeUpdate:@"insert into data ( doc) values (?)" , [NSDate date]];

"select * FROM data WHERE doc between '2009-08-23' and '2009-08-23' "

Answer 1

该部分between '2009-08-23' and '2009-08-23'总是错误的,因为缺少更好的描述,这是零时间的范围.

如果您想要在2009-08-23完全发生项目,请选择between '2009-08-23' and '2009-08-24'从23日午夜到24日午夜的项目.

以下是此操作的示例:

sqlite> CREATE TABLE t (d DATETIME);
sqlite> SELECT DATETIME('now');
2009-08-24 02:32:20
sqlite> INSERT INTO t VALUES (datetime('now'));
sqlite> SELECT * FROM t;
2009-08-24 02:33:42
sqlite> SELECT * FROM t where d BETWEEN '2009-08-24' and '2009-08-24';
sqlite> SELECT * FROM t where d BETWEEN '2009-08-24' and '2009-08-25';
2009-08-24 02:33:42