需求:
每天定时清除mongodb中某一天之前的数据
思路:
采用shell脚本调用mongodb的命令执行js脚本即可。
步骤:
1.编写email.js文件,作用:清除mongodb某天之前数据,具体代码如下:
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Date.prototype.format = function(format)
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{
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var o =
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{
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"M+" : this.getMonth()+1, //month
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"d+" : this.getDate(), //day
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"h+" : this.getHours(), //hour
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"m+" : this.getMinutes(), //minute
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"s+" : this.getSeconds(), //second
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"q+" : Math.floor((this.getMonth()+3)/3), //quarter
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"S" : this.getMilliseconds() //millisecond
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}
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if(/(y+)/.test(format))
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format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));
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for(var k in o)
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if(new RegExp("("+ k +")").test(format))
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format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));
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return format;
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}
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function getDay(day){
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var today = new Date();
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var targetday_milliseconds=today.getTime() + 1000*60*60*24*day;
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today.setTime(targetday_milliseconds); //注意,这行是关键代码
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var tYear = today.getFullYear();
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var tMonth = today.getMonth();
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var tDate = today.getDate();
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tMonth = doHandleMonth(tMonth + 1);
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tDate = doHandleMonth(tDate);
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return tYear+"-"+tMonth+"-"+tDate+" 00:00:00";
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}
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function doHandleMonth(month){
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var m = month;
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if(month.toString().length == 1){
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m = "0" + month;
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}
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return m;
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}
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var myDate = new Date();
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var datetime = myDate.format("yyyy-MM-dd 00:00:00");
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var pre7day = getDay(-7);
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print("today="+datetime+"deleteday="+pre7day);
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datetime= new Date(datetime);
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pre7day= new Date(pre7day);
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var count=db.Mail.find({'updateTime':{'$lt':pre7day}}).count();
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print("count="+count);
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db.Mail.remove({'updateTime':{'$lt':pre7day}});
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print('前7天邮件清理完毕...');
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exit
2. 编写shell脚本mongo_clean.sh代码如下:
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#!/bin/bash
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#清空mongodb中的前7天邮件: guoxin.ai@renren-inc.com
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/data/web/mongodb/mongodb-linux-x86_64-2.4.5/bin/mongo 10.3.18.80:27017/mail -quiet /data/web/email.js
3.加入crontab中:
10 0 * * * sh /data/web/agx/mongo_clean.sh
即完成shell操作mongodb执行定时任务,根据任务不同,修改对应的js文件。
参考文章:http://blog.csdn.net/alen1985/article/details/12712111
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