Salesforce Schedule定时执行方法

例：每十五分钟执行一次

System.schedule('审批历史15分刷新', '0 15 * * * ?', new ProjectApprovalScheduler());
System.schedule('审批历史30分刷新', '0 30 * * * ?', new ProjectApprovalScheduler());
System.schedule('审批历史45分刷新', '0 45 * * * ?', new ProjectApprovalScheduler());

例：精准到时分

例：每小时，每天执行

System.schedule('每年1月1日运行', '0 0 * 1 1 ?', new QualityGradeAnnualCalculSchedule());
System.schedule('每小时跑一次', '0 0 * * * ?', new QualityGradeAnnualCalculSchedule());

Schedule写法

global with sharing class SchedulerRunSendMessageBatch implements Schedulable
{
    global void execute(SchedulableContext sc)
	{
	    BatchSendMessage bcrbatch = new BatchSendMessage();
         Database.executeBatch(bcrbatch);
	}
}