Date before = new Date(); //code to select from database goes here //..... Date after = new Date();if (after - before < 20*60*1000){ //the time to select from database is less than 20 minuters //..... }before是读数据库之前的系统时间,after是读数据库之后的时间 20*60*1000表示20分钟。关于如何查询数据库,建议你看看有关JDBC的书籍。
to Znet() 不行啊,在java代码中不能像那样运算????? 请问怎么写啊?
Date before = new Date(); //code to select from database goes here //..... Date after = new Date();if (after.getTime() - before.getTime() < 20*60*1000){ //the time to select from database is less than 20 minuters //..... }
//code to select from database goes here
//.....
Date after = new Date();if (after - before < 20*60*1000){
//the time to select from database is less than 20 minuters
//.....
}before是读数据库之前的系统时间,after是读数据库之后的时间
20*60*1000表示20分钟。关于如何查询数据库,建议你看看有关JDBC的书籍。
不行啊,在java代码中不能像那样运算?????
请问怎么写啊?
//code to select from database goes here
//.....
Date after = new Date();if (after.getTime() - before.getTime() < 20*60*1000){
//the time to select from database is less than 20 minuters
//.....
}